研究者データベース

平井 健二(ヒライ ケンジ)
電子科学研究所 光科学研究部門
准教授

基本情報

所属

  • 電子科学研究所 光科学研究部門

職名

  • 准教授

学位

  • 博士(工学)(京都大学)

ホームページURL

科研費研究者番号

  • 10754400

J-Global ID

研究キーワード

  • 光化学   ナノマテリアル   錯体化学   

研究分野

  • ナノテク・材料 / 機能物性化学
  • ナノテク・材料 / 無機・錯体化学

職歴

  • 2019年04月 - 現在 北海道大学 大学院情報科学院 情報科学専攻 生体情報工学コース 准教授(兼担)
  • 2018年10月 - 現在 国立研究開発法人科学技術振興機構 さきがけ研究者(兼任)
  • 2017年12月 - 現在 北海道大学 電子科学研究所 准教授
  • 2018年04月 - 2019年03月 北海道大学 大学院情報科学研究科 生命人間情報科学専攻 准教授(兼担)
  • 2014年11月 - 2017年11月 北海道大学 大学院理学研究院 特任助教
  • 2013年04月 - 2014年10月 独立行政法人日本学術振興会 海外特別研究員
  • 2010年04月 - 2013年03月 独立行政法人日本学術振興会 特別研究員(DC1)

学歴

  • 2010年04月 - 2013年03月   京都大学   大学院工学研究科合成・生物化学専攻   博士後期課程
  • 2008年04月 - 2010年03月   京都大学   大学院工学研究科合成・生物化学専攻   修士課程
  • 2004年04月 - 2008年03月   京都大学   工学部   工業化学科

所属学協会

  • 錯体化学会   分子科学会   日本化学会   応用物理学会   

研究活動情報

論文

  • Kenji Hirai, Hiroshi Uji-i
    Chemistry Letters 2021年01月13日 [査読有り][招待有り]
  • Junya Ohyama, Airi Hirayama, Nahoko Kondou, Hiroshi Yoshida, Masato Machida, Shun Nishimura, Kenji Hirai, Itsuki Miyazato, Keisuke Takahashi
    Scientific Reports 11 1 2021年01月 
    AbstractDozens of Cu zeolites with MOR, FAU, BEA, FER, CHA and MFI frameworks are tested for direct oxidation of CH4 to CH3OH using H2O2 as oxidant. To investigate the active structures of the Cu zeolites, 15 structural variables, which describe the features of the zeolite framework and reflect the composition, the surface area and the local structure of the Cu zeolite active site, are collected from the Database of Zeolite Structures of the International Zeolite Association (IZA). Also analytical studies based on inductively coupled plasma-optical emission spectrometry (ICP-OES), X-ray fluorescence (XRF), N2 adsorption specific surface area measurement and X-ray absorption fine structure (XAFS) spectral measurement are performed. The relationships between catalytic activity and the structural variables are subsequently revealed by data science techniques, specifically, classification using unsupervised and supervised machine learning and data visualization using pairwise correlation. Based on the unveiled relationships and a detailed analysis of the XAFS spectra, the local structures of the Cu zeolites with high activity are proposed.
  • Kazushi Yamaguchi, Kohei Otomo, Yuichi Kozawa, Motosuke Tsutsumi, Tomoko Inose, Kenji Hirai, Shunichi Sato, Tomomi Nemoto, Hiroshi Uji-i
    ACS Omega 6 1 438 - 447 2020年11月30日 [査読有り]
  • Ryo Ohtani, Kenichi Kawano, Masanao Kinoshita, Saeko Yanaka, Hikaru Watanabe, Kenji Hirai, Shiroh Futaki, Nobuaki Matsumori, Hiroshi Uji‐i, Masaaki Ohba, Koichi Kato, Shinya Hayami
    Angewandte Chemie International Edition 59 41 17931 - 17937 2020年10月05日
  • Qiang Zhang, Han Wen, Kiri Watanabe, Ibuki Kotani, Monica Ricci, Beatrice Fortuni, Anh Thi Ngoc Dao, Akito Masuhara, Kenji Hirai, Hitoshi Kasai, Tomoko Inose, Hiroshi Uji-i
    ACS Applied Nano Materials 3 8 7643 - 7650 2020年08月28日 [査読有り]
  • Kenji Hirai, James A. Hutchison, Hiroshi Uji‐i
    ChemPlusChem 85 9 1981 - 1988 2020年08月 [査読有り][招待有り]
  • Shuichi Toyouchi, Mathias Wolf, Yusuke Nakao, Yasuhiko Fujita, Tomoko Inose, Beatrice Fortuni, Kenji Hirai, Johan Hofkens, Steven De Feyter, James Hutchison, Hiroshi uji-i
    Nano Letters 20 2460 - 2467 2020年03月10日 [査読有り][通常論文]
  • Kenji Hirai, Rie Takeda, James A Hutchison, Hiroshi Uji-I
    Angewandte Chemie (International ed. in English) 59 5332 - 5335 2020年01月22日 [査読有り][通常論文]
     
    Light-molecule strong coupling has emerged within the last decade as an entirely new method to control chemical reactions. A few years ago it was discovered that the chemical reactivity could be altered by vibrational strong coupling (VSC). While the potential of VSC in organic chemistry appears enormous, only a limited number of reactions have been investigated under VSC to date, including solvolysis and deprotection reactions. Here we investigate the effect of VSC on a series of aldehydes and ketones undergoing Prins cyclization, an important synthetic step in pharmaceutical chemistry. We observe a decrease of the second-order rate constant with VSC of the reactant carbonyl stretching groups. We measure an increased activation energy due to VSC, but proportional changes in activation enthalpy and entropy suggest no substantive change in reaction pathway. The addition of common cycloaddition reactions to the stable of VSC-modified chemical reactions is another step towards establishing VSC as a genuine tool for synthetic chemistry.
  • Mathias Wolf, Kenji Hirai, Shuichi Toyouchi, Eduard Fron, Wannes Peeters, Steven De Feyter, Hiroshi Uji-i
    Chemical Communications 56 87 13331 - 13334 2020年 

    The potential of nonlinear optical microscopy for the label-free visualization of heterogeneities and defects in metal–organic frameworks is demonstrated.

  • Kenji Hirai, Taisei Kitagawa, Hideki Fujiwara, Jenny Pirillo, Yuh Hijikata, Tomoko Inose, Hiroshi Uji-i
    Chemical Communications 56 67 9651 - 9654 2020年 [査読有り][通常論文]
     

    A fluorophore encapsulated in a metal–organic framework showed photochromic multicolour fluorescence.

  • Inose T, Toyouchi S, Lu G, Umemoto K, Tezuka Y, Lyu B, Masuhara A, Fron E, Fujita Y, Hirai K, Uji-I H
    Chemical communications (Cambridge, England) 55 77 11630 - 11633 2019年09月 [査読有り][通常論文]
  • Takahashi K, Takahashi L, Miyazato I, Fujima J, Tanaka Y, Uno T, Satoh H, Ohno K, Nishida M, Hirai K, Ohyama J, Nguyen T.N, Nishimura S, Taniike T
    ChemCatChem 11 4 1146 - 1152 2019年 [査読有り][通常論文]
  • Kenji Hirai, Bongjun Yeom, Kazuki Sada
    ACS NANO 11 6 5309 - 5317 2017年06月 [査読有り][通常論文]
     
    Fabrication of chiroptical materials with broadband response in the visible light region is vital to fully realize their potential applications. One way to achieve broadband chiroptical activity is to fabricate chiral nanostructures from materials that exhibit broadband absorption in the visible light region. However, the compounds used for chiroptical materials have predominantly been limited to materials with narrowband spectral response. Here, we synthesize Ag2S-based nanohelices derived from helical coordination polymers. The right- and left-handed coordination helices used as precursors are prepared from L- and D-glutathione with Ag+ and a small amount of Cu2+. The pyrolysis of the coordination helices yields right- and left-handed helices of Cu0.12Ag1.94S/C, which exhibit chiroptical activity spanning the entire visible light region. Finite element method simulations substantiate that the broadband chiroptical activity is attributed to synergistic broadband light absorption and light scattering. Furthermore, another series of Cu0.10Ag1.90S/C nanohelices are synthesized by choosing the or D-Glu-Cys as starting materials. The pitch length of nanohelicies is controlled by changing the peptides, which alters their chiroptical properties. The pyrolysis of coordination helices enables one to fabricate helical Ag2S-based materials that enable broadband chiroptical activity but have not been explored owing to the lack of synthetic routes.
  • Shinya Tajima, Yoshiki Kuroshima, Tetsuro Katayama, Naoto Tamai, Kazuki Sada, Kenji Hirai
    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 18 2444 - 2449 2017年05月 [査読有り][通常論文]
     
    The development of synthetic routes to nanomaterials has been motivated by their potential applications in electronics, optics, and catalytic reactions. Solution-based synthesis has relied on organic stabilizers to regulate the crystal growth. Despite the beneficial effect on crystal growth, organic stabilizers attached to the resulting particles reduce the accessibility of reactants and inhibit charge transport, resulting in a lower catalytic activity than expected. In this work we have demonstrated that coordination polymers (CPs) can be used as precursors for photocatalysts without stabilizers. The pyrolysis of CP nanowires of [Cd(l-cysteinate)](n) gave CdS/C nanowires (CdS/C-NWs) that exhibit photocatalytic activity for hydrogen generation superior to CdS nanowires with organic stabilizers (CdS/stb-NWs). Transient absorption spectroscopy showed that CdS/C-NWs provide an active surfaces to facilitate catalytic reactions associated with electron migration. Moreover, Zn-doped CdS nanowires (ZnxCd1-xS/C-NWs) obtained by the pyrolysis of CPs exhibited higher photocatalytic activity than nondoped CdS/C-NWs. The improvement in photocatalytic activity is attributable to the prolonged lifetime of photoexcited electrons. The pyrolysis of CPs provides a facile means to design nanocomposites that realize efficient catalytic reactions associated with facile charge transfer.
  • K. Hirai, K. Sada
    CHEMICAL COMMUNICATIONS 53 38 5275 - 5278 2017年05月 [査読有り][通常論文]
     
    An infrared (IR) laser machine is used for the synthesis of metal-organic frameworks (MOFs). Solutions containing metal ions and organic ligands are casted on glass substrates. MOF crystals are formed at the positions the IR laser irradiated, resulting in the patterning of MOFs.
  • Taisuke Kojima, Kenji Hirai, Yunlong Zhou, Priyan Weerappuli, Shuichi Takayama, Nicholas A. Kotov
    LANGMUIR 32 47 12468 - 12475 2016年11月 [査読有り][通常論文]
     
    The self-assembly of nanoparticles (NPs) is essential for emerging dispersion-based energy-conscious technologies. Of particular interest are micro- and macro scale self-organizing superstructures that can bridge 2D/3D processing scales. Here we report the spontaneous assembly of CdTe NPs within an aqueous microdroplet suspended in soybean oil. The gradual diffusion of the water into the surrounding medium results in shrinking of the microdroplet, and a concomitant formation of branched assemblies from CdTe NPs that evolve in size from similar to 50 mu m to similar to 1000 mu m. The fractal dimension of NP assemblies increases from similar to 1.7 to similar to 1.9 during the assembly process. We found that constituents of the soybean oil enter the aqueous solution across the microdroplet interface and affect NP assembly. The obtained NP dendrites can be further altered morphologically by illumination with light that results in the disassembly of the NP dendrites. The use of this microheterogeneous dispersion platform with partially soluble hydrophilic and hydrophobic solvents highlights the sensitivity of the NP assembly process to environment and presents an opportunity to explore droplet-confined NP assembly.
  • Kenji Hirai, Shigehito Isobe, Kazuki Sada
    SCIENTIFIC REPORTS 5 18468  2015年12月 [査読有り][通常論文]
     
    Central in material design of metal oxides is the increase of surface area and control of intrinsic electronic and optical properties, because of potential applications for energy storage, photocatalysis and photovoltaics. Here, we disclose a facile method, inspired by geochemical process, which gives rise to mesoporous anion-doped metal oxides. As a model system, we demonstrate that simple calcination of a multinuclear coordination cluster results in synchronic chemical reactions: thermal oxidation of Ti8O10(4-aminobenzoate)(12) and generation of gases including amino-group fragments. The gas generation during the thermal oxidation of Ti8O10(4-aminobenzoate)(12) creates mesoporosity in TiO2. Concurrently, nitrogen atoms contained in the gases are doped into TiO2, thus leading to the formation of mesoporous N-doped TiO2. The mesoporous N-doped TiO2 can be easily synthesized by calcination of the multinuclear coordination cluster, but shows better photocatalytic activity than the one prepared by a conventional sol-gel method. Owing to an intrinsic designability of coordination compounds, this facile synthetic will be applicable to a wide range of metal oxides and anion dopants.
  • Kenji Hirai, Bongjun Yeom, Shu-Hao Chang, Hang Chi, John F. Mansfield, Byeongdu Lee, Sungsik Lee, Ctirad Uher, Nicholas A. Kotov
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 54 31 8966 - 8970 2015年07月 [査読有り][通常論文]
     
    Supramolecular chemistry utilizes coordination bonds to assemble molecular building blocks into a variety of sophisticated constructs. However, traditional coordination assemblies are based on organic compounds that have limited ability to transport charge. Herein, we describe coordination assembly of anisotropic FeS2 pyrite nanoparticles (NPs) that can facilitate charge transport. Zn2+ ions form supramolecular complexes with carboxylate end-groups on NP surface, leading to multiparticle sheets with liquid-crystal-like organization. Conductivity and Hall carrier mobility of the p-type layered semiconductor films with Zn2+ coordination bridging exceed those known for coordination compounds, some by several orders of magnitude. The nanoscale porosity of the assembled sheets combined with fast hole transport leads to high electrocatalytic activity of the NP films. The coordination assembly of NPs embraces the versatility of several types of building blocks and opens a new design space for self-organized materials combining nanoscale and supramolecular structural motifs.
  • Kenji Hirai, Julien Reboul, Nobuhiro Morone, John E. Heuser, Shuhei Furukawa, Susumu Kitagawa
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 136 42 14966 - 14973 2014年10月 [査読有り][通常論文]
     
    Porous coordination polymers (PCPs) are an intriguing class of molecular-based materials because of the designability of framework scaffolds, pore sizes and pore surface functionalities. Besides the structural designability at the molecular scale, the structuring of PCPs into mesoscopic/macroscopic morphologies has attracted much attention due to the significance for the practical applications. The structuring of PCPs at the mesoscopic/macroscopic scale has been so far demonstrated by the spatial localization of coordination reactions on the surface of templates or at the phase boundaries. However, these methodologies have never been applied to the fabrication of solid-solution or multivariate metalorganic frameworks (MOFs), in which multiple components are homogeneously mixed. Herein, we demonstrate the structuring of a box-type superstructure comprising of a solid-solution PCP by integrating a bidirectional diffusion of multiple organic ligands into molecular assembly. The parent crystals of [Zn2(ndc)(2)(bpy)](n) were placed in the DMF solution of additional organic component of H(2)bdc, and the temperature was rapidly elevated up to 80 degrees C (ndc = 1,4-naphthalenedicarboxylate, bpy = 4,4'-bipyridyl, bdc = 1,4-benzenedicarboxylate). The dissolution of the parent crystals induced the outward diffusion of components; contrariwise, the accumulation of the other organic ligand of H(2)bdc induced the inward diffusion toward the surface of the parent crystals. This bidirectional diffusion of multiple components spatially localized the recrystallization at the surface of cuboid parent crystals; therefore, the nanocrystals of a solid-solution PCP ([Zn-2(bdc)(1.5)(ndc)(0.5)(bpy)](n)) were organized into a mesoscopic box superstructure. Furthermore, we demonstrated that the box superstructures enhanced the mass transfer kinetics for the separation of hydrocarbons.
  • Wakaoka T, Hirai K, Murayama K, Takano Y, Takagi H, Furukawa S, Kitagawa S
    Journal of Materials Chemistry C 2 35 7173 - 7175 2014年09月 [査読有り][通常論文]
     
    Ultra-small CdSe nanoparticles (similar to 2 nm) were synthesised in the pores of a metal-organic framework, MIL-101(Al)-NH2, using a stepwise injection-reaction protocol. Electron microscopy measurements showed that the nanoparticles were densely packed due to the highly ordered pores of the MOF.
  • Mio Kondo, Shuhei Furukawa, Kenji Hirai, Takaaki Tsuruoka, Julien Reboul, Hiromitsu Uehara, Stephane Diring, Yoko Sakata, Osami Sakata, Susumu Kitagawa
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 136 13 4938 - 4944 2014年04月 [査読有り][通常論文]
     
    Structural transformability accompanied by molecular accommodation is a distinguished feature of porous coordination polymers (PCPs) among porous materials. Conventional X-ray crystallography allows for the determination of each structural phase emerged during transformation. However, the propagation mechanism of transformation through an entire crystal still remains in question. Here we elucidate the structural nature of the spatial transient state, in which two different but correlated framework structures, an original phase and a deformed phase, simultaneously exist in one crystal. The deformed phase is distinctively generated only at the crystal surface region by introducing large guest molecules, while the remaining part of crystal containing small molecules maintains the original phase. By means of grazing incidence diffraction techniques we determine that the framework is sheared with sharing one edge of the original primitive cubic structure, leading to the formation of crystal domains with four mirror image relationships.
  • Hirai K, Falcaro P, Kitagawa S, Furukawa S
    Structure and Bonding 157 167 - 186 2014年 [査読有り][通常論文]
     
    The assembly of metal ions and organic linkers gives the highly regulated framework scaffolds, the so-called metal-organic framework (MOFs) or porous coordination polymers (PCPs). MOFs offer fascinating platforms in which light emitting components can be rationally incorporated. A variety of metal ions and organic linkers can be used to fabricate the MOF materials with a wide range of emissive properties. Besides their inherent luminescent properties, the permanent porosity of MOFs enables to accommodate guest species therein. The accommodation of guests in the pores results in the shift of emission wavelength, the change of emission intensity or even the generation of new emission bands. Therefore, the luminescent MOFs can be potentially exploited as a chemical sensor for small molecules or ions. In this chapter, we present a variety of luminescent properties derived from the guest accommodation in MOFs, and we discuss potential applications of luminescent MOFs as sensing materials.
  • Kenji Hirai, Kenji Sumida, Mikhail Meilikhov, Nicolas Louvain, Masashi Nakahama, Hiromitsu Uehara, Susumu Kitagawa, Shuhei Furukawa
    JOURNAL OF MATERIALS CHEMISTRY C 2 17 3336 - 3344 2014年 [査読有り][通常論文]
     
    The hybridization of porous coordination polymers (PCPs) with electronic devices is a powerful strategy for developing systems that are suitable for advanced applications, such as chemical sensing. The quartz crystal microbalance (QCM) technique is one that allows minute mass changes to be resolved with a high temporal resolution, and the growth of PCP crystals that provide selective adsorption properties on a QCM substrate can facilitate the rapid detection of certain molecules from a gas or vapour mixture. Herein, we demonstrate the immobilization of the flexible PCP Zn(NO2- ip)(bpy) (Zn-CID-5; NO2- ip(2-) = 5- nitroisophthalate, bpy= 4,4' bipyridine) on QCM substrates and investigate the adsorptive properties of the fabricated systems. Notably, the crystal orientation could be controlled by the anchoring of chemical functionalities on the substrate surface, or by the addition of coordination modulators (e. g. 4-phenylpyridine) at the time of growth of the PCP crystals on the substrates. Here, the crystal orientation plays a significant role in determining the detection kinetics of organic vapours (e. g. methanol), and the [010]-oriented case which displays the fastest adsorption kinetics among the samples tested is studied under mixed component (methanol-hexane) conditions to demonstrate its response profile. In all, the results demonstrate the potential utility of PCP/QCM hybrid systems in sensor applications, and also serve to highlight the importance of optimizing the physical orientation of crystal growth in such systems to maximize the overall performance of the system.
  • Mikhail Meilikhov, Shuhei Furukawa, Kenji Hirai, Roland A. Fischer, Susumu Kitagawa
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 52 1 341 - 345 2013年 [査読有り][通常論文]
  • Yoko Sakata, Shuhei Furukawa, Mio Kondo, Kenji Hirai, Nao Horike, Yohei Takashima, Hiromitsu Uehara, Nicolas Louvain, Mikhail Meilikhov, Takaaki Tsuruoka, Seiji Isoda, Wataru Kosaka, Osami Sakata, Susumu Kitagawa
    SCIENCE 339 6116 193 - 196 2013年01月 [査読有り][通常論文]
     
    Flexible porous coordination polymers change their structure in response to molecular incorporation but recover their original configuration after the guest has been removed. We demonstrated that the crystal downsizing of twofold interpenetrated frameworks of [Cu-2(dicarboxylate)(2)(amine)](n) regulates the structural flexibility and induces a shape-memory effect in the coordination frameworks. In addition to the two structures that contribute to the sorption process (that is, a nonporous closed phase and a guest-included open phase), we isolated an unusual, metastable open dried phase when downsizing the crystals to the mesoscale, and the closed phase was recovered by thermal treatment. Crystal downsizing suppressed the structural mobility and stabilized the open dried phase. The successful isolation of two interconvertible empty phases, the closed phase and the open dried phase, provided switchable sorption properties with or without gate-opening behavior.
  • Kenji Hirai, Kebi Chen, Tomohiro Fukushima, Satoshi Horike, Mio Kondo, Nicolas Louvain, Chiwon Kim, Yoko Sakata, Mikhail Meilikhov, Osami Sakata, Susumu Kitagawa, Shuhei Furukawa
    DALTON TRANSACTIONS 42 45 15868 - 15872 2013年 [査読有り][通常論文]
     
    Hybridized porous coordination polymers (PCPs) are synthesized through epitaxial growth or ligand replacement. Whereas epitaxial growth on the core crystal leads to a sandwich type PCP, ligand replacement near the surface of core crystal results in a core-shell type PCP.
  • Julien Reboul, Shuhei Furukawa, Nao Horike, Manuel Tsotsalas, Kenji Hirai, Hiromitsu Uehara, Mio Kondo, Nicolas Louvain, Osami Sakata, Susumu Kitagawa
    NATURE MATERIALS 11 8 717 - 723 2012年08月 [査読有り][通常論文]
     
    The spatial organization of porous coordination polymer (PCP) crystals into higher-order structures is critical for their integration into separation systems, heterogeneous catalysts, ion/electron transport and photonic devices. Here, we demonstrate a rapid method to spatially control the nucleation site, leading to the formation of mesoscopic architecture made of PCPs, in both two and three dimensions. Inspired by geological processes, this method relies on the morphological replacement of a shaped sacrificial metal oxide used both as a metal source and as an 'architecture-directing agent' by an analogous PCP architecture. Spatiotemporal harmonization of the metal oxide dissolution and the PCP crystallization allowed the preservation of very fine mineral morphological details of periodic alumina inverse opal structures. The replication of randomly structured alumina aerogels resulted in a PCP architecture with hierarchical porosity in which the hydrophobic micropores of the PCP and the mesopores/macropores inherited from the parent aerogels synergistically enhanced the material's selectivity and mass transfer for water/ethanol separation.
  • Kenji Hirai, Hiromitsu Uehara, Susumu Kitagawa, Shuhei Furukawa
    DALTON TRANSACTIONS 41 14 3924 - 3927 2012年 [査読有り][通常論文]
     
    A series of 1,1'-ferrocenedicarboxylate-based two-dimensional porous coordination polymers were synthesized by incorporating different diamine co-ligands. These compounds immobilized on electrodes, exhibited reversible redox reactions, arising from ferrocenyl moiety.
  • Kenji Hirai, Shuhei Furukawa, Mio Kondo, Mikhail Meilikhov, Yoko Sakata, Osami Sakata, Susumu Kitagawa
    CHEMICAL COMMUNICATIONS 48 52 6472 - 6474 2012年 [査読有り][通常論文]
     
    Spatiospecific functionalisation of a shell crystal was performed in a core-shell crystal of a porous coordination polymer (PCP) via post-synthetic modification (PSM). The shell crystal allowed the core crystal to selectively accumulate N,N-dimethylaniline (DMA) and afford the intense exciplex fluorescence.
  • Michael Maes, Stijn Schouteden, Kenji Hirai, Shuhei Furukawa, Susumu Kitagawa, Dirk E. De Vos
    LANGMUIR 27 15 9083 - 9087 2011年08月 [査読有り][通常論文]
     
    The porous coordination polymer (PCP) [Cu-2(BDC)(2)(dabco)] is capable of selectively adsorbing up to 25 wt % of either 1-methylnaphthalene or 2-methylnaphthalene. Uptakes of unsubstituted naphthalene and 1,4-dimethyl-naphthalene are significantly lower (7-13 wt %), suggesting that monomethyl substituted polyaromatics can be separated from the other fractions. Furthermore, this PCP can perform the difficult separation of 1-methylnaphthalene from 2-methylnaphthalene with separation factors as high as 2.6, proving that specific interactions of the methyl group with the lattice play an important role in determining the adsorption selectivity.
  • Hiromitsu Uehara, Stephane Diring, Shuhei Furukawa, Ziya Kalay, Manuel Tsotsalas, Masashi Nakahama, Kenji Hirai, Mio Kondo, Osami Sakata, Susumu Kitagawa
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 133 31 11932 - 11935 2011年08月 [査読有り][通常論文]
     
    A new strategy to synthesize mono dispersed porous coordination polymer (PCP) nanocrystals at room temperature was developed and utilized for the formation of PCP thin films on gold substrates with fine control over the crystal sizes using the coordination modulation method. Hybridization of these PCP thin films with an environment-controlled quartz crystal microbalance system allowed determining the adsorption properties for organic vapors (methanol and hexane). In the case of high sensitivity (at the low-concentration dosing of analytes), the sensor response depended on the crystal size but not on the type of analyte. In contrast, at the high-concentration dosing, a clear dependence of the sorption kinetics on the analyte was observed due to significant sorbate-sorbate interaction.
  • O. Shekhah, K. Hirai, H. Wang, H. Uehara, M. Kondo, S. Diring, D. Zacher, R. A. Fischer, O. Sakata, S. Kitagawa, S. Furukawa, C. Woell
    DALTON TRANSACTIONS 40 18 4954 - 4958 2011年 [査読有り][通常論文]
     
    We report the successful heteroepitaxial growth of perfectly oriented hybrid MOF thin films. By employing step-by-step liquid-phase epitaxy (LPE), [Zn-2(ndc)(2)(dabco)](n) was grown on [Cu-2(ndc)(2)(dabco)](n), thus demonstrating that the MOF-on-MOF deposition scheme developed for powdered microcrystalline MOF materials can also be applied in connection with LPE for MOF thin films or multilayers. The deposition was monitored by surface plasmon resonance (SPR) spectroscopy, the resulting MOF heterostructures were characterized using IR spectroscopy and different types of X-ray diffraction (XRD)-based techniques. The results suggest that the LPE method is a promising way to fabricate and grow MOF heterostructures, and also demonstrates the potential of [Cu-2(ndc)(2)(dabco)](n) MOF thin films as substrates for the LPE-based growth of different MOFs on top.
  • Kenji Hirai, Shuhei Furukawa, Mio Kondo, Hiromitsu Uehara, Osami Sakata, Susumu Kitagawa
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 50 35 8057 - 8061 2011年 [査読有り][通常論文]
  • Mio Kondo, Shuhei Furukawa, Kenji Hirai, Susumu Kitagawa
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 49 31 5327 - 5330 2010年 [査読有り][通常論文]
  • Shuhei Furukawa, Kenji Hirai, Keiji Nakagawa, Yohei Takashima, Ryotaro Matsuda, Takaaki Tsuruoka, Mio Kondo, Rie Haruki, Daisuke Tanaka, Hirotoshi Sakamoto, Satoru Shimomura, Osami Sakata, Susumu Kitagawa
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 48 10 1766 - 1770 2009年 [査読有り][通常論文]
  • Shuhei Furukawa, Kenji Hirai, Yohei Takashima, Keiji Nakagawa, Mio Kondo, Takaaki Tsuruoka, Osami Sakata, Susumu Kitagawa
    CHEMICAL COMMUNICATIONS 34 5097 - 5099 2009年 [査読有り][通常論文]
     
    Two porous coordination polymers (PCPs) with different pore surface functionality were integrated into one single crystal by face-selective epitaxial growth, leading to BAB-type block PCP crystals with the core crystal A between the second crystals B.

書籍

その他活動・業績

  • Shuichi Toyouchi, Tomoko Inose, Kenji Hirai, Hiroshi Uji-i Photosynergetic Responses in Molecules and Molecular Aggregates 117 -133 2020年09月 [査読無し][通常論文]
  • 光共振器で化学反応を制御─量子ゆらぎと有機反応の接点
    平井健二 化学 2020年6月号 12 -15 2020年05月 [査読無し][通常論文]
  • プラズモン導波路を用いた単一細胞解析と操作
    豊内秀一, 猪瀬朋子, 平井健二, 雲林院宏 月刊「細胞」2020年 2月号 51 -54 2020年 [査読無し][通常論文]
  • 平井 健二, 北川 進 科学と工業 86 (5) 151 -155 2012年05月 [査読無し][通常論文]
  • 多孔性金属錯体(PCP/MOF)の表面化学
    平井健二, 古川修平 表面科学会誌 33 519 -523 2012年 [査読無し][通常論文]
  • Multifunctional Porous Crystals by Hybridizing Coordination Polymers
    Kenji Hirai, Osami sakata, Susumu Kitagawa, Shuhei Furukawa SPring-8 Research Frontier 2011 84 -85 2011年 [査読無し][通常論文]
  • Evaluation of Structural Relationship in Hybridized Porous Coordination Polymer Crystals
    Kenji Hirai, Shuhei Furukawa, Osami Sakata, Susumu Kitagawa SPring-8 Research Frontier 2009 98 -99 2010年 [査読無し][通常論文]
  • エピタキシャル成長によるハイブリッド型多孔性錯体結晶の創製
    平井健二 Bulletin of Japan Society of Coordination Chemistry 55 121 -122 2010年 [査読無し][通常論文]

共同研究・競争的資金等の研究課題

  • 光共振器による量子光学現象を利用したイオン伝導度の向上
    日本学術振興会:科学研究費助成事業 基盤研究(B)
    研究期間 : 2021年04月 -2024年03月 
    代表者 : 平井 健二
  • 配位自己集合を用いた量子ドットレーザーの開発
    日本学術振興会:科学研究費助成事業 挑戦的研究(萌芽)
    研究期間 : 2020年07月 -2023年03月 
    代表者 : 平井 健二
  • ラビ分裂による化学反応操作法の確立
    科学技術振興機構:さきがけ研究
    研究期間 : 2018年10月 -2022年03月 
    代表者 : 平井 健二
  • レーザー加熱による機能性材料の3次元合成
    日本学術振興会:科学研究費助成事業 基盤研究(B)
    研究期間 : 2018年04月 -2021年03月 
    代表者 : 平井 健二
  • 振動励起による自己集合マニュピレーション
    日本学術振興会:科学研究費助成事業 挑戦的研究(萌芽)
    研究期間 : 2018年06月 -2020年03月 
    代表者 : 平井 健二
  • 配位高分子の犠牲鋳型法による無機酸化物のマルチスケール構造制御
    日本学術振興会:科学研究費助成事業 若手研究(B)
    研究期間 : 2016年04月 -2018年03月 
    代表者 : 平井 健二

教育活動情報

主要な担当授業

  • ナノマテリアル特論
    開講年度 : 2019年
    課程区分 : 修士課程
    開講学部 : 情報科学研究科
    キーワード : ナノ材料、ナノテクノロジー、光物理、光科学、バイオテクノロジー
  • ナノマテリアル特論
    開講年度 : 2019年
    課程区分 : 修士課程
    開講学部 : 情報科学院
    キーワード : ナノ材料、ナノテクノロジー、光物理、光科学、バイオテクノロジー
  • 大学院共通授業科目(一般科目):自然科学・応用科学
    開講年度 : 2019年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : Science education, basic research, materials science, molecular science, nanoscience, nanotechnology, bioimaging, drug delivery, energy harvesting, nanomaterials, polymers, plasmonics, optical spectroscopy, optical microscopy
  • ナノマテリアル特論
    開講年度 : 2019年
    課程区分 : 博士後期課程
    開講学部 : 情報科学研究科
    キーワード : ナノ材料、ナノテクノロジー、光物理、光科学、バイオテクノロジー
  • ナノマテリアル特論
    開講年度 : 2019年
    課程区分 : 博士後期課程
    開講学部 : 情報科学院
    キーワード : ナノ材料、ナノテクノロジー、光物理、光科学、バイオテクノロジー
  • 物理学Ⅰ
    開講年度 : 2019年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 運動、力、運動の法則、仕事、エネルギー、運動量、保存則、剛体、流体、単振動、音と光、干渉、回折
  • 生体情報工学演習Ⅱ
    開講年度 : 2019年
    課程区分 : 学士課程
    開講学部 : 工学部
    キーワード : 数値計算法,シミュレーション,統計と検定,データベース,情報検索


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