Researcher basic information

• 博士（工学）, 東京大学

• https://researchmap.jp/tetsuyonezawa?lang=en

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201101021652190522
• https://nanoparticle.hokkaido.university

• 90284538

• 201101021652190522

• フェロセン
• プラズマ
• 複合材料
• クラスター錯体
• 液中プラズマ
• 二酸化チタン
• 遷移金属錯体
• 連続調製
• 多重安定性
• 配列
• ハイドロキシアパタイト
• 組織化
• 薄膜
• 半導体
• 水素結合
• 多重機能
• キラリティー
• 超微粒子
• 表面ゾルゲル法
• マイクロパターニング
• 自己組織化
• ハイドロゲル
• レドックス
• 銀
• 二分子膜
• 錯体
• 自己組織膜
• 光電変換
• 金
• ナノ粒子

• Nanotechnology/Materials, Functional solid state chemistry
• Nanotechnology/Materials, Nanobioscience
• Nanotechnology/Materials, Nanomaterials
• Nanotechnology/Materials, Inorganic/coordination chemistry
• Nanotechnology/Materials, Inorganic materials and properties

• Bachelor's degree program, School of Engineering
• Master's degree program, Graduate School of Engineering
• Doctoral (PhD) degree program, Graduate School of Engineering

Research activity information

• Oct. 2022, 日本化学会コロイドおよび界面化学部会, 第73回コロイドおよび界面化学討論会若手口頭講演賞
  Formation scheme of ZnTe microspheres via hot injection method
  Yuen-ting Rachel Chau, Mai Thanh Nguyen, Tetsu Yonezawa
• Aug. 2022, National Taipei University of Technology, Horonary International Chair Professor
• Jan. 2022, 化学系学協会北海道支部2022年冬季研究発表会, 優秀講演賞（口頭発表部門）
  Cu2O形成を抑制することでネッキング促進されるカルボン酸被覆銅微粒子
  戸倉凜太郎;米澤 徹
• 2016, Royal Society of Chemistry, Fellow
  Tetsu Yonezawa
• Apr. 2015, Pekin University, Xinda Lectureship
  Tetsu Yonezawa
• Oct. 2012, Japanese Society for Analytical Chemistry, Most Cited Paper Award Analytical Sciences 2011
  Tetsu Yonezawa
• Mar. 2009, Japanese Society for Analytical Chemistry, Hot Article Award
  Tetsu Yonezawa

• Anion exchange membranes for electrically rechargeable zinc–air batteries: Structure-transport-degradation relationships and design strategies
  Amogelang G. Metseeme; Thabakgolo T. Letsau; Shidong Song; Tetsu Yonezawa; Phumlani F. Msomi
  Next Materials, Jul. 2026
  Scientific journal
• From Molecule to Stack: A Cross‐Scale Design Framework for Aqueous Organic Redox Flow Batteries
  Phonnapha Tangthuam; Vipada Aupama; Manaswee Suttipong; Tae‐Kyu An; Insik In; Tetsu Yonezawa; Dowon Bae; Li‐Hsien Yeh; Soorathep Kheawhom
  Batteries & Supercaps, May 2026
  Scientific journal
• Universal Interfacial Engineering via Amorphous Inorganic Binders: Passivating Surface States and Accelerating Hole Transfer across Metal Oxide Photoanodes in Photoelectrochemical Water Oxidation
  Po-Keng Hsiao; Yen-Lun Kung; Yun-Pei Liu; Shih-Wen Tseng; Tetsu Yonezawa; Chun-Hu Chen; Ying-Chih Pu
  The Journal of Physical Chemistry Letters, 30 Apr. 2026
  Scientific journal
• Copper Particle Sintering for Low‐Temperature Electronic Joining: A Review of Materials Design and Processing Strategies
  Tetsu Yonezawa; Qianhao Zuo
  Advanced Engineering Materials, 28 Apr. 2026
  Scientific journal
• Low‐Temperature Sintering Copper Inks: In‐Situ X‐Ray Diffraction of Decomposition, Enhanced Conductivity and Morphology, and Nickel‐Improved Weather Resistance
  Yi Zheng; Hiroki Tsukamoto; Tetsu Yonezawa
  ChemNanoMat, Apr. 2026
  Scientific journal
• Shell-Thickness-Dependent Interfacial Charge-Carrier Dynamics and Photocatalytic CO2 Reduction over CdS/UiO-66-NH2 Core/Shell Nanorods
  Kai-An Tsai; Yu-Chen Wei; Yu-Chieh Li; Kai-Chun Chou; Shou-Heng Liu; Jui-Cheng Chang; Chung-Wei Kung; Shih-Wen Tseng; Tetsu Yonezawa; Sheng-Kuei Chiu; Jin Z. Zhang; Ying-Chih Pu
  ACS Applied Nano Materials, 09 Jan. 2026
  Scientific journal
• Stabilisation of lanthanum nickelate electrocatalysts via Pt doping for high-current-density rechargeable zinc–air batteries
  Wei Jian Sim; Mai Thanh Nguyen; Wathanyu Kao-ian; Pinit Kidkhunthod; Te-Wei Chiu; Soorathep Khaewhom; Anongnat Somwangthanaroj; Ying-Chih Pu; Tetsu Yonezawa
  Journal of Materials Chemistry A, 2026
  Scientific journal
• Preparation and Studies of ZnFe2O4–CeO2 Nanopowder via Self Combustion Glycine Nitrate Process for Methanol Steam Reforming Hydrogen Production
  Shu-Han Juang; Chung-Lun Yu; Subramanian Sakthinathan; Tetsu Yonezawa; Ching-Lung Chen; Te-Wei Chiu; Naratip Vittayakorn
  ACS Sustainable Resource Management, 28 Aug. 2025
  Scientific journal
• Spider‐egg‐like structured α‐MnO₂ as an efficient cathode material for aqueous rechargeable zinc‐ion batteries
  Lyn Marie de Juan‐Corpuz; Michael Franco; Wei Jian Sim; Gil Nonato Santos; Tetsu Yonezawa; Ryan D. Corpuz
  Journal of the Chinese Chemical Society, Aug. 2025, [Peer-reviewed]
  Scientific journal
• Solvent-free synthesis of FeCo alloy nanoparticle-embedded nitrogen-doped carbon nanotubes for oxygen reduction in zinc-air batteries
  Mohammad Etesami; Poobodin Mano; Supawadee Namuangruk; Ramin Khezri; Mohan Gopalakrishnan; Wanwisa Limphirat; Tetsu Yonezawa; Shiva Rezaei Motlagh; Anongnat Somwangthanaroj; Soorathep Kheawhom
  International Journal of Hydrogen Energy, Jul. 2025
  Scientific journal
• Highly efficient catalytic activity of MXene Nanosheet supported on CuFeO2 nanoparticles applied on hydrogen evolution
  Zhen-Yuan Lan; Dhanapal Vasu; Yung-Chieh Liu; Chung-Lun Yu; Te-Wei Chiu; Tetsu Yonezawa; Hongbing Jia
  Ceramics International, Jul. 2025, [Peer-reviewed]
  English, Scientific journal
• Prototype of fixtures for pressure sintering using a commercial hot press and die shear test using a small-scale tensile extrusion testing machine
  Tetsu Yonezawa; Hiroki Tsukamoto
  Next Research, Jun. 2025, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• In-situ formation of cathode electrolyte interphase for suppressing manganese dissolution of Ca2Mn3O8 bifunctional OER/ORR catalyst in stable high current-density rechargeable zinc-air batteries
  Hai Pham; Mai Thanh Nguyen; Wei Jian Sim; Te-Wei Chiu; Soorathep Kheawhom; Tetsu Yonezawa
  Applied Surface Science, 688, 162237, Apr. 2025, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Resourceful Hydrogen Generation through Methanol Steam Reforming Using Rare-Earth Metal Oxide-Modified Delafossite 3D Hollow Spheres
  Yung-Chieh Liu; Dhanapal Vasu; Zhen-Yuan Lan; Kuan-Jun Ke; Bo-Han Chen; Wei Jian Sim; Te-Wei Chiu; Liangdong Fan; Tetsu Yonezawa
  Langmuir, 18 Feb. 2025
  Scientific journal
• Ultrasonically Activated Liquid Metal Catalysts in Water for Enhanced Hydrogenation Efficiency
  Nichayanan Manyuan; Naoya Tanimoto; Kousuke Ueda; Ken Yamamoto; Tomoharu Tokunaga; Masaki Nishio; Tetsu Yonezawa; Hideya Kawasaki
  ACS Applied Materials & Interfaces, American Chemical Society (ACS), 17 Jan. 2025, [Peer-reviewed]
  English, Scientific journal
• Hybrid g-C3N4/sulfur-enclosed MnS micro/nanorods accelerate electron-ion transport and asymmetric supercapacitor performance
  Thirumoorthy Kulandaivel; Mohan Gopalakrishnan; Wanwisa Limphirat; Chanon Pornrungroj; Wei-Ren Liu; Ahmad Azmin Mohamad; Mai Thanh Nguyen; Tetsu Yonezawa; Soorathep Kheawhom
  Journal of Alloys and Compounds, 1010, 178268, 178268, Elsevier BV, Jan. 2025, [Peer-reviewed]
  English, Scientific journal
• Tunable N-doped carbon dots/SnO2 interface as a stable artificial solid electrolyte interphase for high-performance aqueous zinc-ion batteries
  Mohan Gopalakrishnan; Myo Thandar Hlaing; Thirumoorthy Kulandaivel; Wathanyu Kao-ian; Mohammad Etesami; Wei-Ren Liu; Mai Thanh Nguyen; Tetsu Yonezawa; Wanwisa Limphirat; Soorathep Kheawhom
  Journal of Alloys and Compounds, 1013, 178521, 178521, Elsevier BV, Jan. 2025, [Peer-reviewed]
  English, Scientific journal
• Review: Copper Fine Particle/Nanoparticle-Based Sintering Joining Material
  Kazuki Tamura; Masaki Nishio; Mai Thanh Nguyen; Tetsu Yonezawa
  Journal of the Japan Institute of Metals and Materials, 88, 11, 270, 280, Japan Institute of Metals, 01 Nov. 2024, [Last author, Corresponding author]
  Japanese, Scientific journal
• Eco-friendly synthesis and application of NH2-COOH functionalized Fe3O4@graphite carbon microballs in heavy metal removal
  Thirumoorthy Kulandaivel; Mohan Gopalakrishnan; Sunantha Ganesan; Ahmad Azmin Mohamad; Kasidit Nootong; Mai Thanh Nguyen; Tetsu Yonezawa; Soorathep Kheawhom
  Journal of Environmental Chemical Engineering, 12, 5, 113724, 113724, Elsevier BV, Oct. 2024
  Scientific journal
• Unraveling the Electrocatalytic Activity in HMF Oxidation to FDCA by Fine‐Tuning the Degree of NiOOH Phase Over Ni Nanoparticles Supported on Graphene Oxide
  Sorasak Klinyod; Nuttapon Yodsin; Mai Thanh Nguyen; Zikkawas Pasom; Sunpet Assavapanumat; Marisa Ketkaew; Pinit Kidkhunthod; Tetsu Yonezawa; Supawadee Namuangruk; Chularat Wattanakit
  Small, 20, 27, Wiley, 28 Mar. 2024
  Scientific journal, Abstract
  
  The development of an efficient electrocatalyst for HMF oxidation to FDCA has been in the early stages. Herein, the NiNPs/GO‐Ni‐foam is fabricated as an electrocatalyst for FDCA production. However, the electrocatalytic performance of the untreated NiNPs/GO‐Ni‐foam is observed with moderate Faradaic efficiency (FE) (73.0%) and FDCA yield (80.2%). By electrochemically treating the NiNPs/GO‐Ni‐foam in an alkaline solution with positive potential at different treatment durations, the degree of NiOOH on metal surfaces is changed. The distinctive electrocatalytic activity obtained when using the different NiOOH degrees allows to understand the crucial impact of NiOOH species in HMF electrooxidation. Enhancing the portion of the NiOOH phase on the electrocatalyst surface improves electrocatalytic activity in terms of FE and FDCA yield up to 94.8±4.8% and 86.9±4.1%, respectively. Interestingly, as long as the NiOOH portion on the electrocatalyst surface is preserved or regenerated, the electrocatalyst performance can be intact even after several catalytic cycles. The theoretical study via density functional theory (DFT) also agrees with the experimental observations and confirms that the NiOOH phase facilitates the electrochemical transformation of HMF to FDCA through the HMFCA pathway, and the potential limiting step of the overall reaction is the oxidation of FFCA to FDCA.
• 3D Hierarchical MOF-Derived Defect-Rich NiFe Spinel Ferrite as a Highly Efficient Electrocatalyst for Oxygen Redox Reactions in Zinc–Air Batteries
  Mohan Gopalakrishnan; Wathanyu Kao-ian; Meena Rittiruam; Supareak Praserthdam; Piyasan Praserthdam; Wanwisa Limphirat; Mai Thanh Nguyen; Tetsu Yonezawa; Soorathep Kheawhom
  ACS Applied Materials & Interfaces, 16, 9, 11537, 11551, 06 Mar. 2024, [Peer-reviewed]
  English, Scientific journal
• Innovative pH-buffering strategies for enhanced cycling stability in zinc–iodine flow batteries
  Phonnapha Tangthuam; Suttipong Wannapaiboon; Pinit Kidkhunthod; Jeng-Lung Chen; Chia-Che Chang; Chih Wen Pao; Phitchapa Ausamanwet Zijdemans; Tetsu Yonezawa; Manaswee Suttipong; Soorathep Kheawhom
  Journal of Materials Chemistry A, 2024
  Scientific journal
• In situ self-assembly of molybdenum carbide and iron carbide heterostructures on N-doped carbon for an efficient oxygen reduction reaction
  Sagar Ingavale; Mohan Gopalakrishnan; Phiralang Marbaniang; Woranunt Lao-atiman; Ahmad Azmin Mohamad; Mai Thanh Nguyen; Tetsu Yonezawa; Anita Swami; Soorathep Kheawhom
  Nanoscale, 2024
  Scientific journal
• Detailed discussion on the structure of alloy nanoparticles synthesized via magnetron sputter deposition onto liquid poly(ethylene glycol)
  Mai Thanh Nguyen; Pichaya Pattanasattayavong; Tetsu Yonezawa
  Nanoscale Advances, 2024
  Scientific journal
• Mitigating water-related challenges in aqueous zinc-ion batteries through ether-water hybrid electrolytes
  Shiva Rezaei Motlagh; Ramin Khezri; Mohammad Etesami; Ahmad Azmin Mohamad; Pinit Kidkhunthod; Muhamad Kamil Yaakob; Manaswee Suttipong; Mai Thanh Nguyen; Tetsu Yonezawa; Kasidit Nootong; Soorathep Kheawhom
  Electrochimica Acta, 468, 143122, Nov. 2023, [Peer-reviewed]
  Scientific journal
• Noble-Metal Free Zinc-Air Battery Catalysts
  Wei Jian Sim; Mai Thanh Nguyen; Tetsu Yonezawa
  MATERIALS TRANSACTIONS, 64, 10, 2394, 2399, Japan Institute of Metals, 01 Oct. 2023
  Scientific journal
• High‐Temperature Air Synthesis: A Facile Approach to Nitrogen‐Doped, Metal‐Free Carbon Electrocatalysts
  Mohammad Etesami; Ramin Khezri; Shiva Rezaei Motlagh; Mohan Gopalakrishnan; Mai Thanh Nguyen; Tetsu Yonezawa; Suttipong Wannapaiboon; Kasidit Nootong; Anongnat Somwangthanaroj; Soorathep Kheawhom
  ChemCatChem, 15, 18, Wiley, 25 Jul. 2023
  Scientific journal, Abstract
  
  This study presents a novel, straightforward method for synthesizing hierarchical nitrogen‐doped carbon structures, positioning metal‐free, carbon‐based materials as potential substitutes in electrochemical reactions such as oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER). The unique method involves a single‐step pyrolysis process in an air atmosphere, eliminating the need for an inert atmosphere and pre‐treatment procedures. It enables simultaneous self‐templating and heteroatom doping, resulting in oxygen‐rich functional groups embedded in the nitrogen‐doped carbon structure. We also crafted a carbon structure without heteroatom doping, comparing its electrochemical performance in ORR and HER. Our findings indicate that carbon catalysts pyrolyzed at higher temperatures have more pyridinic N, functional groups, and active sites‐ factors conducive to electrochemical reactions. We tested the air‐synthesized electrocatalysts for ORR in alkaline electrolyte and employed the optimized nitrogen‐doped carbon catalyst, pyrolyzed at 700 °C in an air atmosphere, as cathode material in a zinc‐air battery. This catalyst demonstrated ORR performance comparable to the commercial Pt/C catalyst and showed minimal overpotential in acidic HER. Our research establishes a pioneering technique for synthesizing porous, metal‐free, nitrogen‐doped carbon materials, paving the way for potential energy applications.
• Unexpected Reactivity of Cationic-to-Cationic Thiolate Ligand-Exchange Reaction on Au25 Clusters
  Donghoon Lee; Yohei Ishida; Tetsu Yonezawa
  Langmuir, 20 Jun. 2023
  Scientific journal
• Carbon Nanotubes Deposited on Mordenite Zeolite/NiAl-Layered Double Hydroxide Composites as Electrocatalysts for 2,5-Furandicarboxylic Acid Production from 5-Hydroxymethylfurfural
  Supakorn Tantisriyanurak; Sorasak Klinyod; Wanwipa Leangsiri; Watinee Nunthakitgoson; Asadawut Soyphet; Marisa Ketkaew; Anawat Thivasasith; Ploychanok Iadrat; Chadatip Rodaum; Thassanant Atithep; Mai Thanh Nguyen; Tetsu Yonezawa; Chularat Wattanakit
  ACS Applied Nano Materials, 6, 10, 8784, 8794, American Chemical Society (ACS), 12 May 2023
  Scientific journal
• Unveiling the role of water in enhancing the performance of zinc-ion batteries using dimethyl sulfoxide electrolyte and the manganese dioxide cathode
  Wathanyu Kao-ian; Jinnawat Sangsawang; Pinit Kidkhunthod; Suttipong Wannapaiboon; Manaswee Suttipong; Amornrat Khampunbut; Prasit Pattananuwat; Mai Thanh Nguyen; Tetsu Yonezawa; Soorathep Kheawhom
  Journal of Materials Chemistry A, 11, 20, 10584, 10595, 20 Apr. 2023, [Peer-reviewed]
  English, Scientific journal
• Synthesis of cyclodextrin-stabilized gold nanoparticles supported hierarchical zeolites for the facile production of furandicarboxylic acid (FDCA) from 5-hydroxymethylfurfural (HMF)
  Supattra Somsri; Anittha Prasertsab; Peerapol Pornsetmetakul; Narasiri Maineawklang; Mai Thanh Nguyen; Tetsu Yonezawa; Chularat Wattanakit
  Microporous and Mesoporous Materials, 354, 112559, Apr. 2023, [Peer-reviewed]
  Scientific journal
• Mechanistic consideration of ZnTe microspheres formation in a PVP-contained polyol system via hot injection method
  Yuen-ting Rachel Chau; Mai Thanh Nguyen; Tomoharu Tokunaga; Tetsu Yonezawa
  Advanced Powder Technology, 34, 4, 103970, 103970, Elsevier BV, Apr. 2023, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Critical roles of metal–organic frameworks in improving the Zn anode in aqueous zinc-ion batteries
  Mohan Gopalakrishnan; Sunantha Ganesan; Mai Thanh Nguyen; Tetsu Yonezawa; Supareak Praserthdam; Rojana Pornprasertsuk; Soorathep Kheawhom
  Chemical Engineering Journal, Feb. 2023, [Peer-reviewed]
  English, Scientific journal
• Enhancing electrochemical performance and stabilizing zinc anode in mild acidic electrolyte using combined additive
  Shiva Rezaei Motlagh; Ramin Khezri; Ahmad Azmin Mohamad; Rojana Pornprasertsuk; Pinit Kidkhunthod; Mai Thanh Nguyen; Tetsu Yonezawa; Soorathep Kheawhom
  Materials Science for Energy Technologies, 6, 178, 191, Elsevier BV, 2023
  Scientific journal
• Carboxymethyl cellulose as an artificial solid electrolyte interphase for stable zinc-based anodes in aqueous electrolytes
  Phonapha Tangthuam; Wathanyu Kao-ian; Jinnawat Sangsawang; Catleya Rojviriya; Prae Chirawatkul; Jitti Kasemchainan; Falko Mahlendorf; Mai Thanh Nguyen; Tetsu Yonezawa; Soorathep Kheawhom
  Materials Science for Energy Technologies, 6, 417, 428, Elsevier BV, 2023
  Scientific journal
• Sputter-Deposited Binder-Free Nanopyramidal Cr/γ-Mo2N TFEs for High-Performance Supercapacitors
  Durai Govindarajan; Nithyadharseni Palaniyandy; Karthik Kumar Chinnakutti; Mai Thanh Nguyen; Tetsu Yonezawa; Jiaqian Qin; Soorathep Kheawhom
  Nanoscale Research Letters, 17, 1, Springer Science and Business Media LLC, Dec. 2022, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, Due to their outstanding power density, long cycle life and low cost, supercapacitors have gained much interest. As for supercapacitor electrodes, molybdenum nitrides show promising potential. Molybdenum nitrides, however, are mainly prepared as nanopowders via a chemical route and require binders for the manufacture of electrodes. Such electrodes can impair the performance of supercapacitors. Herein, binder-free chromium (Cr)-doped molybdenum nitride (Mo₂N) TFEs having different Cr concentrations are prepared via a reactive co-sputtering technique. The Cr-doped Mo₂N films prepared have a cubic phase structure of γ-Mo₂N with a minor shift in the (111) plane. While un-doped Mo₂N films exhibit a spherical morphology, Cr-doped Mo₂N films demonstrate a clear pyramid-like surface morphology. The developed Cr-doped Mo₂N films contain 0–7.9 at.% of Cr in Mo₂N lattice. A supercapacitor using a Cr-doped Mo₂N electrode having the highest concentration of Cr reveals maximum areal capacity of 2780 mC/cm², which is much higher than that of an un-doped Mo₂N electrode (110 mC/cm²). Furthermore, the Cr-doped Mo₂N electrode demonstrates excellent cycling stability, achieving ~ 94.6% capacity retention for about 2000 cycles. The reactive co-sputtering proves to be a suitable technique for fabrication of binder-free TFEs for high-performance energy storage device applications.
  
  Graphical Abstract
• Spatio-temporal control of THz emission
  Hsin-hui Huang; Saulius Juodkazis; Eugene G. Gamaly; Takeshi Nagashima; Tetsu Yonezawa; Koji Hatanaka
  Communications Physics, 5, 1, Springer Science and Business Media LLC, Dec. 2022, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, Abstract
  
  Intense THz sources are expected for further progresses in nonlinear THz science and technology. Liquids like water are durable and continuously-reusable under intense laser irradiation for THz emission though such studies on THz emission from water targets are so far limited. Polarisation fine control of THz emission is demonstrated with a tilted micro-thin water flow by the irradiation of two cross-linearly-polarised femtosecond laser pulses (800nm, 35fs, transform-limited) with spatio-temporal offsets. With an optimized horizontal offset at ∼11 μm between the ∼8 μm focal spots and time delay at 4.7ns, circularly-polarised THz emission is obtained with its intensity enhancement more than 1,500-times if compared with the single pulse irradiation. It is shown that the photon-number-based efficiency from the laser to THz at 7.1 x 10⁻³ is achieved with the optimisation of the double pulse irradiation. Polarisation-resolved THz time-domain spectroscopy and time-resolved shadowgraphy imaging reveal that the circularly-polarised THz emission originates from the focal volume in front of the water flow. Coupling between a shockwave due to air-breakdown and water ablation-mediated mass transport by the pre-pulse with a laser wake-field along the optical path of the main pulse is responsible for the point-like single-cycle THz emission.
• Injectable Fiducial Marker for Image-Guided Radiation Therapy Based on Gold Nanoparticles and a Body Temperature-Activated Gel-Forming System
  Haoran Liu; Naoki Miyamoto; Mai Thanh Nguyen; Hiroki Shirato; Tetsu Yonezawa
  ACS Applied Bio Materials, 17 Oct. 2022, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
  Scientific journal
• 3D carbon nanotubes-graphene hybrids for energy conversion and storage applications
  Mohammad Etesami; Mai Thanh Nguyen; Tetsu Yonezawa; Adisorn Tuantranont; Anongnat Somwangthanaroj; Soorathep Kheawhom
  Chemical Engineering Journal, 446, 137190, 137190, Elsevier BV, Oct. 2022
  Scientific journal
• Mixed-Metal-Atom Markers Enable Simultaneous Imaging of Spatial Distribution in Two-Dimensional Heterogeneous Molecular Assembly by Scanning Transmission Electron Microscopy
  Ikumi Akita; Yohei Ishida; Tetsu Yonezawa
  ACS Measurement Science Au, American Chemical Society (ACS), 03 Aug. 2022, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Atomic-scale observation by aberration-corrected scanning transmission electron microscopy (STEM) is essential for characterizing supramolecular assemblies with nonperiodic structures. Identifying the relative spatial arrangement in a mixture of molecular species in an assembly is crucial for understanding chemical reaction systems occurring in the assembly. Herein, we report the first direct observation of supramolecular assemblies comprising anionic clay mineral nanosheets and two types of cationic porphyrin complexes with Pt and Pd atom markers by annular dark-field STEM, enabling the simultaneous imaging of well-mixed spatial molecular distributions. The results expand the possibility of applying electron microscopy to self-assembly structures constructed via weak supramolecular interactions on relatively thick nanosheet materials and on one- to few-atom-thick graphene analogues, which will provide important guidelines for future material design.
• Copper Materials for Low Temperature Sintering
  Masamu Nishimoto; Rintaro Tokura; Mai Thanh Nguyen; Tetsu Yonezawa
  MATERIALS TRANSACTIONS, 63, 5, 663, 675, Japan Institute of Metals, 01 May 2022
  Scientific journal
• Green and effective synthesis of gold nanoparticles as an injectable fiducial marker for real-time image gated proton therapy
  Haoran Liu; Naoki Miyamoto; Mai Thanh Nguyen; Hiroki Shirato; Tetsu Yonezawa
  Materials Advances, 3, 13, 5430, 5441, Royal Society of Chemistry ({RSC}), May 2022, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Fiducial markers are crucial for reducing damage to surrounding healthy tissues in real-time image gated proton therapy (RGPT) by boosting geometric accuracy and precision. This study aims to develop an injectable fiducial marker based on gold nanoparticles (Au NPs) synthesized by a green ethanol reduction method, as well as to determine the factors that affect their injectability and imaging capability. Au NPs synthesized in the ethanol-only system had an improved injectability (through 18G and 21G needles) and their imaging performance was almost identical to current fiducial markers used in the clinic. The reducing capacity of the ethanol system was significantly enhanced through the introduction of sodium alginate. Meanwhile, the addition of sodium alginate could also control the size of Au NPs, ranging from 21.8 to 14.1 nm. The product alg-Au NPs with smaller sizes enabled an injectability up to 100% even through 25G needles with an extrusion force less than 17 N, which is superior for the injection of high-concentration Au NPs. A better imaging performance of alg-Au NPs was also verified in the X-ray visualization test. The work describes the green synthesis of Au NPs via the high-efficiency reducing system ethanol/alginate without the use of toxic reducing, capping, or stabilizing agents. The alg-Au NPs were found to exhibit promise as a fiducial marker for RGPT based on the injectability and imaging test
• Preparation of Biopex-Supported Gold Nanoparticles as Potential Fiducial Markers for Image-Guided Radiation Therapy
  Kai Ikeda; Haoran Liu; Naoki Miyamoto; Mai Thanh Nguyen; Hiroki Shirato, Tetsu Yonezawa
  ACS Applied Bio Materials, 5, 3, 1259, 1266, American Chemical Society ({ACS}), 21 Mar. 2022, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Image-guided radiation therapy (IGRT) has emerged as a promising technique for cancer treatment to improve radiation precision and accuracy, thereby reducing the treatment toxicity and optimizing therapeutic efficacy. In IGRT, fiducial markers are required to be inserted near the tumor to get the spatial information of the tumor. Currently used metal fiducial markers with large sizes would be highly invasive; therefore, it is critical to develop minimally invasive alternatives to these markers. In this work, an injectable marker based on Biopex-supported Au NPs with adequate radio-opacity for X-ray visualization was developed. Biopex can function as a substrate for the growth of Au NPs and avoid excessive reaction-induced aggregation and precipitation. The self-curing property of Biopex prevents the leakage and elimination of isolated Au NPs, enabling long-term X-ray observation and radiotherapy. The effect of Biopex amount, gold precursor concentration, and reaction time were evaluated. The visibility of samples prepared by the optimized formula was also examined. The developed Biopex-Au NPs could be injected through a 21 G needle and exhibit great visibility in the X-ray visualization test, showing great potential as a fiducial marker for image-guided radiation therapy.
• Anisotropic Growth of Copper Nanorods Mediated by Cl– Ions
  Min Jia Saw; Mai Thanh Nguyen; Yuji Kunisada; Tomoharu Tokunaga; Tetsu Yonezawa
  ACS Omega, 7, 8, 7414, 7420, American Chemical Society ({ACS}), 01 Mar. 2022, [Peer-reviewed], [Last author, Corresponding author]
  Scientific journal
• Recent advances in oxygen electrocatalysts based on tunable structural polymers
  M. Gopalakrishnan; A.A. Mohamad; M.T. Nguyen; T. Yonezawa; J. Qin; P. Thamyongkit; A. Somwangthanaroj; S. Kheawhom
  Materials Today Chemistry, 23, 100632, 100632, Elsevier {BV}, Mar. 2022, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal, Due to their high energy density, great safety and eco-friendliness, zinc-air batteries (ZABs) attract much attention. During the process of charging and discharging, the two key processes viz. oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) limit their efficiency. In general, the noble metal-based electrocatalysts (ORR: platinum (Pt); OER: iridium (IV) oxide [IrO2] and ruthenium oxide [RuO2]) have long been used. Nonetheless, these noble metal electrocatalysts also have their limitations owing to high cost and poor stability. As alternatives, polymers are found to be most promising on account of their tunable structure, uniform network, high surface morphology and strong durability. Polymers are capable catalysts. In this review, recent advances as well as insight into the architecture of covalent organic polymers (COPs), metal coordination polymers (MCPs) and pyrolysis-free polymers (PFPs) are duly outlined.
• Alginate-Stabilized Gold Nanoparticles Prepared Using the Microwave-Induced Plasma-in-Liquid Process with Long-Term Storage Stability for Potential Biomedical Applications
  Haoran Liu; Kai Ikeda; Mai Thanh Nguyen; Susumu Sato; Naoki Matsuda; Hiroki Tsukamoto; Tomoharu Tokunaga; Tetsu Yonezawa
  ACS Omega, American Chemical Society ({ACS}), 22 Feb. 2022, [Peer-reviewed], [Last author, Corresponding author]
  Scientific journal
• Tailoring the MOF structure via ligand optimization afforded a dandelion flower like CoS/Co–Nx/CoNi/NiS catalyst to enhance the ORR/OER in zinc–air batteries
  Mohan Gopalakrishnan; Mohamad Etesami; Jayaraman Theerthagiri; Myong Yong Choi; Suttipong Wannapaiboon; Mai Thanh Nguyen; Tetsu Yonezawa; Soorathep Kheawhom
  Nanoscale, 2022, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Co-sputtered CuPt/Ag alloy nanoparticles and comparative catalytic performance of mono-, bi-, and tri-metallic nanoparticles in the oxygen reduction reaction
  Mingbei Zhu; Mai Thanh Nguyen; Wei Jian Sim; Tetsu Yonezawa
  Materials Advances, 2022, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
  Scientific journal
• CoxNi1−xO-NiCo2O4/rGO synergistic bifunctional electrocatalysts for high-rate rechargeable zinc–air batteries
  Zixuan Huang; Mai Thanh Nguyen; Wei Jian Sim; Masayuki Takahashi; Soorathep Kheawhom; Tetsu Yonezawa
  Sustainable Energy & Fuels, Royal Society of Chemistry ({RSC}), 2022, [Peer-reviewed], [Last author, Corresponding author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• A liquid metal catalyst for the conversion of ethanol into graphitic carbon layers under an ultrasonic cavitation field
  Hideya Kawasaki; Tomoko Otsuki; Fumiya Sugino; Ken Yamamoto; Tomoharu Tokunaga; Rintaro Tokura; Tetsu Yonezawa
  Chemical Communications, Royal Society of Chemistry ({RSC}), 2022, [Last author, Corresponding author]
  Scientific journal
• Efficient iron–cobalt oxide bifunctional electrode catalysts in rechargeable high current density zinc–air batteries
  Wei Jian Sim; Mai Thanh Nguyen; Zixuan Huang; Soorathep Kheawhom; Chularat Wattanakit; Tetsu Yonezawa
  Nanoscale, Royal Society of Chemistry ({RSC}), 2022, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• The role of surface oxides and stabilising carboxylic acids of copper nanoparticles during low-temperature sintering
  Rintaro Tokura; Hiroki Tsukamoto; Tomoharu Tokunaga; Mai Thanh Nguyen; Tetsu Yonezawa
  Materials Advances, Royal Society of Chemistry (RSC), 2022, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal, 1-Hexanoic acid stabilised copper nanoparticles were obtained. Cu₆₄O phase could be found on the particle surface. During sintering, the stabilising molecule, 1-hexanoic acid, reduced Cu₆₄O to Cu and it introduced neckings between the particles.
• Control of nanoparticles synthesized via vacuum sputter deposition onto liquids: a review
  Mai Thanh Nguyen; Lianlian Deng; Tetsu Yonezawa
  Soft Matter, Royal Society of Chemistry ({RSC}), 2022, [Peer-reviewed], [Invited], [Last author, Corresponding author]
  English, Scientific journal, Sputter deposition onto a low volatile liquid matrix is a recently developed green synthesis method of metal/metal oxide nanoparticles (NPs). In this review, we introduce the synthesis method and highlight...
• Benchmarking superfast electrodeposited bimetallic (Ni, Fe, Co, and Cu) hydroxides for oxygen evolution reaction
  Mohammad Etesami; Ahmad Azmin Mohamad; Mai Thanh Nguyen; Tetsu Yonezawa; Rojana Pornprasertsuk; Anongnat Somwangthanaroj; Soorathep Kheawhom
  Journal of Alloys and Compounds, 889, 161738, 161738, Elsevier BV, Jan. 2022, [Peer-reviewed]
  English, Scientific journal
• Surface Menshutkin SN2 Reaction on Basic Gold Clusters Provides Novel Opportunities for the Cationization and Functionalization of Molecular Metal Clusters
  Kunihiro Narita; Yohei Ishida; Shuichi Nukui; Zhong Huang; Tetsu Yonezawa
  The Journal of Physical Chemistry Letters, 12, 49, 11761, 11765, American Chemical Society ({ACS}), 16 Dec. 2021, [Peer-reviewed], [Last author, Corresponding author], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• A durable rechargeable zinc-air battery via self-supported MnOx-S air electrode
  Nikdalila Radenahmad; Ramin Khezri; Ahmad Azmin Mohamad; Mai Thanh Nguyen; Tetsu Yonezawa; Anongnat Somwangthanaroj; Soorathep Kheawhom
  Journal of Alloys and Compounds, 883, 160935, 160935, Elsevier BV, Nov. 2021, [Peer-reviewed]
  English, Scientific journal
• Highly stable rechargeable zinc-ion battery using dimethyl sulfoxide electrolyte
  W. Kao-ian; M.T. Nguyen; T. Yonezawa; R. Pornprasertsuk; J. Qin; S. Siwamogsatham; S. Kheawhom
  Materials Today Energy, 21, 100738, 100738, Elsevier {BV}, Sep. 2021, [Peer-reviewed]
  Scientific journal
• Impact of Binder Functional Groups on Controlling Chemical Reactions to Improve Stability of Rechargeable Zinc-Ion Batteries
  Natta Jaikrajang; Wathanyu Kao-Ian; Tatsuki Muramatsu; Rungroj Chanajaree; Tetsu Yonezawa; Zakaria Y. Al Balushi; Soorathep Kheawhom; Rongrong Cheacharoen
  ACS Applied Energy Materials, 4, 7, 7138, 7147, American Chemical Society ({ACS}), 26 Jul. 2021, [Peer-reviewed]
  English, Scientific journal
• Pt/Ag Solid Solution Alloy Nanoparticles in Miscibility Gaps Synthesized by Cosputtering onto Liquid Polymers
  Mingbei Zhu; Mai Thanh Nguyen; Yuen-ting Rachel Chau; Lianlian Deng; Tetsu Yonezawa
  Langmuir, 37, 19, 6096, 6105, 18 May 2021, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Direct Imaging of Individual Organic Molecules in Supramolecular Assembly Strongly Fixed via Multivalent Electrostatic Interactions
  Ikumi Akita; Yohei Ishida; Tetsu Yonezawa
  The Journal of Physical Chemistry C, 125, 8, 4917, 4923, American Chemical Society ({ACS}), 04 Mar. 2021, [Peer-reviewed], [Last author, Corresponding author]
  Scientific journal
• CHAPTER 15: Miscellaneous Reductants
  Tetsu Yonezawa; Shilei Zhu; Mai Thanh Nguyen
  RSC Nanoscience and Nanotechnology, 2021-, 50, 393, 459, Royal Society of Chemistry, 2021
  English, In book
• Micro- and nano-encapsulated metal and alloy-based phase-change materials for thermal energy storage
  Shilei Zhu; Mai Thanh Nguyen; Tetsu Yonezawa
  Nanoscale Advances, 3, 16, 4626, 4645, 2021, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• THz wave emission from the Cu2O/Cu interface under femtosecond laser irradiation
  Yuen-Ting Rachel Chau; Hsin-hui Huang; Mai Thanh Nguyen; Koji Hatanaka; Tetsu Yonezawa
  Applied Physics Express, 14, 1, 012006, 012006, {IOP} Publishing, 01 Jan. 2021, [Peer-reviewed], [Last author, Corresponding author], ［Internationally co-authored］, [International Magazine]
  Scientific journal, Cu or Cu/Au (80 nm thick Cu, 50 nm thick Au) sputtered on Si were kept at 25 °C for a week or annealed at a temperature from 80 to 300 °C, then tested for THz emission under femtosecond laser irradiation (35 fs-800 nm). THz radiation was detected from samples annealed from 80 to 170 °C, which had a Cu₂O/Cu interface as the THz source. Cu/Au/Si annealed at 80 °C emitted the highest THz radiation because of high laser absorption by the porous Cu₂O layer formed at low temperature and the Au film reflected THz radiation and/or increased the laser absorption by the Fabry–Pérot effect.
• Synergistic Effect of the Oleic Acid and Oleylamine Mixed-Liquid Matrix on Particle Size and Stability of Sputtered Metal Nanoparticles
  Mai Thanh Nguyen; Krittaporn Wongrujipairoj; Hiroki Tsukamoto; Soorathep Kheawhom; Shuang Mei; Vipada Aupama; Tetsu Yonezawa
  ACS Sustainable Chemistry & Engineering, 8, 49, 18167, 18176, American Chemical Society ({ACS}), 14 Dec. 2020, [Peer-reviewed], [Last author, Corresponding author]
  Scientific journal
• Surfactant-stabilized copper paticles for low-temperature sintering: Paste preparation using a milling with small zirconia beads: Effect of pre-treatment with the disperse medium
  Shuai Liu; Rintaro Tokura; Mai Thanh Nguyen; Hiroki Tsukamoto; Tetsu Yonezawa
  Advanced Powder Technology, 31, 11, 4570, 4575, Elsevier {BV}, Nov. 2020, [Peer-reviewed], [Last author, Corresponding author]
  Scientific journal
• Enhanced Cycling Performance of Rechargeable Zinc–Air Flow Batteries Using Potassium Persulfate as Electrolyte Additive
  Ramin Khezri; Soraya Hosseini; Abhishek Lahiri; Shiva Rezaei Motlagh; Mai Thanh Nguyen; Tetsu Yonezawa; Soorathep Kheawhom
  International Journal of Molecular Sciences, 21, 19, 7303, 7303, {MDPI} {AG}, Oct. 2020, [Peer-reviewed]
  Scientific journal, Zinc–air batteries (ZABs) offer high specific energy and low-cost production. However, rechargeable ZABs suffer from a limited cycle life. This paper reports that potassium persulfate (KPS) additive in an alkaline electrolyte can effectively enhance the performance and electrochemical characteristics of rechargeable zinc–air flow batteries (ZAFBs). Introducing redox additives into electrolytes is an effective approach to promote battery performance. With the addition of 450 ppm KPS, remarkable improvement in anodic currents corresponding to zinc (Zn) dissolution and limited passivation of the Zn surface is observed, thus indicating its strong effect on the redox reaction of Zn. Besides, the addition of 450 ppm KPS reduces the corrosion rate of Zn, enhances surface reactions and decreases the solution resistance. However, excess KPS (900 and 1350 ppm) has a negative effect on rechargeable ZAFBs, which leads to a shorter cycle life and poor cyclability. The rechargeable ZAFB, using 450 ppm KPS, exhibits a highly stable charge/discharge voltage for 800 cycles. Overall, KPS demonstrates great promise for the enhancement of the charge/discharge performance of rechargeable ZABs.
• Circularly-polarized THz wave emission from a micro-thin water flow
  Hsin-Hui Huang; Saulius Juodkazis; Eugene Gamaly; Takeshi Nagashima; Tetsu Yonezawa; Koji Hatanaka
  Research Square Platform {LLC}, 23 Sep. 2020, [Peer-reviewed]
  Scientific journal
• Ethylene Glycol/Ethanol Anolyte for High Capacity Alkaline Aluminum-Air Battery With Dual-Electrolyte Configuration
  Tanawat Phusittananan; Wathanyu Kao-Ian; Mai Thanh Nguyen; Tetsu Yonezawa; Rojana Pornprasertsuk; Ahmad Azmin Mohamad; Soorathep Kheawhom
  Frontiers in Energy Research, 8, Frontiers Media SA, 31 Jul. 2020, [Peer-reviewed]
  English, Scientific journal
• MnO2 Heterostructure on Carbon Nanotubes as Cathode Material for Aqueous Zinc-Ion Batteries
  Sonti Khamsanga; Mai Thanh Nguyen; Tetsu Yonezawa; Patchanita Thamyongkit; Rojana Pornprasertsuk; Prasit Pattananuwat; Adisorn Tuantranont; Siwaruk Siwamogsatham; Soorathep Kheawhom
  International Journal of Molecular Sciences, 21, 13, 4689, 4689, {MDPI} {AG}, 30 Jun. 2020, [Peer-reviewed]
  English, Scientific journal
• THz Wave Emission from ZnTe Nano-colloidal Aqueous Dispersion Irradiated by Femtosecond Laser
  Hsin-hui Huang; Yuen-ting Rachel Chau; Tetsu Yonezawa; Mai Thanh Nguyen; Shilei Zhu; Dan Deng; Takeshi Nagashima; Koji Hatanaka
  Chemistry Letters, 49, 6, 597, 600, The Chemical Society of Japan, 05 Jun. 2020, [Peer-reviewed], [Corresponding author]
  English, Scientific journal
• Atomic-Scale Imaging of a Free-Standing Monolayer Clay Mineral Nanosheet Using Scanning Transmission Electron Microscopy
  Ikumi Akita; Yohei Ishida; Tetsu Yonezawa
  The Journal of Physical Chemistry Letters, 11, 9, 3357, 3361, American Chemical Society ({ACS}), 07 May 2020, [Peer-reviewed], [Last author, Corresponding author]
  Scientific journal
• High-Capacity Dual-Electrolyte Aluminum–Air Battery with Circulating Methanol Anolyte
  Pemika Teabnamang; Wathanyu Kao-ian; Mai Thanh Nguyen; Tetsu Yonezawa; Rongrong Cheacharoen; Soorathep Kheawhom
  Energies, 05 May 2020, [Peer-reviewed]
  Scientific journal
• Binder-Free α-MnO2 Nanowires on Carbon Cloth as Cathode Material for Zinc-Ion Batteries
  Ryan Dula Corpuz; Lyn Marie De Juan-Corpuz; Mai Thanh Nguyen; Tetsu Yonezawa; Heng-Liang Wu; Anongnat Somwangthanaroj; Soorathep Kheawhom
  International Journal of Molecular Sciences, 21, 9, 3113, 3113, {MDPI} {AG}, 28 Apr. 2020, [Peer-reviewed]
  Scientific journal
• Synthesis of Au@Cu2O Core–Shell Nanoparticles with Tunable Shell Thickness and Their Degradation Mechanism in Aqueous Solutions
  Shilei Zhu; Dan Deng; Mai Thanh Nguyen; Yuen-ting Rachel Chau; Cheng-Yen Wen; Tetsu Yonezawa
  Langmuir, 36, 13, 3386, 3392, 07 Apr. 2020, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• In situ TEM observation of liquid-state Sn nanoparticles vanishing in a SiO2 structure: a potential synthetic tool for controllable morphology evolution from core-shell to yolk-shell and hollow structures
  Shilei Zhu; Mai Thanh Nguyen; Tomoharu Tokunaga; Cheng-Yen Wen; Tetsu Yonezawa
  NANOSCALE ADVANCES, 2, 4, 1456, 1464, Apr. 2020
  English, Scientific journal
• Highly Correlated Size and Composition of Pt/Au Alloy Nanoparticles via Magnetron Sputtering onto Liquid
  Lianlian Deng; Mai Thanh Nguyen; Jingming Shi; Yuen-ting Rachel Chau; Tomoharu Tokunaga; Masaki Kudo; Syo Matsumura; Naoyuki Hashimoto; Tetsu Yonezawa
  Langmuir, 36, 12, 3004, 3015, American Chemical Society ({ACS}), 31 Mar. 2020, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Pt/Au alloy nanoparticles (NPs) in a wide composition range have been synthesized by room-temperature simultaneous sputter deposition from two independent magnetron sources onto liquid PEG (MW = 600). The prepared NPs were alloyed with the face-centered cubic (fcc) structure. In addition, the particle sizes, composition, and shape are strongly correlated but can be tailored by an appropriate variation of the sputtering parameters. No individual particle but large agglomerates with partial alloy structure formed at Pt content of less than 16 atom %. Highly dispersed NPs with no agglomeration were observed in PEG when the quantity of Pt is more than 26 atom %. On the other hand, a small amount of Pt could terminate the agglomeration of Au when sputtering on the grids for transmission electron microscope observation. Our experiment and computer simulation carried out by two different methods indicate that the composition-dependent particle size of Pt/Au can be explained by the atomic concentration, formation energy of the cluster, and interaction between different metal atoms and the PEG molecule.
• Giant Enhancement of THz Wave Emission under Double-Pulse Excitation of Thin Water Flow
  Hsin-hui Huang; Takeshi Nagashima; Tetsu Yonezawa; Yasutaka Matsuo; Soon Hock Ng; Saulius Juodkazis; Koji Hatanaka
  Applied Sciences, 10, 6, 2031, 2031, {MDPI} {AG}, Mar. 2020, [Peer-reviewed]
  English, Scientific journal, Simultaneous measurements of THz wave and hard X-ray emission from thin and flat water flow when irradiated by double femtosecond laser pulses (800 nm, 35 fs/transform-limited, 0.5 kHz, delay times up to 15 ns) were carried out. THz wave measurements by time-domain spectroscopy and X-ray detection by Geiger counters were performed at the transmission and the reflection sides of the flow. THz wave emission spectra show their dynamic peak shifts toward the low frequency with the highest intensity enhancements more than 1.5 × 10 3 times in |E| 2 accumulated over the whole spectrum range of 0–3 THz at the delay time of 4.7 ns between the two pulses. On the other hand, X-ray intensity enhancements are limited to about 20 times at 0 ns under the same experimental conditions. The mechanisms for the spectral changes and the intensity enhancements in THz wave emission are discussed from the viewpoint of laser ablation on the water flow induced by the pre-pulse irradiation.
• Silver Decorated Reduced Graphene Oxide as Electrocatalyst for Zinc–Air Batteries
  Laksanaporn Poolnapol; Wathanyu Kao-ian; Anongnat Somwangthanaroj; Falko Mahlendorf; Mai Thanh Nguyen; Tetsu Yonezawa; Soorathep Kheawhom
  Energies, 13, 2, 462, 462, {MDPI} {AG}, 17 Jan. 2020, [Peer-reviewed]
  English, Scientific journal
• Desorption and ionization of amino acid compounds observed by negative ion mode surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) using titanium oxide nanoparticles
  Tetsu Yonezawa; Takashi Asano; Mai Thanh Nguyen
  Nano Biomedicine, 12, 2, 101, 109, National Institute of Informatics, 2020
  English, Scientific journal
• Distinctive stability of a free-standing monolayer clay mineral nanosheet via transmission electron microscopy
  Ikumi Akita; Yohei Ishida; Tetsu Yonezawa
  Physical Chemistry Chemical Physics, Royal Society of Chemistry ({RSC}), 2020, [Peer-reviewed]
  Scientific journal
• Synthesis of composition-tunable Pd–Cu alloy nanoparticles by double target sputtering
  Yuen-ting Rachel Chau; Mai Thanh Nguyen; Mingbei Zhu; Arnaud Romier; Tomoharu Tokunaga; Tetsu Yonezawa
  New Journal of Chemistry, 44, 12, 4704, 4712, Royal Society of Chemistry (RSC), 2020
  Scientific journal,

  In this work, we introduce a green synthesis technique, double-target sputtering into a liquid polymer – polyethylene glycol (PEG, M. W. = 600), to synthesize palladium–copper (Pd–Cu) alloy nanoparticles (NPs) dispersed in PEG.

• Binder-Free Centimeter-Long V2O5 Nanofibers on Carbon Cloth as Cathode Material for Zinc-Ion Batteries
  Lyn Marie De Juan-Corpuz; Ryan Dula Corpuz; Anongnat Somwangthanaroj; Mai Thanh Nguyen; Tetsu Yonezawa; Jianmin Ma; Soorathep Kheawhom
  Energies, 13, 31, 19 Dec. 2019, [Peer-reviewed]
  English, Scientific journal
• Annealing induced a well-ordered single crystal δ-MnO2 and its electrochemical performance in zinc-ion battery
  Ryan Dula Corpuz; Lyn Marie Z. De Juan; Supareak Praserthdam; Rojana Pornprasertsuk; Tetsu Yonezawa; Mai Thanh Nguyen; Soorathep Kheawhom
  Scientific Reports, 9, 1, Nature Publishing Group, 01 Dec. 2019
  English, Scientific journal
• The Influence of Dimethyl Sulfoxide as Electrolyte Additive on Anodic Dissolution of Alkaline Zinc-Air Flow Battery
  Soraya Hosseini; Ali Abbasi; Luc-Olivier Uginet; Nicolas Haustraete; Supareak Praserthdam; Tetsu Yonezawa; Soorathep Kheawhom
  Scientific Reports, 9, 1, Nature Publishing Group, 01 Dec. 2019
  English, Scientific journal
• Green Synthesis of Size-Tunable Iron Oxides and Iron Nanoparticles in a Salt Matrix
  Mai Thanh Nguyen; Kai Yu; Tomoharu Tokunaga; Kornkit Boonyaperm; Soorathep Kheawhom; Masashi Arita; Tetsu Yonezawa
  ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 7, 21, 17697, 17705, Nov. 2019, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Basic [Au25(SCH2CH2Py)18]−⋅Na+ Clusters: Synthesis, Layered Crystallographic Arrangement, and Unique Surface Protonation
  Zhong Huang; Yohei Ishida; Tetsu Yonezawa
  Angewandte Chemie, in press, 16 Sep. 2019, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal, The synthesis of high‐purity and high‐yield Au25 clusters protected by the basic pyridyl ethanethiol (HSCH2CH2Py, 4‐PyET and 2‐PyET) is presented. Single‐crystal X‐ray diffraction of the [Au25(4‐PyET)18]−⋅Na+ clusters has revealed a structure similar to that known for the phenyl ethanethiolate analogue, but with pyridyl‐N coordination to Na+, a more relaxed ligand shell, and a profoundly layered arrangement in the solid state. Because of the pendant Py moiety, the [Au25(PyET)18]− clusters are endowed with unique (de)protonation equilibria, which has been characterized in detail by UV/Vis absorption and 1H NMR spectroscopy. [Au25(PyET)18]− clusters showed an unexpectedly H+‐dependent solubility that is tunable in aqueous and organic solvents. The successful synthesis of the basic Py‐terminated thiolate‐protected Au25 clusters paves the way to realize a new family of metalloid clusters possessing basic properties.
• High Aspect Ratio and Post-Processing Free Silver Nanowires as Top Electrodes for Inverted-Structured Photodiodes
  Min Jia Saw; Batu Ghosh; Mai Thanh Nguyen; Kridsada Jirasattayaporn; Soorathep Kheawhom; Naoto Shirahata; Tetsu Yonezawa
  ACS Omega, 4, 8, 13303, 13308, American Chemical Society ({ACS}), 20 Aug. 2019, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal, Silver nanowires (Ag NWs) as transparent conducting electrodes are widely used in many applications such as organic light-emitting diodes (OLEDs), polymer light-emitting diodes, touch screens, solar cells, and transparent heaters. In this work, using a large-scale synthesis, the synthesized Ag NWs had a high aspect ratio of 2820. The Ag NWs could be applied as a top transparent electrode in a device by simple drop-casting without any post-processing steps. The fabricated device comprised 4,4′-bis(carbazol-9-yl)biphenyl/MoO3 organic/inorganic layers which are parts of the inverted structure OLEDs or solar cells. The photodiode characteristics at the UV range were observed in the device. The ability of Ag NWs to replace opaque metals as top electrodes in a device has been demonstrated.
• Super Polycationic Molecular Compounds: Au144(SR+)60 Clusters
  Kunihiro Narita; Yohei Ishida; Tetsu Yonezawa; Zhong Huang
  The Journal of Physical Chemistry C, in press, 35, 21768, 21773, Aug. 2019, [Peer-reviewed], [Corresponding author]
  English, Scientific journal
• Porous ZnV2O4 Nanowire for Stable and High-Rate Lithium-Ion Battery Anodes
  Lyn Marie Z. De Juan-Corpuz; Mai Thanh Nguyen; Ryan D. Corpuz; Tetsu Yonezawa; Nataly Carolina Rosero-Navarro; Kiyoharu Tadanaga; Tomoharu Tokunaga; Soorathep Kheawhom
  ACS Applied Nano Materials, 2, 7, 4247, 4256, American Chemical Society ({ACS}), 26 Jul. 2019, [Peer-reviewed]
  English, Scientific journal, Porous ZnV2O4 nanowires (NWs) were successfully prepared by hydrothermal reaction followed by calcination. Despite the porous structure, these porous ZnV2O4 NWs are single crystal with {220} facets and a wire direction along the c-axis. On the basis of an electrochemical test, these porous ZnV2O4 NWs have better cycling stability and higher specific capacity (i.e., 460 mA h g–1 after 100 cycles and 149 mA h g–1 after 1000 cycles using 1 and 5 A g–1 current densities, respectively) compared to other morphologies (i.e., spherical and coral-like morphologies). As a ternary transition metal oxide, the produced porous ZnV2O4 NWs undergo phase transformation without compromising the resulting capacity. On the other hand, the CV curves at different scan rates indicate a pseudocapacitive electrochemical behavior of the porous ZnV2O4.
• Sintering Copper Nanoparticles with Photonic Additive for Printed Conductive Patterns by Intense Pulsed Light
  Wan-Yu Chung; Yi-Chin Lai; Tetsu Yonezawa; Ying-Chih Liao
  Nanomaterials, 9, 8, 1071, 25 Jul. 2019, [Peer-reviewed], [Corresponding author]
  English, Scientific journal, In this study, an ink formulation was developed to prepare conductive copper thin films with compact structure by using intense pulsed light (IPL) sintering. To improve inter-particle connections in the sintering process, a cuprous oxide shell was synthesized over copper nanoparticles (CuNP). This cuprous oxide shell can be reduced by IPL with the presence of a reductant and fused to form connection between large copper particles. However, the thermal yield stress after strong IPL sintering resulted in cracks of conductive copper film. Thus, a multiple pulse sintering with an off time of 2 s was needed to reach a low resistivity of 10−5 Ω·cm. To increase the light absorption efficiency and to further decrease voids between CuNPs in the copper film, cupric oxide nanoparticles (CuONP) of 50 nm, were also added into ink. The results showed that these CuONPs can be reduced to copper with a single pulse IPL and fused with the surrounding CuNPs. With an optimal CuNP/CuONP weight ratio of 1/80, the copper film showed a lowest resistivity of 7 × 10−5 Ω·cm, ~25% conductivity of bulk copper, with a single sintering energy at 3.08 J/cm2. The ink can be printed on flexible substrates as conductive tracks and the resistance remained nearly the same after 10,000 bending cycles.
• Dispersion of Copper Fine Particles for Conductive Inks and Pastes
  Tetsu YONEZAWA; Masaki MATSUBARA
  Journal of the Japan Society of Colour Material, 92, 7, 205, 209, Japan Society of Colour Material, 20 Jul. 2019, [Peer-reviewed], [Invited], [Lead author, Corresponding author]
  Scientific journal
• Preparation and Growth Mechanism of Pt/Cu Alloy Nanoparticles by Sputter Deposition onto a Liquid Polymer.
  Lianlian Deng; Mai Thanh Nguyen; Shuang Mei; Tomoharu Tokunaga; Masaki Kudo; Syo Matsumura; Tetsu Yonezawa
  Langmuir : the ACS journal of surfaces and colloids, 35, 25, 8418, 8427, 25 Jun. 2019, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
  English, Scientific journal, We use a green sputtering technique to deposit a Pt/Cu alloy target on liquid polyethylene glycol (PEG) to obtain well-dispersed and stable Pt29Cu71 alloy nanoparticles (NPs). The effects of sputtering current, rotation speed of the stirrer, sputtering time, sputtering period, and temperature of PEG on the particle size are studied systematically. Our key results demonstrate that the aggregation and growth of Pt/Cu alloy NPs occurred at the surface as well as inside the liquid polymer after the particles landed on the liquid surface. According to particle size analysis, a low sputtering current, high rotation speed for the stirrer, short sputtering period, and short sputtering time are found to be favorable for producing small-sized single crystalline alloy NPs. On the other hand, varying the temperature of the liquid PEG does not have any significant impact on the particle size. Thus, our findings shed light on controlling NP growth using the newly developed green sputtering deposition technique.
• Size-Tunable Alumina-Encapsulated Sn-Based Phase Change Materials for Thermal Energy Storage
  Shilei Zhu; Mai Thanh Nguyen; Tomoharu Tokunaga; Tetsu Yonezawa
  ACS APPLIED NANO MATERIALS, 2, 6, 3752, 3760, Jun. 2019, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• δ-MnO2 nanoflower/graphite cathode for rechargeable aqueous zinc ion batteries
  Sonti Khamsanga; Rojana Pornprasertsuk; Tetsu Yonezawa; Ahmad Azmin Mohamad; Soorathep Kheawhom
  Scientific Reports, 9, 8441, Jun. 2019, [Peer-reviewed]
  English, Scientific journal, Manganese oxide (MnO2) is one of the most promising intercalation cathode materials for zinc ion batteries (ZIBs). Specifically, a layered type delta manganese dioxide (δ-MnO2) allows reversible insertion/extraction of Zn2+ ions and exhibits high storage capacity of Zn2+ ions. However, a poor conductivity of δ-MnO2, as well as other crystallographic forms, limits its potential applications. This study focuses on δ-MnO2 with nanoflower structure supported on graphite flake, namely MNG, for use as an intercalation host material of rechargeable aqueous ZIBs. Pristine δ-MnO2 nanoflowers and MNG were synthesized and examined using X-ray diffraction, electron spectroscopy, and electrochemical techniques. Also, performances of the batteries with the pristine δ-MnO2 nanoflowers and MNG cathodes were studied in CR2032 coin cells. MNG exhibits a fast insertion/extraction of Zn2+ ions with diffusion scheme and pseudocapacitive behavior. The battery using MNG cathode exhibited a high initial discharge capacity of 235 mAh/g at 200 mA/g specific current density compared to 130 mAh/g which is displayed by the pristine δ-MnO2 cathode at the same specific current density. MNG demonstrated superior electrical conductivity compared to the pristine δ-MnO2. The results obtained pave the way for improving the electrical conductivity of MnO2 by using graphite flake support. The graphite flake support significantly improved performances of ZIBs and made them attractive for use in a wide variety of energy applications.
• Electrochemical exploration of the effects of calcination temperature of a mesoporous zinc vanadate anode material on the performance of Na-ion batteries
  Rasu Muruganantham; Irish Valerie Buiser Maggay; Lyn Marie Z. De Juan; Mai Thanh Nguyen; Tetsu Yonezawa; Chia-Her Lin; Yan-Gu Lin; Wei-Ren Liu
  Inorganic Chemistry Frontiers, in press, Royal Society of Chemistry ({RSC}), Jun. 2019, [Peer-reviewed]
  Scientific journal, Nowadays, transition metal oxides are being rapidly developed for application as Na-ion storage anode materials, which provide a relatively high theoretical capacity compared to the graphitic anode; however, the evaluation of enhanced electrochemical performance of SIBs via various approaches, such as coating or doping, is an ongoing process. Hence, in this study, a mesoporus ZnV2O4 anode material with a spinel structure was successfully synthesized via a solvothermal technique followed by calcination at different temperatures; moreover, the impact of the calcination temperature on the Na-ion storage performance of this anode material was thoroughly investigated for the first time. The initial discharge capacities of 178, 251, and 296 mA h g−1 were obtained for the cacination temperatures of 500, 600, and 700 °C, respectively; after 250 cycles, the ZVO-700 electrode retained the discharge capacity of 166 mA h g−1 at 200 mA g−1 with the high coulombic efficiency of 99%. Furthermore, ZVO-500 and ZVO-600 retained 55 mA h g−1 and 99 mA h g−1 with a ∼27% and ∼42% retention rate, respectively. The electrochemical Na-ion storage performance is predicted by the conversion reaction of ZnV2O4. Moreover, the ZVO-700 sample showed higher surface area and pore volume, which led to remarkable electrochemical performance, than the ZVO-500 and ZVO-600 samples.
• Synthesis of Sn/Ag–Sn nanoparticles via room temperature galvanic reaction and diffusion
  Min Jia Saw; Mai Thanh Nguyen; Shilei Zhu; Yongming Wang; Tetsu Yonezawa
  RSC Advances, 9, 38, 21786, 21792, Royal Society of Chemistry ({RSC}), Apr. 2019, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal, Tin (Sn) has a low melting temperature, i.e., 231.9 °C for the bulk, and the capability to form compounds with many metals. The galvanic reaction between Sn nanoparticles (NPs) as the core and silver nitrate at room temperature under argon gas in an organic solvent without any reducing power, was employed for the first time to coat an Ag–Sn intermetallic shell, i.e., Ag3Sn and/or Ag4Sn, on Sn NPs. For spherical Sn NPs, the NPs retained a spherical shape after coating. Uniform and Janus structures consisting of a β-Sn core with Ag–Sn shell were observed in the resulting NPs and their population related to the input molar ratios of the metal precursors. The observation of the intermetallic shell is general for both spherical and rod-shape Sn NPs. The formation of the intermetallic shell indicated that two reactions occurred sequentially, first reduction of Ag ions to Ag atoms by the Sn core, followed by interdiffusion of Ag and Sn to form the Ag–Sn intermetallic shell.
• Size-controlled Preparation of Alkylamine-stabilized Copper Fine Particles from Cupric Oxide (CuO) Micro-particles
  Tetsu Yonezawa; Jiajia Shi; Hiroki Tsukamoto; Mai Thanh Nguyen
  MRS Advances, 4, 7, 413, 418, Springer Science and Business Media LLC, Feb. 2019, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Monitor the Growth and Oxidation of Cu-nanoparticles in PEG after Sputtering
  Yuen-ting Rachel Chau; Lianlian Deng; Mai Thanh Nguyen; Tetsu Yonezawa
  MRS Advances, 4, 5-6, 305, 309, Springer Science and Business Media LLC, Jan. 2019, [Last author, Corresponding author]
  Scientific journal
• Sputtering onto a liquid: interesting physical preparation method for multi-metallic nanoparticles
  Mai Thanh Nguyen; Tetsu Yonezawa
  Science and Technology of Advanced Materials, 19, 1, 883, 898, Informa {UK} Limited, 31 Dec. 2018, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal, The young history of sputtering onto a liquid features great achievements in the green production of various metal and metal oxide nanoparticles (NPs) and nanoclusters (NCs). Studies on how the sputtering parameters affect the properties of NPs and NCs have elucidated their formation mechanism and marked a crucial role of liquid matrix in the nucleation and growth of particles, controlling their various properties. Current research has been devoted to making alloy bi- and trimetallic NPs with a high level of control over the NP structure, composition, and size via well-designed target systems, sputtering steps, and liquid matrix materials. In this minireview, we discuss the recent advances in the use of various types of targets to prepare different bi- and trimetallic NPs. In single target sputtering, systems with alternative configurations of metals, alloy targets, monometallic targets in sequence, and a combination of sputtering and chemical reactions have been developed. On the other hand, a double head system was introduced to widen the range of controllable sputtering parameters yielding more versatility in particle composition and fine structure. The synergistic and tuneable properties exhibited by the multi-metallic components in small NPs and NCs for their use in catalysis and optical applications are discussed.
• Ethanol as an electrolyte additive for alkaline zinc-air flow batteries
  Soraya Hosseini; Siow Jing Han; Amornchai Arponwichanop; Tetsu Yonezawa; Soorathep Kheawhom
  Scientific Reports, 8, 1, Nature Publishing Group, 01 Dec. 2018
  English, Scientific journal
• Electrochemical properties of novel FeV2O4 as an anode for Na-ion batteries
  Irish Valerie B. Maggay; Lyn Marie Z. De Juan; Jeng-Shin Lu; Mai Thanh Nguyen; Tetsu Yonezawa; Ting-Shan Chan; Wei-Ren Liu
  Scientific Reports, 8, 1, Nature Publishing Group, 01 Dec. 2018, [Peer-reviewed]
  English, Scientific journal
• Yttrium (III) Recovery with D2EHPA in Pseudo-Emulsion Hollow Fiber Strip Dispersion System
  Teerapon Pirom; Amornchai Arponwichanop; Ura Pancharoen; Tetsu Yonezawa; Soorathep Kheawhom
  Scientific Reports, 8, 1, Nature Publishing Group, 01 Dec. 2018, [Peer-reviewed]
  English, Scientific journal
• Microwave-Induced Plasma-In-Liquid Process for Nanoparticle Production
  Tetsu Yonezawa; David Čempel; Mai Thanh Nguyen
  Bulletin of the Chemical Society of Japan, 91, 12, 1781, 1798, The Chemical Society of Japan, Dec. 2018, [Peer-reviewed], [Invited]
  English, Scientific journal, In the past decades, various nanomaterials have been intensively developed because of their unique electrical, optical, magnetic as well as catalytic properties. In this review, we discuss the plasma-in-liquid process, especially the microwave-induced plasma-in-liquid process (MWPLP), for metal and metal oxide nanoparticle production. Various types of plasma systems have been employed to produce metal, alloy, and metal oxide nanoparticles. Nanoparticle production by plasma processes usually requires fewer chemical additives compared to other chemical processes. After discussing the bottom-up approach and the plasma-in-liquid process for nanoparticle synthesis, we have focused on MWPLP. Various apparatus systems and detailed mechanisms of MWPLP will be discussed and preparation of metal and metal oxide nanoparticles by MWPLP will be introduced in detail. The surface-coated-electrode system, which is a unique system for MWPLP, is also discussed in this review. This system prevents sample contamination due to the metal components, which are usually ejected into the surrounding liquid after plasma ignition during the production of nanoparticles.
• Enhancement of X-ray emission from nanocolloidal gold suspensions under double-pulse excitation
  Wei-Hung Hsu; Frances Camille P Masim; Armandas Balčytis; Hsin-Hui Huang; Tetsu Yonezawa; Aleksandr A Kuchmizhak; Saulius Juodkazis; Koji Hatanaka
  Beilstein Journal of Nanotechnology, 9, 2609, 2617, Beilstein Institut, 01 Oct. 2018, [Peer-reviewed]
  English, Scientific journal, Enhancement of X-ray emission was observed from a micro-jet of a nano-colloidal gold suspension in air under double-pulse excitation of ultrashort (40 fs) near-IR laser pulses. Temporal and spatial overlaps between the pre-pulse and the main pulse were optimized for the highest X-ray emission. The maximum X-ray intensity was obtained at a 1–7 ns delay of the main pulse irradiation after the pre-pulse irradiation with the micro-jet position shifted along the laser beam propagation. It was revealed that the volume around gold nanoparticles where the permittivity is near zero, ε ≈ 0, accounts for the strongest absorption, which leads to the effective enhancements of X-ray emission.
• Discharge Performance of Zinc-Air Flow Batteries Under the Effects of Sodium Dodecyl Sulfate and Pluronic F-127
  Soraya Hosseini; Woranunt Lao-atiman; Siow Jing Han; Amornchai Arpornwichanop; Tetsu Yonezawa; Soorathep Kheawhom
  Scientific Reports, 8, 14909, Oct. 2018, [Peer-reviewed]
  English, Scientific journal, Zinc-air batteries are a promising technology for large-scale electricity storage. However, their practical deployment has been hindered by some issues related to corrosion and passivation of the zinc anode in an alkaline electrolyte. In this work, anionic surfactant sodium dodecyl sulfate (SDS) and nonionic surfactant Pluronic F-127 (P127) are examined their applicability to enhance the battery performances. Pristine zinc granules in 7 M KOH, pristine zinc granules in 0–8 mM SDS/7 M KOH, pristine zinc granules in 0–1000 ppm P127/7 M KOH, and SDS coated zinc granules in 7 M KOH were examined. Cyclic voltammograms, potentiodynamic polarization, and electrochemical impedance spectroscopy confirmed that using 0.2 mM SDS or 100 ppm P127 effectively suppressed the anode corrosion and passivation. Nevertheless, direct coating SDS on the zinc anode showed adverse effects because the thick layer of SDS coating acted as a passivating film and blocked the removal of the anode oxidation product from the zinc surface. Furthermore, the performances of the zinc-air flow batteries were studied. Galvanostatic discharge results indicated that the improvement of discharge capacity and energy density could be sought by the introduction of the surfactants to the KOH electrolyte. The enhancement of specific discharge capacity for 30% and 24% was observed in the electrolyte containing 100 ppm P127 and 0.2 mM SDS, respectively.
• Ultrarapid Cationization of Gold Nanoparticles via a Single-Step Ligand Exchange Reaction
  Yohei Ishida; Jun Suzuki; Ikumi Akita; Tetsu Yonezawa
  Langmuir, 34, 36, 10668, 10672, American Chemical Society ({ACS}), 11 Sep. 2018, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal, We propose a novel method for the ultra-rapid cationization of gold nanoparticles with diameters ranging from several to a hundred nanometers via a single-step ligand exchange reaction of citrate-protected anionic gold nanoparticles with cationic thiol ligand. This reaction was performed only in an aqueous medium via a single step from citrate to cationic thiol, therefore enables a rapid preparation of cationic Au NPs without a contamination of organic solvent or lipid-soluble molecules. The cationization was successfully completed within 20 min without changes in the core diameter and optical characteristic.
• Copper ion production using zeolite and application to MALDI MS of small molecules
  Megumi Sakurai; Mengrui Yang; Jiawei Xu; Mai Thanh Nguyen; Tetsu Yonezawa; Kenro Hashimoto; Tatsuya Fujino
  International Journal of Mass Spectroscopy, 434, 179, 184, Elsevier BV, Sep. 2018, [Peer-reviewed]
  English, Scientific journal, CuO nanoparticles (CuO) loaded on zeolite (CuO/HM20) and zeolite whose active sites are substituted by copper (CuM20) have been developed as matrices for laser desorption ionization. CuO/HM20 showed efficient Cu+ production upon laser irradiation. By several spectroscopic results, it was found that CuO interacts with hydroxyl groups in zeolite and the lifetime of electron hole pair becomes long owing to the presence of the zeolite support. In addition, it was also found that water molecules surrounding the CuO play an important role in the Cu2++e → Cu+ reaction on the CuO surface. For CuM20, on the other hand, Cu+ production was not effective, probable because strong binding of Cu2+ with water molecules hindered the desorption of copper ions. These two matrices were applied to the desorption ionization of small molecules (arginine, tyrosine, heptacosan, melamine and creatinine). It was found that CuO/HM20 ionized analyte efficiently and CuM20 had selectivity for Cu+ adduction ionization.
• Kinetics of Cationic-Ligand-Exchange Reactions in Au25 Nanoclusters
  Zhong Huang; Yohei Ishida; Kunihiro Narita; Tetsu Yonezawa
  The Journal of Physical Chemistry C, 122, 31, 18142, 18150, 09 Aug. 2018, [Peer-reviewed], [Last author, Corresponding author]
  Scientific journal
• Sn Nanoparticles Confined in Porous Silica Spheres for Enhanced Thermal Cyclic Stability
  Zhu Shilei; Mai Thanh Nguyen; Fumoto Koji; Kanie Kiyoshi; Muramatsu Atsushi; Yonezawa Tetsu
  ACS APPLIED NANO MATERIALS, 1, 8, 4073, 4082, Aug. 2018, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• β-Sn Nanorods with Active (001) Tip Induced LiF-Rich SEI Layer for Stable Anode Material in Lithium Ion Battery
  Lyn Marie Z. De Juan; Irish Valerie B. Maggay; Mai Thanh Nguyen; Wei-Ren Liu; Tetsu Yonezawa
  ACS Applied Nano Materials, 1, 7, 3509, 3519, American Chemical Society ({ACS}), 27 Jul. 2018, [Peer-reviewed]
  English, Scientific journal
• Copper conductive patterns through spray-pyrolysis of copper-diethanolamine complex solution
  Jutamart Chotipanich; Suraya Hanim Abu Bakar; Amornchai Arponwichanop; Tetsu Yonezawa; Soorathep Kheawhom
  PLoS ONE, 13, 7, Public Library of Science, 01 Jul. 2018
  English, Scientific journal
• ZnV2O4: A potential anode material for sodium-ion batteries
  Irish Valerie Buiser Maggay; Lyn Marie Z. De Juan; Mai Thanh Nguyen; Tetsu Yonezawa; B. K. Chang; T. S. Chan; Wei-Ren Liu
  Journal of the Taiwan Institute of Chemical Engineers, 88, 161, 168, Taiwan Institute of Chemical Engineers, 01 Jul. 2018, [Peer-reviewed]
  English, Scientific journal
• Surface Design and Functional Prediction of Inorganic Nanoparticles for Electronic Material Applications
  Tetsu Yonezawa; Masaki Matsubara
  Journal of the Society of Powder Technology, Japan, 55, 6, 325, 333, The Society of Powder Technology, Japan, 10 Jun. 2018
  Scientific journal
• Sputter Deposition toward Short Cationic Thiolated Fluorescent Gold Nanoclusters: Investigation of Their Unique Structural and Photophysical Characteristics Using High-Performance Liquid Chromatography.
  Yohei Ishida; Akihiro Morita; Tomoharu Tokunaga; Tetsu Yonezawa
  Langmuir : the ACS journal of surfaces and colloids, 34, 13, 4024, 4030, 03 Apr. 2018, [Peer-reviewed], [Last author, Corresponding author], [International Magazine]
  English
• Electronic and ionic conductivities enhancement of zinc anode for flexible printed zinc-air battery
  Jutamart Chotipanich; Amornchai Arpornwichanop; Tetsu Yonezawa; Soorathep Kheawhom
  Engineering Journal, 22, 2, 47, 57, Chulalongkorn University, 30 Mar. 2018
  English, Scientific journal
• Sub-2 nm Single-Crystal Pt Nanoparticles via Sputtering onto a Liquid Polymer
  Lianlian Deng; Mai Thanh Nguyen; Tetsu Yonezawa
  Langmuir, 34, 8, 2876, 2881, American Chemical Society, 27 Feb. 2018, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Desorption and ionization of amino acids by surface-assisted laser desorption/ionization mass spectrometry (Saldi-MS) using titanium oxide nanoparticles in positive ion mode
  Takashi Asano; Tetsu Yonezawa
  Nano Biomedicine, 10, 2, 83, 90, National Institute of Informatics, 2018
  English, Scientific journal
• Ligand free green plasma-in-liquid synthesis of Au/Ag alloy nanoparticles
  David Čempel; Mai Thanh Nguyen; Yohei Ishida; Tomoharu Tokunaga; Tetsu Yonezawa
  New Journal of Chemistry, 42, 8, 5680, 5687, Royal Society of Chemistry, 2018, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Preparation of Ag nanoparticles using hydrogen peroxide as a reducing agent
  Masamu Nishimoto; Shigeaki Abe; Tetsu Yonezawa
  New Journal of Chemistry, 42, 14493, 14501, Royal Society of Chemistry ({RSC}), 2018, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• L-arginine-stabilized highly uniform Ag nanoparticles prepared in a microwave-induced plasma-in-liquid process (MWPLP)
  David Čempel; Mai Thanh Nguyen; Yohei Ishida; Tetsu Yonezawa
  Bulletin of the Chemical Society of Japan, 91, 3, 362, 367, Chemical Society of Japan, 2018, [Peer-reviewed]
  English, Scientific journal
• Real-Space Investigation of Energy Transfer through Electron Tomography
  Yohei Ishida; Ikumi Akita; Thomas Pons; Tetsu Yonezawa; Niko Hildebrandt
  Journal of Physical Chemistry C, 121, 51, 28395, 28402, American Chemical Society, 28 Dec. 2017, [Peer-reviewed]
  English, Scientific journal
• Matrix Sputtering Method: A Novel Physical Approach for Photoluminescent Noble Metal Nanoclusters
  Yohei Ishida; Ryan D. Corpuz; Tetsu Yonezawa
  ACCOUNTS OF CHEMICAL RESEARCH, 50, 12, 2986, 2995, Dec. 2017, [Peer-reviewed], [Invited]
  English, Scientific journal
• Au/Cu Bimetallic Nanoparticles via Double-Target Sputtering onto a Liquid Polymer
  Mai Thanh Nguyen; Hong Zhang; Lianlian Deng; Tomoharu Tokunaga; Tetsu Yonezawa
  LANGMUIR, 33, 43, 12389, 12397, Oct. 2017, [Peer-reviewed]
  English, Scientific journal
• Structural Control Parameters for Formation of Single-Crystalline ss-Sn Nanorods in Organic Phase
  Lyn Marie Z. De Juan; Mai Thanh Nguyen; Tetsu Yonezawa; Tomoharu Tokunaga; Hiroki Tsukamoto; Yohei Ishida
  CRYSTAL GROWTH & DESIGN, 17, 9, 4554, 4562, Sep. 2017, [Peer-reviewed]
  English, Scientific journal
• Effects of Additives on the Preparation of Ag Nanoparticles Using the Microwave-Induced Plasma in Liquid Process
  Masamu Nishimoto; Hiroki Tsukamoto; Mai Thanh Nguyen; Tetsu Yonezawa
  CHEMISTRYSELECT, 2, 26, 7873, 7879, Sep. 2017, [Peer-reviewed]
  English, Scientific journal
• Synthesis of Positively Charged Photoluminescent Bimetallic Au-Ag Nanoclusters by Double-Target Sputtering Method on a Biocompatible Polymer Matrix
  Ryan D. Corpuz; Yohei Ishida; Mai Thanh Nguyen; Tetsu Yonezawa
  LANGMUIR, 33, 36, 9144, 9150, Sep. 2017, [Peer-reviewed]
  English, Scientific journal
• Small Nanosized Oxygen-Deficient Tungsten Oxide Particles: Mechanistic Investigation with Controlled Plasma Generation in Water for Their Preparation.
  Yohei Ishida; Shingo Motono; Wataru Doshin; Tomoharu Tokunaga; Hiroki Tsukamoto; Tetsu Yonezawa
  ACS omega, 2, 8, 5104, 5110, 31 Aug. 2017, [Peer-reviewed], [International Magazine]
  English, Scientific journal, Production of oxygen-deficient tungsten oxide nanoparticles with a diameter of around 10 nm have been successfully developed using a microwave-induced plasma in liquid technique. The prepared blue-green nanoparticles exhibit strong absorption in the visible region; thus, these could be efficient visible-light photocatalysts. The high-angle annular dark-field images revealed the dislocation of tungsten, which causes oxygen deficiencies.
• Photoacoustic signal enhancements from gold nano-colloidal suspensions excited by a pair of time-delayed femtosecond pulses
  Frances Camille P. Masim; Wei-Hung Hsu; Hao-Li Liu; Tetsu Yonezawa; Armandas Balcytis; Saulius Juodkazis; Koji Hatanaka
  OPTICS EXPRESS, 25, 16, 19497, 19507, Aug. 2017, [Peer-reviewed]
  English, Scientific journal
• Particle size tuning in scalable synthesis of anti-oxidized copper fine particles by polypeptide molecular weights
  Tetsu Yonezawa; Hiroki Tsukamoto; Mai Thanh Nguyen
  ADVANCED POWDER TECHNOLOGY, 28, 8, 1966, 1971, Aug. 2017, [Peer-reviewed]
  English, Scientific journal
• Synthesis of cationically charged photoluminescent coinage metal nanoclusters by sputtering over a liquid polymer matrix
  Ryan D. Corpuz; Yohei Ishida; Tetsu Yonezawa
  NEW JOURNAL OF CHEMISTRY, 41, 14, 6828, 6833, Jul. 2017, [Peer-reviewed]
  English, Scientific journal
• TiO2 nanotube array with "multi-layer" walled structure and its vulnerability to water
  Chaorui Xue; Shengliang Hu; Wei Liu; Qing Chang; Tetsu Yonezawa; Jinlong Yang
  FUNCTIONAL MATERIALS LETTERS, 10, 3, Jun. 2017, [Peer-reviewed]
  English, Scientific journal
• Effect of H2O2 on Au nanoparticle preparation using microwave-induced plasma in liquid
  Masamu Nishimoto; Tetsu Yonezawa; David Cempel; Mai Thanh Nguyen; Yohei Ishida; Hiroki Tsukamoto
  MATERIALS CHEMISTRY AND PHYSICS, 193, 7, 12, Jun. 2017, [Peer-reviewed]
  English, Scientific journal
• Charge Neutralization Strategy: A Novel Synthetic Approach to Fully Cationized Thiolate-Protected Au-25(SR+)(18) Clusters with Atomic Precision
  Yohei Ishida; Yu-Ling Huang; Tetsu Yonezawa; Kunihiro Narita
  CHEMNANOMAT, 3, 5, 298, 302, May 2017, [Peer-reviewed]
  English, Scientific journal
• Water-dispersible fluorescent silver nanoparticles via sputtering deposition over liquid polymer using a very short thiol ligand
  Yohei Ishida; Ryota Nakabayashi; Ryan D. Corpuz; Tetsu Yonezawa
  COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 518, 25, 29, Apr. 2017, [Peer-reviewed]
  English, Scientific journal
• Preparation of Au/Pd Bimetallic Nanoparticles by a Microwave-Induced Plasma in Liquid Process
  Hiroaki Shirai; Mai Thanh Nguyen; David Cempel; Hiroki Tsukamoto; Tomoharu Tokunaga; Ying-Chih Liao; Tetsu Yonezawa
  BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 90, 3, 279, 285, Mar. 2017, [Peer-reviewed]
  English, Scientific journal
• Effect of decomposition and organic residues on resistivity of copper films fabricated via low-temperature sintering of complex particle mixed dispersions.
  Yingqiong Yong; Mai Thanh Nguyen; Hiroki Tsukamoto; Masaki Matsubara; Ying-Chih Liao; Tetsu Yonezawa
  SCIENTIFIC REPORTS, 7, 45150, Mar. 2017, [Peer-reviewed]
  English, Scientific journal
• Stabilization of the thermal decomposition process of self-reducible copper ion ink for direct printed conductive patterns
  Kuan-Ming Huang; Hiroki Tsukamoto; Yingqiong Yong; Hsien-Lung Chiu; Mai Thanh Nguyen; Tetsu Yonezawa; Ying-Chih Liao
  RSC ADVANCES, 7, 40, 25095, 25100, 2017, [Peer-reviewed]
  English, Scientific journal
• Use of decomposable polymer-coated submicron Cu particles with effective additive for production of highly conductive Cu films at low sintering temperature
  Y. Yong; M. T. Nguyen; T. Yonezawa; T. Asano; M. Matsubara; H. Tsukamoto; Y. Liao; T. Zhang; S. Isobe; Y. Nakagawa
  Journal of Materials Chemistry C, 5, 5, 1033, 1041, Royal Society of Chemistry, 2017, [Peer-reviewed], [Corresponding author]
  English, A method for producing Cu films with low resistivity, based on low temperature sintering, is demonstrated. The Cu inks for preparing conductive Cu films consisted of Cu particles that were coated with a decomposable polymer (poly(propylenecarbonate), PPC) as well as a self-reducible copper formate/1-amino-2- propanol (CuF-IPA) complex as an additive. The sintering temperature used in this study was as low as 100 degrees C. Following sintering at a temperature of 100 degrees C, the lowest reported resistivity (8.8 x 10(-7) Omega m) was achieved through the use of Cu-based metal-organic decomposition (MOD) inks. This was due to the dual promotional effects of the aminolysis of PPC with IPA and the pyrolysis of the CuF-IPA complex.
• Au Nanoplasma as Efficient Hard X-ray Emission Source
  Frances Camille P. Masim; Matteo Porta; Wei-Hung Hsu; Mai Thanh Nguyen; Tetsu Yonezawa; Armandas Balcytis; Saulius Juodkazis; Koji Hatanaka
  ACS PHOTONICS, 3, 11, 2184, 2190, Nov. 2016, [Peer-reviewed]
  English, Scientific journal
• Matrix Sputtering into Liquid Mercaptan: From Blue-Emitting Copper Nanoclusters to Red-Emitting Copper Sulfide Nanoclusters
  Matteo Porta; Mai Thanh Nguyen; Tomoharu Tokunaga; Yohei Ishida; Wei-Ren Liu; Tetsu Yonezawa
  LANGMUIR, 32, 46, 12159, 12165, Nov. 2016, [Peer-reviewed], [Last author, Corresponding author]
  English, Scientific journal
• Preparation of Water-Dispersible Palladium Nanoparticles Stabilized by Carbon-Palladium Bonds and Application to Suzuki-Miyaura Coupling in Water
  Tetsu Yonezawa; Koji Kawai; Hayato Kawakami; Takashi Narushima
  BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 89, 10, 1230, 1232, Oct. 2016, [Peer-reviewed]
  English, Scientific journal
• Fully Cationized Gold Clusters: Synthesis of Au-25(SR+)(18)
  Yohei Ishida; Kunihiro Narita; Tetsu Yonezawa; Robert L. Whetten
  JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 7, 19, 3718, 3722, Oct. 2016, [Peer-reviewed]
  English, Scientific journal
• Femtosecond laser-induced hard X-ray generation in air from a solution flow of Au nano-sphere suspension using an automatic positioning system
  Wei-Hung Hsu; Frances Camille P. Masim; Matteo Porta; Mai Thanh Nguyen; Tetsu Yonezawa; Armandas Balocytis; Xuewen Wang; Lorenzo Rosa; Saulius Juodkazis; Koji Hatanakai
  OPTICS EXPRESS, 24, 18, 19994, 20001, Sep. 2016, [Peer-reviewed]
  English, Scientific journal
• Understanding the primary and secondary aggregation states of sputtered silver nanoparticles in thiolate matrix and their immobilization in resin
  Yohei Ishida; Satoshi Udagawa; Tetsu Yonezawa
  COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 504, 437, 441, Sep. 2016, [Peer-reviewed]
  English, Scientific journal
• Ligand Effect on the Formation of Gold Nanoparticles via Sputtering Deposition over a Liquid Matrix
  Ikumi Akita; Yohei Ishida; Tetsu Yonezawa
  BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 89, 9, 1054, 1056, Sep. 2016, [Peer-reviewed]
  English, Scientific journal
• Au Nanoparticles Prepared Using a Coated Electrode in Plasma-in-Liquid Process: Effect of the Solution pH
  David Cempel; Mai Thanh Nguyen; Yohei Ishida; Hiroki Tsukamoto; Hiroaki Shirai; Yongming Wang; Kevin C. -W. Wu; Tetsu Yonezwa
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 16, 9, 9257, 9262, Sep. 2016, [Peer-reviewed]
  English, Scientific journal
• MHz-ultrasound generation by chirped femtosecond laser pulses from gold nano-colloidal suspensions
  Frances Camille P. Masim; Wei-Hung Hsu; Chih-Hung Tsai; Hao-Li Liu; Matteo Porta; Mai Thanh Nguyen; Tetsu Yonezawa; Armandas Balcytis; Xuewen Wang; Saulius Juodkazis; Koji Hatanaka
  OPTICS EXPRESS, 24, 15, 17050, 17059, Jul. 2016, [Peer-reviewed]
  English, Scientific journal
• Thiolate-Protected Gold Nanoparticles Via Physical Approach: Unusual Structural and Photophysical Characteristics.
  Ishida Y; Akita I; Sumi T; Matsubara M; Yonezawa T
  Scientific reports, 6, 29928, 29928, Nature Publishing Group, Jul. 2016, [Peer-reviewed]
  English, Here we report a novel physical approach for thiolate-protected fluorescent gold nanoparticles with a controlled size of the order of a few nanometers. This approach is based on a sputtering of gold into a liquid matrix containing thiolate ligand as a stabilizer at various concentrations, thus no reductant was used. The size of the gold nanoparticles was successfully controlled to range from 1.6 to 7.4 nm by adjusting the thiol concentrations. Surface plasmon absorption was observed in larger nanoparticles, but it was not observed in smaller ones. Such smaller nanoparticles fluoresced at around 670 nm with a small spectral shift according to their size, however, the diameter (1.6-2.7 nm) was very strange to show such red emission compared with photophysical characteristics of reported gold cluster or nanoparticles synthesized by chemical method. By detailed investigations using TEM, HAADF-STEM, XPS, and TGA, and size fractionation by size exclusion chromatography, we finally arrived at the plausible mechanism for the origin of unusual fluorescence property; the obtained gold nanoparticles are not single-crystal and are composed of aggregates of very small components such as multinuclear gold clusters or complexes.
• Enhanced photoacoustics from gold nano-colloidal suspensions under femtosecond laser excitation
  Frances Camille P. Masim; Hao-Li Liu; Matteo Porta; Tetsu Yonezawa; Armandas Balcytis; Saulius Juodkazis; Wei-Hung Hsu; Koji Hatanaka
  OPTICS EXPRESS, 24, 13, 14781, 14792, Jun. 2016, [Peer-reviewed]
  English, Scientific journal
• Growth of sputtered silver nanoparticles on a liquid mercaptan matrix with controlled viscosity and sputter rate
  Yohei Ishida; Satoshi Udagawa; Tetsu Yonezawa
  COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 498, 106, 111, Jun. 2016, [Peer-reviewed]
  English, Scientific journal
• Double target sputtering into liquid: A new approach for preparation of Ag-Au alloy nanoparticles
  Mai Thanh Nguyen; Tetsu Yonezawa; Yuan Wang; Tomoharu Tokunaga
  MATERIALS LETTERS, 171, 75, 78, May 2016, [Peer-reviewed]
  English, Scientific journal
• Assessment of Size and Morphological Effects of Ceramics Nanoparticles on Their Biocompatibility
  Satoshi Tsuchiya; Shigeaki Abe; Yuko Era; Yukari Nakagawa; Shuichi Yamagata; Mariko Nakamura; Teruo Kusaka; Yasuhiro Yoshida; Tetsu Yonezawa; Junichiro Iida
  Nanoscience and Nanotechnology Letters, 8, 4, 329, 334, Apr. 2016, [Peer-reviewed]
  English, Scientific journal
• Controlling an electrostatic repulsion by oppositely charged surfactants towards positively charged fluorescent gold nanoclusters
  Ryan D. Corpuz; Yohei Ishida; Tetsu Yonezawa
  PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 18, 13, 8773, 8776, Apr. 2016, [Peer-reviewed]
  English, Scientific journal
• Surface-Assisted Laser Desorption Ionization Mass Spectrometry (SALDI-MS) of Low-Molecular-Weight Medicines and Toxic Materials Using Commercial TiO2 Nanoparticles
  Tetsu Yonezawa; Takashi Asano; Masaki Matsubara
  BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 89, 3, 346, 353, Mar. 2016, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Estimation of Biocompatibility of Nano-Sized Ceramic Particles with Osteoblasts, Osteosarcomas and Hepatocytes by Static and Time-Lapse Observation
  Shigeaki Abe; Eri Seitoku; Nobuki Lwadera; Yusuke Hamba; Shuichi Yamagata; Tsukasa Akasaka; Teruo Kusaka; Satoshi Lnoue; Yasutaka Yawaka; Junichiro Lida; Hidehiko Sano; Tetsu Yonezawa; Yasuhiro Yoshida
  JOURNAL OF BIOMEDICAL NANOTECHNOLOGY, 12, 3, 472, 480, Mar. 2016, [Peer-reviewed]
  English, Scientific journal
• Hard-templating synthesis of macroporous platinum microballs (MPtM)
  Hiroaki Shirai; Yu-Yuan Huang; Tetsu Yonezawa; Tomoharu Tokunaga; Wei-Chen Chang; Saad M. Alshehri; Bo Jiang; Yusuke Yamauchi; Kevin C. -W. Wu
  MATERIALS LETTERS, 164, 488, 492, Feb. 2016, [Peer-reviewed], [Corresponding author]
  English, Scientific journal
• DeNovo Synthesis of Gold-Nanoparticle-Embedded, Nitrogen-Doped Nanoporous Carbon Nanoparticles (Au@NC) with Enhanced Reduction Ability
  Yu-Te Liao; Jeffrey E. Chen; Yohei Isida; Tetsu Yonezawa; Wei-Chen Chang; Saad M. Alshehri; Yusuke Yamauchi; Kevin C. -W. Wu
  CHEMCATCHEM, 8, 3, 502, 509, Feb. 2016, [Peer-reviewed]
  English, Scientific journal
• Highly stable and blue-emitting copper nanocluster dispersion prepared by magnetron sputtering over liquid polymer matrix
  Matteo Porta; Mai Thanh Nguyen; Yohei Ishida; Tetsu Yonezawa
  RSC ADVANCES, 6, 107, 105030, 105034, 2016, [Peer-reviewed]
  English, Scientific journal
• Photochemical Reaction in Two Dimensional Assemblies of Functional Dyes on Inorganic Nanosheets
  Yohei Ishida; Tetsu Yonezawa
  KOBUNSHI RONBUNSHU, 73, 1, 12, 18, 2016, [Peer-reviewed]
  Japanese, Scientific journal
• Titanium oxide nanoparticle dispersions in a liquid monomer and solid polymer resins prepared by sputtering
  Matteo Porta; Mai Thanh Nguyen; Tetsu Yonezawa; Tomoharu Tokunaga; Yohei Ishida; Hiroki Tsukamoto; Yuichi Shishino; Yoshikiyo Hatakeyama
  NEW JOURNAL OF CHEMISTRY, 40, 11, 9337, 9343, 2016
  English, Scientific journal
• Reproducible shape control of single-crystal SnO micro particles
  Mai Thanh Nguyen; Hiroaki Shirai; Chondanai Tiankanon; Hiroki Tsukamoto; Yohei Ishida; Tetsu Yonezawa
  RSC ADVANCES, 6, 32, 26725, 26733, 2016, [Peer-reviewed]
  English, Scientific journal
• Low temperature sintering process of copper fine particles under nitrogen gas flow with Cu2+-alkanolamine metallacycle compounds for electrically conductive layer formation
  Tetsu Yonezawa; Hiroki Tsukamoto; Yingqiong Yong; Mai Thanh Nguyen; Masaki Matsubara
  RSC ADVANCES, 6, 15, 12048, 12052, 2016, [Peer-reviewed]
  English, Scientific journal
• A new approach for additive-free room temperature sintering of conductive patterns using polymer-stabilized Sn nanoparticles
  Hiroaki Shirai; Mai Thanh Nguyen; Yohei Ishida; Tetsu Yonezawa
  JOURNAL OF MATERIALS CHEMISTRY C, 4, 11, 2228, 2234, 2016, [Peer-reviewed]
  English, Scientific journal
• Mesoporous Europium-Doped Titania Nanoparticles (Eu-MTNs) for Luminescence-Based Intracellular Bio-Imaging
  Kuan-Chou Chen; Saikat Dutta; Yusuke Yamauchi; Saad M. Alshehri; Mai Thanh Nguyen; Tetsu Yonezawa; Kun-Hung Shen; Kevin C. -W. Wu
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 15, 12, 9802, 9806, Dec. 2015, [Peer-reviewed]
  English, Scientific journal
• Effect of Glass Transition Temperature of Stabilizing Polymer of Air-Stable Gelatin-Stabilized Copper Fine Particles during Redox Two-Step Low-Temperature Sintering Process
  Masaki Matsubara; Tetsu Yonezawa; Hiroki Tsukamoto
  BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 88, 12, 1755, 1759, Dec. 2015, [Peer-reviewed]
  English, Scientific journal
• Scanning Electron Microscope Observation of Carbon Nanotubes with Room Temperature Ionic Liquids: Effect of Their Hydrophilicities
  Atsushi Hyono; Shigeaki Abe; Koji Kawai; Tetsu Yonezawa
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 15, 11, 9272, 9274, Nov. 2015, [Peer-reviewed]
  English, Scientific journal
• Black TiO2 Nanoparticles by a Microwave-induced Plasma over Titanium Complex Aqueous Solution
  Yohei Ishida; Wataru Doshin; Hiroki Tsukamoto; Tetsu Yonezawa
  CHEMISTRY LETTERS, 44, 10, 1327, 1329, Oct. 2015, [Peer-reviewed]
  English, Scientific journal
• Enhanced Terahertz Emission from CuxO/Metal Thin Film Deposited on Columnar-Structured Porous Silicon
  Xu Lu; Yohei Ishida; Tomobumi Mishina; Mai Thanh Nguyen; Tetsu Yonezawa
  BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 88, 10, 1385, 1387, Oct. 2015, [Peer-reviewed]
  English, Scientific journal
• A Novel Physical Approach for Cationic-Thiolate Protected Fluorescent Gold Nanoparticles
  Yohei Ishida; Chaiyathat Lee; Tetsu Yonezawa
  SCIENTIFIC REPORTS, 5, 15382, Oct. 2015, [Peer-reviewed]
  English, Scientific journal
• Reduction of carbon dioxide using a visible-light-induced electron transfer system with colloidal metal nanoparticle catalysts: evidence for production of methane
  責任著者; 平川 和貴; 共著者]Kazutaka Hirakawa; Yumi Yamaji; Tetsu Yonezawa; Naoki Toshima
  Current Topics in Catalysis, 11, (num), 55, 63, May 2015, [Peer-reviewed]
• Formation and Optical Properties of Fluorescent Gold Nanoparticles Obtained by Matrix Sputtering Method with Volatile Mercaptan Molecules in the Vacuum Chamber and Consideration of Their Structures
  Taiki Sumi; Shingo Motono; Yohei Ishida; Naoto Shirahata; Tetsu Yonezawa
  LANGMUIR, 31, 14, 4323, 4329, Apr. 2015, [Peer-reviewed]
  English, Scientific journal
• Cladding Layer on Well-Defined Double-Wall TiO2 Nanotubes
  Chaorui Xue; Tetsu Yonezawa; Mai Thanh Nguyen; Xu Lu
  LANGMUIR, 31, 4, 1575, 1580, Feb. 2015, [Peer-reviewed]
  English, Scientific journal
• Synthesis of binary solid solution Cu-Pd nanoparticles by DMF reduction for enhanced photoluminescence properties
  Masashi Chiba; Mai Nguyen Thanh; Yasuchika Hasegawa; Yasushi Obora; Hideya Kawasaki; Tetsu Yonezawa
  JOURNAL OF MATERIALS CHEMISTRY C, 3, 3, 514, 520, 2015
  English, Scientific journal
• Selective and reactive hydration of nitriles to amides in water using silver nanoparticles stabilized by organic ligands
  Koji Kawai; Hayato Kawakami; Takashi Narushima; Tetsu Yonezawa
  JOURNAL OF NANOPARTICLE RESEARCH, 17, 2, 1, 9, Jan. 2015, [Peer-reviewed]
  English, Scientific journal
• Electroconductive pretreatment of several types of non-conductive wet biological samples for SEM using a room temperature ionic liquid: simple and rapid conductive preparation
  Mami Mutoh; Shigeaki Abe; Atsushi Hyono; Hiroshi Matsuura; Ko Nakanishi; Koji Kawai; Mariko Nakamura; Satoshi Inoue; Yasuhiro Yoshida; Junichiro Iida; Tetsu Yonezawa
  Nano Biomedicine, 7, 2, 80, 2015, [Peer-reviewed]
• Proton-assisted low-temperature sintering of Cu fine particles stabilized by a proton-initiating degradable polymer
  Masaki Matsubara; Tetsu Yonezawa; Takato Minoshima; Hiroki Tsukamoto; Yingqiong Yong; Yohei Ishida; Mai Thanh Nguyen; Hiroki Tanaka; Kazuki Okamoto; Takuya Osaka
  RSC ADVANCES, 5, 124, 102904, 102910, 2015, [Peer-reviewed]
  English, Scientific journal
• X-ray diffraction and high-resolution TEM observations of biopolymer nanoskin-covered metallic copper fine particles: preparative conditions and surface oxidation states
  Tetsu Yonezawa; Yoshiki Uchida; Hiroki Tsukamoto
  PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 48, 32511, 32516, 2015, [Peer-reviewed]
  English, Scientific journal
• One-pot preparation of cationic charged Pt nanoparticles by the autocatalytic hydrolysis of acetylthiocholine
  Yohei Ishida; Thatchanont Jirasupangkul; Tetsu Yonezawa
  NEW JOURNAL OF CHEMISTRY, 39, 6, 4214, 4217, 2015, [Peer-reviewed]
  English, Scientific journal
• Sputtering synthesis and optical investigation of octadecanethiol-protected fluorescent Au nanoparticles
  Yohei Ishida; Taiki Sumi; Tetsu Yonezawa
  NEW JOURNAL OF CHEMISTRY, 39, 8, 5895, 5897, 2015, [Peer-reviewed]
  English, Scientific journal
• Synthesis and fluorescence properties of a nanoisland-structured SiOx/CuxO composite
  Xu Lu; Yohei Ishida; Mai Thanh Nguyen; Tetsu Yonezawa
  JOURNAL OF MATERIALS CHEMISTRY C, 3, 32, 8358, 8363, 2015, [Peer-reviewed]
  English, Scientific journal
• Low-temperature nanoredox two-step sintering of gelatin nanoskin-stabilized submicrometer-sized copper fine particles for preparing highly conductive layers
  Tetsu Yonezawa; Hiroki Tsukamoto; Masaki Matsubara
  RSC ADVANCES, 5, 75, 61290, 61297, 2015, [Peer-reviewed]
  English, Scientific journal
• Plasma induced tungsten doping of TiO2 particles for enhancement of photocatalysis under visible light
  Yohei Ishida; Yasutomo Motokane; Tomoharu Tokunaga; Tetsu Yonezawa
  PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 38, 24556, 24559, 2015, [Peer-reviewed]
  English, Scientific journal
• Synthesis of magnetic mesoporous titania colloidal crystals through evaporation induced self-assembly in emulsion as effective and recyclable photocatalysts
  Jeffrey E. Chen; Hong-Yuan Lian; Saikat Dutta; Saad M. Alshehri; Yusuke Yamauchi; Mai Thanh Nguyen; Tetsu Yonezawa; Kevin C. -W. Wu
  PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17, 41, 27653, 27657, 2015, [Peer-reviewed]
  English, Scientific journal
• The mechanism of alkylamine-stabilized copper fine particles towards improving the electrical conductivity of copper films at low sintering temperature
  Yingqiong Yong; Tetsu Yonezawa; Masaki Matsubara; Hiroki Tsukamoto
  JOURNAL OF MATERIALS CHEMISTRY C, 3, 23, 5890, 5895, 2015, [Peer-reviewed]
  English, Scientific journal
• Silver sputtering into a liquid matrix containing mercaptans: the systematic size control of silver nanoparticles in single nanometer-orders
  Yohei Ishida; Ryota Nakabayashi; Masaki Matsubara; Tetsu Yonezawa
  NEW JOURNAL OF CHEMISTRY, 39, 6, 4227, 4230, 2015, [Peer-reviewed]
  English, Scientific journal
• Double-wall TiO2 nanotube arrays: enhanced photocatalytic activity and in situ TEM observations at high temperature.
  Chaorui Xue; Takashi Narushima; Yohei Ishida; Tomoharu Tokunaga; Tetsu Yonezawa
  ACS applied materials & interfaces, 6, 22, 19924, 32, 26 Nov. 2014, [Peer-reviewed], [International Magazine]
  English, Scientific journal, By decreasing the water content in an NH4F and glycerol-water electrolyte, the transition from single-wall to double-wall TiO2 nanotube arrays was successfully achieved using an anodization method. The double-wall TiO2 nanotube structures exhibited better photocatalytic activity than the typical single-wall structures. After modification with platinum nanoparticles, the photocatalytic activity of both the single- and double-wall TiO2 nanotubes was improved further. In situ observations at the annealing temperature of the TiO2 nanotubes were performed using a transmission electron microscopy (TEM) system. A slower structural failure of the nanotubes was obtained with the introduction of oxygen gas into the TEM column compared with the structural changes observed under high-vacuum conditions without the introduction of oxygen gas. These behaviors suggest that oxygen injection is an important factor in stabilizing the TiO2 nanotubes during the in situ TEM annealing process. The high-magnification TEM images of the double-wall TiO2 nanotubes revealed that the sintering of the inner wall can draw a clear distinction between the inner and outer walls.
• Influence of Surface Properties on SEM Observation for Carbon Nanotubes with Pretreatment Using Room Temperature Ionic Liquids
  Shigeaki Abe; Atsushi Hyono; Tetsu Yonezawa
  JOURNAL OF SOLUTION CHEMISTRY, 43, 9-10, 1645, 1654, Oct. 2014, [Peer-reviewed]
  English, Scientific journal
• Copper film prepared from copper fine particle paste by laser sintering at room temperature: Influences of sintering atmosphere on the morphology and resistivity
  Gang Qin; Akira Watanabe; Hiroki Tsukamoto; Tetsu Yonezawa
  JAPANESE JOURNAL OF APPLIED PHYSICS, 53, 9, 印刷中, Sep. 2014, [Peer-reviewed]
  English, Scientific journal
• In Situ Transmission Electron Microscopic Observation of Double-wall TiO2 Nanotube Arrays at High Temperature
  Chaorui Xue; Takashi Narushima; Yohei Ishida; Tomoharu Tokunaga; Tetsu Yonezawa
  CHEMISTRY LETTERS, 43, 9, 1514, 1516, Sep. 2014, [Peer-reviewed]
  English, Scientific journal
• Wet Preparation of Organic-Stabilizer-Free Urchin Structured Nickel Fine Particles and Their In Situ TEM Observation at High Temperatures
  Takashi Narushima; Ren Lu; Tetsu Yonezawa
  MATERIALS TRANSACTIONS, 55, 9, 1474, 1478, Sep. 2014, [Peer-reviewed]
  English, Scientific journal
• Formation Process of Metallic Copper Fine Particles from Cupric Oxide Microparticles at Room Temperature
  Tetsu Yonezawa; Yoshiki Uchida; Yuki Abe
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 14, 7, 5402, 5407, Jul. 2014, [Peer-reviewed]
  English, Scientific journal
• Simple and Rapid Conductive Preparation of Wet Biological Samples for SEM Observation: Use of an Asymmetrical Choline-like Room Temperature Ionic Liquid as a Visualizing Agent
  ABE SHIGEAKI; HYONO ATSUSHI; KAWAI KOJI; NAKAMURA KOICHI; YAWAKA YASUTAKA; YOSHIDA YASUHIRO; YONEZAWA TETSU
  Nano Biomed, 6, 1, 41, 46, 30 Jun. 2014
  English
• イオン液体を用いたバイオマテリアルのSEM新規観察法の開発
  兵野 篤; 米澤 徹; 阿部 薫明; 赤坂 司; 亘理 文夫
  北海道外科雑誌, 59, 1, 91, 92, 北海道外科学会, Jun. 2014
  Japanese
• SEM observation of the live morphology of human red blood cells under high vacuum conditions using a novel RTIL
  Atsushi Hyono; Tetsu Yonezawa; Koji Kawai; Shigeaki Abe; Mitsuhiro Fujihara; Hiroshi Azuma; Shinobu Wakamoto
  SURFACE AND INTERFACE ANALYSIS, 46, 6, 425, 428, Jun. 2014, [Peer-reviewed]
  English, Scientific journal
• Responses of RAW264.7 macrophages to water-dispersible gold and silver nanoparticles stabilized by metal-carbon sigma-bonds
  Masanori Hashimoto; Hirokazu Toshima; Tetsu Yonezawa; Koji Kawai; Takashi Narushima; Masayuki Kaga; Kazuhiko Endo
  JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A, 102, 6, 1838, 1849, Jun. 2014, [Peer-reviewed]
  English, Scientific journal
• Alignment of Needle TiO_2_ Nanoparticles in Water
  Atsushi Hasegawa; Masamitsu Yoshiki; Tsuguhito Nakano; Susumu Sato; Tetsu Yonezawa
  International Journal of Theoretical and Applied Nanotechnology, 2, 1, 18, 23, 31 Mar. 2014, [Peer-reviewed]
  English, Scientific journal, Alignment of needle-like nanoparticles in solution because of migration due to an electric field is observed using Rayleigh-Mie scattering. This is confirmed by the change in the signal form as a function of the scattering angle. It is clearly observed that the signal profiles between the aligned and non-aligned situations are different. The theoretical calculation of Rayleigh-Mie scattering based on a single spherical particle is used for analyzing the experimental data. The theoretical analysis is in good agreement with the result of experiment.
• Visualizing Preparation Using Asymmetrical Choline-Like Ionic Liquids for Scanning Electron Microscope Observation of Non-Conductive Biological Samples
  Shigeaki Abe; Atsushi Hyono; Koji Kawai; Tetsu Yonezawa
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 14, 3, 2620, 2623, Mar. 2014, [Peer-reviewed]
  English, Scientific journal
• Wet Preparation of Organic Stabilizer Free Urchin Structured Nickel Fine Particles and Their In-Situ TEM Observation at High Temperature
  Takashi Narushima; Ren Lu; Tetsu Yonezawa
  JOURNAL OF THE JAPAN INSTITUTE OF METALS, 78, 2, 98, 102, Feb. 2014, [Peer-reviewed]
  Japanese, Scientific journal
• Evaluation of Silver Nanoparticle Toxicity to RAW264.7 Cells in a Three-Dimensional Cell Culture
  Masanori Hashimoto; Hirokazu Toshima; Tetsu Yonezawa; Koji Kawai; Masahiro Iijima; Kazuhiko Endo
  JOURNAL OF BIOMATERIALS AND TISSUE ENGINEERING, 4, 1, 51, 58, Jan. 2014, [Peer-reviewed]
  English, Scientific journal
• Salmon milt DNA as a template for the mass production of Ag nanoparticles
  Tomomi Takeshima; Ling Sun; Yanqing Wang; Yoshihisa Yamada; Norio Nishi; Tetsu Yonezawa; Bunshi Fugetsu
  POLYMER JOURNAL, 46, 1, 36, 41, Jan. 2014, [Peer-reviewed]
  English, Scientific journal
• Overlook of Gold Nanoparticles and Other Metal Nanoparticles Containing Gold
  YONEZAWA Tetsu
  Oleoscience, 14, 1, 11, 15, Japan Oil Chemists' Society, 2014
  Japanese,

  Gold nanoparticles have been widely used as a good inorganic red pigment which show dark wine red color. Gold nanoparticles are considered as a long life pigment. Red stained glasses often used in old churches are old glasses containing gold nanoparticles. They are very clear and show dark red color. The history of the chemistry of gold nanoparticles is very long, and began in 1857. Faraday firstly reported the preparation of red gold hydrosol^{1, 2)}. Gold itself is a highly precious materials and show brilliant gold luster. However, gold nanoparticles show considerably different color. Gold has attracted much interest not only from scientists. Such gold nanoparticles can be prepared quite readily by chemical reduction of the corresponding salts, which also support their intensive scientific studies. Recently, Brust et al. reported the preparation of single nanometer-sized gold nanoparticles by NaBH₄ reduction³⁾. This pioneering report introduced explosive expansion of nanoparticle researches. Gold nanoclusters and gold nanocatalysts which are also invented quite recently still continue to attract the peoples' interest. In this section, I would like to overlook the studies of gold nanoparticles.

• Terahertz Emission from CuxO/Au Thin Film
  Xu Lu; Tetsu Yonezawa
  2014 INTERNATIONAL TOPICAL MEETING ON MICROWAVE PHOTONICS (MWP) AND THE 2014 9TH ASIA-PACIFIC MICROWAVE PHOTONICS CONFERENCE (APMP), 164, 165, 2014, [Peer-reviewed]
  English, International conference proceedings
• Cyclodextrin-supported organic matrix for application of MALDI-MS for forensics. Soft-ionization to obtain protonated molecules of low molecular weight compounds
  Tetsu Yonezawa; Takashi Asano; Tatsuya Fujino; Hiroshi Nishihara
  CHEMICAL PHYSICS, 419, 17, 22, Jun. 2013, [Peer-reviewed]
  English, Scientific journal
• In-Plane Orientation Control of 2,7-Diphenyl[1]benzothieno[3,2-b][1]benzothiophene Monolayer on Bismuth-Terminated Si(111) Vicinal Surfaces with Wettability Optimization
  Manabu Ohtomo; Yuya Tsuchida; Naoki Muraya; Takashi Yanase; Seiji Sakai; Tetsu Yonezawa; Taro Nagahama; Tetsuya Hasegawa; Toshihiro Shimada
  JOURNAL OF PHYSICAL CHEMISTRY C, 117, 22, 11555, 11561, Jun. 2013, [Peer-reviewed]
  English, Scientific journal
• Surfactant Free-solution Synthesis of Copper Nanoparticles for Low Temperature Sintering and Conductive Paste
  KAWASAKI Hideya; OBORA Yasushi; YONEZAWA Toru; ARAKAWA Ryuichi
  Journal of The Adhesion Society of Japan, 49, 5, 171, 176, The Adhesion Society of Japan, 01 May 2013
  Japanese
• Suitability of GaP nanoparticles as a surface-assisted laser desorption/ionization mass spectroscopy
  T. Yonezawa; H. Tsukamoto; S; Hayashi Y; Myojin H. Kawasaki; R.Arakawa
  Analyst, 138, 995-999, May 2013
  2013/5/
• Structure Consideration of Platinum Nanoparticles Constructing Nanostructures Obtained by Electrochemical Dealloying of a Cu-Pt Alloy
  Kazuki Maruya; Ryoji Yamauchi; Takashi Narushima; Seiji Miura; Tetsu Yonezawa
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 13, 4, 2999, 3003, Apr. 2013, [Peer-reviewed]
  English, Scientific journal
• Simple pretreatment of non-conductive small hydrous bio-samples with choline-type ionic liquid and membrane filter for microsample mounting
  Koji Kawai; Kotaro Kaneko; Hayato Kawakami; Takashi Narushima; Tetsu Yonezawa
  COLLOIDS AND SURFACES B-BIOINTERFACES, 102, 9, 12, Feb. 2013, [Peer-reviewed]
  English, Scientific journal
• Use of a bio-polymer as protective reagent for the metal particles for electronic parts
  Tetsu Yonezawa
  Kobunshi Ronbunshu, 70, 12, 684, 692, Society of Polymer Science, 2013, [Peer-reviewed]
  Japanese, Scientific journal
• Micromorphological cellular responses of MC3T3-E1 and RAW264.7 after exposure to water-dispersible silver nanoparticles stabilized by metal-carbon σ-bonds
  Masanori Hashimoto; Hirokazu Toshima; Tetsu Yonezawa; Koji Kawai; Takashi Narushima; Masayuki Kaga; Kazuhiko Endo
  Dental Materials Journal, 32, 5, 725, 733, 2013, [Peer-reviewed]
  English, Scientific journal
• Scanning Electron Microscope Observation of Nano Carbon Materials with Imidazolium-Type Room Temperature Ionic Liquids
  Shigeaki Abe; Atsushi Hyono; Katsutoshi Nakayama; Tomoya Takada; Tetsu Yonezawa
  JAPANESE JOURNAL OF APPLIED PHYSICS, 52, 1, Jan. 2013, [Peer-reviewed]
  English, Scientific journal
• Preparation of Copper Nanoparticles in Liquid by Matrix Sputtering Process
  Ko Nakagawa; Takashi Narushima; Satoshi Udagawa; Tetsu Yonezawa
  15TH INTERNATIONAL CONFERENCE ON THIN FILMS (ICTF-15), 417, 2013, [Peer-reviewed]
  English, International conference proceedings
• Direct SEM Observation of Non-electroconductive TiOF2 Nanotube Arrays Prepared by Anodization Using an Ionic Liquid as a Visualizing Reagent
  Chaorui Xue; Takashi Narushima; Tetsu Yonezawa
  JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS, 23, 1, 239, 242, Jan. 2013, [Peer-reviewed]
  English, Scientific journal
• Biocompatibility and biodistribution of several nano-sized ceramics particles
  Shigeaki Abe; Yusaku Hamba; Nobuki Iwadera; Tsukasa Akasaka; Shuichi Yamagata; Yasutaka Yawaka; Junichiro Iida; Motohiro Uo; Tetsu Yonezawa; Fumio Watari
  BIOCERAMICS 24, 529-530, 625, +, 2013, [Peer-reviewed]
  English, International conference proceedings
• Near-infrared photoluminescence from molecular crystals containing tellurium
  Hong Tao Sun; Yoshio Sakka; Naoto Shirahata; Minoru Fujii; Tetsu Yonezawa
  Journal of Materials Chemistry, 22, 47, 24792, 24797, 21 Dec. 2012, [Peer-reviewed]
  English, Scientific journal
• Temperature distributions of electron beam-irradiated samples by scanning electron microscopy
  T. Tokunaga; T. Narushima; T. Yonezawa; T. Sudo; S. Okubo; S. Komatsubara; K. Sasaki; Takahisa Yamamoto
  JOURNAL OF MICROSCOPY, 248, 3, 228, 233, Dec. 2012, [Peer-reviewed]
  English, Scientific journal
• Synthesis and antibacterial properties of water-dispersible silver nanoparticles stabilized by metal-carbon sigma-bonds
  Koji Kawai; Takashi Narushima; Kotaro Kaneko; Hayato Kawakami; Miyuki Matsumoto; Atsushi Hyono; Hiroshi Nishihara; Tetsu Yonezawa
  APPLIED SURFACE SCIENCE, 262, 76, 80, Dec. 2012, [Peer-reviewed]
  English, Scientific journal
• Fabrication of ZnO Nanorods by Atmospheric-Pressure Solid-Source CVD Using Ethanol-Assisted Low-Temperature Vaporization
  Sawako Miyamoto; Tetsuya Hasegawa; Hiroyuki Takahashi; Tetsu Yonezawa; Hajime Kiyono; Takashi Yanase; Taro Nagahama; Toshihiro Shimada
  BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 85, 12, 1287, 1292, Dec. 2012, [Peer-reviewed]
  English, Scientific journal
• High temperature oxidation event of gelatin nanoskin-coated copper fine particles observed by in situ TEM
  Takashi Narushima; Hiroki Tsukamoto; Tetsu Yonezawa
  AIP ADVANCES, 2, 4, Dec. 2012, [Peer-reviewed]
  English, Scientific journal
• Self-assembly of gold nanoparticles on a single crystalline sapphire substrate
  Hiroyuki Takahashi; Naoto Shirahata; Takashi Narushima; Tetsu Yonezawa
  APPLIED SURFACE SCIENCE, 262, 129, 133, Dec. 2012, [Peer-reviewed]
  English, Scientific journal
• Ultra-broad near-infrared photoluminescence from crystalline (K-crypt) 2Bi2 containing [Bi2]^2- dimers
  Hong Tao Sun; Tetsu Yonezawa; Miriam M. Gillett-Kunnath; Yoshio Sakka; Naoto Shirahata; Sa Chu Rong Gui; Minoru Fujii; Slavi C. Sevov
  Journal of Materials Chemistry, 22, 38, 20175, 20178, 14 Oct. 2012, [Peer-reviewed]
  English, Scientific journal
• In-Situ Heating TEM Observation of Microscopic Structural Changes of Size-Controlled Metallic Copper/Gelatin Composite
  Takashi Narushima; Atsushi Hyono; Naoki Nishida; Tetsu Yonezawa
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 12, 10, 7764, 7776, Oct. 2012, [Peer-reviewed]
  English, Scientific journal
• Photoluminescence from Bi 5(GaCl 4) 3 molecular crystal
  Hong Tao Sun; Beibei Xu; Tetsu Yonezawa; Yoshio Sakka; Naoto Shirahata; Minoru Fujii; Jianrong Qiu; Hong Gao
  Dalton Transactions, 41, 36, 11055, 11061, 36, 28 Sep. 2012, [Peer-reviewed]
  Scientific journal
• 金属が再び未来を照らす 第三の蛍光材料:構造制御された金属ナノクラスター
  米澤徹
  化学, 67, 8, 64-65, Aug. 2012, [Invited]
  Japanese, Scientific journal
• A method for accurate temperature measurement using infrared thermal camera
  Tomoharu Tokunaga; Takashi Narushima; Tetsu Yonezawa; Takayuki Sudo; Shuichi Okubo; Shigeyuki Komatsubara; Katsuhiro Sasaki; Takahisa Yamamoto
  JOURNAL OF ELECTRON MICROSCOPY, 61, 4, 223, 227, Aug. 2012, [Peer-reviewed]
  English, Scientific journal
• 高度ナノ粒子の製法と応用 低温基材用ナノインクに向けたシングルナノサイズの銅ナノ粒子の製造法
  川崎英也; 米澤徹; 荒川隆一
  ケミカルエンジニヤリング, 57, 7, 538-542, 542, 化学工業社, Jul. 2012, [Invited]
  Japanese, Scientific journal
• Preparation of naked silver nanoparticles in a TEM column and direct in situ observation of their structural changes at high temperature
  Tetsu Yonezawa; Shigeo Arai; Hironori Takeuchi; Takeo Kamino; Kotaro Kuroda
  CHEMICAL PHYSICS LETTERS, 537, 65, 68, Jun. 2012, [Peer-reviewed]
  English, Scientific journal
• Preparation of Copper Particles by Microwave Induced Plasma in Liquid Process
  Takashi Narushima; Takayuki Yoshioka; Hideki Miyazaki; Ikumasa Suga; Susumu Sato; Tetsu Yonezawa
  JOURNAL OF THE JAPAN INSTITUTE OF METALS, 76, 4, 229, 233, Apr. 2012, [Peer-reviewed]
  Japanese, Scientific journal
• Comparison of biodistribution and biocompatibility of gelatin-coated copper nanoparticles and naked copper oxide nanoparticles
  Shigeaki Abe; Nobuki Iwadera; Takashi Narushima; Yoshiki Uchida; Motohiro Uo; Tsukasa Akasaka; Yasutaka Yawaka; Fumio Watari; Tetsu Yonezawa
  e-Journal of Surface Science and Nanotechnology, 10, 33, 37, 17 Mar. 2012, [Peer-reviewed]
  English, International conference proceedings
• Observation of Microstructural Changes in Polymer-Coated Kompeito-Type Platinum Particles by In Situ Heating TEM
  Takashi Narushima; Takuya Makino; Tomoharu Tokunaga; Tetsu Yonezawa
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 12, 3, 2612, 2616, Mar. 2012, [Peer-reviewed]
  English, Scientific journal
• Change in the Morphology of the Terrace Edges on Graphite Surfaces by Electrochemical Reduction
  Shosei Kubota; Tetsu Yonezawa; Taro Nagahama; Toshihiro Shimada
  CHEMISTRY LETTERS, 41, 2, 187, 188, Feb. 2012, [Peer-reviewed]
  English, Scientific journal
• Conductivity preparation by choline lactate ethanol solution for SEM observation: Both hard and soft tissues in living matter
  Shigeaki Abe; Atsushi Hyono; Yuri Machida; Fumio Watari; Tetsu Yonezawa
  Nano Biomedicine, 4, 1, 18, 23, National Institute of Informatics, 2012
  English, Scientific journal
• Surfactant-free single-nano-sized colloidal Cu nanoparticles for use as an active catalyst in Ullmann-coupling reaction
  Yuto Isomura; Takashi Narushima; Hideya Kawasaki; Tetsu Yonezawa; Yasushi Obora
  CHEMICAL COMMUNICATIONS, 48, 31, 3784, 3786, 2012, [Peer-reviewed]
  English, Scientific journal
• Behavior of Cu nanoparticles ink under reductive calcination for fabrication of Cu conductive film
  Kiyonobu Ida; Masanori Tomonari; Yasuyuki Sugiyama; Yuki Chujyo; Tomoharu Tokunaga; Tetsu Yonezawa; Kotaro Kuroda; Katsuhiro Sasaki
  THIN SOLID FILMS, 520, 7, 2789, 2793, Jan. 2012, [Peer-reviewed]
  English, Scientific journal
• Internal diffusion of biocompatible polymer-coated inorganic nanoparticles in mice
  Shigeaki Abe; Akiko Sakaki; Takashi Narushima; Yoshiki Uchida; Tsukasa Akasaka; Motohiro Uo; Tetsu Yonezawa; Fumio Watari
  Key Engineering Materials, 493-494, 752, 756, 2012
  English, International conference proceedings
• Experimental and theoretical studies of photoluminescence from Bi-8(2+) and Bi-5(3+) stabilized by [AlCl4](-) in molecular crystals
  Hong-Tao Sun; Yoshio Sakka; Naoto Shirahata; Hong Gao; Tetsu Yonezawa
  JOURNAL OF MATERIALS CHEMISTRY, 22, 25, 12837, 12841, 2012, [Peer-reviewed]
  English, Scientific journal
• Synthesis of nanoparticles of silver and platinum by microwave-induced plasma in liquid
  Susumu Sato; Kunihiko Mori; Osamu Ariyada; Hyono Atsushi; Tetsu Yonezawa
  SURFACE & COATINGS TECHNOLOGY, 206, 5, 955, 958, Nov. 2011, [Peer-reviewed]
  English, Scientific journal
• Size of Elementary Clusters and Process Period in Silver Nanoparticle Formation
  Masafumi Takesue; Takuya Tomura; Mitsuru Yamada; Katsuhiko Hata; Shigeo Kuwamoto; Tetsu Yonezawa
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 133, 36, 14164, 14167, Sep. 2011, [Peer-reviewed]
  English, Scientific journal
• Bioinspired Choline-like Ionic Liquids: Their Penetration Ability through Cell Membranes and Application to SEM Visualization of Hydrous Samples
  Koji Kawai; Kotaro Kaneko; Hayato Kawakami; Tetsu Yonezawa
  LANGMUIR, 27, 16, 9671, 9675, Aug. 2011, [Peer-reviewed]
  English, Scientific journal
• Hydrophilic Quaternary Ammonium Type Ionic Liquids. Systematic Study of the Relationship among Molecular Structures, Osmotic Pressures, and Water-Solubility
  Koji Kawai; Kotaro Kaneko; Tetsu Yonezawa
  LANGMUIR, 27, 12, 7353, 7356, Jun. 2011, [Peer-reviewed]
  English, Scientific journal
• Reversible On/Off Conductance Switching of Single Diarylethene Immobilized on a Silicon Surface
  Kazuki Uchida; Yoshinori Yamanoi; Tetsu Yonezawa; Hiroshi Nishihara
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 133, 24, 9239, 9241, Jun. 2011, [Peer-reviewed]
  English, Scientific journal
• Observation of a 3D network nano-structure of carbon nanotubes scaffold for cultivation
  Shigeaki Abe; Kosuke Ishikawa; Atsushi Hyono; Hirohisa Kobayashi; Takayuki Kiba; Tsukasa Akasaka; Motohiro Uo; Yasutaka Yawaka; Shin-Ichiro Sato; Tetsu Yonezawa; Fumio Watari
  e-Journal of Surface Science and Nanotechnology, 9, 80, 84, 05 Mar. 2011, [Peer-reviewed]
  English, International conference proceedings
• In-situ TEM Observation of Crystal Structural Change in Metal Nanoparticles(Growth and Novel Functions of Nanocrystals)
  Yonezawa Tetsu; Hyono Atsushi
  Journal of the Japanese Association of Crystal Growth, 37, 4, 291, 296, 日本結晶成長学会, Jan. 2011, [Invited]
  Japanese, Scientific journal, Metal nanoparticles are have special properties depending their size such as melting point suppression and Localized Surface Plasmon Resonance. Therefore, the application of them to some electronic components is attractive because of their easiness for processing. In-situ TEM observation is useful for observation of their crystal structural changes in nanoparticles. Some study have already proposed abut the melting suppression, the crystal formation from amorphous and the sintering process of metal particles.
• Preparation of Optical Resins Containing Dispersed Gold Nanoparticles by the Matrix Sputtering Method
  Yuichi Shishino; Tetsu Yonezawa; Satoshi Udagawa; Kaname Hase; Hiroshi Nishihara
  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 50, 3, 703, 705, 2011, [Peer-reviewed]
  English, Scientific journal
• Microwave-assisted polyol synthesis of copper nanocrystals without using additional protective agents
  Hideya Kawasaki; Yuka Kosaka; Yuki Myoujin; Takashi Narushima; Tetsu Yonezawa; Ryuichi Arakawa
  CHEMICAL COMMUNICATIONS, 47, 27, 7740, 7742, 2011, [Peer-reviewed]
  English, Scientific journal
• Non-oxidative copper nano and fine particles for electroconductive materials
  Tetsu Yonezawa; Hiroki Tsukamoto; Takashi Narushima
  Proceedings of the IEEE Conference on Nanotechnology, 1588, 1591, 2011, [Peer-reviewed]
  English, International conference proceedings
• Efficient fabrication of substrates for surface-assisted laser desorption/ionization mass spectrometry using laser ablation in liquids
  Tsuji, Takeshi; Mizuki, Takeshi; Yasutomo, Masato; Tsuji, Masaharu; Kawasaki, Hideya; Yonezawa, Tetsu; Mafuné, Fumitaka
  Applied Surface Science, 257, 6, 2046, 2050, Elsevier BV, 2011, [Peer-reviewed]
  Scientific journal
• Observation of Internal Distribution Behavior of Micro/Nano-Sized Ceramics and Metal Particles in Mice
  Shigeaki Abe; Nobuki Iwadera; Mami Mutoh; Chika Koyama; Mitsue Esaki; Tsukasa Akasaka; Motohiro Uo; Manabu Morita; Yoshinori Kuboki; Koichi Haneda; Yasutaka Yawaka; Fumio Uchida; Tetsu Yonezawa; Fumio Watari
  Bioceramics Development and Applications, 1, D110134, Jan. 2011, [Peer-reviewed]
  English, Scientific journal
• Controlled Immobilization of Nanoparticles by Self-Assembling : Techniques with DNA Templates
  UDAGAWA Satoshi; YONEZAWA Tetsu
  IEEJ Transactions on Sensors and Micromachines, 130, 12, 808, 811, The Institute of Electrical Engineers of Japan, 01 Dec. 2010
  Japanese, This article has no abstract.
• Detailed investigation of the reduction process of cupric oxide (CuO) to form metallic copper fine particles with a unique diameter
  Tetsu Yonezawa; Atsushi Hyono; Naoki Nishida
  JOURNAL OF MATERIALS SCIENCE, 45, 23, 6433, 6439, Dec. 2010, [Peer-reviewed]
  English, Scientific journal
• マイクロ・ナノ粒子の体内循環挙動の追跡と生体への影響
  岩寺 信喜; 石川 紘佑; 伊藤 佐智子; 阿部 薫明; 赤坂 司; 宇尾 基弘; 八若 保孝; 亘理 文夫; 高田 知哉; 米澤 徹
  日本バイオマテリアル学会大会予稿集, 32回, 323, 323, 日本バイオマテリアル学会, Nov. 2010
  Japanese
• Fabrication of Reusable Aluminum Printing Plate with Conducting Polymer
  KIKUCHI Tatsuya; SHIMAGUCHI Hiroko; UEDA Mikito; SAKAIRI Masatoshi; YONEZAWA Tetsu; TAKAHASHI Hideaki
  Journal of The Surface Finishing Society of Japan, 61, 9, 652, 657, 表面技術協会, Sep. 2010, [Peer-reviewed]
  Japanese, Scientific journal, A printing plate for gravure printing consisting of five layers of aluminum alloy / anodic oxide film / nickel / polypyrrole / copper was fabricated by anodizing, electro-less plating, electroplating, and electro-polymerization. Nickel layers were first deposited on anodic oxide film-covered aluminum alloy by electro-less plating and electroplating. The polypyrrole layer was then deposited on the nickel layer by anodic polarization in a pyrrole monomer solution. Many copper fine particles were deposited on the polypyrrole-deposited specimen at the initial stage of electroplating in the CuSO...
• ナノ粒子・ナノテクと部会
  米澤 徹
  化学と工業 = Chemistry and chemical industry, 63, 9, 752, 752, 01 Sep. 2010
  Japanese
• 金属ナノ粒子 (特集 世界で活躍する日本の材料技術)
  成島 隆; 米澤 徹
  高圧ガス, 47, 8, 632, 635, 高圧ガス保安協会, Aug. 2010, [Invited]
  Japanese, Scientific journal
• Wet Preparation Process of Metal Nano- and Fine-particles and Their Applications
  HYONO Atsushi; YONEZAWA Tetsu
  Ceramics Japan, 45, 8, 609, 612, 日本セラミックス協会, Aug. 2010, [Invited]
  Japanese, Scientific journal
• Corrosion of Al-Sn-Bi alloys in alcohols at high temperatures. Part II: Effect of anodizing on corrosion
  Tatsuya Kikuchi; Yasuhito Hara; Masatoshi Sakairi; Tetsu Yonezawa; Akira Yamauchi; Hideaki Takahashi
  CORROSION SCIENCE, 52, 8, 2525, 2534, Aug. 2010, [Peer-reviewed]
  English, Scientific journal
• Preparation of Zinc Oxide Nanoparticles by Using Microwave-induced Plasma in Liquid
  Tetsu Yonezawa; Atsushi Hyono; Susumu Sato; Osamu Ariyada
  CHEMISTRY LETTERS, 39, 7, 783, 785, Jul. 2010, [Peer-reviewed]
  English, Scientific journal
• マウスに投与したマイクロ・ナノ無機粒子の生体内分布の追跡と細胞への影響
  岩寺 信喜; 阿部 薫明; 石川 紘佑; 赤坂 司; 宇尾 基弘; 大口 郁子; 八若 保孝; 亘理 文夫; 米澤 徹
  北海道外科雑誌, 55, 1, 84, 85, 北海道外科学会, Jun. 2010
  Japanese
• Internal distribution of micro-/nano-sized ceramics and metals particles in mice
  Shigeaki Abe; Ikuhiro Kida; Mitsue Esaki; Nobuki Iwadera; Mami Mutoh; Chika Koyama; Tsukasa Akasaka; Motohiro Uo; Yoshinori Kuboki; Manabu Morita; Yoshinori Sato; Koichi Haneda; Tetsu Yonezawa; Balachandran Jeyadevan; Kazuyuki Tohji; Fumio Watari
  JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 118, 1378, 525, 529, Jun. 2010, [Peer-reviewed]
  English, Scientific journal
• One-pot Preparation of Antioxidized Copper Fine Particles with a Unique Structure by Chemical Reduction at Room Temperature
  Tetsu Yonezawa; Naoki Nishida; Atsushi Hyono
  CHEMISTRY LETTERS, 39, 6, 548, 549, Jun. 2010, [Peer-reviewed]
  English, Scientific journal
• Corrosion of Al-Sn-Bi alloys in alcohol at high temperatures. Part I: Effects of the metallurgical structure of the alloys and the metal salt additions to alcohol
  Tatsuya Kikuchi; Yasuhito Hara; Masatoshi Sakairi; Tetsu Yonezawa; Akira Yamauchi; Hideaki Takahashi
  CORROSION SCIENCE, 52, 4, 1482, 1491, Apr. 2010, [Peer-reviewed]
  English, Scientific journal
• Analysis of Polymer Layers on Red Blood Cell Surfaces with Soft Particle Models
  Atsushi Hyono; Jerome F. L. Duval; Hiroyuki Ohshima; Toshio Mazda; Tetsu Yonezawa
  KOBUNSHI RONBUNSHU, 67, 12, 654, 665, 2010, [Peer-reviewed], [Invited]
  Japanese, Scientific journal
• Platinum Nanaflowers on Scratched Silicon by Galvanic Displacement for an Effective SALDI Substrate
  Hideya Kawasaki; Teruyuki Yao; Takashi Suganuma; Kouji Okumura; Yuichi Iwaki; Tetsu Yonezawa; Tatsuya Kikuchi; Ryuichi Arakawa
  CHEMISTRY-A EUROPEAN JOURNAL, 16, 35, 10832, 10843, 2010, [Peer-reviewed]
  English, Scientific journal
• Molten matrix sputtering synthesis of water-soluble luminescent Au nanoparticles with a large Stokes shift
  Yuichi Shishino; Tetsu Yonezawa; Koji Kawai; Hiroshi Nishihara
  CHEMICAL COMMUNICATIONS, 46, 38, 7211, 7213, 2010, [Peer-reviewed]
  English, Scientific journal
• Sulfonate group-modified FePtCu nanoparticles as a selective probe for LDI-MS analysis of oligopeptides from a peptide mixture and human serum proteins
  Hideya Kawasaki; Tarui Akira; Takehiro Watanabe; Kazuyoshi Nozaki; Tetsu Yonezawa; Ryuichi Arakawa
  ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 395, 5, 1423, 1431, Nov. 2009, [Peer-reviewed]
  English, Scientific journal
• In-Situ TEM Observations of the Crystallization Process of Solution-Prepared MoS2 Amorphous Particles
  Akinori Hanzawa; Toshihiro Shimada; Tetsuya Hasegawa; Takahiro Sato; Takeo Kamino; Tetsu Yonezawa
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 9, 11, 6736, 6740, Nov. 2009, [Peer-reviewed]
  English, Scientific journal
• 各種マイクロ・ナノ粒子の生体内での分布状態の追跡とその可視化
  阿部 薫明; 岩寺 信喜; 武藤 麻未; 林 大輔; 大口 郁子; 赤坂 司; 宇尾 基弘; 亘理 文夫; 高田 知哉; 米澤 徹
  日本バイオマテリアル学会大会予稿集, 31回, 414, 414, 日本バイオマテリアル学会, Nov. 2009
  Japanese
• Basic Studies and Recent Topics for Applications of Metal Nanoparticles
  HYONO Atsushi; YONEZAWA Tetsu
  Journal of the Japan Society of Colour Material, 82, 10, 468, 474, Japan Society of Colour Material, 20 Oct. 2009
  Japanese, Recently, metal nanoparticles have been attracting much interest as a new industrial material with their unique properties such as localized surface plasmon resonance (LSPR) and catalytic properties depending on the particle sizes. Various preparation methods have been developed in order to obtain monodispersed and stable particles. Using a wet process, size and shape can be readily controlled. Au, Ag and Cu nanoparticles appear visible colors by LSPR and are developed as an inorganic pigment. Other properties such as spectral changes with their sizes and their surface enhanced Raman scattering are applied to quick and high sensitive bio-sensing. It is also expected their unique catalytic properties can be applied to green chemistry.
• Observation of Biodistribution of Indium-Tin Oxide Nanoparticles in Mice
  Shigeaki ABE; Tetsu YONEZAWA; Tsukasa AKASAKA; Motohiro UO; Fumio UCHIDA; Fumio WATARI
  Nano Biomedicine, 1, 1, 70, 74, Jun. 2009, [Peer-reviewed]
  English, Scientific journal
• Detailed Investigation on the Possibility of Nanoparticles of Various Metal Elements for Surface-Assisted Laser Desorption/Ionization Mass Spectrometry
  Tetsu Yonezawa; Hideya Kawasaki; Akira Tarui; Takehiro Watanabe; Ryuichi Arakawa; Toshihiro Shimada; Fumitaka Mafune
  ANALYTICAL SCIENCES, 25, 3, 339, 346, Mar. 2009, [Peer-reviewed]
  English, Scientific journal
• Surface Immobilization of PSI Using Vitamin K(1)-Like Molecular Wires for Fabrication of a Bio-Photoelectrode
  Mariko Miyachi; Yoshinori Yamanoi; Tetsu Yonezawa; Hiroshi Nishihara; Michinao Iwai; Masae Konno; Masako Iwai; Yasunori Inoue
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 9, 3, 1722, 1726, Mar. 2009, [Peer-reviewed]
  English, Scientific journal
• Plugging a Molecular Wire into Photosystem I: Reconstitution of the Photoelectric Conversion System on a Gold Electrode
  Nao Terasaki; Noritaka Yamamoto; Takashi Hiraga; Yoshinori Yamanoi; Tetsu Yonezawa; Hiroshi Nishihara; Tsutomu Ohmori; Makoto Sakai; Masaaki Fujii; Akihiko Tohri; Masako Iwai; Yasunori Inoue; Satoshi Yoneyama; Makoto Minakata; Isao Enami
  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 48, 9, 1585, 1587, 2009, [Peer-reviewed]
  English, Scientific journal
• Gold-Nanoparticle-Supported Silicon Plate with Polymer Micelles for Surface-Assisted Laser Desorption/Ionization Mass Spectrometry of Peptides
  Akira Tarui; Hideya Kawasaki; Takuma Taiko; Takehiro Watanabe; Tetsu Yonezawa; Ryuichi Arakawa
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 9, 1, 159, 164, Jan. 2009, [Peer-reviewed]
  English, Scientific journal
• In-situ observation of silver nanoparticle ink at high temperature
  Tetsu Yonezawa
  BIO-MEDICAL MATERIALS AND ENGINEERING, 19, 1, 29, 34, 2009, [Peer-reviewed]
  English, Scientific journal
• Production of Nanoparticles and Their Applications
  YONEZAWA Tetsu
  Jitsumu Hyomen Gijutsu, 59, 11, 712, 717, The Surface Finishing Society of Japan, 01 Nov. 2008
  Japanese
• Layer-by-layer self-assembled mutilayer films of gold nanoparticles for surface-assisted laser desorption/ionization mass spectrometry
  Hideya Kawasaki; Tsuyoshi Sugitani; Takehiro Watanabe; Tetsu Yonezawa; Hiroshi Moriwaki; Ryuichi Arakawa
  ANALYTICAL CHEMISTRY, 80, 19, 7524, 7533, Oct. 2008, [Peer-reviewed]
  English, Scientific journal
• Surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) of low molecular weight organic compounds and synthetic polymers using zinc oxide (ZnO) nanoparticles
  Takehiro Watanabe; Hideya Kawasaki; Tetsu Yonezawa; Ryuichi Arakawa
  JOURNAL OF MASS SPECTROMETRY, 43, 8, 1063, 1071, Aug. 2008, [Peer-reviewed]
  English, Scientific journal
• Size-controlled oxidation-resistant copper fine particles covered by biopolymer nanoskin
  Masanori Tomonari; Kiyonobu Ida; Hiromi Yamashita; Tetsu Yonezawa
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 8, 5, 2468, 2471, May 2008, [Peer-reviewed]
  English, Scientific journal
• The preparation of copper fine particle paste and its application as the inner electrode material of a multilayered ceramic capacitor
  Tetsu Yonezawa; Shinsuke Takeoka; Hiroshi Kishi; Kiyonobu Ida; Masanori Tomonari
  NANOTECHNOLOGY, 19, 14, Apr. 2008, [Peer-reviewed]
  English, Scientific journal
• Surface bottom-up fabrication of porphyrin-terminated metal complex molecular wires with photo-electron conversion properties on ITO
  Mariko Miyachi; Makiko Ohta; Misaki Nakai; Yoshihiro Kubota; Yoshinori Yamanoi; Tetsu Yonezawa; Hiroshi Nishihara
  CHEMISTRY LETTERS, 37, 4, 404, 405, Apr. 2008, [Peer-reviewed]
  English, Scientific journal
• Cross-sectional STEM observation of nanoparticle-attached silicon wafer: Specimen prepared by focused ion-beam
  Tetsu Yonezawa; Yoshinori Yamanoi; Hiroshi Nishihara
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 8, 3, 1518, 1522, Mar. 2008, [Peer-reviewed]
  English, Scientific journal
• Easy preparation of stable iron oxide nanoparticles using gelatin as stabilizing molecules
  Tetsu Yonezawa; Keigo Kamoshita; Masayoshi Tanaka; Takatoshi Kinoshita
  JAPANESE JOURNAL OF APPLIED PHYSICS, 47, 2, 1389, 1392, Feb. 2008, [Peer-reviewed]
  English, Scientific journal
• Wet Preparation of Metal Nanoparticles and their Immobilization on Silicon Substrates
  Tetsu Yonezawa; Yoshinori Yamanoi; Hiroshi Nishihara
  Metal Nanoclusters in Catalysis and Materials Science: The Issue of Size Control, 453, 458, Elsevier, 2008, [Peer-reviewed]
  English, In book
• Room-temperature immobilization of gold nanoparticles on Si(111) surface and their electron behaviour
  Tetsu Yonezawa; Kazuki Uchida; Yoshinori Yamanoi; Shintaro Horinouchi; Nao Terasaki; Hiroshi Nishihara
  PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 10, 46, 6925, 6927, 2008, [Peer-reviewed]
  English, Scientific journal
• Behavior of in vitro, in vivo and internal motion of micro/nano particles of titanium, titanium oxides and others
  Fumio Watari; Shigeaki Abe; Chika Koyama; Atsuro Yokoyama; Tukasa Akasaka; Motohiro Uo; Makoto Matsuoka; Yasunori Totsuka; Mitsue Esaki; Manabu Morita; Tetsu Yonezawa
  JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 116, 1349, 1, 5, Jan. 2008, [Peer-reviewed]
  English, Scientific journal
• Effects of preparation conditions on the synthesis off nano-sized Ag metal particles by the wet-process using 3-mercapto-propionic acid
  Masanori Tomonari; Kiyonobu Ida; Hironori Imanishi; Tetsu Yonezawa; Kohsuke Mori; Hiromi Yamashita
  RESEARCH ON CHEMICAL INTERMEDIATES, 34, 5-7, 641, 647, 2008, [Peer-reviewed]
  English, Scientific journal
• Observation of electrochemical single-electron-transfer events of gold nanoparticles in aqueous solution in the presence of both ammonium and sulfonate surface-active agents
  Misaki Nakai; Yoshinori Yamanoi; Yoshihiko Nishimori; Tetsu Yonezawa; Hiroshi Nishihara
  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 47, 35, 6699, 6702, 2008, [Peer-reviewed]
  English, Scientific journal
• Fusion and growth behavior of gold nanoparticles stabilized by allylmercaptane
  Naoto Shirahata; Tetsu Yonezawa; Yoshihiro Matsushita; Yoshitake Masuda; Kunihito Koumoto
  MACROMOLECULAR SYMPOSIA, 270, 82, 87, 2008, [Peer-reviewed]
  English, International conference proceedings
• Nanocage catalysts-rhodium nanoclusters encapsulated with dendrimers as accessible and stable catalysts for olefins and nitroarene hydrogenations
  Ikuse Nakamula; Yoshinori Yamanoi; Tetsu Yonezawa; Takane Imaoka; Kimihisa Yamamoto; Hiroshi Nishihara
  CHEMICAL COMMUNICATIONS, 44, 5716, 5718, 2008, [Peer-reviewed]
  English, Scientific journal
• Platinum nanoflowers for surface-assisted laser desorption/ionization mass spectrometry of biomolecules
  Hideya Kawasaki; Tetsu Yonezawa; Takehiro Watanabe; Ryuichi Arakawa
  JOURNAL OF PHYSICAL CHEMISTRY C, 111, 44, 16278, 16283, Nov. 2007, [Peer-reviewed]
  English, Scientific journal
• Positioning of cationic silver nanoparticle by using AFM lithography and electrostatic interaction
  Tetsu Yonezawa; Tetsuya Itoh; Naoto Shirahata; Yoshitake Masuda; Kunihito Kournoto
  APPLIED SURFACE SCIENCE, 254, 2, 621, 626, Sep. 2007, [Peer-reviewed]
  English, Scientific journal
• Fabrication of submillimeter-sized gold plates from thermal decomposition of HAuCl4 in two-component ionic liquids
  Hideya Kawasaki; Tetsu Yonezawa; Kouhei Nishimura; Ryuichi Arakawa
  CHEMISTRY LETTERS, 36, 8, 1038, 1039, Aug. 2007, [Peer-reviewed]
  English, Scientific journal
• Bio-photosensor: Cyanobacterial photosystem I coupled with transistor via molecular wire.
  Nao Terasaki; Noritaka Yamamoto; Kaoru Tamada; Mineyuki Hattori; Takashi Hiraga; Akihiko Tohri; Ikutaro Sato; Masako Iwai; Michinao Iwai; Shunpei Taguchi; Isao Enami; Yasunori Inoue; Yoshinori Yamanoi; Tetsu Yonezawa; Katsuya Mizuno; Masaki Murata; Hiroshi Nishihara; Satoshi Yoneyama; Makoto Minakata; Tsutomu Ohmori; Makoto Sakai; Masaaki Fujii
  Biochimica et biophysica acta, 1767, 6, 653, 9, Jun. 2007, [International Magazine]
  English, Scientific journal, We report on the first successful output of electrons directly from photosystem I (PSI) of thermophilic cyanobacteria to the gate of a field-effect transistor (FET) by bypassing electron flow via a newly designed molecular wire, i.e., artificial vitamin K(1), and a gold nanoparticle; in short, this newly manufactured photosensor employs a bio-functional unit as the core of the device. Photo-electrons generated by the irradiation of molecular complexes composed of reconstituted PSI on the gate were found to control the FET. This PSI-bio-photosensor can be used to interpret gradation in images. This PSI-FET system is moreover sufficiently stable for use exceeding a period of 1 year.
• Bio-photo sensor: Cyanobacterial photosystem I coupled with transistor via molecular wire
  Nao Terasaki; Noritaka Yamamoto; Kaoru Tamada; Mineyuki Hattori; Takashi Hiraga; Akihiko Tohri; Ikutaro Sato; Masako Iwai; Michinao Iwai; Shunpel Taguchi; Isao Enami; Yasunori Inoue; Yoshinori Yamanoi; Tetsu Yonezawa; Katsuya Mizuno; Masaki Murata; Hiroshi Nishihara; Satoshi Yoneyama; Makoto Minakata; Tsutomu Ohmori; Makoto Sakai; Masaaki Fujii
  BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS, 1767, 6, 653, 659, Jun. 2007, [Peer-reviewed]
  English, Scientific journal
• Preparation of Metal Nanoparticles and Their Immobilization
  YONEZAWA Tetsu
  日本写真学会誌 = Journal of The Society of Photographic Science and Technology of Japan, 70, 1, 26, 29, 日本写真学会, 2007, [Invited]
  Japanese, Scientific journal
• Synthesis of nano-sized Ag metal particles protected by adsorbed 3-mercapto-propionic acid
  Masanori Tomonari; Hilo Sadohara; Tetsu Yonezawa; Kohsuke Mori; Hiromi Yamashita
  JOURNAL OF CERAMIC PROCESSING RESEARCH, 8, 3, 195, 198, 2007, [Peer-reviewed]
  English, Scientific journal
• Trial of functionalization of silicon tip surface by Si-C bonding
  Tetsu Yonezawa; Naoto Shirahata; Yoshiko Miura
  TRANSACTIONS OF THE MATERIALS RESEARCH SOCIETY OF JAPAN, VOL 32, NO 3, 32, 3, 767, 768, 2007, [Peer-reviewed]
  English, International conference proceedings
• Preparation and characterization of polypeptide-stabilized gold nanoparticles
  Tetsu Yonezawa; Takashi Nomura; Takatoshi Kinoshita; Kunihito Koumoto
  JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 6, 6, 1649, 1654, Jun. 2006, [Peer-reviewed]
  English, Scientific journal
• An efficient matrix that resists the nonspecific adsorption of protein to fabricate carbohydrate arrays on silicon
  N Shirahata; A Hozumi; Y Miura; K Kobayashi; Y Sakka; T Yonezawa
  THIN SOLID FILMS, 499, 1-2, 213, 218, Mar. 2006, [Peer-reviewed]
  English, Scientific journal
• Hydrogen storage properties of isocyanide-stabilized palladium nanoparticles
  Shintaro Horinouchi; Yoshinori Yamanoi; Tetsu Yonezawa; Toshihiro Mouri; Hiroshi Nishihara
  Langmuir, 22, 4, 1880, 1884, 14 Feb. 2006, [Peer-reviewed]
  English, Scientific journal
• Synthesis, single crystal X-ray analysis, and TEM for a single-sized Au-11 cluster stabilized by SR ligands: The interface between molecules and particles
  K Nunokawa; S Onaka; M Ito; M Horibe; T Yonezawa; H Nishihara; T Ozeki; H Chiba; S Watase; M Nakamoto
  JOURNAL OF ORGANOMETALLIC CHEMISTRY, 691, 4, 638, 642, Feb. 2006, [Peer-reviewed]
  English, Scientific journal
• Wet synthesis of first transition metal nano-particles
  Keigo Kamoshita; Tetsu Yonezawa; Masayoshi Tanaka; Takatoshi Kinoahita
  Polymer Preprints, Japan, 55, 1, 1300, 2006
  Japanese, International conference proceedings
• Photo-assisted immobilization of gold nanoparticles on silicon substrate
  Tetsu Yonezawa; Naoto Shirahata; Nao Terasaki; Yoshinori Yamanoi; Hiroshi Nishihara
  Polymer Preprints, Japan, 55, 1, 1309, 2006
  International conference proceedings
• Structural analysis of silicon(111) surface immobilized by alkenylbenzenethiolato-protected gold nanoparticles
  Kazuki Uchida; Shintaro Horinouchi; Yoshinori Yamanoi; Tetsu Yonezawa; Hiroshi Nishihara; Nao Terasaki
  Polymer Preprints, Japan, 55, 2, 3490, 2006
  International conference proceedings
• Rh nanoparticles stabilized with phenylazomethine dendrimers as a catalyst for olefin hydrogenation
  Ikuse Nakamula; Yoshinori Yamanoi; Tetsu Yonezawa; Hiroshi Nishihara; Kimihisa Yamamoto
  Polymer Preprints, Japan, 55, 2, 4082, 2006
  International conference proceedings
• Detailed structural examinations of covalently immobilized gold nanoparticles onto hydrogen-terminated silicon surface
  Y Yamanoi; N Shirahata; T Yonezawa; N Terasaki; N Yamamoto; Y Matsui; K Nishio; H Masuda; Y Ikuhara; H Nishihara
  CHEMISTRY-A EUROPEAN JOURNAL, 12, 1, 314, 323, 2006, [Peer-reviewed]
  English, Scientific journal
• Wet preparation of metal nanoparticles and their two-dimensional arrangement
  Tetsu Yonezawa
  TRANSACTIONS OF THE MATERIALS RESEARCH SOCIETY OF JAPAN, VOL 31, NO 2, 31, 2, 553, 555, 2006, [Peer-reviewed]
  English, International conference proceedings
• A new 19-metal-atom cluster [(Me2PhP)10Au 12Ag7(NO3)9] with a nearly staggered-staggered M5 ring configuration
  Keiko Nunokawa; Mitsuhiro Ito; Tetsuya Sunahara; Satoru Onaka; Tomoji Ozeki; Hirokazu Chiba; Yasuhiro Funahashi; Hideki Masuda; Tetsu Yonezawa; Hiroshi Nishihara; Masami Nakamoto; Mari Yamamoto
  Dalton Transactions, 16, 2726, 2730, 21 Aug. 2005, [Peer-reviewed]
  English, Scientific journal
• Fabrication of periodic arrays of self-assembled monolayer by droplet-method
  Naoto Shirahata; Tetsu Yonezawa; Atsushi Hozumi; Yoshio Sakka
  Polymer Preprints, Japan, 54, 1, 886, 2005
  Japanese, International conference proceedings
• Liquid-phase synthesis of monodispersed Cu ultrafine particles - Effects of addition of protective agents on their particle size and crystallinity
  Masanori Tomonari; Yoshiyuki Kunifusa; Tetsu Yonezawa
  Polymer Preprints, Japan, 54, 1, 958, 2005
  Japanese, International conference proceedings
• Self-assembled structure of peptide-Au nanoparticle mixed cast film
  Akihiro Miyata; Tetsu Yonezawa; Masayoshi Tanaka; Takatoshi Kinoshita
  Polymer Preprints, Japan, 54, 1, 1151, 2005
  Japanese, International conference proceedings
• Preparation of matal nanoparticles from insoluble salts
  Tetsu Yonezawa; Masanori Tomonari; Yoshiyuki Kunifusa
  Polymer Preprints, Japan, 54, 2, 3002, 3003, 2005
  Japanese, International conference proceedings
• Wet Preparation of Metal Nanoparticles and Their Structure Characterization, and Technology of Their Painting and Immobilization
  YONEZAWA Tetsu
  Jitsumu Hyomen Gijutsu, 56, 12, 743, 747, The Surface Finishing Society of Japan, 2005, [Invited]
  Japanese, Scientific journal
• Immobilization of gold nanoparticles onto semiconductor surface
  Yoshinori Yamanoi; Shintaro Horinouchi; Kazuki Uchida; Tetsu Yonezawa; Hirishi Nishihara; Naoto Shirahata; Nao Terasaki; Noritaka Yamamoto; Yoshitaka Matusi; Kazuyuki Nishio; Hideki Masuda; Yuichi Ikuhara
  Polymer Preprints, Japan, 54, 2, 3541, 2005
  International conference proceedings
• Detailed structure observation of gold nanopracticles immobilized on silicon surface
  Tetsu Yonezawa; Yoshinori Yamanoi; Hiroshi Nishihara; Nao Terasaki; Noritaka Yamamoto; Naoto Shirahata
  Polymer Preprints, Japan, 54, 1, 965, 2005
  International conference proceedings
• Monolayer-derivative functionalization of non-oxidized silicon surfaces
  N Shirahata; A Hozumi; T Yonezawa
  CHEMICAL RECORD, 5, 3, 145, 159, 2005, [Peer-reviewed]
  English, Scientific journal
• Non-equilibrium structures of a-helix rod type hydrophobic polypeptide molecules on mica surfaces
  Tetsu Yonezawa; Akihiro Miyata; Masayoshi Tanaka; Takatoshi Kinoshita
  Transactions of the Materials Research Society of Japan, Vol 30, No 4, 30, 4, 1259, 1261, 2005, [Peer-reviewed]
  English, International conference proceedings
• Synthesis of.surfactant-stabilized Co/Au bimetallic nanoparticles with a core-shell structure
  Tetsu Yonezawa; Kazuhiko Shibuya; Hiroshi Nishihara
  Transactions of the Materials Research Society of Japan, Vol 30, No 4, 30, 4, 1255, 1257, 2005, [Peer-reviewed]
  English, International conference proceedings
• Interfacial observation of an alkylsilane self-assembled monolayer on hydrogen-terminated Si
  N Shirahata; WS Seo; T Kinoshita; T Yonezawa; A Hozumi; Y Yokogawa; T Kameyama; Y Masuda; K Koumoto
  LANGMUIR, 20, 20, 8942, 8946, Sep. 2004, [Peer-reviewed]
  English, Scientific journal
• Observation of selenium-77 nuclear magnetic resonance in octaneselenol-protected gold nanoparticles
  Brian S. Zelakiewicz; Tetsu Yonezawa; YuYe Tong
  Journal of the American Chemical Society, 126, 26, 8112, 8113, 07 Jul. 2004, [Peer-reviewed]
  English, Scientific journal
• Photoinduced cleavage of alkyl monolayers on Si
  N Shirahata; T Yonezawa; WS Seo; K Koumoto
  LANGMUIR, 20, 4, 1517, 1520, Feb. 2004, [Peer-reviewed]
  English, Scientific journal
• Immobilization of gold nanoparticles onto silicon surfaces by Si-C covalent bonds
  Y Yamanoi; T Yonezawa; N Shirahata; H Nishihara
  LANGMUIR, 20, 4, 1054, 1056, Feb. 2004, [Peer-reviewed]
  English, Scientific journal
• Atomic scale flattening of organosilane self-assembled monolayer and patterned tin hydroxide thin films
  N Shirahata; Y Masuda; T Yonezawa; K Koumoto
  JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 24, 2, 427, 434, 2004, [Peer-reviewed]
  English, Scientific journal
• Patterned adsorption of protein onto a carbohydrate monolayer immobilized on Si
  N Shirahata; T Yonezawa; Y Miura; K Kobayashi; K Koumoto
  LANGMUIR, 19, 22, 9107, 9109, Oct. 2003, [Peer-reviewed]
  English, Scientific journal
• Preparation of SrTiO3 thin films by the liquid phase deposition method
  Yanfeng Gao; Yoshitake Masuda; Tetsu Yonezawa; Kunihito Koumoto
  Materials Science and Engineering B: Solid-State Materials for Advanced Technology, 99, 1-3, 290, 293, 25 May 2003, [Peer-reviewed]
  English, International conference proceedings
• Room temperature deposition of a TiO2 thin film from aqueous peroxotitanate solution
  Yanfeng Gao; Yoshitake Masuda; Zifei Peng; Tetsu Yonezawa; Kunihito Koumoto
  Journal of Materials Chemistry, 13, 3, 608, 613, 01 Mar. 2003, [Peer-reviewed]
  English, Scientific journal
• Cationic silver nanoparticles dispersed in water prepared from insoluble salts
  Tetsu Yonezawa; Hideo Genda; Kunihito Koumoto
  Chemistry Letters, 32, 2, 194, 195, 05 Feb. 2003, [Peer-reviewed]
  English, Scientific journal
• Investigation of apatite deposition onto charged surfaces in aqueous solutions using a quartz-crystal microbalance
  Peixin Zhu; Yoshitake Masuda; Tetsu Yonezawa; Kunihito Koumoto
  Journal of the American Ceramic Society, 86, 5, 782, 790, American Ceramic Society, 2003, [Peer-reviewed]
  English, Scientific journal
• Site-selective deposition and micropatterning of SrTiO3 thin film on self-assembled monolayers by the liquid phase deposition method
  Yanfeng Gao; Yoshitake Masuda; Tetsu Yonezawa; Kunihito Koumoto
  Chemistry of Materials, 14, 12, 5006, 5014, 01 Dec. 2002, [Peer-reviewed]
  English, Scientific journal
• Control over film thickness of SnO2 ultrathin film selectively deposited on a patterned self-assembled monolayer
  N Shirahata; Y Masuda; T Yonezawa; K Koumoto
  LANGMUIR, 18, 26, 10379, 10385, Dec. 2002, [Peer-reviewed]
  English, Scientific journal
• Thermoelectric properties of textured ceramics of co-containing layer structured oxide
  Nagahama, D.; Masuda, Y.; Yonezawa, T.; Koumoto, K.
  Key Engineering Materials, 228-229, 2002, [Peer-reviewed]
  Scientific journal
• Thermoelectric properties of Ca3Co4O9-based ceramics textured by templated grain growth method
  Nagahama, D; Tani, T; Masuda, Y; Itahara, H; Yonezawa, T; Koumoto, K; IEEE
  Xxi International Conference on Thermoelectrics, Proceedings Ict '02, 2002-, 211, 214, 2002, [Peer-reviewed]
  English, Scientific journal
• Site-selective deposition of TiO2 thin films using self-assembled monolayers and their dielectric properties
  Masuda, Y.; Wang, D.; Yonezawa, T.; Koumoto, K.
  Key Engineering Materials, 228-229, 2002, [Peer-reviewed]
  Scientific journal
• Templated site-selective deposition of titanium dioxide on self-assembled monolayers
  Masuda, Y.; Jinbo, Y.; Yonezawa, T.; Koumoto, K.
  Chemistry of Materials, 14, 3, 1236, 1241, 2002, [Peer-reviewed]
  English, Scientific journal
• Low-dimensional arrangement of SiO2 particles
  Masuda, Y.; Itoh, M.; Yonezawa, T.; Koumoto, K.
  Langmuir, 18, 10, 4155, 4159, 2002, [Peer-reviewed]
  English, Scientific journal
• Site-selective deposition and micropatterning of zirconia thin films on templates of self-assembled monolayers
  Yanfeng Gao; Yoshitake Masuda; Tetsu Yonezawa; Kunihito Koumoto
  Journal of the Ceramic Society of Japan, 110, 1281, 379, 385, Ceramic Society of Japan, 2002, [Peer-reviewed]
  English, Scientific journal
• Chemical Modification of Metal Nanoparticles and Their Assembly Formation
  YONEZAWA Tetsu
  Kobunshi, 50, 4, 262, 262, The Society of Polymer Science, Japan, 01 Apr. 2001
  Japanese
• Three-dimensional assembly of cationic gold nanoparticles and anionic organic components: DNA and a bilayer membrane
  Tetsu Yonezawa; Shin-ya Onoue; Toyoki Kunitake
  Studies in Surface Science and Catalysis, 132, 623, 626, Elsevier Inc., 2001
  English, International conference proceedings
• Preparation of ultrathin films filled with gold nanoparticles through layer-by-layer assembly with polyions
  Tetsu Yonezawa; Hiroto Shimokawa; Mizuki Sutoh; Shin-ya Onoue; Toyoki Kunitake
  Studies in Surface Science and Catalysis, 132, 619, 622, Elsevier Inc., 2001
  English, International conference proceedings
• Two-dimensional patterning of nanoparticles using dissipative structures
  T. Sawadaishi; K. Ijiro; M. Shimomura; Y. Shiraishi; N. Toshima; T. Yonezawa; T. Kunitake
  MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 371, 123, 126, 2001, [Peer-reviewed]
• Practical preparation of anionic mercapto ligand-stabilized gold nanoparticles and their immobilization
  Tetsu Yonezawa; Toyoki Kunitake
  Colloids and Surfaces A: Physicochemical and Engineering Aspects, 149, 1-3, 193, 199, Elsevier Science Publishers B.V., 15 Apr. 1999, [Peer-reviewed]
  English, International conference proceedings
• Layered nanocomposite of close-packed gold nanoparticles and TiO2 gel layers
  Tetsu Yonezawa; Hideki Matsune; Toyoki Kunitake
  Chemistry of Materials, 11, 1, 33, 35, American Chemical Society, 1999
  English, Scientific journal
• Visualized Polymers. Patterns Formed by Polymeric Systems. II. Formation of One-Dimensional Arrays of Gold Nanoparticles with DNA.
  YONEZAWA Tetsu; ONOUE Shin-ya; KUNITAKE Toyoki
  Kobunshi Kagaku, 56, 12, 855, 859, The Society of Polymer Science, Japan, 1999
  Japanese, A close-packed one-dimensional array of gold nanoparticles was prepared with DNA as a rigid anionic polymer template. Gold nanoparticles with dense positive charges were prepared by modifying with dialkylammonium-disulfide. These cationic gold nanoparticles were adsorbed effectively on anionic DNA molecules. Electron microscopy indicated that the particle array had a close-packed structure with a small inter-particle distance. The formation mechanism of the close packing is discussed.
• Preparation of cationic gold nanoparticles and their monolayer formation on an anionic amphiphile layer
  Tetsu Yonezawa; Shin-Ya Onoue; Toyoki Kunitake
  Chemistry Letters, 10, 1061, 1062, Chemical Society of Japan, 1999, [Peer-reviewed]
  English, Scientific journal
• Growth of closely packed layers of gold nanoparticles on an aligned ammonium surface
  Tetsu Yonezawa; Shin-Ya Onoue; Toyoki Kunitake
  Advanced Materials, 10, 5, 414, 416, Wiley-VCH Verlag, 23 Mar. 1998
  English, Scientific journal
• Formation of ordered monolayer of anionic silica particles on a cationic molecular layer
  Tetsu Yonezawa; Shin-Ya Onoue; Toyoki Kunitake
  Chemistry Letters, 7, 689, 690, Chemical Society of Japan, 1998, [Peer-reviewed]
  English, Scientific journal
• Practical preparation of size-controlled gold nanoparticles in water
  Tetsu Yonezawa; Mizuki Sutoh; Toyoki Kunitake
  Chemistry Letters, 7, 619, 620, Chemical Society of Japan, 1997, [Peer-reviewed]
  English, Scientific journal
• Stabilizing structure of tertiary amine-protected rhodium colloid dispersions in chloroform
  Tetsu Yonezawa; Toshihiro Tominaga; Dominique Richard
  Journal of the Chemical Society - Dalton Transactions, 5, 783, 789, Royal Society of Chemistry, 07 Mar. 1996
  English, Scientific journal
• Photosensitized Reduction of Carbon Dioxide in Solution Using Noble-Metal Clusters for Electron Transfer
  Naoki Toshima; Yumi Yamaji; Toshiharu Teranishi; Tetsu Yonezawa
  Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences, 50, 2-3, 283, 291, 01 Mar. 1995, [Peer-reviewed]
  English, Scientific journal
• 両親媒性分子の作る組織場中の金属超微粒子
  米澤 徹; 戸嶋 直樹
  高分子論文集, 52, 12, 809, 820, 高分子学会, 1995, [Peer-reviewed]
  Japanese, Scientific journal
• Metal clusters in organized media composed of amphiphilic molecules
  T Yonezawa; N Toshima
  KOBUNSHI RONBUNSHU, 52, 12, 809, 820, 1995, [Peer-reviewed]
  Japanese, Scientific journal
• Protecting structure model for nanoscopic platinum clusters protected by non-ionic surfactants: 13C nuclear magnetic resonance investigation
  Tetsu Yonezawa; Yaeko Gotoh; Naoki Toshima
  Reactive Polymers, 23, 2-3, 43, 51, 1994, [Peer-reviewed]
  English, Scientific journal
• THE POLYMER-PROTECTED PD-PT BIMETALLIC CLUSTERS HAVING CATALYTIC ACTIVITY FOR SELECTIVE HYDROGENATION OF DIENE - PREPARATION AND EXAFS INVESTIGATION ON THE STRUCTURE
  N TOSHIMA; T YONEZAWA; M HARADA; K ASAKURA; Y IWASAWA
  CHEMISTRY LETTERS, 5, 815, 818, May 1990, [Peer-reviewed]
  English, Scientific journal
• COLLOIDAL DISPERSIONS OF PALLADIUM-PLATINUM BIMETALLIC CLUSTERS PROTECTED BY POLYMERS - PREPARATION AND APPLICATION TO CATALYSIS
  N TOSHIMA; K KUSHIHASHI; T YONEZAWA; H HIRAI
  CHEMISTRY LETTERS, 10, 1769, 1772, Oct. 1989, [Peer-reviewed]
  English, Scientific journal

• Formation scheme of ZnTe microspheres via hot injection method
  Yuen-ting Rachel Chau; Mai Thanh Nguyen; Yonezawa Tetsu, Colloid & Interface Communications, 48, 3, 15, 18, 2023, [Invited]
  English
• 金属ナノ粒子・微粒子の合成と回収の決め手
  米澤 徹, 日本ディスパージョンセンター技術研究会, May 2022, [Invited], [Lead author, Last author, Corresponding author]
  Japanese, Lecture materials
• Fabrication of Copper Fine Particles for Conductive Inks and Pastes Sintered at Low Temperatures
  米澤徹, ナノ学会会報, 19, 2, Mar. 2022, [Invited]
  Japanese, Introduction scientific journal
• 酸化グラフェン(GO)上におけるFe-Co-Ni合金ナノ粒子の化学合成
  新開裕二; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2021 (CD-ROM), 2022, [Last author, Corresponding author]
• 画像誘導放射線治療に用いるフィデューシャルマーカーのためのRFプラズマを用いた金ナノ粒子の合成
  古岡昂真; LIU Haoran; 宮本直樹; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2021 (CD-ROM), 2022, [Last author, Corresponding author]
• バインダー利用によるα-MnO₂ベース亜鉛イオン電池の性能向上
  村松樹; KHEAWHOM Soorathep; NGUYEN Mai Thanh; 米澤徹, 応用物理学会北海道支部/日本光学会北海道支部合同学術講演会講演予稿集, 56th-17th (CD-ROM), 2021
• Manipulation of Two-Dimensional Supramolecular Assembly via Multiple Electrostatic Interaction and Its Direct Imaging by Electron Microscopy
  石田洋平; 秋田郁美; 米澤徹, ナノ学会大会講演予稿集, 19th, 2021
• Cationization of Neutral Ligands on Au₂₅ Cluster Surface Through Menshutkin Reaction
  成田国広; 石田洋平; 米澤徹, ナノ学会大会講演予稿集, 19th, 2021
• York-shell type micro-capsules for moderate-temperature heat transfer
  米澤徹, 岩谷直治記念財団研究報告書, 44, 2021
• さまざまな機能を生み出す粒ぞろいな粒子たち 導電性・熱伝導性ペーストに向けた金属微粒子・ナノ粒子
  米澤徹, 粉体技術, 13, 12, 2021
• 多重静電相互作用による二次元分子配列制御と電子顕微鏡による可視化
  石田洋平; 秋田郁美; 米澤徹, 日本顕微鏡学会北海道支部学術講演会講演要旨集, 2021 (CD-ROM), 2021
• 溶融塩還元による磁性体金属ナノ粒子の合成
  高橋悠太; NGUYEN Thanh Mai; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2019, 2020
• Atomic scale imaging of a free-standing monolayer clay mineral nanosheet by aberration corrected scanning transmission electron microscopy
  石田洋平; 秋田郁美; 米澤徹, 日本化学会春季年会講演予稿集(CD-ROM), 100th, 2020
• Atomic Scale Imaging of Free-standing Monolayer Clay Mineral Nanosheet and Remarkable Stability under Electron Beam Irradiation
  秋田郁美; 石田洋平; 米澤徹, ナノ学会会報, 19, 1, 2020
• 低温焼成システム構築に向けたCuOx微酸化物系の構築
  米澤徹; 塚本宏樹, マイクロエレクトロニクスシンポジウム論文集, 29th, 2019
• 低温でのCaH₂還元による磁性体FeNiナノ粒子の合成
  高橋悠太; NGUYEN Thanh Mai; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2018, 2019
• リガンド交換反応による超迅速なカチオン性金ナノ粒子分散液の合成
  鈴木潤; 石田洋平; 米澤徹, 日本化学会春季年会講演予稿集(CD-ROM), 99th, 2019
• Free-standing粘土鉱物ナノシートの収差補正ADF-STEM観察
  秋田郁美; 石田洋平; 米澤徹, 日本顕微鏡学会北海道支部学術講演会講演要旨集, 2019, 2019
• 導電性部材などに向けた低温焼成新規銅微粒子システム
  米澤徹; 塚本宏樹, 高分子学会予稿集(CD-ROM), 67, 2, 2018
• リガンド交換法による超迅速なカチオン性金ナノ粒子合成手法の開拓
  鈴木潤; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2017, 2018
• マイクロ波液中プラズマ法を利用した黒色酸化チタンナノ粒子の合成と光触媒活性評価
  松本大地; 石田洋平; 塚本宏樹; 徳永智春; 米澤徹, 化学系学協会北海道支部冬季研究発表会(Web), 2018, 2018
• スパッタリング法による特異な発光特性を有するカチオン性金属/合金ナノ粒子の合成
  秋田郁美; RYAN Corpuz D.; 石田洋平; 米澤徹, 日本化学会春季年会講演予稿集(CD-ROM), 98th, 2018
• スパッタリング法によるカチオン性金ナノ粒子の合成及びサイズ分画による金コアの構造と発光メカニズムの調査
  森田晃広; 石田洋平; 米澤徹; 徳永智春, 日本化学会春季年会講演予稿集(CD-ROM), 98th, 2018
• アニオン性粘土ナノシートをホストとする量子ドット集合構造内での励起エネルギー伝達反応系の実空間解析
  秋田郁美; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2018, 2018
• スパッタリング法で合成したカチオン性金ナノ粒子の発光特性および金コア構造の調査
  森田晃広; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2018, 2018
• 半導体ナノ粒子-ナノシート集合系で進行する励起エネルギー移動反応の電子線トモグラフィ解析
  石田洋平; 秋田郁美; 米澤徹, 日本化学会春季年会講演予稿集(CD-ROM), 98th, 2018
• 粘土鉱物ナノシートのHAADF-STEM観察
  秋田郁美; 石田洋平; 米澤徹, 日本顕微鏡学会北海道支部学術講演会講演要旨集, 2018, 2018
• PEのタネ 低温焼成銅微粒子システム~PEへの応用を目指して~
  塚本宏樹; 米澤徹, コンバーテック, 45, 4, 48‐51, 51, 15 Apr. 2017
  加工技術研究会, Japanese
• 未来を拓く分散・凝集技術 金属ナノ粒子・微粒子の電子部品部材への応用
  米澤徹; 松原正樹, ケミカルエンジニヤリング, 62, 8, 2017
• 物理的手法で合成したチオラート保護金ナノ粒子のユニークな発光特性と二次凝集構造
  秋田郁美; 石田洋平; 米澤徹, 日本化学会春季年会講演予稿集(CD-ROM), 97th, 2017
• スパッタリング法により合成した金ナノ粒子の発光起源の解明
  石田洋平; 秋田郁美; 米澤徹, 光化学討論会要旨集(CD-ROM), 2017, 2017
• アニオン性粘土ナノシート-カチオン性量子ドット集合構造内での励起エネルギー伝達反応系の電子線トモグラフィ解析
  秋田郁美; 石田洋平; 米澤徹, 粘土科学討論会講演要旨集, 61st, 2017
• スパッタリング法によるカチオン性チオラート保護蛍光性金ナノ粒子の合成及びサイズ分画
  森田晃広; 石田洋平; 米澤徹, 日本金属学会講演概要(CD-ROM), 161st, 2017
• 液中プラズマ法を用いた光触媒酸化チタンナノ粒子の合成
  松本大地; 石田洋平; 徳永智春; 塚本宏樹; 米澤徹, 日本金属学会講演概要(CD-ROM), 161st, 2017
• マイクロ波液中プラズマ法により合成された黒色酸化チタンナノ粒子の構造解析
  松本大地; 石田洋平; 塚本宏樹; 米澤徹; 徳永智春, ナノ学会大会講演予稿集, 15th, 2017
• 量子ドット集合組織内励起エネルギー伝達反応の電子線トモグラフィによる実空間解析
  秋田郁美; 石田洋平; 米澤徹, ナノ学会大会講演予稿集, 15th, 2017
• スパッタリング法によるカチオン性チオラート保護金ナノ粒子の合成と発光特性
  森田晃広; 石田洋平; 米澤徹, ナノ学会大会講演予稿集, 15th, 2017
• Unique Fluorescent Nano-Fluids Prepared by a Matrix Sputtering Method
  石田 洋平; 米澤 徹, 化学工学, 80, 3, 156, 159, Mar. 2016
  化学工学会, Japanese
• 金属スズ微粒子の合成と低温焼結性能
  米澤徹; 白井宏明; 石田洋平; NGUYEN Mai Thanh, Symposium on Microjoining and Assembly Technology in Electronics, 22nd, 2016
• 液中プラズマ法による酸化チタンナノ粒子の可視光応答性光触媒への改質
  石田洋平; 元兼康智; 米澤徹; 徳永智春, 日本化学会春季年会講演予稿集(CD-ROM), 96th, 2016
• マイクロ波液中プラズマ法による黒色酸化チタンナノ粒子の合成
  松本大地; 石田洋平; 塚本宏樹; 徳永智春; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2016, 2016
• マトリクススパッタリング法による特異な蛍光性金ナノ粒子生成メカニズムの解明
  秋田郁美; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2016, 2016
• 硬磁性材料獲得へ向けたFe₅₀Ni₅₀合金ナノ粒子の液相合成
  蓑島嵩人; NGUYEN Thanh Mai; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2016, 2016
• 酸化チタンナノ粒子へのプラズマ処理による簡便な可視光応答化技術の開発
  石田洋平; 元兼康智; 米澤徹; 徳永智春, 日本化学会春季年会講演予稿集(CD-ROM), 96th, 2016
• 液中プラズマを用いた金属酸化物の合成
  米澤徹; 塚本宏樹; 本野真梧; 道心渉; 石田洋平; 徳永智春, 日本化学会春季年会講演予稿集(CD-ROM), 96th, 2016
• 異なるチオール配位子で保護された銀ナノ粒子のマトリクススパッタリング合成
  中林良太; 石田洋平; 米澤徹, 化学系学協会北海道支部冬季研究発表会講演要旨集(CD-ROM), 2016, 2016
• PVP保護金属スズナノ粒子の化学合成と室温焼結
  白井宏明; NGUYEN Thanh Mai; 石田洋平; 米澤徹, 化学系学協会北海道支部冬季研究発表会講演要旨集(CD-ROM), 2016, 2016
• 酸分解性ポリマー保護銅微粒子の低温焼結
  蓑島嵩人; 松原正樹; 塚本宏樹; 田中洋己; 岡本和樹; 尾坂拓也; 米澤徹, 高分子学会予稿集(CD-ROM), 64, 1, ROMBUNNO.2F06, 12 May 2015
  Japanese
• 低温焼結性高分子保護銅微粒子の焼結時の構造変化
  米澤徹; 松原正樹; 塚本宏樹, 高分子学会予稿集(CD-ROM), 64, 1, ROMBUNNO.2F04, 12 May 2015
  Japanese
• 非酸化性高分子保護銅微粒子の低温二段焼成
  松原正樹; 塚本宏樹; 米澤徹, ナノ学会大会講演予稿集, 13th, 55, 11 May 2015
  Japanese
• アミン保護銅微粒子の二段焼成における酸化挙動
  松原正樹; YONG Yingqiong; 塚本宏樹; 米澤徹, ナノ学会大会講演予稿集, 13th, 56, 11 May 2015
  Japanese
• 低温焼結に向けた銅微粒子の合成と焼結手法
  米澤徹; 塚本宏樹; 松原正樹, 化学工学会年会研究発表講演要旨集(CD-ROM), 80th, ROMBUNNO.V201, 19 Mar. 2015
  Japanese
• リポ酸を保護剤とするCuナノ粒子の合成と蛍光特性
  千葉仁嗣; NGUYEN Thanh Mai; 石田洋平; 米澤徹, 応用物理学会北海道支部・日本光学会北海道地区合同学術講演会講演予稿集, 50th-11th, 2015
• チオール配位子に保護された銀ナノ粒子のマトリクススパッタリング合成
  中林良太; 石田洋平; 米澤徹, 応用物理学会北海道支部・日本光学会北海道地区合同学術講演会講演予稿集, 50th-11th, 2015
• マトリクススパッタリング法によって合成した蛍光性銀ナノ粒子
  中林良太; 石田洋平; 米澤徹, 日本化学会講演予稿集, 95th, 3, 2015
• 酸化チタンナノ粒子の液中プラズマによる酸素欠損形成
  米澤徹; 元兼康智; 徳永智春; 石田洋平, 日本化学会講演予稿集, 95th, 3, 2015
• ポリエチレングリコール中へのスパッタリングによる銀ナノ粒子の合成
  中林良太; 石田洋平; 米澤徹, 高分子学会予稿集(CD-ROM), 64, 1, 2015
• 液中プラズマ法による酸化チタンナノ粒子の改質
  元兼康智; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2015, 2015
• 水溶性チタン錯体への液中プラズマによる酸化チタンナノ粒子の新規合成法
  道心渉; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同冬季講演大会概要集, 2014, 2015
• マトリクススパッタリング法に有機配位子を共存させた発光性金ナノ粒子合成
  石田洋平; 鷲見太希; 米澤徹, 日本化学会講演予稿集, 95th, 3, 2015
• 液体高分子内に取り込まれた発光性金ナノ粒子の物性
  米澤徹; 石田洋平, 高分子学会予稿集(CD-ROM), 64, 2, 2015
• メルカプト分子共存下におけるマトリクススパッタリングによる蛍光性金ナノ粒子の合成
  米澤徹; 鷲見太希; 本野真梧; 石田洋平; 白幡直人, 高分子学会予稿集(CD-ROM), 64, 1, 2015
• マイクロ波液中プラズマ法を用いた酸化チタンナノ粒子改質による可視光吸収
  元兼康智; 石田洋平; 米澤徹, 日本顕微鏡学会北海道支部学術講演会講演要旨集, 2015, 2015
• 高分子に保護された金属微粒子の合成と焼結
  米澤徹; 塚本宏樹; 松原正樹, 高分子学会予稿集(CD-ROM), 63, 2, ROMBUNNO.3S09, 03 Sep. 2014
  Japanese
• 金属ナノ粒子の形状変化の高温その場TEM観察
  成島 隆; 米澤 徹, 顕微鏡, 49, 2, 88, 92, Sep. 2014, [Peer-reviewed]
  Japanese, Introduction scientific journal
• Stable Metal Nanoparticles-Preparation and Dispersion from the Point of View of Colloid Chemistry
  米澤 徹, 塗装工学, 49, 2, 42, 50, 2014
  日本塗装技術協会, Japanese
• 保護剤混合PEG中にスパッタリングで合成する蛍光性金ナノ粒子
  鷲見太希; 石田洋平; 米澤徹, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 75th, 2014
• マトリクススパッタリング法を用いたシングルナノレベルの銀ナノ粒子の合成
  中林良太; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2014, 2014
• 液中プラズマ法による酸化チタンナノ粒子の性質変化
  元兼康智; 石田洋平; 米澤徹; 徳永智春; 大谷文章, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2014, 2014
• 保護剤混合PEGを用いたマトリクススパッタリングによる金ナノ粒子の粒子径制御
  鷲見太希; 石田洋平; 米澤徹, 日本鉄鋼協会日本金属学会両支部合同サマーセッション概要集, 2014, 2014
• マイクロ波液中プラズマ法を用いる酸化チタンナノ粒子の物性制御
  元兼康智; 石田洋平; 米澤徹; 徳永智春; 大谷文章, 日本金属学会講演概要(CD-ROM), 155th, 2014
• Effect of silver nanoparticles on cells : Comparison between 2 and 3 dimension culture systems
  HASHIMOTO M; TOSHIMA H; YONEZAWA T; KAWAI K; KAGA M; ENDO K, The journal of the Japanese Society for Dental Materials and Devices, 32, 2, 86, 86, 25 Mar. 2013
  This study evaluated biological responses of cultured murine macrophages (RAW264.7) to PVP-coated silver nanoparticles (nAg-PVP) using assay of WST-8, LDH release, RT-qPCR, and morphological analyses. Cell culture was conducted using traditional two-dimensional culture (2D) and three-dimensional spheroid culture system (3D). The NPs were taken up by receptor-mediated endocytosis, in which particles aggregated in the vesicles. Cell spheroid formation was obviously observed after 4 and s days culture. The cytotoxic effects of cells in 3D were lower than that in 2D., The Japanese Society for Dental Materials and Devices (JSDMD), Japanese
• 溶液合成した前駆体のMoS₂への変化過程
  島田敏宏; 橋本遊; 柳瀬隆; 長浜太郎; 米澤徹, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 60th, ROMBUNNO.27P-G12-5, 11 Mar. 2013
  Japanese
• SEM observation of biological samples using room temperature ionic liquids
  ABE SHIGEAKI; HYONO ATSUSHI; AKASAKA TSUKASA; WATARI FUMIO; YONEZAWA TETSU, 日本歯科理工学会誌, 31, 5, 442, 442, 25 Sep. 2012
  Ionic liquid is a kind of salt as a liquid even at room temperature. Because of their unique properties such as fluidity, high ionic conductivity and negligible vapor pressure, they have been attention for widely applications even under vacuum conditions. In this study, we investigated the ionic liquid for SEM pretreatment of several biomaterials. With regard to IL coating on the sample surface, we succeeded in high-quality observation of biomaterials. In addition, we also succeeded in applying the IL preparation to SEM-EDS measurement. These results suggested that this simple and rapid conductivity preparation for SEM observation., The Japanese Society for Dental Materials and Devices (JSDMD), Japanese
• Effect of water-dispersible metal-based nanoparticles on macrophages
  HASHIMOTO MASANORI; TOSHIMA HIROKAZU; YONEZAWA TETSU; KAWAI KOJI; KAWAI KOJI; KAGA MASAYUKI; ENDO KAZUHIKO, 日本歯科理工学会誌, 31, 5, 356, 356, 25 Sep. 2012
  This study evaluated biological responses of water-dispersible gold (Au-NPs) and silver nanoparticles (Ag-NPs) stabilized by metal-C σ-bonds in cultured murine macrophages (RAW264.7) using assay of cell viability, LDH release, RT-qPCR, and morphological analyses. These results suggested that the Ag-NPs showed cytotoxicity that depended on the NP concentration. In contrast, no cytotoxic effects were observed in the Au-NPs. The expression level of IL-1α was increased after Au- and Ag-NP exposure. The NPs were taken up with minor cell morphological changes for Au-NPs compared to Ag-NPs, in which particles aggregated in the vesicles. The cell endocytosis may induce harmful effects due to expansion of cell vesicles after Ag-NP exposure., The Japanese Society for Dental Materials and Devices (JSDMD), Japanese
• マイクロウェーブポリオール法による約2nmサイズの銅ナノ粒子の合成
  川崎英也; 明神雄揮; 成島隆; 米澤徹; 荒川隆一, ナノ学会大会講演予稿集, 10th, 70, 14 Jun. 2012
  Japanese
• 生体関連分子の効率よい脱離・イオン化に向けた新規SALDI‐MSシステム
  米澤徹; 長谷川千裕; 七分勇勝; 小西克明, 高分子学会予稿集(CD−ROM), 61, 1, ROMBUNNO.3PA069, 15 May 2012
  Japanese
• サケ白子DNAをテンプレートとして用いたAgナノ粒子の調製法
  武島智美; 武島智美; 山田義久; 多田祐也; 西原雅夫; 杉正人; 西則雄; 西則雄; 米澤徹; 古月文志, 高分子学会予稿集(CD−ROM), 61, 1, ROMBUNNO.2PA069, 15 May 2012
  Japanese
• 高分子保護金属銅微粒子の生成メカニズムと表面状態
  米澤徹; 内田佳希; 成島隆, 高分子学会予稿集(CD−ROM), 61, 1, ROMBUNNO.3PB024, 15 May 2012
  Japanese
• Effect of functionalized silver nanoparticles with water-soluble monomer of cells
  HASHIMOTO MASANORI; TOSHIMA HIROKAZU; YONEZAWA TETSU; KAWAI KOJI; KAWAI KOJI; KAGA MASAYUKI; ENDO KAZUHIKO, 日本歯科理工学会誌, 31, 2, 90, 90, 25 Mar. 2012
  Silver nanoparticles are the most frequent commercialized nanomaterials for various fields due to its strong antibacterial activity. Silver nanoparticles are also attractive for dental applications because of their antimicrobial activity and cell biocompatibility. Despite their widespread application, comprehensive biologic and toxicologic information is not well documented. Therefore, the purpose of this study was to evaluate the effect of water-soluble monomer functionalized silver nanoparticles on cells (RAW264.7 and MC3T3-E1) using morphological analysis of light-microscopy, SEM and TEM, measurement of cell viability, or cytokine assay of real-time qPCR., The Japanese Society for Dental Materials and Devices (JSDMD), Japanese
• ナノ粒子の形状と配列制御
  米澤徹, 日本化学会講演予稿集, 92nd, 1, 53, 09 Mar. 2012
  Japanese
• Preparation of Substrates for Surface Assisted Laser Desorptionionization (SALDI) Using Laser Ablation in Liquids
  TSUJI Takeshi; YASUTOMO Masato; MIZUKI Takeshi; TSUJI Masaharu; KAWASAKI Hideya; YONEZAWA Tetsu; MAFUNE Fumitaka, レーザー研究, 40, 2, 111, 116, 15 Feb. 2012
  レーザー学会, Japanese
• 金属系分野における人材の育成 北海道大学における金属材料系の教育
  Toshiaki Otsuka; Ryosuke O. Suzuki; Tetsu Yonezawa, Kinzoku, 82, 1, 4, 8, Jan. 2012
  アグネ技術センター, Japanese, Introduction scientific journal
• P-46 Development of a novel SEM observation using an ionic liquid
  Abe S; Hyono A; Akasaka T; Watari F; Yonezawa T, The journal of the Japanese Society for Dental Materials and Devices, 30, 5, 349, 349, 25 Sep. 2011
  Ionic liquid is a kind of salt as a liquid even at room temperature. Because of their unique properties such as negligible vapor pressure at room temperature and high ionic conductivity, they have been attention for widely applications even under vacuum conditions. In this study, we investigated the ionic liquid for treatment of insulating SEM samples. Ionic liquid was found to put electrical conductivity to the samples similar to a metal or carbon coating., The Japanese Society for Dental Materials and Devices (JSDMD), Japanese
• 2-325 Activation of Faculty Education by Combination of Quarter System and Practice
  SUZUKI Ryosuke; OHTSUKA Toshiaki; YONEZAWA Tetsu; HAYASHI Shigenari; OHNO Munekazu; UEDA Mikito, 工学教育研究講演会講演論文集, 23, 59, 526, 527, 22 Aug. 2011
  Japanese Society of Engineering Education, Japanese
• Si表面修飾の最適化によるDBTTF薄膜の成長制御
  土田裕也; 大伴真名歩; 長浜太郎; 米沢徹; 島田敏宏, 応用物理学会学術講演会講演予稿集(CD-ROM), 72nd, ROMBUNNO.30A-V-9, 16 Aug. 2011
  Japanese
• 電気化学的還元によるグラファイト上でのグラフェンエッジの作製
  久保田翔生; 長浜太郎; 米澤徹; 島田敏宏, 応用物理学会学術講演会講演予稿集(CD-ROM), 72nd, ROMBUNNO.30P-ZT-1, 16 Aug. 2011
  Japanese
• ナノ物質の体内循環挙動の追跡とその生体親和性
  阿部薫明; 岩寺信喜; 伊藤佐智子; 赤坂司; 宇尾基弘; 八若保孝; 高田知哉; 米澤徹; 亘理文夫, ナノ学会大会講演予稿集, 9th, 2011
• Internal distribution of micro- / Nano-sized inorganic particles and their cytocompatibility
  Shigeaki Abe; Nobuki Iwadera; Mitsue Esaki; Ikuhiro Kida; Mami Mutoh; Tsukasa Akasaka; Motohiro Uo; Yasutaka Yawaka; Manabu Morita; Koichi Haneda; Tetsu Yonezawa; Fumio Watari, IOP Conference Series: Materials Science and Engineering, 18, 13, 19201301, 2011
  English
• Preface for Special Issue on Growth and Novel Functions of Nanocrystals(Preface)
  Shimada Toshihiro; Yonezawa Tetsu, Journal of the Japanese Association of Crystal Growth, 37, 4, 265, 265, Jan. 2011
  The Japanese Association for Crystal Growth (JACG), Japanese
• A Novel Method for Microstructure Fabrication with Anodic Oxide Films
  KIKUCHI Tatsuya; SAKAIRI Masatoshi; YONEZAWA Tetsu; JHA Himendra; TAKAHASHI Hideaki, Jitsumu Hyomen Gijutsu, 61, 2, 207, 207, 2010, [Invited]
  The Surface Finishing Society of Japan, Japanese, Introduction scientific journal
• シリコン表面へのヒドロシリル化によるナノ粒子固定
  米澤 徹, コロイドアンドインターフェースコミュニケーション, 34, 3, 22, 24, Aug. 2009
  日本化学会コロイドおよび界面化学部会, Japanese
• MALDI-MS・SALDI-MS Systems to Analyze Polymer
  YONEZAWA Tetsu, Journal of Materials Life Society, 20, 3, 125, 130, 31 Oct. 2008
  マテリアルライフ学会, Japanese
• 生体系光受容体を用いた光電変換のための錯体分子連結系の構築
  宮地麻里子; 山野井慶徳; 米澤徹; 西原寛; 岩井道直; 今野雅恵; 岩井雅子; 井上康則, 錯体化学討論会講演要旨集, 58th, 353, 05 Sep. 2008
  Japanese
• 金属ナノ粒子を利用するLDI-MS
  米澤徹; 川崎英也; 樽井章; 渡辺健宏; 荒川隆一; 島田敏宏; 真船文隆, 高分子学会予稿集(CD-ROM), 57, 1 Disk1, 2008
• 金属ナノ粒子の配列・固定化と機能
  米澤 徹, 未来材料, 7, 3, 44, 49, Mar. 2007
  エヌ・ティー・エス, Japanese
• Adsorption-induced Self-fusion of Cationic Gold Nanoparticles on Tobacco Mosaic Virus (TMV)
  YONEZAWA Tetsu; ONOUE Shin-ya; KIMIZUKA Nobuo, Chemistry Letters, 34, 11, 1498, 1499, 05 Nov. 2005
  English
• Preparation and Characterization of Bio-conjugated Photosensing Nanomaterials: Synthesis of molecular wires and reconstruction of photo system I (PSI) using them
  山野井慶徳; 森山佳則; 米沢徹; 西原寛; 藤利彰彦; 佐藤幾太郎; 井上康則; 寺崎正; 山本典孝, 日本化学会講演予稿集, 85th, 1, 2005
• Preparation and Characterization of Bio-conjugated Photosensing Nanomaterials: Synthesis of molecular wires reconstruction of photo system I (PSI) using them
  山野井慶徳; 森山佳則; 米沢徹; 西原寛; 藤利彰彦; 佐藤幾太郎; 井上康則; 寺崎正; 山本典孝, 日本化学会講演予稿集, 85th, 1, 2005
• 光合成系Iに配線する分子電線の設計と合成
  山野井慶徳; 森山佳則; 米沢徹; 西原寛, 応用物理学関係連合講演会講演予稿集, 52nd, 2005
• 生体の光合成複合体に配線する人工分子電線の合成と評価
  山野井慶徳; 森山佳則; 水野克哉; 米沢徹; 西原寛, 光化学討論会講演要旨集, 2005, 2005
• 光合成システムI-ナノ粒子バイオ共役ナノマテリアルの再構成
  米沢徹; 山野井慶徳; 森山佳則; 西原寛; 藤利彰彦; 佐藤幾太郎; 井上康則; 寺崎正; 山本典孝; 玉田薫; 平賀隆; 米山賢史; 皆方誠; 大森努; 酒井誠; 藤井正明, ナノ学会大会講演予稿集, 3rd, 2005
• 光合成タンパク質複合体(PSI)をナノ部品とするバイオ共役ナノマテリアルの固定化と光電流応答
  寺崎正; 山本典孝; 玉田薫; 平賀隆; 藤利彰彦; 佐藤幾太郎; 井上康則; 山野井慶徳; 米沢徹; 森山佳則; 西原寛; 米山賢史; 皆方誠; 大森努; 酒井誠; 藤井正明, ナノ学会大会講演予稿集, 3rd, 2005
• 光合成たんパく質複合体を利用した新規人工光電変換システムへのアプローチ
  山野井慶徳; 森山佳則; 水野克哉; 米沢徹; 西原寛; 藤利彰彦; 佐藤幾太郎; 井上康則; 寺崎正; 山本典孝; 玉田薫; 平賀隆; 米山賢史; 皆方誠; 大森努; 酒井誠; 藤井正明, Review of Polarography, 51, 3, 2005
• 高分子を語る : 20-30代から
  岩田 忠久; 岡村 直子; 上垣外 正己; 田中 賢; 林 真弓; 水谷 章子; 大和 雅之; 米澤 徹; 岡畑 恵雄, 高分子, 53, 1, 1, 12, 10 Oct. 2004
  高分子学会, Japanese
• 超偏極¹²⁹Xe NMRによる包摂化合物の相互作用評価
  服部峰之; LEE Y-J; 早水紀久子; 平賀隆; 山野井慶徳; 倉科昌; 米沢徹; 西原寛, NMR討論会講演要旨集, 43rd, 2004
• Formation of an isolated spherical three-dimensional nanoparticle assembly as stable submicrometer-sized units by using an inorganic wrapping technique
  T Yonezawa; H Matsune; N Kimizuka, ADVANCED MATERIALS, 15, 6, 499, 503, Mar. 2003
  English
• フレッシュマンのための「ナノテク・キーワード」－ナノテク活用技術の流れを読む－「自己組織化／自己集積」
  米澤徹, 化学装置, 45, 3, 28, 30, 2003, [Invited]
  工業調査会, Japanese, Introduction commerce magazine
• Metal Goating of DNA Molecules by Cationic, Metastable Gold Nanoparticles
  YONEZAWA Tetsu; ONOUE Shin-ya; KIMIZUKA Nobuo, Chem. Lett., 2002, 12, 1172, 1173, 05 Dec. 2002
  English
• Formation of Nanoparticle Arrays at the Interlayer of Aqueous Phosphate Bilayers
  YONEZAWA Tetsu; ONOUE Shin-ya; KIMIZUKA Nobuo, Chemistry Letters, 2002, 5, 528, 529, 05 May 2002
  English
• Direct preparation and size control of palladium nanoparticle hydrosols by water-soluble isocyanide ligands
  T Yonezawa; K Imamura; N Kimizuka, LANGMUIR, 17, 16, 4701, 4703, Aug. 2001
  English, Report scientific journal
• Preparation of Controlled Nanoparticles and Their Ordered Arrays
  YONEZAWA Tetsu, 高分子学会予稿集, 50, 1, 46, 48, 07 May 2001
  Japanese
• Formation of uniform fluorinated gold nanoparticles and their highly ordered hexagonally packed monolayer
  T Yonezawa; S Onoue; N Kimizuka, LANGMUIR, 17, 8, 2291, 2293, Apr. 2001
  English, Report scientific journal
• Self-Organized Superstructures of Fluorocarbon-Stabilized Silver Nanoparticles
  YONEZAWA T; ONOUE S; KIMIZUKA N, Advanced Materials, 13, 2, 140, 142, 16 Jan. 2001
• Controlled growth of gold nanoparticles in organic gels
  Tetsu Yonezawa; Masaya Fukumaru; Nobuo Kimizuka, Studies in Surface Science and Catalysis, 132, 525, 528, 01 Jan. 2001
• Controlled formation of smaller gold nanoparticles by the use of four-chained disulfide stabilizer
  T Yonezawa; K Yasui; N Kimizuka, LANGMUIR, 17, 2, 271, 273, Jan. 2001
  English, Report scientific journal
• Preparation of Highly Positively Charged Silver Nanoballs and Their Stability
  YONEZAWA T; ONOUE S; KIMIZUKA N, Langmuir, 16, 12, 5218, 5220, 13 Jun. 2000
• Structure of Monoalkyl-Monocationic Surfactants on the Microscopic Three-Dimensional Platinum Surface in Water(共著)
  YONEZAWA T; TOSHIMA N; WAKAI C; NAKAHARA M; NISHINAKA M; TOMINAGA T; NOMURA H, Colloids and Surfaces A, 169, 1/3, 35, 45, 2000
• N. Toshima and T. Yonezawa, Bimetallic Nanoparticles-Novel Materials for Chemical and Physical Applications
  TOSHIMA N; YONEZAWA T, New J. Chem., 22, 11, 1179, 1201, 1998
• Molecular Behavior on Micriscopic 3-Dimensional Metal Surface-Preparation and Structure of Highly Dispersed Metal Particles-
  YONEZAWA Tetsu, 化学と工業 = Chemistry and chemical industry, 50, 2, 147, 150, 01 Feb. 1997
  日本化学会, Japanese
• 金属コロイドの構造と触媒作用
  米沢 徹; 戸嶋 直樹, 表面, 34, 7, 426, 438, Jul. 1996
  広信社, Japanese
• ¹⁹⁵Pt NMR of Polymer-Protected Pt/Pd Bimetallic Catalysts(共著)
  TONG Y Y; YONEZAWA T; TOSHIMA N; VAN DER KLINK J, J. Phys. Chem., 100, 2, 730, 733, 1996
• T. Ypnezawa, T. Tominaga, and N. Toshima, Protecting Structure Analyses of Organic Molecule-Protected Nanoscopic Noble Metal ClusterT. Ypnezawa, T. Tominaga, and N. Toshima, Protecting Structure Analyses of Organic Molecule-Protected Nanoscopic Noble M・・・
  YONEZAWA T; TOMINAGA T; TOSHIMA N, Polym. Adv. Tech., 7, 8, 645, 651, 1996
  T. Ypnezawa, T. Tominaga, and N. Toshima, Protecting Structure Analyses of Organic Molecule-Protected Nanoscopic Noble Metal ClusterT. Ypnezawa, T. Tominaga, and N. Toshima, Protecting Structure Analyses of Organic Molecule-Protected Nanoscopic Noble Metal Clusters
• Novel Characterization of the Structure of Surfactants on Naroscpic Metal Clusters by a Physico-Chemical Method, (共著)
  YONEZAWA T; TOMINAGA T; TOSHIMA N, Langmuir, 11, 12, 4601, 4604, 1995
• Mechanistic Consideration of Formatin of Polymer-Protected Nanoscopic Bimetallic Clusters, (共著)
  YONEZAWA T; TOSHIMA N, J. Chem. Soc., Faraday Trans.,, 91, 22, 4111, 4119, 1995
• GOLD-PLATINUM BIMETALLIC CLUSTER CATALYSTS FOR VISIBLE LIGHT-INDUCED HYDROGEN-PRODUCTION FROM WATER
  N TOSHIMA; T YONEZAWA, PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-CHEMICAL SCIENCES, 105, 6, 343, 352, Dec. 1993
  English
• N. Toshima, T. Yonezawa, and K. Kushihashi, Polymer-Protected Palladium/Platinum Bimetallic Clusters. Preparation, Catalytic Properties and Structural Considerations.
  TOSHIMA N; YONEZAWA T; KUSHIHASHI K, J. Chem. Soc., Faraday Trans., 89, 14, 2537, 2543, 1993
• T. Yonezawa and N. Toshima, Polymer-and Micelle-Protected Gold/Platinum Bimetallic Systems. Preparation, Application to Catalysis for Visible Light-Induced Hydrogen Evolution, and Analysis of Formation Process with Optical Methods.
  YONEZAWA T; TOSHIMA N, J. Mol. Catal., 83, 1/2, 167, 181, 1993
• PREPARATION OF POLYMER-PROTECTED GOLD PLATINUM BIMETALLIC CLUSTERS AND THEIR APPLICATION TO VISIBLE LIGHT-INDUCED HYDROGEN EVOLUTION
  N TOSHIMA; T YONEZAWA, MAKROMOLEKULARE CHEMIE-MACROMOLECULAR SYMPOSIA, 59, 281, 295, Jun. 1992
  English
• N.Toshima, M.Harada, T.Yonezawa, K.Kushihashi, and K.Asakura, Structural Analysis of Polymer-Protected Pd-Pt Bimetallic Clusters as Dispersed Catalysts by Using Extended X-Ray Absorption Fine Structure Spectroscopy
  TOSHIMA N; HARADA M; YONEZAWA T; KUSHIHASHI K; ASAKURA K, J.Phys.Chem., 95, 19, 7448, 7453, 1991

• 金属ナノ粒子の合成・設計・制御と応用技術
  米澤 徹
  サイエンス＆テクノロジー, 16 Dec. 2022, 9784864282482, [Supervisor]
• Reducing Agents in Colloidal Nanoparticle Synthesis
  Tetsu Yonezawa; Shilei Zhu; Mai Thanh Nguyen, Miscellancous Reductants” in “Reducing Agents in Colloidal Nanoparticle Synthesis
  Royal Society of Chemistry, May 2021, 9781839161650, English, [Peer-reviewed]
• ナノ材料解析の実際
  米澤, 徹; 朝倉, 清高; 幾原, 雄一
  講談社, Jun. 2016, 9784061543928, xii, 338p, Japanese, [Joint work]
• 産業応用を目指した無機・有機新材料創製のための構造解析技術
  米澤, 徹; 陣内, 浩司
  シーエムシー出版, Aug. 2015, 9784781310701, vi, 295p, Japanese, [Supervisor]
• Encyclopedia of polymeric nanomaterials
  小林, 四郎; Müllen, K. (Klaus), Metal Nanoparticles
  Springer, 20 Jun. 2015, 9783642296475, 3v. (liv, 2617p. ), English, ［Internationally co-authored］, [Peer-reviewed], [Contributor]
• 粉体・ナノ粒子の創製と製造・処理技術 基礎物性からプロセス設計の実務・トラブル処理まで
  獅子内優; 米澤 徹, 金属ナノ粒子の創製
  テクノシステム, 13 Nov. 2014
• 金属ナノ・マイクロ粒子の最新技術と応用
  米澤, 徹
  シーエムシー出版, Nov. 2013, 9784781308272, vi, 237p, Japanese, [Supervisor]
• 多重安定性を示す新しい金属錯体の創製と分子機能連動系の構築
  西原, 寛; 米澤, 徹; 山野井, 慶徳; 久米, 晶子
  西原寛, Jun. 2009, 357p
• 金属ナノ・マイクロ粒子の形状・構造制御技術
  米澤, 徹
  シーエムシー出版, Apr. 2009, 9784781301167, vii, 307p, Japanese
• ナノ粒子の創製と応用展開
  米澤, 徹
  フロンティア出版, Jan. 2008, 9784902410136, ix, 322p, Japanese

• Graphene Oxide Hybridized Transition Metal Oxide Catalysts for Zinc-Air Flow Cell
  Sim Wei Jian; Mai Thanh Nguyen; Soorathep Kheawhom; Tetsu Yonezawa
  International Conference on Flow Battery 2023 (ICFlowBatt2023), 03 Feb. 2023, English, Invited oral presentation
  03 Feb. 2023 - 10 Feb. 2023, [Invited]
• High Current Density Zinc-Air Flow Cell with Graphene Oxide supported Fe/Co Oxide Electrocatalysts
  Wei Jian Sim; Mai Thanh Nguyen・Soorathep Kheawhom; Tetsu Yonezawa
  化学系学協会北海道支部2023年冬季研究発表会, 25 Jan. 2023, Japanese, Oral presentation
  24 Jan. 2023 - 25 Jan. 2023
• カルボン酸保護銅ナノ粒子の合成と低温接合、粒子構造
  米澤 徹; 塚本宏樹; 戸倉凛太郎
  第29回「エレクトロニクスにおけるマイクロ接合・実装技術」シンポジウム（Mate 2023）, 25 Jan. 2023, Japanese, Oral presentation
  24 Jan. 2023 - 25 Jan. 2023
• Synthesis of Pt single atoms catalyst by magnetron sputtering
  Feng Xiaoyi; NGUYEN Mai Thanh; Yonezawa Tetsu
  化学系学協会北海道支部2023年冬季研究発表会, 24 Jan. 2023, Japanese, Oral presentation
  24 Jan. 2023 - 25 Jan. 2023
• Au25(SR)9(SR+)9クラスターのカチオン性リガンド交換反応における特異な反応性
  イドンフン; 石田洋平; 米澤 徹
  化学系学協会北海道支部2023年冬季研究発表会, 24 Jan. 2023, Japanese, Oral presentation
  24 Jan. 2023 - 25 Jan. 2023
• フラッシュランプアニール法を用いた貴金属高エントロピー合金ナノ粒子の合成
  新開裕二; 米澤 徹
  2022年度日本鉄鋼協会・日本金属学会両北海道支部合同冬季講演大会, 19 Jan. 2023, Japanese, Oral presentation
  19 Jan. 2023 - 20 Jan. 2023, 36960069
• 画像誘導放射線治療で用いる低侵襲マーカーのための高周波プラズマを用いた金ナノ粒子の自動合成
  古岡昂真; 米澤 徹
  2022年度日本鉄鋼協会・日本金属学会両北海道支部合同冬季講演大会, 19 Jan. 2023, Japanese, Oral presentation
  19 Jan. 2023 - 20 Jan. 2023, 室蘭工業大学, Japan, [Domestic Conference]
• 酸化銅ナノ粒子を表面に持つ銅マイクロ粒子を用いた低温焼結可能なダイボンディングペーストの合成
  阿曽崇志; 米澤 徹
  2022年度日本鉄鋼協会・日本金属学会両北海道支部合同冬季講演大会, 19 Jan. 2023, Japanese
  19 Jan. 2023 - 20 Jan. 2023
• 銅微粒子・低温分解性銅錯体を含む自己還元型混合インクを用いた高導電性銅膜の作製
  渡部 蓮; 米澤 徹
  2022年度日本鉄鋼協会・日本金属学会両北海道支部合同冬季講演大会, 19 Jan. 2023, Japanese, Oral presentation
  19 Jan. 2023 - 20 Jan. 2023
• Transition Metal Oxide Catalyst on Reduced Graphene Oxide for High Current Operations of Zinc-Air Battery
  Tetsu Yonezawa
  Department Seminar, Faculty of Engineering, Chulalongkorn University, 19 Dec. 2022, English, Invited oral presentation
  19 Dec. 2022, [Invited]
• Transition Multi Metal Oxide Catalyst Activation by Graphene Oxide Hybridization for High Current Zinc-Air Battery Operations
  Tetsu Yonezawa
  The International Conference on Nanospace Materials 2022（ICNM2022）, 12 Dec. 2022, English, Keynote oral presentation
  11 Dec. 2022 - 14 Dec. 2022, [Invited]
• 金属微粒子・ナノ粒子のインク・ペーストへの分散手法
  米澤 徹
  第９回分散凝集化学技術講座「分散・凝集のすべて」, 02 Dec. 2022, Japanese, Nominated symposium
  01 Dec. 2022 - 02 Dec. 2022, [Invited]
• フラッシュランプアニールによる白金族ハイエントロピー合金ナノ粒子の合成
  新開裕二; 米澤 徹
  令和4年度日本顕微鏡学会北海道支部学術講演会, 19 Nov. 2022, Japanese, Oral presentation
  19 Nov. 2022 - 19 Nov. 2022
• カルボン酸被覆銅ナノ粒子による接合
  田村 一樹; 高橋 悠太; 塚本 宏樹; 米澤 徹
  第12回CSJ化学フェスタ, 20 Oct. 2022, Japanese, Poster presentation
  18 Oct. 2022 - 20 Oct. 2022
• 金属ナノ粒子濃厚分散系の安定構築
  米澤 徹
  第12回CSJ化学フェスタ 材料化学の最先端を歩み続ける濃厚分散系, 19 Oct. 2022, Japanese, Nominated symposium
  18 Oct. 2022 - 20 Oct. 2022, [Invited]
• Metal nanoparticles and synchrotron
  Synchrotron light research institute national lab., Thailand, 12 Oct. 2022, English, Nominated symposium
  [Invited]
• 画像誘導放射線治療で用いる低侵襲マーカーに対する高周波プラズマで合成した金ナノ粒子の適用可能性
  古岡昂真; Liu Haoran; 米澤 徹
  第73回コロイドおよび界面化学討論会, 22 Sep. 2022, Japanese, Poster presentation
  20 Sep. 2022 - 22 Sep. 2022
• 低融点Bi-Sn-In合金を用いた潜熱蓄熱粒子の開発
  樋口翔大; 米澤 徹
  第73回コロイドおよび界面化学討論会, 22 Sep. 2022, Japanese, Poster presentation
  20 Sep. 2022 - 20 Sep. 2022
• Formation Scheme of ZnTe Microspheres via Hot Injection Method
  チャウ ユエンティン; レイチェル・グエン タンマイ; 米澤 徹
  第73回コロイドおよび界面化学討論会, 20 Sep. 2022, English
  20 Sep. 2022 - 20 Sep. 2022
• Structure of Bimetallic Nanoparticles Synthesized by Sputtered Deposition onto Liquid and Their Catalytic Properties
  Mai Thanh Nguyen; Tetsu Yonezawa
  第73回コロイドおよび界面化学討論会, 20 Sep. 2022, English, Invited oral presentation
  20 Sep. 2022 - 20 Sep. 2022, [Invited]
• アルキルカルボン酸被覆銅微粒子の低温焼結とメカニズム解明
  米澤 徹; 戸倉凛太郎
  第73回コロイドおよび界面化学討論会, 20 Sep. 2022, Japanese, Oral presentation
  20 Sep. 2022 - 20 Sep. 2022
• 超音波照射下で誘起されるEGaIn液体金属ナノ粒子触媒によるエタノールからのグラファイトカーボン生成
  川﨑 英也; 大槻 朋子; 杉野 史弥; 山本 健; 徳永智春; 戸倉凜太郎; 米澤 徹
  第73回コロイドおよび界面化学討論会, 20 Sep. 2022, Japanese, Oral presentation
  20 Sep. 2022 - 20 Sep. 2022
• アルギン酸ナトリウム保護金ナノ粒子の合成と低侵襲X線マーカーとしての利用
  米澤 徹; Haoran Liu
  第73回コロイドおよび界面化学討論会, 20 Sep. 2022, Japanese, Invited oral presentation
  20 Sep. 2022 - 20 Sep. 2022, [Invited]
• Pt/Ag Solid Solution Alloy Nanoparticles Co-sputtered onto Liquid Polyethylene Glycol Substrate
  Mingbei Zhu; Mai Thanh Nguyen; Tetsu Yonezawa
  IVC-22 (The 22nd International Vacuum Congress), 15 Sep. 2022, English, Oral presentation
  11 Sep. 2022 - 16 Sep. 2022
• Gold Nanoparticles Sputtered onto Oleic Acid and Oleylamine Liquids
  Mai Thanh Nguyen; Tetsu Yonezawa
  IVC-22 (The 22nd International Vacuum Congress), 15 Sep. 2022, English, Oral presentation
  11 Sep. 2022 - 16 Sep. 2022
• エチレングリコールを用いて合成されたZnTe微粒子の生成機構
  Yuen-ting Rachel Chau; Tetsu Yonezawa
  日本化学会北海道支部2022年夏季研究発表会, 23 Jul. 2022, 日本化学会コロイドおよび界面化学部会, Japanese, Oral presentation
  23 Jul. 2022 - 23 Jul. 2022, 広島大学, Japan, [Domestic Conference]
• 銅ニッケル錯体混合インクの調製と低温焼結
  木村朋貴; 戸倉凜太郎; 米澤 徹
  日本化学会北海道支部2022年夏季研究発表会, 23 Jul. 2022, Japanese, Oral presentation
  23 Jul. 2022 - 23 Jul. 2022
• 金属ナノ粒子・微粒子ペースト作製の実際
  米澤 徹
  日本ディスパージョンセンター技術研究会, 24 Jun. 2022, Japanese, Nominated symposium
  24 Jun. 2022 - 24 Jun. 2022, [Invited]
• 金属ナノ粒子・微粒子の合成と回収の決め手
  米澤 徹
  日本ディスパージョンセンター技術研究会, 27 May 2022, Japanese, Nominated symposium
  27 May 2022 - 27 May 2022, [Invited]
• Cobalt Nickel Oxides Embedded on reduced graphene oxide as Catalysts for Rechargeable Zinc-air Battery
  Zixuan Huang; Wei Jian; Sim・Tetsu Yonezawa・Thanh Mai Nguyen; Masayuki Takahashi
  化学系学協会北海道支部2022年冬季研究発表会, 25 Jan. 2022, English
  25 Jan. 2022 - 26 Jan. 2022
• Graphene Oxide Induced Iron Cobalt Spinel Oxide Nanoparticles as Bifunctional Catalyst in Zinc-Air Battery
  Wei Jian Sim; Zixuan Huang; Masayuki Takahashi; Mai Thanh Nguyen・Tetsu Yonezawa
  化学系学協会北海道支部2022年冬季研究発表会, 25 Jan. 2022, English
  25 Jan. 2022 - 26 Jan. 2022
• Cu2O形成を抑制することでネッキング促進されるカルボン酸被覆銅微粒子
  戸倉凜太郎; 米澤 徹
  化学系学協会北海道支部2022年冬季研究発表会, 25 Jan. 2022, Japanese, Oral presentation
  25 Jan. 2022 - 26 Jan. 2022
• 画像誘導放射線治療に用いるフィデューシャルマーカーのためのRFプラズマを用いた金ナノ粒子の合成
  古岡昂真; LIU Haoran; 宮本直樹; 米澤 徹
  2021年度日本金属学会・日本鉄鋼協会両北海道支部合同冬季講演大会, 20 Jan. 2022, English
  20 Jan. 2022 - 21 Jan. 2022
• 酸化グラフェン(GO)上におけるFe-Co-Ni合金ナノ粒子の化学合成
  新開裕二; 米澤 徹
  2021年度日本金属学会・日本鉄鋼協会両北海道支部合同冬季講演大会, 20 Jan. 2022, English
  20 Jan. 2022 - 21 Jan. 2022
• プリンテッドエレクトロニクスにおけるカルボン酸被覆銅微粒子を利用した低温焼結の実現
  戸倉凜太郎; 米澤 徹
  超異分野学会 北海道フォーラム, 04 Dec. 2021, Japanese, Public symposium
  04 Dec. 2021 - 04 Dec. 2021
• 結晶構造を制御して実現する銅微粒子低温迅速焼成
  米澤 徹
  長崎大学第3期中期目標・中期計画重点研究課題「次世代エネルギー関連技術に向けた革新的物質科学研究拠点」第20回講演会, 24 Nov. 2021, Japanese, Nominated symposium
  24 Nov. 2021 - 24 Nov. 2021, [Invited]
• Body temperature-activated in situ-formation gel for the delivery and fixation of alginate-stabilized gold nanoparticles for proton beam therapy
  Haoran Liu; Tetsu Yonezawa
  The 5th A3 Foresight Symposium on Organic/Inorganic Nanohybrid Platforms for Precision Tumor Imaging and Therapy, 14 Oct. 2021, English, Invited oral presentation
  13 Oct. 2021 - 14 Oct. 2021, [Invited]
• Iron cobalt oxide nanoparticles supported on reduced graphene oxide bifunctional catalyst in high current density zinc-air battery
  Wei Jen Sim; Mai Thanh Nguyen; Tetsu Yonezawa
  The 5th A3 Foresight Symposium on Organic/Inorganic Nanohybrid Platforms for Precision Tumor Imaging and Therapy, 13 Oct. 2021, English, Invited oral presentation
  13 Oct. 2021 - 14 Oct. 2021, [Invited]
• Bimetal solid-solution alloy nanoparticles synthesized by sputter deposition onto liquid
  Mai Thanh Nguyen; Tetsu Yonezawa
  The 5th A3 Foresight Symposium on Organic/Inorganic Nanohybrid Platforms for Precision Tumor Imaging and Therapy, 13 Oct. 2021, English, Invited oral presentation
  13 Oct. 2021 - 14 Oct. 2021, [Invited]
• Copper Fine Particle and Nanoparticle Systems for Low Temperature Sintering
  Tetsu Yonezawa
  The 11th International Conference on Flexible and Printed Electronics (ICFPE2021), 29 Sep. 2021, English, Invited oral presentation
  27 Sep. 2021 - 01 Oct. 2021, [Invited]
• Synthesis of Pt/Ag solid solution alloy nanoparticles on liquid polymer by co-sputtering
  Mingbei Zhu; Mai Thanh Nguyen; Tetsu Yonezawa
  第72回コロイドおよび界面化学討論会 国際シンポジウム, 21 Sep. 2021, English, Oral presentation
  21 Sep. 2021 - 21 Sep. 2021
• Alginate-stabilized gold nanoparticles preapred in microwave-induced plasma in liquid process with long-term strage stability for potential biomedical applications
  Haoran Liu; Kai Ikeda; Mai Thanh Nguyen; Tetsu Yonezawa
  第72回コロイドおよび界面化学討論会 国際シンポジウム, 21 Sep. 2021, English, Invited oral presentation
  21 Sep. 2021 - 21 Sep. 2021
• Effect of surface oxide on the sitnering of copper fine particels stablized surfacetant molecules in printed electronics
  Rinatro Tokura; Tetsu Yonezawa
  第72回コロイドおよび界面化学討論会 国際シンポジウム, 21 Sep. 2021, English
  21 Sep. 2021 - 21 Sep. 2021
• Femtosecond laser exiced THz wave from Cu/Cu2O interface
  Yuen-ting Rachel Chau; Hsin-hui Huang; Mai Thanh Nguyen; Koji Hatanaka; Tetsu Yonezawa
  第72回コロイドおよび界面化学討論会 国際シンポジウム, 21 Sep. 2021, English
  21 Sep. 2021, ［Internationally co-authored］
• High aspect ratio silver nanowires as top transparent conducting electrodes
  Min Jia Saw; Mai Thanh Nguyen; Naoto Shirahata; Tetsu Yonezawa
  第72回コロイドおよび界面化学討論会 国際シンポジウム, 21 Sep. 2021, English
  21 Sep. 2021, On line
• Sputtering onto a liquid for synthesis of nanoparticles: particle size, aggregation state, composition, and alloy formation
  Mai Thanh Nguyen; Tetsu Yonezawa
  第72回コロイドおよび界面化学討論会, 16 Sep. 2021, English
  15 Sep. 2021 - 17 Sep. 2021, [Invited], [Domestic Conference]
• Copper fine particles / nanoparticles for electroconductive materials
  Tetsu Yonezawa
  Indo-Japan virtual workshop on “Cluster science by interdisciplinary approach: Emerging materials and phenomena”, 04 Sep. 2021, English
  03 Sep. 2021 - 04 Sep. 2021, [Invited], [International presentation]
• 結晶構造を緻密に制御して実現する銅微粒子による低温迅速焼成
  米澤 徹
  JST 新技術説明会, 02 Sep. 2021, JST, Japanese
  02 Sep. 2021, [Invited]
• Composition controllable Pt/Ag alloy nanoparticles synthesized by co sputtering onto liquid polymer
  Mingbei Zhu; Mai Thanh Nguyen; Tetsu Yonezawa
  日本化学会北海道支部2021年夏季研究発表会, 17 Jul. 2021, English
  17 Jul. 2021
• 低温分解性銅錯体を用いた銅微粒子インクによる導電被膜形成
  渡部 蓮; 米澤 徹
  2021年度日本鉄鋼協会・日本金属学会両北海道支部合同サマーセッション, 15 Jul. 2021, Japanese
  15 Jul. 2021
• 湿式法で合成された低温焼結銅微粒子の焼結メカニズムの解明
  戸倉凛太郎; 米澤 徹
  第10回 JSCI/GSCシンポジウム, 29 Jun. 2021, Japanese
  28 Jun. 2021 - 29 Jun. 2021
• Au25クラスター表面での面種と金反応による中性配位子のカチオン化
  成田国広; 石田洋平; 米澤 徹
  ナノ学会第19回大会, 20 May 2021, Japanese
  20 May 2021 - 22 May 2021
• 多重静電相互作用による二次元分子配列構造制御と電子顕微鏡による可視化
  石田洋平; 秋田郁美; 米澤 徹
  ナノ学会第19回大会, 20 May 2021, Japanese
  20 May 2021 - 20 May 2021, [Invited]
• Mixed oleic acid and oleylamine as the matrix for synthesizing metal nanoparticles by sputter deposition
  Mai Thanh Nguyen; Tetsu Yonezawa
  日本化学会第101回春季年会, 21 Mar. 2021, English
  19 Mar. 2021 - 21 Mar. 2021
• ナノ粒子への興味とSDGs～合金触媒と低温接合
  米澤 徹
  北海道大学アカデミックファンタジスタ講演会, 19 Mar. 2021, 北海道大学, Japanese, Public discourse
  19 Mar. 2021, 北海高等学校, Japan, [Invited], [Domestic Conference]
• 金属ナノ粒子のペースト化と最新応用展開
  米澤 徹
  日本ディスパージョンセンター 2020年度年次総会, 17 Mar. 2021, Japanese
  16 Mar. 2021, [Invited]
• “Pt/Ag solid solution alloy nanoparticles synthesized by co-sputtering onto liquid polymer
  Mingbei Zhu; Mai Thanh Nguyen; Tetsu Yonezawa
  第56回応用物理学会北海道支部・第17回日本光学会北海道支部合同学術講演会, 10 Jan. 2021, English
  09 Jan. 2021 - 10 Jan. 2021
• バインダー利用によるα-MnO2ベース亜鉛イオン電池の性能向上
  村松 樹; Soorathep Kheawhom; Mai Thanh Nguyen; 米澤 徹
  第56回応用物理学会北海道支部・第17回日本光学会北海道支部合同学術講演会, 09 Jan. 2021, Japanese
  09 Jan. 2021 - 10 Jan. 2021

• サステイナブルナノ材料科学特論, 2024年, 修士課程, 工学院
• ナノ材料基礎特論, 2024年, 修士課程, 工学院
• ナノ材料応用特論, 2024年, 修士課程, 工学院
• 大学院共通授業科目（一般科目）：自然科学・応用科学, 2024年, 修士課程, 大学院共通科目
• 大学院共通授業科目（一般科目）：自然科学・応用科学, 2024年, 修士課程, 大学院共通科目
• サステイナブルナノ材料科学特論, 2024年, 博士後期課程, 工学院
• ナノ材料基礎特論, 2024年, 博士後期課程, 工学院
• ナノ材料応用特論, 2024年, 博士後期課程, 工学院
• 材料工学演習Ⅰ, 2024年, 学士課程, 工学部
• 材料デザイン工学, 2024年, 学士課程, 工学部
• 材料工学概論, 2024年, 学士課程, 工学部
• 金属材料学, 2024年, 学士課程, 工学部
• 結晶解析学, 2024年, 学士課程, 工学部
• HSI extension/professional program, 2024年, 学士課程, HSI

• Present
  日本金属学会
• Present
  日本質量分析学会
• Present
  高分子学会
• Present
  American Chemical Society
• Present
  Royal Society of Chemistry
• Present
  日本顕微鏡学会
• Present
  ナノ学会
• THE CHEMICAL SOCIETY OF JAPAN

• Design and fabrication of low-temperature sintering-type heat-dissipating and bonding materials through fine crystal structure control
  Grants-in-Aid for Scientific Research
  01 Apr. 2024 - 31 Mar. 2027
  米澤 徹; 徳永 智春
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 24K01174
• 常温焼成可能な銅ナノ粒子導電材料の実現
  科学研究費助成事業
  30 Jun. 2023 - 31 Mar. 2025
  米澤 徹; 見山 克己; 徳永 智春
  日本学術振興会, 挑戦的研究(萌芽), 北海道大学, 23K17855
• Preparation of High Entropy Alloy Nanoparticles with Flash Lamp Annealing
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
  01 Apr. 2021 - 31 Mar. 2023
  米澤 徹
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Hokkaido University, 21H00138
• Optimization of nanoparticles for development of ultra-broadband light sources
  Grants-in-Aid for Scientific Research
  09 Oct. 2018 - 31 Mar. 2022
  Tetsu Yonezawa
  Interaction of intense laser pulses with condensed matter, especially, nanoparticle stable aqueous dispersions, is expected to produce a variety of nonlinear optical effects. Among them, there have been independent experimental studies on high-energy pulsed X-ray (keV) generation through high-temperature plasmas for wavelength conversion and on low-energy terahertz wave (meV) generation based on higher-order nonlinear optical effects. In this study, femtosecond pulsed lasers have been irradiated to various nanoparticle aqueous dispersions and the energy generated from them have been detected. As a result, X-rays were efficiently extracted from Au nanoparticle aqueous dispersions, and THz-wave emission was also obtained from the Cu2O/Cu thin-layer interface. THz emission was also obtained from ZnTe nanoparticle aqueous dispersions, indicating that the interaction of intense laser pulses with condensed systems such as nanoparticles can produce an ultra-broadband light.
  Japan Society for the Promotion of Science, Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), Hokkaido University, 18KK0159
• Challenge to elucidate and optimize the radiation sensitizing effect of gold nanoparticles by quantum life science approach
  Grants-in-Aid for Scientific Research
  01 Apr. 2018 - 31 Mar. 2022
  Hashimoto Takayuki
  Radiation effects on metals, such as gold nanoparticles, was investigated to improve the results of radiotherapy for intractable cancers. Observation of gold particles in cellular microstructure was delayed due to damage to an ultra-high voltage electron microscope caused by the great earthquake, and proton irradiation experiments using gold nanoparticles that can be administered into the body were not conducted during the period due to the intermittent issuance of a state of emergency declaration and priority measures to prevent spread of the COVID-19. In relation to the interaction between metals in the body and radiation, we published papers on proton therapy for pediatric cancer, in which the radiosensitizing effect of gold particles is expected to be clinically applicable, and on a comparative study of the effects of proton beams and carbon ion beams on implantable medical devices such as pacemakers, respectively.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 18K07660
• Preparation of rapid conductive thin film layer by nano-copper blow-out by slightly oxidized copper particles and low temperature sintering
  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)
  28 Jun. 2019 - 31 Mar. 2021
  Yonezawa Tetsu
  In this study, we synthesized copper nanoparticles with micro-oxide nanoparticles and slightly oxidized phase on the surface layer as copper particles for low temperature sintering. We succeeded in establishing an industrial synthesis method to obtain more than several tens of grams/batch. The obtained fine particles were dispersed in dipropylene glycol using a bead mill. By determining the bead mill conditions, we were able to synthesize a stable paste. At present, it was found that the copper particulate content could be as high as 80 wt% or more. When this paste was applied to a substrate and sintered at less than 200°C, we succeeded in forming a conductive film with a low resistivity within a few times that of the bulk. They also showed that the film formation mechanism is due to "nano-copper blowout," which is an enhanced diffusion of atoms.
  Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Exploratory), Hokkaido University, 19K22094
• High Entropy Alloy Nanoparticles Prepared by Plasma-in-Liquid Process
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
  01 Apr. 2019 - 31 Mar. 2021
  米澤 徹
  液中でのプラズマ法を用いたハイエントロピー合金（HEA）ナノ粒子の直接合成に引き続き従事した。ハイエントロピー合金とは多元素を等モル程度含んだ合金のことである。液中プラズマ、さらには、レーザーアブレーション法の適用、酸化した多元素合金の還元、その際における合金ナノ粒子のカプセル化に挑戦し結果をえた。レーザーアブレーション法と同様液中プラズマ法においても、前周期遷移金属の場合には酸化したナノ粒子が生成した。溶媒を有機溶媒に代えても、還元体を得ることが難しかった。
  本研究では前周期遷移金属に集中し、得られたナノ粒子は還元操作によってハイエントロピーナノ粒子化できると考え、水素環境場における還元によって微細な合金ナノ粒子の合成に挑戦した。
  筆者らは酸化スズをベーマイトでコーティングし還元操作によってコアシェル構造を持つナノ粒子の合成に成功している。そこで、ハイエントロピー合金ナノ粒子においても、還元操作においては金属酸化物コーティングを行い、還元操作時の融合・凝集を防ぐ操作を行った。本研究においてもべーマイト処理法を用いて、それによって粒子1つをアルミナコートすることに成功した。つまり、べーマイトコーティング手法は汎用的で、比較的幅広い合金系に適応できる可能性を見出した。
  得られたナノ粒子についてさらにXRD、TEM、SEMなどによって構造解析を行った。まだ十分なデータの蓄積が得られていないので引き続き検討する。
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Hokkaido University, 19H05162
• Preparation of Stable and Efficient Fluorescent Alloy Nanoparticles by Matrix Sputtering
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
  01 Apr. 2018 - 31 Mar. 2021
  Yonezawa Tetsu
  In this study, nanoparticle synthesis, especially alloy nanoparticles, was carried out by matrix sputtering method using a multidimensional magnetron sputtering system. The obtained particles were stable and well dispersed. Direct sputtering onto TEM grids was also performed. The obtained microstructures were investigated in detail using XRD and aberration-corrected (atom-resolved) STEM, and the optical properties were investigated.
  Crystal structure analysis by XRD and atomic arrangement analysis by STEM revealed that each of the obtained nanoparticles is an alloy and has a solid solution structure. This was a characteristic of the matrix sputtering method. The optical properties were also investigated and showed luminescence.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 18H01820
• マトリクススパッタリング法による無機元素ブロック包埋機能性ハイブリッド樹脂の構築
  科学研究費助成事業 新学術領域研究(研究領域提案型)
  01 Apr. 2013 - 31 Mar. 2015
  米澤 徹
  設計したマグネトロンスパッタリング装置を用い、そのチャンバー内に直接液状高分子や樹脂モノマー液を導入し、また場合によっては、添加剤となる金属錯形成物質を導入して無機ヘテロ元素ブロックとしての金属ナノ粒子・金属酸化物ナノ粒子の直接合成を試みた。これをマトリックススパッタリング法と名付けた。
  ナノ粒子の粒子径制御には、金属配位化合物の利用が効果的である。液体マトリックス中にチオールなどの金属配位化合物を導入することによりナノ粒子の粒子径制御が可能であることを見出している。一方で、液体マトリックスとは別に、やや揮発性の高いチオール分子をチャンバー内に入れ、チャンバーのガス雰囲気にチオール分子を導入することによっても、ナノ粒子の小粒径化に成功した。このとき、得られたナノ粒子の量子収率は極めて高かった。一般に金ナノ粒子の発光量子収率は1-2%程度であるが、この手法で得られた金ナノ粒子は、10%を越える量子収率を示すものも多く、最大で16%にも達した。これは、チャンバー雰囲気にチオール分子を導入することにより、クラスター状態でナノ粒子がチオールに覆われ、スパッタリング液表面でそれらが凝集したものをナノ粒子として回収しているからと考えられる。そのため、金錯体のような高い量子収率を示しながら、安定にその発光特性を維持できる金ナノ粒子を合成できたことになる。極めて興味深い実用的な材料である。
  金属酸化物ナノ粒子の合成では、チタニアの樹脂内への導入について議論を行ってきたが、酸素欠損型のチタニアが多く得られる場合があった。
  また、共同研究の大きな成果としては、銅－パラジウム合金ナノクラスターをDMFを還元剤として用いて可能とした。このとき、この合金クラスターは固溶体構造を取っていることがXPSより示唆された。また、発光量子収率も金属組成によって変化することが示され、興味ある合金素材となった。
  日本学術振興会, 新学術領域研究(研究領域提案型), 北海道大学, 25102501
• Development of biorelated-material-inspired ionic liquid for a visualizing agent for electron microscopic observations
  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
  2012 - 2012
  YONEZAWA TETSU; ABE Shigeaki
  In this study, we have used ionic liquids as the SEM visualizing reagent of non-conductive nanomaterials and bio-related samples including cells and construct an optimized pre-treatment method for SEM observation. Ionic liquids are organic salts which are in liquid at room temperature and do not evaporate even in a vacuum conditions. Therefore, they should be a suitable material for SEM visualization.
  We have been able to establish the processes to visualize non-conductive nanomaterials during this research period. For bio-related samples, including cells, we applied choline-type structured ionic liquids as the visualizing agents. The samples were dispersed in the ionic liquids and put on a membrane filter. The dispersion was filtered gently under reduced pressure by using a syringe and excess ionic liquids were removed. Using this process, red blood cells could be observed by SEM without any deformation.
  Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, Principal investigator, Competitive research funding, 24656026
• Surface Assisted Laser Desorption Ionization Mass Analysis System for Drugs and Toxic Molecules
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
  2012 - 2012
  Yonezawa Tetsu; FUJINO Tatsuya; ISHIDA Yohei
  The aims of this study are to prepare suitable nanoparticles for surface-assisted desorption ionization mass spectroscopy and to understand the ionization mechanism by laser irradiation. Lager nanoparticles showed better soft-ionization ability. Therefore, milder increasing of the nanoparticle temperature is important for soft ionization. Also, sodium ion doped TiO2 nanoparticles showed a very high SALDI ability. This result strongly suggest that desorption of molecules by laser irradiation is quite effective and increasing of ionization ability of nanoparticles is an important key to obtain higher sensing ability of SALDI-MS systems.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, Principal investigator, Competitive research funding, 24241041
• 生体関連物質のソフトイオン化を目指すナノLDI-MS基板の開発とメカニズム解明
  科学研究費補助金(特定領域研究)
  2010 - 2011
  米澤 徹; 菊地 竜也
  本研究では、表面支援レーザー脱離イオン化質量分析法(SALDI-MS法)に用いられる金属ナノ粒子の合成とその挙動、さらには脱離・イオン化のメカニズム解明に挑戦した。まずは、サンプル用基板を作成するために、さまざまな金属・酸化物・半導体のナノ粒子および異方性粒子を作成した。結果として、その物質、構造、大きさ、形状がいずれも有機物の脱離に大きく影響することが分かった。そこで得られた粒子を用いて塗布した基板上に、波長を変えてパルスレーザーを照射したところ、可視光では、金ナノ粒子がそのプラズモン吸収で効率のいい脱離・イオン化性能を示したのに対し、紫外レーザーでは高い脱離・イオン化性能を示す酸化チタンナノ粒子は可視光では負の効果を示した、つまり脱離・イオン化する分子の量を平板基板よりも少なくしてしまった。この結果は、表面支援におけるレーザー脱離・イオン化においては、単純にパルスレーザー照射によって発生する局所的な熱による分子の基板表面からの脱離ではなく、光反応が脱離・イオン化に関与していることを明確に示している。さらに、紫外レーザーによる脱離では、金ではなく、白金は金属酸化物が効率のよい脱離とイオン化を見せていることから、単純に熱のみによるものではないことが分かる。メカニズムの明快な説明はまだできてはいないが、光による電子移動が関与している可能性がより高まったことで、SALDI-MSに...
  文部科学省, 特定領域研究, 北海道大学, Principal investigator, Competitive research funding, 22018001
• Surface-assisted laser desorption/ionization mass analysis system with nano-scale surface modified sample substrate
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
  2009 - 2011
  YONEZAWA Tetsu; FUJII Masaaki; ISHIUCHI Shun-ichi; ARAKAWA Ryuichi; KAWASAKI Hideya
  Development of surface assisted LDI (SALDI) system used for analyses of low molecular compounds has been carried out. Dealloy process with electrochemical etching could successfully provide nanoporous platinum plate. The structure of nanopores strongly varied with the alloy composition. These plates were applied as SALDI-MS sample plate, desorption/ionization of organic compounds could not be detected. On the other hand, aggregated sample plate of semiconductor nanoparticles effectively
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Principal investigator, Competitive research funding, 21310072
• 光-分子強結合場を利用する合成高分子用LDI基板の構築
  科学研究費補助金(特定領域研究)
  2009 - 2010
  米澤 徹
  本研究では、光-分子強結合場を利用した、レーザー照射による有機分子の脱離とそのソフトイオン化について検討している。ソフトイオン化とは、有機物質を分解しないでイオン化することである。そこで、本年度は、光-分子強結合場を発現させる手段として金粒子の基板上への集積による表面支援レーザー脱離イオン化法について検証を行った。シリコン基板上にアミノシラン単分子膜を用いて作製した金粒子の集積した部分において、特に有機化合物の脱離・イオン化がレーザー照射によって起こりやすいことが見いだされた。一方で、単層の金粒子吸着層だと脱離・イオン化は生じにくい。このことは、レーザー脱離イオン化のメカニズムを考えるときに重要であり、金の場合においては、ナノ粒子の作る基板表面の凹凸ではなく、微粒子の凝集が有機物質の脱離およびイオン化に極めて有効に効いていることが明らかとなっている。つまり、ナノ粒子凝集エリアがつくる光-分子強結合場が脱離・イオン化を加速する方向に働いていることを示していると考えられる。一方で、レーザー照射による有機化合物の脱離量を相対的に比較したところ、金ナノ粒子の示すプラズモン吸収領域の波長のレーザーを用いた場合には脱離量が増大すると考えられた。この結果も、光-分子強結合場が光による基板表面からの有機物質の脱離・イオン化を促進していることを強く支持ずる。これは、本研究で目標とした、光-分子...
  文部科学省, 特定領域研究, 東京大学->北海道大学, Principal investigator, Competitive research funding, 21020010
• 生体機能分子の非分解イオン化のための無機ナノ構造体LDI基板の設計と構築
  科学研究費補助金(特定領域研究)
  2008 - 2009
  米澤 徹
  本研究では、有機物のレーザーによる非分解イオン化(ソフトイオン化)のための無機ナノ構造体の設計を行っている。特に、これまでの研究から、先鋭化された部分をもつナノ構造を持たせた表面が電界集中に有効と考えられるため、そうしたナノ構造体の合成、基板構築を行ってきている。特に、白金などはそうした構造を作りやすい。また、レーザー照射による有機物の脱離量についても検証を行ってきた。これまでの検証から、白金を用いた場合のレーザーによる脱離量が非常に大きいことが見いだされた。また、半導体基板を用いたソフトイオン化についても検証した。その一方で、SALDI-MSではどうしても脱離・イオン化しない物質がいくつか見いだされた。低分子量の物質でもそのようなものがあるため、脱離とイオン化を分けて考えるシステムを構築する必要があることが明確となった。というのも、低分子量の物質が基板表面から脱離していないとは考えにくく、脱離したもののイオン化されていないと考察される。こうした物質をあつめ、構造を検証し、どのような構造が脱離・イオン化を抑制してしまうのか考える必要があると思われる。一方で、白金ナノ構造体を用いた基板上からは、長波長レーザーによっても有機物質をイオン化できることが明らかとなった。長波長のレーザーは、エネルギーが小さく、有機物質のソフトイオン化にはさらに好適であることは自明である。こうした可能性...
  文部科学省, 特定領域研究, 東京大学->北海道大学, Principal investigator, Competitive research funding, 20050007
• 光-分子強結合場を利用する合成高分子用LDI基板の構築
  科学研究費補助金(特定領域研究)
  2008 - 2008
  米澤 徹
  従来、生体機能物質の非分解イオン化のためによく用いられてきたMALDI-MS法に代え、金属ナノ粒子を塗布した、ナノレベルの凹凸を有する基板を作製し、有機マトリクスフリーで、UVレーザーを用いて、合成高分子をソフト脱離・イオン化を起こすことを試みている。本研究では、特に、光-分子強結合場を利用したレーザーソフト脱離・イオン化を試みている。そこで、表面の清浄な金属ナノ粒子を合成するために、レーザーアビュレーション法を用いた。レーザーアビュレーション法は、インゴットから容易にナノ粒子を合成することができる手法である。その手法で、金、銀、白金、銅ナノ粒子を合成し、分子量10000程度までの分子のソフトイオン化を試みた。結果として、金および白金に顕著なソフト脱離・イオン化能があることが示された。白金は特に熱伝導率が小さいためにイオン化が促進されたと理解され、金の場合には、光-分子強結合場の可能性が見られた。しかし、銀および銅には脱離・イオン化能が見当たらず、現在、金ナノ粒子で試験を行っている。また、単層金ナノ粒子吸着では脱離イオン化能は見受けられないことから、高分子との交互積層を行った、ナノ粒子多積層体や、高濃度に基板上に塗布した金ナノ粒子凝集体が脱離・イオン化に重要なことも示されている。今後はさらに構造体制御を行って、効率のよいレーザー脱離・イオン化システムの構築を行う。
  文部科学省, 特定領域研究, 東京大学, Principal investigator, Competitive research funding, 20043011
• 層状金属カルコゲナイドを母体とするナノクラスターの合成と物性探索
  科学研究費補助金(萌芽研究)
  2007 - 2008
  島田 敏宏; 米澤 徹
  有機物は柔らかいため曲げに強い印刷可能な電子素子を作成できる利点はあるが、分子間振動のエネルギーが数十meVと低いことから、室温では振動によるキャリヤ散乱の影響が大きく、無機物に比べて移動度が桁違いに小さくなってしまう。おそらくこの理由により有機半導体の室温移動度は低い。これに対し、無機物のクラスターは溶液中で安定化するためのキャッピング層が通常絶縁物であり問題である。層状物質はもともと層に垂直方向の化学結合が閉じているためこの方向にキャッピング層は必要なく、層が積み重なる形で凝集するために空間充填率も高くなることが期待される。本研究では、層状物質をナノクラスター化することにより新たなフレキシブル電子材料を開発することを目標に、合成法と物性評価を行った。溶液から合成した層状物質クラスターはX線回折が非常に弱く、大部分がアモルファスであることが判明した。層状構造への結晶化は600℃以上の高温が必要であった。その理由を探るため、その場加熱のできる電子顕微鏡を用いて結晶化の過程を観察した結果、400℃程度で未知の結晶構造を持つ別の準安定相ができ、それが層状物質への変化を妨げていることがわかった(論文発表済)。加熱後の物性は、今のところ半導体特性を測定できない絶縁物である。欠陥を少なくする方法が必要であり、気相を経由する方法に切り替えて研究を進めている。本研究に関連した報文は2件、図...
  文部科学省, 萌芽研究, 東京大学, Coinvestigator not use grants, Competitive research funding, 19651048
• Synthesis of novel metal complexes exhibiting multi-stabilities and creation of molecular systems exhibiting multi-functionalities
  Grants-in-Aid for Scientific Research(基盤研究(A))
  2005 - 2007
  Hiroshi NISHIHARA; 山野井 慶徳; 久米 晶子; 米澤 徹
  The purpose of this study is to create intelligent molecular systems where the chemical and physical structures and the optical, magnetic and electronic properties are changed reversibly and then to produce "molecular functional devices" by combining the molecular systems with electrode surface. As for □-conjugated redox complex oligomers and polymers, we have succeeded in bottom-up synthesis of one- and three-dimensional oligomer complex molecular wires by step-wise coordination reactions on the surface, and have found the phenomena of redox-conduction along the molecular wires for the fir...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(A), 東京大学, Coinvestigator not use grants, Competitive research funding, 17205007
• Construction of Electro-functional Space Using Interfacial Bottom-up Synthesis of Coordination Bond Network
  Grants-in-Aid for Scientific Research(特定領域研究)
  2004 - 2007
  Hiroshi NISHIHARA; 村田 昌樹; 山野井 慶徳; 久米 晶子; 米澤 徹
  In this project, we aim at the construction of electro-functional interfacial space by assembling pi-conjugated and/or redox active metal complex molecular chains in one, two, or three dimensions. Bottom-up approach using successive coordination bond formation is utilized in order to create the space in which potential distribution can be controlled by external stimuli such as electrons and photons.Films of linear and branched oligomer wires of Fe (tpy)2 (tpy = 2,2' :6',2" -terpyridine) were constructed on a gold electrode surface by the interfacial stepwise coordination method employing a ...
  Ministry of Education, Culture, Sports, Science and Technology, 特定領域研究, 東京大学, Coinvestigator not use grants, Competitive research funding, 16074204
• 単一粒径ナノ粒子の連続調製システムの構築
  科学研究費補助金(萌芽研究)
  2005 - 2006
  米澤 徹; 齋藤 永宏
  溶液中のプラズマを利用してナノ粒子を大量製造することを試みた。タングステン線を電極とし、高圧パルス電源を使用して、電極間に放電させ、プラズマを発生させた。電極間隔、印加電圧、電流、パルス間隔は、電極間にアーク放電が生じないようにするために適切に制御する必要があった。また、溶液の導電率をアルカリ金属塩の添加によって制御したが、それにはあまり大きく影響されなかった。このとき発生するラジカル、水素、電子によって金属イオンが還元されることが見出された。プラズマ計測を行ってみたところ、このような還元種が生成していることが見出された。また、金、白金、銀、パラジウム、ロジウムなどの貴金属イオンは還元されやすく、ナノ粒子を得ることができた。遷移金属塩からもナノ粒子が得られたように見受けられるが、十分な検証ができていない。多くの金属塩からナノ粒子を作ることに成功したが、ナノ粒子の安定性をさらに向上させるためには原料液の導電性制御のためのアルカリ金属塩の排除を行う必要があることが分かる。一方、原料塩のみでは還元によって導電性が変化していく問題があり、原料のさらなる検討が今後求められる。粒子径は、金属種にも依存するが、単一粒子径にほぼ近い形のものができ、全て球形のものが得られた。異方形状のものは残念ながら得られず、今後、更なる条件検討が必要である。さらに、連続調製装置を作製し、検討を行った。連続調...
  文部科学省, 萌芽研究, 東京大学, Principal investigator, Competitive research funding, 17655059
• Improvement in Energy Conversion Efficiency of Layered Oxide Thermoelectrics Through Self-assembled Texturing
  Grants-in-Aid for Scientific Research(基盤研究(S))
  2002 - 2006
  Kunihito KOUMOTO; 米澤 徹; 増田 佳丈
  Single crystals of homologous phase in the ZnO-In_2O_3 with layer structures were successfully grown by a flux method, and it was confirmed that the in-plane electrical conductivity is two orders of magnitude larger than cross-plane conductivity. Y-doped single crystal was found to show the in-plane conductivity similar to that of textured ceramic, and it was verified semi-quantitatively that ZT of this system would be ultimately achieved to be〜0.5.We have succeeded in preparing high-quality epitaxial thin films of Na_<0.8>CoO_2, which further enabled us to synthesize humidity-stable Sr_xCo...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(S), 名古屋大学, Coinvestigator not use grants, Competitive research funding, 14103008
• Creation of Multifunctional Photochromic Metal Complexes
  Grants-in-Aid for Scientific Research(基盤研究(A))
  2002 - 2004
  Hiroshi NISHIHARA; 栗原 正人; 村田 昌樹; 米澤 徹
  This project aims at the creation of new photochromic metal complexes, the investigation of their unique multiple functionalities, and the fabrication of novel types of molecular switches and memories by organizing them at the electrode surfaces. Summary of the results obtained is as follows, 1)Azobenzene-bound tris(bipyridine)cobalt complexes and ferrocenylazobenzenes underwent novel reversible trans-cis isomerization of azobenzene moieties using the combination of photoirradiation with a single light source and redox reaction of a metal complex moiety. 2)Photoluminescence properties of az...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(A), 東京大学, Coinvestigator not use grants, Competitive research funding, 14204066
• ポリジアセチレン酸を用いたナノ結晶の2次元配列形成
  科学研究費助成事業 特別研究員奨励費
  2003 - 2003
  米澤 徹; MA Zhangfang
  金属ならびに半導体のナノ粒子は「量子サイズ効果」を示す可能性が高く、バルクとも原子・分子とも異なる物性を示すことが期待される。現在はこうしたナノ粒子を湿式法で分散液として調製されることが多く、安価でナノサイズの粒子を単一粒径で得る技術が確立されつつある。こうした、ナノ粒子を材料として利用するとき、ある基板上に秩序を持たせて固定化することが望まれるが、本研究では、手法としてLB法を用いて、スタックさせる界面活性剤としてジアセチレン系カルボン酸に注目した。このカルボン酸は、紫外光によって均一に高分子化されたポリジアセチレン薄膜を形成する。
  3種のジアセチレン系カルボン酸を用いて、等温線がpHによってどのような影響を受けるか検討した。その結果、比較的長鎖のカルボン酸が単分子膜を安定に作ることがわかった。さらに、半導体ナノ粒子であるCdSをジアセチレンカルボン酸単分子膜表面に形成させる試みを行った。調査カルボン酸では、1mM以上のカドミウムイオンを入れても安定に単分子膜ができた。しかし、現時点ではこれらを複写した膜はドメイン構造を作っていた。
  日本学術振興会, 特別研究員奨励費, 東京大学, 02F00360
• 機能性無機微粒子の精密配列制御法の開発
  科学研究費補助金(萌芽的研究)
  2001 - 2001
  河本 邦仁; 増田 佳丈; 米澤 徹
  N_2雰囲気下でSi基板をPTCS(フェニルトリクロロシラン)溶液中に浸漬してPTCS自己組織膜を作製し、ここにフォトマスクを通してUV照射を行う事により、フェニル基とOH基のマイクロパターンを作製した。SiO_2粒子(500nmφ及び15nmφ)の表面にTCES(トリクロロシアノエチルシラン)を結合させて最表面をCN基とし、さらにt-BuOK(カリウムブトキシド)によりCOOH基へと変性した。このSiO_2粒子最表面のCOOH基と自己組織膜上のOH基をDCC(ジシクロヘキシルカルボジイミド)により縮合させてエステル結合を形成させることにより、自己組織膜上のOH基上に選択的にSiO_2粒子を配置させることを試みた。UV照射によりシラノール基へと変性した領域からは、SEM観察によりSiO_2粒子が確認され、フェニル基上からは粒子は観測されなかった。この手法により、マイクロメーターオーダーの2次元粒子配列パターンが形成された。また、ダイヤモンドチップで自己組織膜表面を走査する事により、機械的にフェニル基を取り去り、任意の箇所をシラノール基へと変性した自己組織膜上からも粒子の選択的配列が確認され、1次元の粒子細線が形成できた。また、AFMリソグラフにより変性した自己組織膜上からも選択的粒子配列が確認された。上記のエステル結合の形成に代えて、酸あるいは塩基により粒子表面のシラノール基...
  文部科学省, 萌芽的研究, 名古屋大学, Coinvestigator not use grants, Competitive research funding, 13875122
• 新規な無機ナノボールの創出と特殊配列の付与
  科学研究費補助金(奨励研究(A))
  2000 - 2001
  米澤 徹
  ナノ粒子の調製において、本研究では、これまでにあまり研究例のない、水に良く分散するナノ粒子とフッ素系溶媒に分散するナノ粒子を調製した。これらのナノ粒子は安定で、酸化されたり、沈澱を生じたりしない。特に、フッ素系配位子を用いた場合には遷移金属の微細で単分散なナノ粒子を安定に調製することが可能であることを見出している(特許出願済)。水に分散するナノ粒子は、末端に4級アンモニウム基をもった保護剤で保護したもので、どのようなpHでも正のゼータ電位を有している。そのため、アニオン性の高分子や二分子膜、無機物質表面に容易に吸着し、パターニングによる特殊配列の付与が可能であることがわかった。このような吸着力をもつナノ粒子は、これから期待される塗布用ナノ粒子材料の基材として非常に重要であることが考えられる。また、フッ素系保護剤により保護されたナノ粒子の構造および物性を詳細に検討したところ、これらのナノ粒子が(1)空気下で安定に調製できる、(2)空気中に安定に保存できる、(3)沈殿させて粉末状に保存ができる。(4)フッ素系溶剤を用いて簡単に薄く塗布できる。という特徴を有することが分かった。この塗布技術により、ナノ粒子の2次元パターニングが容易にできることが見出され、特殊配列の付与ができたといえる。このように本研究により、研究者らは新しい性質をもつナノ粒子の創成に成功した。また、それらに特殊配列...
  文部科学省, 奨励研究(A), 九州大学->名古屋大学, Principal investigator, Competitive research funding, 12740383
• Fabrication of functhinal cermic devices using biomimetic processes
  Grants-in-Aid for Scientific Research(基盤研究(B))
  2000 - 2001
  Kunihito KOUMOTO; 徐 元善; 増田 佳丈; 米澤 徹
  We succeeded in fabricating micropatterns of titanium dioxide thin films on SAMs (self-assembled monolayers). SAMs of OTS (octadecyltrichloro-silane) were formed on Si wafers, and were modified by UV irradiation using a photomask to generate methyl / silanol-pattern. They were used as templates to deposit titanium dioxide thin films by the use of TDD (titanium dichloride diethoxide). Amorphous TiO2 films were selectively deposited on silanol regions. Line width variation of the-pattern of an as-deposited film was improved to be well below the electronics design rule, 5 %. Furthermore, Patte...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 名古屋大学, Coinvestigator not use grants, Competitive research funding, 12450350
• 分子膜と擬一次元金属錯体から成る超分子組織体の開発とその溶液化学
  科学研究費補助金(特定領域研究(A))
  2000 - 2000
  君塚 信夫; 米澤 徹
  ハロゲン架橋一次元白金混合原子価錯体[Pt(en)_2][PtCl_2(en)_2]と種々のアニオン性合成脂質とのポリイオンコンプレックス形成により、脂溶性の有機-無機超分子組織体を作成した。キラルなアニオン性脂質の合成について合成ルートを検討した結果、L-グルタミン酸ジドデシルエステルとスルホ酢酸を、ピリジン存在下BOP試薬で縮合させる方法が有効であることを明らかにした。この脂質と[Pt(en)_2]、[PtCl_2(en)_2]を含む水溶液を混合したところ、紫色の沈殿がえられた。この紫色はPt(II)→Pt(IV)の電荷移動吸収に基づくものであり、複合体中において一次元白金錯体が形成されていることが判った。この複合体はクロロホルムに分散すると淡黄色となり、これは分子錯体[PtCl_2(en)_2]の色であることから、クロロホルム中においてハロゲン架橋構造は解離していることがわかった。一方、ジクロルメタン中においては紫色の溶液として分散し、溶媒に依存して一次元白金錯体構造が保たれることが判った。この溶液について円偏光二色性スペクトルの測定を行ったところ、電荷移動吸収帯に励起子分裂型のコットン効果が観測された。これは、脂質の不斉によって一次元白金錯体にCDスペクトルが誘起された、はじめての例であり、脂質と一次元錯体の構造秩序性が極めて高いことが明らかとなった。さらに、AFM観...
  文部科学省, 特定領域研究(A), 九州大学, Coinvestigator not use grants, Competitive research funding, 12023238
• 二分子膜ハイドロゲルの創成に基づく蛋白質機能の時空間制御
  科学研究費補助金(特定領域研究(A))
  1999 - 2000
  君塚 信夫; 一ノ瀬 泉; 米澤 徹
  我々は"分子組織性ハイドロゲル"を開発し、その基本特性を解明することを目的として、複数のアミド基を含み、かつグルタミン酸骨格を有するカチオン型脂質を合成した。その結果、従来の二分子膜形成化合物に比べて短いアルキル鎖(C_8:短鎖型脂質)ならびにイソプロピル基を疎水部側に導入した分岐型脂質に過塩素酸アニオン、ナフタレンスルホン酸などの疎水性アニオンを添加すると、ハイドロゲルが得られることが判った。これらの分散水溶液(1^〜2mM)について電子顕微鏡観察を行ったところ、幅8-10nm、長さ3μm以上のファイバー状会合体を基本とする網目状構造が観測された。これらの会合形態は二分子膜に特徴的なものであり、疎水性アニオンの添加によって、これらの短鎖型脂質や分岐型脂質が発達したファイバー状架橋構造を与えたことが判る。従来型の二分子膜形成化合物においては、このようなハイドロゲル形成が認められないことから、(i)結晶性を低めた疎水部構造、(ii)疎水性のイオンペアから成る親水部、かつ(iii)発達した水素結合ネットワークの形成が分子組織性ハイドロゲルを得るための条件であることが判った。ゲルを加熱すると、60-75℃の領域で溶解してゾルとなり、その後さらに加熱すると急激に白濁した。この変化は可逆的であり、冷却すると白濁が消失して元の均一なハイドロゲルが得られた。このように、分子組織性ハイドロゲ...
  文部科学省, 特定領域研究(A), 九州大学, Coinvestigator not use grants, Competitive research funding, 11167264
• Development of the Gel -Assisted Transfer Technique
  Grants-in-Aid for Scientific Research(基盤研究(C))
  1999 - 2000
  Nobuo KIMIZUKA; 一ノ瀬 泉; 米澤 徹
  We have studied two-dimensional organization of water-solubie nanoparticles by the use of hydrogel surface as substrate, and provide the first experimental report on gel-assisted transfer (GAT) of nanoparticles onto solid substrates.Colloidal dispersions of silica nano-particles (diameter, 100 nm) were spread on agarose gel surface. The spreading solution on the gel disappeared either by penetration or by evaporation after ca. 12 hrs. Solid substrates (HOPG, mica) were subsequently pressed against the gel surface. In scanning electron microscopy, densely packed silica nanoparticles are foun...
  Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(C), 九州大学, Coinvestigator not use grants, Competitive research funding, 11640585
• 多核錯体の逐次吸着を利用する傾斜機能材料の作成
  科学研究費補助金(特定領域研究(A))
  1998 - 1998
  一ノ瀬 泉; 米澤 徹
  我々は、分子レベルで組成制御された傾斜機能材料を構築するために、新しい逐次吸着法によるナノ傾斜薄膜の作成を検討してきた。本研究では、互いに反対電荷を有する高分子電解質を用いた交互吸着法、金属アルコシキドの逐次吸着より酸化物ゲル薄膜を作成する表面ゾルゲル法、さらに重合溶媒から直に高分子超薄膜を作成する重合吸着法を確立し、様々な化学的機能の発現を謀った。表面ゾルゲル法では、分子的厚みの酸化物薄膜(チタン、インジウム、ニオブ等)や水酸基を有する有機分子を任意のシーケンスで積層化できる。我々は、酸化物ナノ薄膜とポルフィリン系色素分子との積層型薄膜を作成し、湿式系での光電変換特性を検討した。ITO基板に作成した約20ナノメートルの厚みのIn_2O_3/ポルフィリン多層薄膜にレーザーを照射すると、数μA/cm^2の光電流が観察された。光電流は、積層回数に比例して増大し、酸化物層の種類にも大きく依存した。一方我々は、末端に水酸基とチオール基を有する長鎖アルキル化合物を保護剤とし、粒径制御された金ナノ微粒子を合成する手法を確立させた。これらのナノ粒子は、表面に多くの水酸基を有し、チタンアルコキシドとの交互吸着により、ナノ粒子の構造を保持したまま、固体基板上への積層化が可能であった。表面ゾルゲル法を用いて水晶発振子上にアミノ酸誘導体を含んだ酸化チタンゲル薄膜を作成し、水酸化ナトリウム水溶液で処...
  文部科学省, 特定領域研究(A), 九州大学, Coinvestigator not use grants, Competitive research funding, 10123219
• 金属ナノ粒子を用いた有機-無機複合材料の開発
  科学研究費補助金(奨励研究(A))
  1997 - 1998
  米澤 徹
  金属ナノ粒子として,本研究では金ナノ粒子を選択した.保護剤を添加せずにクエン酸還元法によって調製した金ナノ粒子はその濃縮が困難だが,限外ろ過膜を使用することで,常温で濃縮でき,さらに,分散液中に混在するクエン酸イオンなどを除去した.その分散液に,入れ子型構造単分子膜を形成している両親媒性分子基板を浸積すると,1度の浸積で,ほぼ最密充填の金ナノ粒子モノレイヤーが作成できた.このモノレイヤーも導電性を有し,透明である.静電相互作用でほぼ完璧なナノ粒子モノレイヤーの生成を報告したのはこれが世界で初めてである.こうした吸着挙動を高分子電解質を用いた場合や,様々な濃度の金ナノ粒子を用いる事によって比較検討した.また,粒径の揃った粒子ということで,同様にアニオン性のシリカナノ粒子の吸着挙動をモデルとして検討した.粒径によって,吸着挙動が異なる事が見出され,静電相互作用による粒子の有機層への吸着は,有機層自体の安定性や,相互作用の強さに大きく依存する事が示された.また,二分子膜の親水部層間に金イオンを取り込み,その後に還元する手法によっても金ナノ粒子を得ることができるが,この手法では,金ナノ粒子の形状が二分子膜の水中での膨潤状態によって異なり,分散液中による還元では得られにくい,プレート状や,珊瑚状の金ナノ粒子を得ることができた,さらには,金属と配位相互作用を持つ二分子膜物質を設計し,特異...
  文部科学省, 奨励研究(A), 九州大学, Principal investigator, Competitive research funding, 09740527

• 銅酸化物粒子組成物、導電性ペースト及び導電性インク
  Patent right, 米澤 徹; 塚本 宏樹; 西本 大夢, 国立大学法人北海道大学、住友金属鉱山株式会社
  特願2022-100508, 22 Jun. 2022
  特開2022-136081, 15 Sep. 2022
  Domestic
• 銅クラスター、混合粒子、導電性ペースト及び導電性インク
  Patent right, 米澤 徹; 西本 大夢, 国立大学法人北海道大学、住友金属鉱山株式会社
  特願2019-61444, 27 Mar. 2019
  特開2020-100893, 02 Jul. 2020
  Domestic

• ナノ学会 第21回大会 現地実行委員長
  2022 - 2023
  Planning etc
  ナノ学会
• 國立清華大学（台湾） 教授 外部書面審査委員
  2020
  Review
  國立清華大学
• 日本XAFS研究会 第21回XAFS討論会実行委員
  2018
  Planning etc
  日本XAFS研究会
• 國立清華大学（台湾） 准教授 外部書面審査委員
  2017 - 2017
  Review
  國立清華大学
• ナノ学会 第15回大会 現地実行副委員長
  2016 - 2017
  Planning etc
  ナノ学会
• 日本顕微鏡学会 第73回学術講演会 実行委員会委員
  2016 - 2017
  Planning etc
  日本顕微鏡学会
• ナノ学会 第９回大会 現地役員
  2011
  Planning etc
  ナノ学会
• ナノ学会 第７回大会 現地役員
  2009
  Planning etc
  ナノ学会

• Chair of International Symposium on Sustainable Energy 2023
  2023
  Planner
  北海道大学
• アカデミックファンタジスタ
  2020 - 2021
  Appearance
  北海道大学
  北海道新聞
• 日本顕微鏡学会 第73回学術講演会 実行委員会委員
  2016 - 2017
  Planner
  日本顕微鏡学会
• 科学研究費補助金 第一段審査 審査委員
  2015 - 2016
  Investigator
• 科学研究費補助金 第一段審査 審査委員
  2010 - 2011
  Investigator
• 平成22年度「希少金属代替・削減技術実用化開発助成事業」書面審査委員
  2010
  Investigator
  NEDO

• Listed in September 2022 data-update for "Updated science-wide author databases of standardized citation indicators"
  Oct. 2022
  Elsevier
  Internet
  https://elsevier.digitalcommonsdata.com/datasets/btchxktzyw/4, [Internet]