Researcher basic information

• bijuvpillai

• PhD

• https://researchmap.jp/read0120893?lang=en

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200901096020953212
• https://bijulab.main.jp/en/

• 200901096020953212

• Nanotechnology/Materials, Nanomaterials, Photochemistry, Physical Chemistry, Materials Science, Quantum Dots, Single Molecules

• Master's degree program, Graduate School of Environmental Science
• Doctoral (PhD) degree program, Graduate School of Environmental Science

Research activity information

• Jun. 2024, Hokkaido University, The Presidential Award
  Vasudevan Biju
• Sep. 2023, The Japanese Photochemistry Association, The Japanese Photochemistry Association Award
• Sep. 2018, SERB, Department of Science and Technology, Government of India, SPARC Fellow
• Aug. 2018, Department of Higher Education, Government of Kerala, India, Erudite Scholar
• Mar. 2016, Ozaki Foundation, Gen'nai Award (源内賞)
• Sep. 2011, Japanese Photochemistry Association, Young Scientist Award
• Mar. 2011, The Chemical Society of Japan, Lectureship Prize
• Nov. 2010, The Royal Society of Chemistry, England, Fellow of the Royal Society of Chemistry
• Oct. 2010, Japan Science and Technology Agency (JST), PRESTO
• Oct. 2010, Asian and Oceanian Photochemistry Association (APA), Young Scientist Award
• Mar. 2010, The Chemical Society of Japan, Distinguished Lectureship Award
• Mar. 2008, Ozaki Foundation, Gen'nai Encouragement Award (源内奨励賞)
• Mar. 2002, Japan Society for the Promotion of Science (JSPS), JSPS Postdoctoral Fellowship
• Dec. 1995, Government of India, UGC-CSIR NET and JRF
• Mar. 1988, Children's Friend High School, Kottiyam, Thomas Memorial School Topper Award

• Photoluminescence Enhancement in Zero-Dimensional Hybrid Copper Halide Single Crystals
  Rahul Ghosh Dastidar; Takuya Okamoto; Kiyonori Takahashi; Shailesh Rana; Kamlesh Awasthi; Nobuhiro Ohta; Challapalli Subrahmanyam; Vasudevanpillai Biju
  CHEMISTRY OF MATERIALS, 22 Dec. 2025
  English, Scientific journal
• Photoluminescence enhancement by exciton-plasmon coupling in MAPbI₃ quantum dots on gold nanorods
  Tianci Wang; Tetsuro Katayama; Xu Shi; Akihiro Furube; Takuya Okamoto; Vasudevanpillai Biju
  NPG ASIA MATERIALS, 17, 1, 28 Nov. 2025
  English, Scientific journal
• Amplified emission from halide perovskite quantum dots by exciton-plasmon-coupled energy transfer in the neutral and trion states on gold nanoparticles
  Bhagyashree Mahesha Sachith; Yifei Xia; Tianci Wang; Takuya Okamoto; Syoji Ito; Li Wang; Xu Shi; Naoto Tamai; Hiroshi Miyasaka; Hiroaki Misawa; Vasudevanpillai Biju
  JOURNAL OF MATERIALS CHEMISTRY A, 17 Nov. 2025
  English, Scientific journal
• Near infrared light-assisted photoelectrochemical conversion and environmental remediation
  Mohit Kumar; Phyu Phyu Cho; Rajesh Kumar Sethi; Vasudevanpillai Biju; Challapalli Subrahmanyam
  Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 64, 100710, 100710, Elsevier BV, Aug. 2025, [Peer-reviewed], [Corresponding author]
  English, Scientific journal
• Modulating Band Alignment and Passivating Defects with In‐Situ Bi‐Substituted Cu₂ZnSnS₄ for Superior Photo‐/Electrochemical Water Splitting
  Mohit Kumar; Palak Chugh; Takuya Okamoto; Arup Mahata; Vasudevanpillai Biju; Subrahmanyam Challapalli
  Small, 21, 36, Wiley, 31 Jul. 2025, [Peer-reviewed], [Corresponding author]
  English, Scientific journal, Abstract
  
  Tailoring semiconductor properties through cation substitution is a promising strategy to improve the intrinsic properties of a photoabsorber material by improving charge carrier statistics, kinetics, and efficiency of photo‐/electrocatalytic conversions. In the current study, Cu₂ZnSnS₄ (CZTS) thin film photocathodes are investigated by partially replacing Zn with Bi by fabricating Cu₂Zn_1−xBi_xSnS₄ (x = 0.02, 0.04, 0.06, and 0.08) (x‐CZBTS; x: 2, 4, 6, and 8) thin films. Incorporating Bi replacing Zn reduce bulk defects, secondary phases, and Cu_Zn antisites and promote ease of crystallization with a decrease in crystallization temperature. Bi‐doping modulates the CZTS film band‐gap with a greater absorption coefficient, red shift, and charge collection. CZBTS coated with CdS/Pt (x‐CZBTS‐cp) films delivered photocurrent density (−4.0, −7.2, −5.2, and −1.3 mA cm⁻² at 0 V_RHE for x: 2, 4, 6, and 8, respectively). 4‐CZBTS‐cp with the highest J (η_STH = 1.62% at 0.45 V_RHE, 95 µmol cm⁻² h⁻¹ H₂ evolution, F.E. = 90%, and E_onset = 0.71V_RHE) showed 82% photocurrent density retention after 10h in 1 m kPi buffer (pH 7). DFT and experimental studies underscore improved PEC performance owing to significant Bi contribution in conduction band of CZBTS, lowering bandgap, elongating photogenerated charge carrier lifetime, rapid charge separation/transport, and charge accumulation at the Bi−S site on the surface with optimal Gibbs free energy (ΔG_H*) for CZBTS on photoexcitation.
• Organic Electron Acceptors for FAPbI3 Perovskites in Solutions and Solar Cells
  Kangjian Xu; Palyam Subramanyam; Takuya Okamoto; Ch Subrahmanyam; Vasudevanpillai Biju
  Journal of Physical Chemistry C, 129, 3, 1569, 1574, 23 Jan. 2025
  Scientific journal
• Adaptable Blueprint for Non-metal Near-Infrared Organic Photocatalysts by Aromatic Sulfones
  Kazuya Yoshida; Toshiaki Suzuki; Vasudevanpillai Biju; Yuta Takano
  ACS Applied Materials & Interfaces, 17, 3, 4813, 4820, American Chemical Society (ACS), 13 Jan. 2025
  Scientific journal
• Exploring photo-excited states of aromatic sulfones for efficient near-infrared-activated photothermal cancer therapy
  Kazuya Yoshida; Toshiaki Suzuki; Yasuko Osakada; Mamoru Fujitsuka; Yukiko Miyatake; Vasudevanpillai Biju; Yuta Takano
  Bulletin of the Chemical Society of Japan, 98, 1, Oxford University Press (OUP), 08 Jan. 2025
  Scientific journal, Abstract
  
  Near-infrared light activation enhances phototherapeutic efficacy due to deep-tissue penetration and minimal invasion. While near-infrared-phototherapeutic agents are widely studied, conventional designs often increase molecular size, affecting pharmacokinetics. This study elucidates the photo-excited states of sulfone-containing aromatic compounds as efficient near-infrared-activated photothermal agents for cancer therapy. We synthesized sulfone-rosamine compounds (3 and 4) exhibiting strong optical absorption around 700 nm, attributed to a unique orbital in the LUMO. Compound 4, 35% smaller than conventional near-infrared-dye molecules, such as Cy5.5 (0.86 nm3/molecule), enhances intracellular mobility. Upon photoexcitation, 4 undergoes rapid non-radiative relaxation, resulting in remarkable photothermal effects and photostability. Transient absorption spectroscopy and density functional theory calculations revealed a mechanism involving rapid non-radiative deactivation after illumination, efficiently converting light to heat. The near-infrared-induced photothermal effect effectively killed various cancer cell lines, including HeLa, MDA-MB-231, and PCI-55. This study provides guidelines for designing novel photodrugs with improved intracellular mobility, near-infrared light responsiveness, and photostability, and introduces the advancement of cancer treatment.
• Colloidally synthesized and bandgap-engineered luminescent titanium nitride quantum dots
  Aswathi Maladan; Takuya Okamoto; Mohit Kumar; Most Farida Khatun; Yasutaka Matsuo; Challapalli Subrahmanyam; Vasudevanpillai Biju
  Nanoscale, 17, 44, 25484, 25489, Royal Society of Chemistry (RSC), 2025
  Scientific journal, We demonstrate the colloidal synthesis of luminescent titanium nitride (TiN) quantum dots with multicolor emission and tunable band gaps, providing safer alternatives to metal chalcogenides and halide perovskites for solar cells and LEDs.
• From halide perovskite nanocrystals to supercrystals: fundamentals and applications
  S. L. Aneesha; Yifei Xia; Takuya Okamoto; Deepika Gaur; Sudipta Seth; Johan Hofkens; Lakshminarayana Polavarapu; Vasudevanpillai Biju
  Chemical Society Reviews, 54, 21, 9585, 9611, Royal Society of Chemistry (RSC), 2025
  Scientific journal, Halide perovskite supercrystals (or superlattices) are electronically coupled nanomaterials, such as nanocrystals, quantum dots, or nanoplatelets that offer collective optical and electronic properties distinct from those of their constituents.
• Engineered 2D Boron Nitride Flexible Electrodes for Supercapacitors
  Rosmy Joy; Sumit Chahal; Vasudevanpillai Biju; Prashant Kumar; Suja Haridas
  ACS Applied Energy Materials, 7, 21, 9766, 9774, American Chemical Society (ACS), 24 Oct. 2024, [Peer-reviewed]
  English, Scientific journal
• Transfer of 2D Films: From Imperfection to Perfection
  Phuong V. Pham; The-Hung Mai; Saroj P. Dash; Vasudevanpillai Biju; Yu-Lun Chueh; Deep Jariwala; Vincent Tung
  ACS Nano, 18, 23, 14841, 14876, American Chemical Society (ACS), 29 May 2024, [Peer-reviewed]
  English, Scientific journal
• Bio-catalytic nanoparticle shaping for preparing mesoscopic assemblies of semiconductor quantum dots and organic molecules.
  Rumana Akter; Nicholas Kirkwood; Samantha Zaman; Bang Lu; Tinci Wang; Satoru Takakusagi; Paul Mulvaney; Vasudevanpillai Biju; Yuta Takano
  Nanoscale horizons, 23 May 2024, [International Magazine]
  English, Scientific journal, We report a unique bio-catalytic nanoparticle shaping (BNS) method for preparing a variety of mesoscopic particles by a facile process. For example, the BNS method affords mesoscopic QD assembly dispersions. Large-size sedimentations (>1 μm) of QDs are first formed using oligo-L-lysine linkers. These then undergo controlled enzymatic cleavage of the linkers using trypsin, which surprisingly leads to mesoscopic particles about 84 nm in size with a narrow size distribution. A detailed mechanism of the BNS method is investigated using tetrakis(4-carboxyphenyl)porphyrin (TCPP), instead of QDs, as a probe molecule. Interestingly, the BNS method can also be applied to other combinations of enzymes and enzymatically degradable linkers, such as hyaluronidase with hyaluronan. As a potential application, the mesoscopic particles of QDs and oligo-lysine exhibit their ability to act as a drug delivery carrier originating from the features of both QDs and oligo-lysine. The BNS method demonstrates the universality and versatility of preparing mesoscopic particles and opens new doors for studying QD assemblies and molecular-based mesoscopic particles.
• Distance-Dependent Energy Transfer under Modal Strong Coupling from CdSe/ZnS Quantum Dots to a Plasmonic Fabry–Pérot Cavity
  Takuya Okamoto; Azusa Onishi; Xu Shi; Tomoya Oshikiri; Kosei Ueno; Hiroaki Misawa; Vasudevanpillai Biju
  The Journal of Physical Chemistry C, 128, 10, 4208, 4214, American Chemical Society (ACS), 28 Feb. 2024, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  Scientific journal
• Photosensitizer-singlet oxygen sensor conjugated silica nanoparticles for photodynamic therapy and bioimaging.
  Jeladhara Sobhanan; Kenji Ono; Takuya Okamoto; Makoto Sawada; Paul S Weiss; Vasudevanpillai Biju
  Chemical Science, 15, 6, 2007, 2018, 07 Feb. 2024, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Intracellular singlet oxygen (1O2) generation and detection help optimize the outcome of photodynamic therapy (PDT). Theranostics programmed for on-demand phototriggered 1O2 release and bioimaging have great potential to transform PDT. We demonstrate an ultrasensitive fluorescence turn-on sensor-sensitizer-RGD peptide-silica nanoarchitecture and its 1O2 generation-releasing-storing-sensing properties at the single-particle level or in living cells. The sensor and sensitizer in the nanoarchitecture are an aminomethyl anthracene (AMA)-coumarin dyad and a porphyrin or CdSe/ZnS quantum dots (QDs), respectively. The AMA in the dyad quantitatively quenches the fluorescence of coumarin by intramolecular electron transfer, the porphyrin or QD moiety generates 1O2, and the RGD peptide facilitates intracellular delivery. The small size, below 200 nm, as verified by scanning electron microscopy and differential light scattering measurements, of the architecture within the 1O2 diffusion length enables fast and efficient intracellular fluorescence switching by the tandem ultraviolet (UV)-visible or visible-near-infrared (NIR) photo-triggering. While the red emission and 1O2 generation by the porphyrin are continually turned on, the blue emission of coumarin is uncaged into 230-fold intensity enhancement by on-demand photo-triggering. The 1O2 production and release by the nanoarchitecture enable spectro-temporally controlled cell imaging and apoptotic cell death; the latter is verified from cytotoxic data under dark and phototriggering conditions. Furthermore, the bioimaging potential of the TCPP-based nanoarchitecture is examined in vivo in B6 mice.
• Dual-color photoluminescence modulation of zero-dimensional hybrid copper halide microcrystals.
  Rahul Ghosh Dastidar; Takuya Okamoto; Kiyonori Takahashi; Yuta Takano; Chakkooth Vijayakumar; Challapalli Subrahmanyam; Vasudevanpillai Biju
  Nanoscale, 16 Jan. 2024, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Zero-dimensional hybrid copper(I) halides (HCHs) are attractive due to their interesting photoluminescence (PL) properties and the high abundance and low toxicity of copper. In this study, we report green-red dual emission from rhombic 1-butyl-1-methyl piperidinium copper bromide [(Bmpip)2Cu2Br4] microcrystals (MCs) prepared on borosilicate glass. The structure and elemental composition of the MCs are characterized by single crystal X-ray diffraction analysis, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Interestingly, MCs prepared on an ITO-coated glass plate show an intense green emission compared to the dual emission on a bare glass or plastic substrate. Furthermore, the intensity of the green emission from the MC is enormously increased by powdering using a conductive material, suggesting the deactivation of the red-emitting state by a charge transfer interaction with the conductor. These findings open a new strategy to suppress the self-trapping of excitons by longitudinal optical phonons and control the dual emitting states in HCHs.
• Multidisciplinary Science and Academic Collaborations Empowered by Photochemistry Societies and Conferences
  Vasudevan Pillai Biju
  Photochemistry, 55, 1, 2024, [Invited], [Lead author]
  English, Scientific journal
• Thermally Induced Reversible Fluorochromism by Self-Trapped Excitonic Emission in a Two-Dimensional Hybrid Copper(I)-Halide Single Crystal
  Amarjith V Dev; Manasa G. Basavarajappa; Swapnil S. Deshpande; Poulomi Mukherjee; Avija Ajayakumar; Chinnadurai Muthu; Takuya Okamoto; Sudip Chakraborty; D. D. Sarma; Vasudevanpillai Biju; Chakkooth Vijayakumar
  Chemistry of Materials, 2024
  Scientific journal
• π-extended porphyrin-based near-infrared photosensitizers for mitochondria-targeted photodynamic therapy
  Hanjun Zhao; Rina Naganawa; Yuma Yamada; Yasuko Osakada; Mamoru Fujitsuka; Hideyuki Mitomo; Yukiko Miyatake; Hideyoshi Harashima; Vasudevanpillai Biju; Yuta Takano
  Journal of Photochemistry and Photobiology A: Chemistry, 115397, 115397, Elsevier BV, Dec. 2023, [Peer-reviewed], [Corresponding author]
  Scientific journal
• Lead‐Free Halide Perovskite Materials and Optoelectronic Devices: Progress and Prospective
  Iago López‐Fernández; Donato Valli; Chun‐Yun Wang; Subarna Samanta; Takuya Okamoto; Yi‐Teng Huang; Kun Sun; Yang Liu; Vladimir S. Chirvony; Avijit Patra; Juliette Zito; Luca De Trizio; Deepika Gaur; Hong‐Tao Sun; Zhiguo Xia; Xiaoming Li; Haibo Zeng; Iván Mora‐Seró; Narayan Pradhan; Juan P. Martínez‐Pastor; Peter Müller‐Buschbaum; Vasudevanpillai Biju; Tushar Debnath; Michael Saliba; Elke Debroye; Robert L. Z. Hoye; Ivan Infante; Liberato Manna; Lakshminarayana Polavarapu
  Advanced Functional Materials, 34, 6, Wiley, 27 Oct. 2023, [Peer-reviewed]
  Scientific journal, Abstract
  
  Halide perovskites, in the form of thin films and colloidal nanocrystals, have recently taken semiconductor optoelectronics research by storm, and have emerged as promising candidates for high‐performance solar cells, light‐emitting diodes (LEDs), lasers, photodetectors, and radiation detectors. The impressive optical and optoelectronic properties, along with the rapid increase in efficiencies of solar cells and LEDs, have greatly attracted researchers across many disciplines. However, most advances made so far in terms of preparation (colloidal nanocrystals and thin films), and the devices with highest efficiencies are based on Pb‐based halide perovskites, which have raised concerns over their commercialization due to the toxicity of Pb. This has triggered the search for lower‐toxicity Pb‐free halide perovskites and has led to significant progress in the last few years. In this roadmap review, researchers of different expertise have joined together to summarize the latest progress, outstanding challenges, and future directions of Pb‐free halide perovskite thin films and nanocrystals, regarding their synthesis, optical spectroscopy, and optoelectronic devices, to guide the researchers currently working in this area as well as those that will join the field in the future.
• Self-assembled halide perovskite quantum dots in polymer thin films showing temperature-controlled exciton recombination.
  Most Farida Khatun; Takuya Okamoto; Vasudevanpillai Biju
  Chemical communications (Cambridge, England), 20 Oct. 2023, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Rationally assembled supramolecular structures of organic chromophores or semiconductor nanomaterials show excitonic properties different from individual molecules or nanoparticles. We report polymer-assisted assembly formation and thermal modulation of excitonic recombination in self-assembled formamidinium lead bromide perovskite quantum dots.
• Free-standing 2D gallium nitride for electronic, excitonic, spintronic, piezoelectric, thermoplastic, and 6G wireless communication applications
  Tumesh Kumar Sahu; Saroj Pratap Sahu; K. P. S. S. Hembram; Jae-Kap Lee; Vasudevanpillai Biju; Prashant Kumar
  NPG Asia Materials, 15, 1, Springer Science and Business Media LLC, 22 Sep. 2023, [Peer-reviewed], [Corresponding author]
  Scientific journal, Abstract
  
  Two-dimensional gallium nitride (2D GaN) with a large direct bandgap of ~5.3 eV, a high melting temperature of ~2500 °C, and a large Young’s modulus ~20 GPa developed for miniaturized interactive electronic gadgets can function at high thermal and mechanical loading conditions. Having various electronic, optoelectronic, spintronic, energy storage devices and sensors in perspective and the robust nature of 2D GaN, it is highly imperative to explore new pathways for its synthesis. Moreover, free-standing sheets will be desirable for large-area applications. We report our discovery of the synthesis of free-standing 2D GaN atomic sheets employing sonochemical exfoliation and the modified Hummers method. Exfoliated 2D GaN atomic sheets exhibit hexagonal and striped phases with microscale lateral dimensions and excellent chemical phase purity, confirmed by Raman and X-ray photoelectron spectroscopy. 2D GaN is highly stable, as confirmed by TGA measurements. While photodiode, FET, spintronics, and SERS-based molecular sensing, IRS element in 6G wireless communication applications of 2D GaN have been demonstrated, its nanocomposite with PVDF exhibits an excellent thermoplastic and piezoelectric behavior.
• Exploring CuBi₂O₄ as a Promising Photocathode Material for PEC Water Splitting
  Bhagatram Meena; Mohit Kumar; Rosalie K. Hocking; Saulius Juodkazis; Vasudevanpillai Biju; Palyam Subramanyam; Challapalli Subrahmanyam
  Energy & Fuels, 37, 18, 14280, 14289, American Chemical Society (ACS), 05 Sep. 2023, [Peer-reviewed]
  Scientific journal
• Highly Luminescent and Stable Halide Perovskite Nanocrystals by Interfacial Defect Passivation and Amphiphilic Ligand Capping.
  Sushant Ghimire; Most Farida Khatun; Bhagyashree M Sachith; Takuya Okamoto; Jeladhara Sobhanan; Ch Subrahmanyam; Vasudevanpillai Biju
  ACS applied materials & interfaces, 15, 34, 41081, 41091, 30 Aug. 2023, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Halide vacancies cause lattice degradation and nonradiative losses in halide perovskites. In this study, we strategically fill bromide vacancies in CsPbBr3 perovskite nanocrystals with NaBr, KBr, or CsBr at the organic-aqueous interface for hydrophobic ligand-capped nanocrystals or in a polar solvent (2-propanol) for amphiphilic ligand-capped nanocrystals. Energy-dispersive X-ray spectra, powder X-ray diffraction data, and scanning transmission electron microscopy images help us confirm vacancy filling and the structures of samples. The bromide salts increase the photoluminescence quantum yield (98 ± 2%) of CsPbBr3 by decreasing the nonradiative decay rate. Single-particle studies show the quantum yield increase originates from the poorly luminescent nanocrystals becoming highly luminescent after filling vacancies. Furthermore, we tune the optical band gap (ultraviolet-visible-near-infrared) of the hydrophobic ligand-capped nanocrystals by halide exchange at the toluene-water interface using saturated NaCl or NaI solutions, which completes in about 60 min under continuous mixing. In contrast, the amphiphilic ligand accelerates the halide exchange in 2-propanol, suggesting ambipolar functional groups speed up the ion-exchange reaction. The bromide vacancy-filled or halide-exchanged samples in a toluene-water biphasic solvent show higher stability than amphiphilic ligand-capped samples in 2-propanol. This strategy of defect passivation, ion exchange, and ligand chemistry to improve quantum yields and tune band gaps of halide perovskite nanocrystals can be promising for designing stable and water-soluble perovskite samples for solar cells, light-emitting diodes, photodetectors, and photocatalysts.
• Thermodynamically and Kinetically Controlled Nucleation and Growth of Halide Perovskite Single Crystals.
  Dong Zhang; Takuya Okamoto; Vasudevanpillai Biju
  Small (Weinheim an der Bergstrasse, Germany), e2304900, 25 Jul. 2023, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Halide perovskites are ideal for next-generation optical devices and photovoltaics. Although perovskite single-crystals show reproducible optoelectronic properties, significant variations in the crystal size, anisotropy, density, defects, photoluminescence (PL), and carrier lifetime affect the sample properties and device performances. Homogenous size and shape FA/MAPbBr3 single microcrystals (MCs) with controlled edge lengths, crystal densities, PL lifetimes, and PL intensities are prepared by thermodynamically controlling and kinetically separating the crystal nucleation-growth processes using optimum N-cyclohexyl-2-pyrrolidone (CHP) concentration. The crystal growth kinetics at different CHP concentrations and temperatures are estimated spectroscopically by measuring the concentration of Pb (II). High-density cubic MCs with a homogenous size distribution, high PL intensities, and long PL lifetimes are obtained within minutes at high temperatures by the controlled addition of the pyrrolidone derivative. Conversely, the crystal size nonlinearly increases with time at low temperatures. The isotropically grown high-density single crystals at controlled nucleation-growth rates at 190 °C with 20% CHP show the highest PL intensity and the longest PL lifetimes. This method offers thermodynamic and kinetic control of perovskite single-crystal growth with shape control.
• Slipping-Free Halide Perovskite Supercrystals from Supramolecularly-Assembled Nanocrystals.
  Takuya Okamoto; Vasudevanpillai Biju
  Small (Weinheim an der Bergstrasse, Germany), e2303496, 12 May 2023, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Supramolecularly assembled high-order supercrystals (SCs) help control the dielectric, electronic, and excitonic properties of semiconductor nanocrystals (NCs) and quantum dots (QDs). Ligand-engineered perovskite NCs (PNCs) assemble into SCs showing shorter excitonic lifetimes than strongly dielectric PNC films showing long photoluminescence (PL) lifetimes and long-range carrier diffusion. Monodentate to bidentate ligand exchange on ≈ 8 nm halide perovskite (APbX3 ; A:Cs/MA, X:Br/I) PNCs generates mechanically stable SCs with close-packed lattices, overlapping electronic wave functions, and higher dielectric constant, providing distinct excitonic properties from single PNCs or PNC films. From Fast Fourier Transform (FFT) images, time-resolved PL, and small-angle X-ray scattering, structurally and excitonically ordered large SCs are identified. An Sc shows a smaller spectral shift (<35 meV) than a PNC film (>100 meV), a microcrystal (>100 meV), or a bulk crystal (>100 meV). Also, the exciton lifetime (<10 ns) of an SC is excitation power-independent in the single exciton regime 〈N〉<1, comparable to an isolated PNC. Therefore, bidentate-ligand-assisted SCs help overcome delayed exciton or carrier recombination in halide perovskite nanocrystal assemblies or films.
• Recent progress in the development of high-efficiency inverted perovskite solar cells
  Sanwan Liu; Vasudevan P. Biju; Yabing Qi; Wei Chen; Zonghao Liu
  NPG Asia Materials, 15, 1, Springer Science and Business Media LLC, 05 May 2023, [Peer-reviewed], [Corresponding author]
  Scientific journal, Abstract
  
  Perovskite solar cells (PSCs) have attracted much attention due to their low-cost fabrication and high power conversion efficiency (PCE). However, the long-term stability issues of PSCs remain a significant bottleneck impeding their commercialization. Inverted PSCs with a p-i-n architecture are being actively researched due to their concurrent good stability and decent efficiency. In particular, the PCE of inverted PSCs has improved significantly in recent years and is now almost approaching that of n-i-p PSCs. This review summarizes recent progress in the development of high-efficiency inverted PSCs, including the development of perovskite compositions, fabrication methods, and counter electrode materials (CEMs). Notably, we highlight the development of charge transport materials (CTMs) and the effects of defect passivation strategies on the performance of inverted PSCs. Finally, we discuss the remaining issues and perspectives of high-efficiency inverted PSCs.
• Photoinduced interfacial electron transfer from perovskite quantum dots to molecular acceptors for solar cells.
  Bhagyashree Mahesha Sachith; Zhijing Zhang; Palyam Subramanyam; Challapalli Subrahmanyam; Akihiro Furube; Naoto Tamai; Takuya Okamoto; Hiroaki Misawa; Vasudevanpillai Biju
  Nanoscale, 15, 17, 7695, 7702, 04 May 2023, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Bandgap-engineered inorganic and hybrid halide perovskite (HP) films, nanocrystals, and quantum dots (PQDs) are promising for solar cells. Fluctuations of photoinduced electron transfer (PET) rates affect the interfacial charge separation efficiencies of such solar cells. Electron donor- or acceptor-doped perovskite samples help analyze PET and harvest photogenerated charge carriers efficiently. Therefore, PET in perovskite-based donor-acceptor (D-A) systems has received considerable attention. We analyzed the fluctuations of interfacial PET from MAPbBr3 or CsPbBr3 PQDs to classical electron acceptors such as 7,7,8,8-tetracyanoquinodimethane (TCNQ) and 1,2,4,5-tetracyanobenzene (TCNB) at single-particle and ensemble levels. The significantly negative Gibbs free energy changes of PET estimated from the donor-acceptor redox potentials, the donor-acceptor sizes, and the solvent dielectric properties help us clarify the PET in the above D-A systems. The dynamic nature of PET is apparent from the decrease in photoluminescence (PL) lifetimes and PL photocounts of PQDs with an increase in the acceptor concentrations. Also, the acceptor radical anion spectrum helps us characterize the charge-separated states. Furthermore, the PL blinking time and PET rate fluctuations (108 to 107 s-1) provide us with single-molecule level information about interfacial PET in perovskites.
• Luminescent quantum dots: Synthesis, optical properties, bioimaging and toxicity.
  Jeladhara Sobhanan; Jose V Rival; Abdulaziz Anas; Edakkattuparambil Sidharth Shibu; Yuta Takano; Vasudevanpillai Biju
  Advanced drug delivery reviews, 197, 114830, 114830, 20 Apr. 2023, [Peer-reviewed], [Lead author, Last author, Corresponding author], [International Magazine]
  English, Scientific journal, Luminescent nanomaterials such as semiconductor nanocrystals (NCs) and quantum dots (QDs) attract much attention to optical detectors, LEDs, photovoltaics, displays, biosensing, and bioimaging. These materials include metal chalcogenide QDs and metal halide perovskite NCs. Since the introduction of cadmium chalcogenide QDs to biolabeling and bioimaging, various metal nanoparticles (NPs), atomically precise metal nanoclusters, carbon QDs, graphene QDs, silicon QDs, and other chalcogenide QDs have been infiltrating the nano-bio interface as imaging and therapeutic agents. Nanobioconjugates prepared from luminescent QDs form a new class of imaging probes for cellular and in vivo imaging with single-molecule, super-resolution, and 3D resolutions. Surface modified and bioconjugated core-only and core-shell QDs of metal chalcogenides (MX; M = Cd/Pb/Hg/Ag, and X = S/Se/Te,), binary metal chalcogenides (MInX2; M = Cu/Ag, and X = S/Se/Te), indium compounds (InAs and InP), metal NPs (Ag, Au, and Pt), pure or mixed precision nanoclusters (Ag, Au, Pt), carbon nanomaterials (graphene QDs, graphene nanosheets, carbon NPs, and nanodiamond), silica NPs, silicon QDs, etc. have become prevalent in biosensing, bioimaging, and phototherapy. While heavy metal-based QDs are limited to in vitro bioanalysis or clinical testing due to their potential metal ion-induced toxicity, carbon (nanodiamond and graphene) and silicon QDs, gold and silica nanoparticles, and metal nanoclusters continue their in vivo voyage towards clinical imaging and therapeutic applications. This review summarizes the synthesis, chemical modifications, optical properties, and bioimaging applications of semiconductor QDs with particular references to metal chalcogenide QDs and bimetallic chalcogenide QDs. Also, this review highlights the toxicity and pharmacokinetics of QD bioconjugates.
• Nanomaterials for Fluorescence and Multimodal Bioimaging
  Jeladhara Sobhanan; Abdulaziz Anas; Vasudevanpillai Biju
  The Chemical Record, 23, 3, Wiley, 15 Feb. 2023, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  Scientific journal, Abstract
  
  Bioconjugated nanomaterials replace molecular probes in bioanalysis and bioimaging in vitro and in vivo. Nanoparticles of silica, metals, semiconductors, polymers, and supramolecular systems, conjugated with contrast agents and drugs for image‐guided (MRI, fluorescence, PET, Raman, SPECT, photodynamic, photothermal, and photoacoustic) therapy infiltrate into preclinical and clinical settings. Small bioactive molecules like peptides, proteins, or DNA conjugated to the surfaces of drugs or probes help us to interface them with cells and tissues. Nevertheless, the toxicity and pharmacokinetics of nanodrugs, nanoprobes, and their components become the clinical barriers, underscoring the significance of developing biocompatible next‐generation drugs and contrast agents. This account provides state‐of‐the‐art advancements in the preparation and biological applications of bioconjugated nanomaterials and their molecular, cell, and in vivo applications. It focuses on the preparation, bioimaging, and bioanalytical applications of monomodal and multimodal nanoprobes composed of quantum dots, quantum clusters, iron oxide nanoparticles, and a few rare earth metal ion complexes.
• Halide Perovskite Single Crystals and Nanocrystal Films as Electron Donor-Acceptor Heterojunctions
  M. D. Shahjahan; Takuya Okamoto; Lata Chouhan; Bhagyashree Mahesha Sachith; Narayan Pradhan; Hiroaki Misawa; Vasudevanpillai Biju
  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Dec. 2022, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  English, Scientific journal
• Caging and photo-triggered uncaging of singlet oxygen by excited state engineering of electron donor–acceptor-linked molecular sensors
  Devika Sasikumar; Yuta Takano; Hanjun Zhao; Reiko Kohara; Morihiko Hamada; Yasuhiro Kobori; Vasudevanpillai Biju
  Scientific Reports, 12, 1, Springer Science and Business Media LLC, Dec. 2022, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  English, Scientific journal, Abstract
  
  Singlet oxygen (¹O₂), one of the most sought-after species in oxidative chemical reactions and photodynamic cancer therapy, is activated and neutralized in the atmosphere and living cells. It is essential to see "when" and "where" ¹O₂ is produced and delivered to understand and utilize it. There is an increasing demand for molecular sensor tools to capture, store, and supply ¹O₂, controlled by light and engineered singlet and triplet states, indicating the ¹O₂-capturing-releasing state. Here, we demonstrate the outstanding potential of an aminocoumarin-methylanthracene-based electron donor–acceptor molecule (1). Spectroscopic measurements confirm the formation of an endoperoxide (1-O₂) which is not strongly fluorescent and remarkably different from previously reported ¹O₂ sensor molecules. Moreover, the photoexcitation on the dye in 1-O₂ triggers fluorescence enhancement by the oxidative rearrangement and a competing ¹O₂ release. The unique ability of 1 will pave the way for the spatially and temporally controlled utilization of ¹O₂ in various areas such as chemical reactions and phototherapies.
• Transition Metal-Doped Boron Nitride Atomic Sheets with an Engineered Bandgap and Magnetization
  Sumit Chahal; Tumesh Kumar Sahu; Subhasmita Kar; Soumya J. Ray; Vasudevanpillai Biju; Prashant Kumar
  The Journal of Physical Chemistry C, 126, 49, 21084, 21093, American Chemical Society (ACS), 18 Nov. 2022, [Peer-reviewed], [Corresponding author]
  Scientific journal
• Photoeradication of aquatic pathogens by curcumin for clean and safe drinking water
  Sulfiya K. Moideen; Abdulaziz Anas; Jeladhara Sobhanan; Hanjun Zhao; Vasudevanpillai Biju
  Journal of Photochemistry and Photobiology A: Chemistry, 432, 114104, 114104, Elsevier BV, Nov. 2022, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  English, Scientific journal
• Electroluminescence of Halide Perovskite Single Crystals Showing Stochastically Active Multiple Emitting Centers
  Sankaramangalam Balachandran Bhagyalakshmi; Dong Zhang; Vasudevanpillai Biju
  The Journal of Physical Chemistry C, 126, 42, 17826, 17835, American Chemical Society (ACS), 17 Oct. 2022, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  Scientific journal
• Excitation‐Wavelength‐dependent Functionalities of Temporally‐controlled Sensing and Generation of Singlet Oxygen by a Photoexcited State Engineered Rhodamine 6G‐anthracene Conjugate
  Hanjun Zhao; Yuta Takano; Devika Sasikumar; Yukiko Miyatake; Vasudevanpillai Biju
  Chemistry – A European Journal, 12 Oct. 2022, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  English, Scientific journal
• Inorganic Chain Mediated Excitonic Properties in One-Dimensional Lead Halide Hybrid Perovskites
  Chen Xue; Hengming Huang; Sadafumi Nishihara; Vasudevanpillai Biju; Xiao-ming Ren; Takayoshi Nakamura
  The Journal of Physical Chemistry Letters, 13, 32, 7405, 7412, American Chemical Society (ACS), 18 Aug. 2022, [Peer-reviewed]
  English, Scientific journal
• Multimodal CTC detection using stem cell antigen-specific immunosilica particles and immunofluorescent quantum dots
  Jeladhara Sobhanan; Yuta Takano; Sakiko Sugino; Eri Hirata; Shohei Yamamura; Vasudevanpillai Biju
  NPG ASIA MATERIALS, 14, 1, Jan. 2022, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  English, Scientific journal
• Mechano-optical Modulation of Excitons and Carrier Recombination in Self-Assembled Halide Perovskite Quantum Dots
  Zhijing Zhang; Sushant Ghimire; Takuya Okamoto; Bhagyashree Mahesha Sachith; Jeladhara Sobhanan; Challapalli Subrahmanyam; Vasudevanpillai Biju
  ACS NANO, Jan. 2022, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  English, Scientific journal
• Molecular recognition in the infection, replication, and transmission of COVID-19-causing SARS-CoV-2: an emerging interface of infectious disease, biological chemistry, and nanoscience
  Prem Kumar; Jeladhara Sobhanan; Yuta Takano; Vasudevanpillai Biju
  NPG Asia Materials, 13, 1, Dec. 2021, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  English, Scientific journal
• Advances in photodynamic antimicrobial chemotherapy
  Abdulaziz Anas; Jeladhara Sobhanan; K.M. Sulfiya; C. Jasmin; P.K. Sreelakshmi; Vasudevanpillai Biju
  Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 49, 100452, 100452, Elsevier BV, Dec. 2021, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  Scientific journal
• Emerging Materials for Plasmon-assisted Photoelectrochemical Water Splitting
  Palyam Subramanyam; Bhagatram Meena; Vasudevanpillai Biju; Hiroaki Misawa; Subrahmanyam Challapalli
  Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 100472, 100472, Elsevier BV, Nov. 2021, [Peer-reviewed]
  Scientific journal
• Long-Range Interfacial Charge Carrier Trapping in Halide Perovskite-C60 and Halide Perovskite-TiO2 Donor–Acceptor Films
  Bhagyashree Mahesha Sachith; Takuya Okamoto; Sushant Ghimire; Tomokazu Umeyama; Yuta Takano; Hiroshi Imahori; Vasudevanpillai Biju
  The Journal of Physical Chemistry Letters, 12, 35, 8644, 8651, 09 Sep. 2021, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  English, Scientific journal
• Efficient solar water splitting using a CdS quantum dot decorated TiO2/Ag2Se photoanode
  Bhagatram Meena; Palyam Subramanyam; Duvvuri Suryakala; Vasudevanpillai Biju; Challapalli Subrahmanyam
  International Journal of Hydrogen Energy, Elsevier BV, Aug. 2021, [Peer-reviewed]
  Scientific journal
• State of the Art and Prospects for Halide Perovskite Nanocrystals
  Amrita Dey; Junzhi Ye; Apurba De; Elke Debroye; Seung Kyun Ha; Eva Bladt; Anuraj S. Kshirsagar; Ziyu Wang; Jun Yin; Yue Wang; Li Na Quan; Fei Yan; Mengyu Gao; Xiaoming Li; Javad Shamsi; Tushar Debnath; Muhan Cao; Manuel A. Scheel; Sudhir Kumar; Julian A. Steele; Marina Gerhard; Lata Chouhan; Ke Xu; Xian-gang Wu; Yanxiu Li; Yangning Zhang; Anirban Dutta; Chuang Han; Ilka Vincon; Andrey L. Rogach; Angshuman Nag; Anunay Samanta; Brian A. Korgel; Chih-Jen Shih; Daniel R. Gamelin; Dong Hee Son; Haibo Zeng; Haizheng Zhong; Handong Sun; Hilmi Volkan Demir; Ivan G. Scheblykin; Iván Mora-Seró; Jacek K. Stolarczyk; Jin Z. Zhang; Jochen Feldmann; Johan Hofkens; Joseph M. Luther; Julia Pérez-Prieto; Liang Li; Liberato Manna; Maryna I. Bodnarchuk; Maksym V. Kovalenko; Maarten B. J. Roeffaers; Narayan Pradhan; Omar F. Mohammed; Osman M. Bakr; Peidong Yang; Peter Müller-Buschbaum; Prashant V. Kamat; Qiaoliang Bao; Qiao Zhang; Roman Krahne; Raquel E. Galian; Samuel D. Stranks; Sara Bals; Vasudevanpillai Biju; William A. Tisdale; Yong Yan; Robert L. Z. Hoye; Lakshminarayana Polavarapu
  ACS Nano, 15, 7, 10775, 10981, American Chemical Society (ACS), 27 Jul. 2021, [Peer-reviewed]
  Scientific journal
• Shape‐Dependent Kinetics of Halide Vacancy Filling in Organolead Halide Perovskites
  Takuya Okamoto; Md. Shahjahan; Vasudevanpillai Biju
  Advanced Optical Materials, 2100355, 2100355, 18 Jun. 2021, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  English, Scientific journal
• Real-Time Blinking Suppression of Perovskite Quantum Dots by Halide Vacancy Filling
  Lata Chouhan; Syoji Ito; Elizabeth Mariam Thomas; Yuta Takano; Sushant Ghimire; Hiroshi Miyasaka; Vasudevanpillai Biju
  ACS Nano, 15, 2, 2831, 2838, American Chemical Society (ACS), 23 Feb. 2021, [Peer-reviewed], [Corresponding author]
  English, Scientific journal
• Heterojunction Perovskite Microrods Prepared by Remote‐Controlled Vacancy Filling and Halide Exchange
  Md Shahjahan; Ken‐ichi Yuyama; Takuya Okamoto; Vasudevanpillai Biju
  Advanced Materials Technologies, 6, 2, 2000934, 2000934, Feb. 2021, [Peer-reviewed], [Corresponding author]
  English, Scientific journal
• Photoluminescence investigations of sulfur quantum dots synthesized by a bubbling-assisted strategy
  Shuo Liu; Henggang Wang; Anrui Feng; Jianyu Chang; Chuanchuan Zhang; Yu-e Shi; Yongqing Zhai; Vasudevanpillai Biju; Zhenguang Wang
  Nanoscale Advances, 3, 14, 4271, 4275, Royal Society of Chemistry (RSC), 2021
  Scientific journal,

  The photoluminescence mechanisms of S-dots were revealed by the bubbling-assisted synthesis and spectroscopic study. The emission color of the S-dots depends on the size, and the emission efficiency is affected by the surface sulfur species.

• Correction to Blinking Suppression in Highly Excited CdSe/ZnS Quantum Dots by Electron Transfer under Large Positive Gibbs (Free) Energy Change
  Elizabeth Mariam Thomas; Sushant Ghimire; Reiko Kohara; Ajith Nair Anil; Ken-ichi Yuyama; Yuta Takano; K. George Thomas; Vasudevanpillai Biju
  ACS Nano, 14, 10, 14250, 14250, American Chemical Society (ACS), 18 Sep. 2020
  Scientific journal
• Photoluminescent Ozone Sensor with Enhanced Sensitivity by Using CdSe/ZnS Quantum Dots Modified with Gold and Platinum
  Masanori ANDO; Kosuke INAGAKI; Hideya KAWASAKI; Vasudevanpillai BIJU; Yasushi SHIGERI
  Analytical Sciences, 36, 8, 989, 995, Japan Society for Analytical Chemistry, 10 Aug. 2020, [International Magazine]
  English, Scientific journal, We report photoluminescence-based ozone sensing using composite films composed of gold or platinum and red-emitting CdSe/ZnS core-shell quantum dots. The sensing efficiency of quantum dots is enhanced by the addition of noble metals. The composite films undergo reversible changes in photoluminescence intensity (measured at excitation/emission wavelengths of 365/652 - 659 nm) in the presence of ppm levels of ozone in air at 25°C and at atmospheric pressure. The sensitivity of the composite films does not saturate with ozone in the 0.5 - 200 ppm concentration range. When compared with a quantum dot-only film, the composite films show higher sensitivities to 0.5 ppm ozone of 27% (gold) and 43% (platinum). When compared with a quantum dot-only film, the photoluminescence of the gold- or platinum-palladium alloy-based film recovers faster after the removal of ozone in the surrounding atmosphere. Thus, platinum- or gold-conjugated quantum-dot films form sensor modules for the reversible and highly sensitive detection of ozone under the tested ambient conditions.
• Spatio-temporally-controlled synthesis of lead halide perovskite crystals by laser trapping
  Ken-ichi Yuyama; Islam Md Jahidul; Vasudevanpillai Biju
  Optical Manipulation and Structured Materials Conference 2020, SPIE, 15 Jun. 2020
  International conference proceedings
• 光増感分子rTPAを搭載したミトコンドリア標的型ナノカプセルの構築および担癌モデルマウスを用いた癌光治療戦略の検証
  山田 勇磨; Satrialdi; 高野 勇太; Biju Vasudevanpillai; 原島 秀吉
  日本薬学会年会要旨集, 140年会, 26X, am11, (公社)日本薬学会, Mar. 2020
  Japanese
• Remote tuning of bandgap and emission of lead perovskites by spatially controlled halide exchange reactions
  Md Jahidul Islam; Md Shahjahan; Ken-ichi Yuyama; Vasudevanpillai Biju
  ACS Materials Letters, 2, 4, 403, 408, American Chemical Society (ACS), Feb. 2020, [Peer-reviewed]
  English, Scientific journal
• The Confinement and Migration of Charge-Carriers in Lead Halide Perovskites
  Sushant Ghimire; Lata Chouhan; Vasudevanpillai Biju
  Photosynergetic Responses in Molecules and Molecular Aggregates, 197, 210, Springer Singapore, 2020
  In book
• SPR induced photoluminescne quenching in Quantum MAPbBr3 -QD/TiO2 inteface
  Katta Venkata Seshaiah; Lata Chouhan; Vasudevanpillai Biju; Sai Santhosh Kumar Raavi
  OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF), OSA, 2020
  International conference proceedings
• Synthesis, optoelectronic properties and applications of halide perovskites
  Lata Chouhan; Sushant Ghimire; Challapalli Subrahmanyam; Tsutomu Miyasaka; Vasudevanpillai Biju
  Chemical Society Reviews, 49, 10, 2869, 2885, Royal Society of Chemistry (RSC), 2020, [Peer-reviewed]
  English, Scientific journal,

  Halide perovskites have emerged as a class of most promising and cost-effective semiconductor materials for next generation photoluminescent, electroluminescent and photovoltaic devices.

• Toxicity of nanomaterials due to photochemical degradation and the release of heavy metal ions
  Jeladhara Sobhanan; Philip Jones; Reiko Kohara; Sakiko Sugino; Martin Vacha; Challapally Subrahmanyam; Yuta Takano; Fred Lacy; Vasudevanpillai Biju
  Nanoscale, 12, 43, 22049, 22058, Royal Society of Chemistry (RSC), 2020, [Peer-reviewed]
  English, Scientific journal,

  The cytotoxicity and genotoxicity of PbS quantum dots by photochemical etching and the release of lead ions.

• Near-infrared light control of membrane potential by an electron donor–acceptor linked molecule
  Yuta Takano; Kazuaki Miyake; Jeladhara Sobhanan; Vasudevanpillai Biju; Nikolai V. Tkachenko; Hiroshi Imahori
  Chemical Communications, 56, 83, 12562, 12565, Royal Society of Chemistry (RSC), 2020, [Peer-reviewed]
  English, Scientific journal,

  (π-Extended porphyrin)–fullerene linked molecules are synthesized to utilize the molecular excited states induced by near-infrared light. One of the molecules successfully alters the membrane potential.

• A photoanode with plasmonic nanoparticles of earth abundant bismuth for photoelectrochemical reactions
  Palyam Subramanyam; Melepurath Deepa; Sai Santosh Kumar Raavi; Hiroaki Misawa; Vasudevanpillai Biju; Challapalli Subrahmanyam
  Nanoscale Advances, 2, 12, 5591, 5599, Royal Society of Chemistry (RSC), 2020, [Peer-reviewed], [Corresponding author]
  English, Scientific journal,

  A wide range of technologies has been developed for producing hydrogen economically and in greener ways.

• Extinction of Antimicrobial Resistant Pathogens Using Silver Embedded Silica Nanoparticles and an Efflux Pump Blocker
  Jiya Jose; Abdulaziz Anas; Bina Jose; Anand B. Puthirath; Sujith Athiyanathil; Chekidhenkuzhiyil Jasmin; M. R. Anantharaman; Shanta Nair; Challapalli Subrahmanyam; Vasudevanpillai Biju
  ACS Applied Bio Materials, 2, 11, 4681, 4686, American Chemical Society (ACS), 18 Nov. 2019
  Scientific journal
• Mixed-halide perovskite synthesis by chemical reaction and crystal nucleation under an optical potential
  Md Jahidul Islam; Ken-ichi Yuyama; Kiyonori Takahashi; Takayoshi Nakamura; Katsuaki Konishi; Vasudevanpillai Biju
  NPG Asia Materials, 11, 31, Jun. 2019, [Peer-reviewed]
  English, Scientific journal
• Blinking Beats Bleaching: The Control of Superoxide Generation by Photo‐ionized Perovskite Nanocrystals
  Lata Chouhan; Sushant Ghimire; Vasudevanpillai Biju
  Angewandte Chemie International Edition, 58, 15, 4875, 4879, Wiley, Apr. 2019
  Scientific journal
• Photoinduced Photoluminescence Enhancement in Self-assembled Clusters of Formamidinium Lead Bromide Perovskite Nanocrystals
  Sushant Ghimire; Vijayakumar C Nair; Chinnadurai Muthu; Ken-ichi Yuyama; Martin Vacha; Vasudevanpillai Biju
  Nanoscale, 11, 19, 9335, 9340, Royal Society of Chemistry (RSC), Mar. 2019, [Peer-reviewed]
  English, Scientific journal,

  Delayed recombination of photogenerated charge carriers or excitons is accomplished in self-assemblies of perovskite nanocrystals.

• Phase transfer reaction for the preparation of stable polymer-quantum dot conjugates
  Geethy P Gopalan; Ajith Nair Anil; Sushant Ghimire; Nidhin Joy; Ken-ichi Yuyama; Vasudevanpillai Biju; Raju Francis
  Journal of Photochemistry and Photobiology A: Chemistry, 371, 91, 97, Elsevier BV, Feb. 2019, [Peer-reviewed]
  English, Scientific journal
• The optimization of cancer photodynamic therapy by utilization of a pi-extended porphyrin-type photosensitizer in combination with MITO-Porter
  Satrialdi; Reina Munechika; Vasudevanpillai Biju; Yuta Takano; Hideyoshi Harashima; Yuma Yamada
  Chemical Communications, 2019, [Peer-reviewed]
  English, Scientific journal
• Photoinduced Betaine Generation for the Efficient Photothermal Energy Conversion
  Devika Sasikumar; Yuta Takano; Vasudevanpillai Biju
  Chemistry A European Journal, 2019, [Peer-reviewed]
  English, Scientific journal
• Nonradiative Energy Transfer through Distributed Bands in Piezochemically-synthesized Cesium and Formamidinium Lead Halide Perovskites
  Sankaramangalam Balachandran Bhagyalakshmi; Sushant Ghimire; Kiyonari Takahashi; Ken-ichi Yuyama; Yuta Takano; Takayoshi Nakamura; Vasudevan Biju
  Chemistry A European Journal, 26, 10, 2133, 2137, Wiley, 2019, [Peer-reviewed]
  English, Scientific journal
• Photon-recycling by Energy Transfer in Piezochemically Synthesized and Close-packed Methyl Ammonium Lead Halide Perovskites
  Sushant Ghimire; Kiyonori Takahashi; Yuta Takano; Takayoshi Nakamura; Vasudevanpillai Biju
  Journal of Physical Chemistry C, 123, 45, 27752, 27758, 2019, [Peer-reviewed]
  English, Scientific journal
• Kinetics of singlet oxygen sensing using 9-substituted anthracene derivatives #
  Devika Sasikumar; Reiko Kohara; Yuta Takano; Ken-ichi Yuyama; Vasudevanpillai Biju
  Journal of Chemical Sciences, 131, 1, 5, 5, Springer Science and Business Media LLC, Jan. 2019, [Peer-reviewed]
  English, Scientific journal
• Stark Effect and Environment Induced Modulation of Emission in Single Halide Perovskite Nanocrystals
  Dharmendar Kumar Sharma; Shuzo Hirata; Vasudevanpillai Biju; Martin Vacha
  ACS nano, 13, 1, 624, 632, Jan. 2019, [Peer-reviewed]
  English, Scientific journal
• Amplified and Multicolor Emission from Films and Interfacial Layers of Lead Halide Perovskite Nanocrystals
  Sushant Ghimire; Lata Chouhan; Yuta Takano; Kiyonori Takahashi; Takayoshi Nakamura; Vasudevan Pillai Biju; Kenichi Yuyama
  ACS Energy Letters, Nov. 2018, [Peer-reviewed]
  English, Scientific journal
• Excitons and Biexciton Dynamics in Single CsPbBr3 Perovskite Quantum Dots
  Bin Li,He Huang; Guofeng Zhang; Changgang Yang; Wenli Guo; Ruiyun Chen; Qin Chengbing; Yan Gao; Vasudevan Pillai Biju; Andrey L Rogach; Liantuan Xiao; Suotang Jia
  The journal of physical chemistry letters, 9, 6934, 6940, Nov. 2018, [Peer-reviewed]
  English, Scientific journal
• Crystallization of Methylammonium Lead Halide Perovskites by Optical Trapping
  Vasudevan BIJU; Ken-ichi Yuyama; Md Jahidul Islam; Kiyonori Takahashi; Takayoshi Nakamura
  Angewandte Chemie, Aug. 2018, [Peer-reviewed]
  English, Scientific journal
• Blinking Suppression in Highly-Excited CdSe/ZnS Quantum Dots by Electron Transfer under Large Positive Gibbs (Free) Energy Change
  Elizabeth Mariam Thomas; Sushant Ghimire; Reiko Kohara; Ajith Nair Anil; Ken-ichi Yuyama; Yuta Takano; K George Thomas; Vasudevan Pillai Biju
  ACS nano, 12, 9, 9060, 9069, American Chemical Society (ACS), Aug. 2018, [Peer-reviewed]
  English, Scientific journal
• Quantum dot–polymer conjugates for stable luminescent displays
  S Ghimire; A Sivadas; K Yuyama; Y Takano; R Francis; V Biju
  Nanoscale, 10, 28, 13368, 13374, Royal Society of Chemistry (RSC), Apr. 2018, [Peer-reviewed]
  English, Scientific journal,

  The broad absorption of light in the UV-Vis-NIR region and the size-based tunable photoluminescence color of semiconductor quantum dots make these tiny crystals one of the most attractive antennae in solar cells and phosphors in electrooptical devices.

• Relations of exciton dynamics in quantum dots to photoluminescence, lasing, and energy harvesting
  Sushant Ghimire; Vasudevanpillai Biju
  Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 34, 137, 151, Elsevier B.V., 01 Mar. 2018, [Peer-reviewed]
  English, Scientific journal
• Preface for special issue on photosynergetics
  Vasudevanpillai Biju; Tadashi Mori; Tsuyoshi Asahi; Hiroshi Miyasaka
  Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 34, 1, Mar. 2018, [Peer-reviewed]
• Quantum Dot-Peptide Nanoassembly on Mesoporous Silica Nanoparticle for Biosensing
  Sreenadh Sasidharan Pillai; Hiroshi Yukawa; Daisuke Onoshima; Vasudevanpillai Biju; Yoshinobu Baba
  Nano Hybrids and Composites, 19, 55, 72, Feb. 2018, [Peer-reviewed]
  English, Scientific journal
• Development of technologies for sensing ozone in ambient air
  Masanori Ando; Vasudevanpillai Biju; Yasushi Shigeri
  Analytical Sciences, 34, 3, 263, 271, 2018, [Peer-reviewed]
  English, Scientific journal
• OS1.3 - Optical Ozone Sensing by Composite Films of Noble Metals and CdSe/ZnS Quantum Dots
  M. Ando; V. Biju; H. Kawasaki; Y. Shigeri
  Proceedings IMCS 2018, AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2018
  International conference proceedings
• Optical control of mitochondrial reductive reactions in living cells using an electron donor-acceptor linked molecule
  Yuta Takano; Reina Munechika; Vasudevanpillai Biju; Hideyoshi Harashima; Hiroshi Imahori; Yuma Yamada
  NANOSCALE, 9, 47, 18690, 18698, Dec. 2017, [Peer-reviewed]
  English, Scientific journal
• Optical control of mitochondrial reductive reactions in living cells using an electron donor-acceptor linked molecule
  Yuta Takano; Reina Munechika; Vasudevanpillai Biju; Hideyoshi Harashima; Hiroshi Imahori; Yuma Yamada
  NANOSCALE, 9, 47, 18690, 18698, Dec. 2017, [Peer-reviewed]
  English, Scientific journal
• Blue-Emitting Electron-Donor/Acceptor Dyads for Naked-Eye Fluorescence Detection of Singlet Oxygen
  Kohara Reiko; Yuyama Ken-ichi; Shigeri Yasushi; Biju Vasudevanpillai
  CHEMPHOTOCHEM, 1, 7, 298, 298, Jul. 2017, [Peer-reviewed]
  English
• Reversible photoluminescence sensing of gaseous alkylamines using CdSe-based quantum dots
  Masanori Ando; Takuya Kamimura; Koichi Uegaki; Vasudevanpillai Biju; Jennifer T. Damasco Ty; Yasushi Shigeri
  SENSORS AND ACTUATORS B-CHEMICAL, 246, 1074, 1079, Jul. 2017, [Peer-reviewed]
  English, Scientific journal
• Blue‐Emitting Electron‐Donor/Acceptor Dyads for Naked‐Eye Fluorescence Detection of Singlet Oxygen
  Reiko Kohara; Ken‐ichi Yuyama; Yasushi Shigeri; Vasudevanpillai Biju
  ChemPhotoChem, 1, 7, 299, 303, Jul. 2017, [Peer-reviewed]
  English, Scientific journal
• Influence of Zn on the photoluminescence of colloidal (AgIn)(x)Zn2(1-x) S-2 nanocrystals
  Dharmendar Kumar Sharma; Shuzo Hirata; Lukasz Bujak; Vasudevanpillai Biju; Tatsuya Kameyama; Marino Kishi; Tsukasa Torimoto; Martin Vacha
  PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 19, 5, 3963, 3969, Feb. 2017, [Peer-reviewed]
  English, Scientific journal
• Forster Resonance Energy Transfer Mediated Photoluminescence Quenching in Stoichiometrically Assembled CdSe/ZnS Quantum Dot-Peptide Labeled Black Hole Quencher Conjugates for Matrix Metalloproteinase-2 Sensing
  Sreenadh Sasidharan Pillavi; Hiroshi Yukawa; Daisuke Onoshima; Vasudevanpillai Biju; Yoshinobu Baba
  ANALYTICAL SCIENCES, 33, 2, 137, 142, Feb. 2017, [Peer-reviewed]
  English, Scientific journal
• Influence of Zn on the photoluminescence of colloidal (AgIn)(x)Zn2(1-x) S-2 nanocrystals
  Dharmendar Kumar Sharma; Shuzo Hirata; Lukasz Bujak; Vasudevanpillai Biju; Tatsuya Kameyama; Marino Kishi; Tsukasa Torimoto; Martin Vacha
  PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 19, 5, 3963, 3969, Feb. 2017, [Peer-reviewed]
  English, Scientific journal
• In vivo ROS production and use of oxidative stress-derived biomarkers to detect the onset of diseases such as Alzheimer's disease, Parkinson's disease, and diabetes
  Aya Umeno; Vasudevanpillai Biju; Yasukazu Yoshida
  FREE RADICAL RESEARCH, 51, 4, 413, 427, 2017, [Peer-reviewed]
  English, Scientific journal
• Channeling Exciton Migration into Electron Transfer in Formamidinium Lead Bromide Perovskite Nanocrystal/Fullerene Composites
  Vijayakumar C. Nair; Chinnadurai Muthu; Andrey L. Rogach; Reiko Kohara; Vasudevanpillai Biju
  Angewandte Chemie, 129, 5, 1234, 1238, Wiley, 30 Dec. 2016, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  Scientific journal, Abstract
  
  Hydrophobically capped nanocrystals of formamidinium lead bromide (FAPbBr₃) perovskite (PNC) show bright and stable fluorescence in solution and thin‐film states. When compared with isolated PNCs in a solution, close‐packed PNCs in a thin film show extended fluorescence lifetime (ca. 4.2 μs), which is due to hopping or migration of photogenerated excitons among PNCs. Both fluorescence quantum efficiency and lifetime decrease in a PNC thin film doped with fullerene (C₆₀), which is attributed to channeling of exciton migration into electron transfer to C₆₀. On the other hand, quenching of fluorescence intensity of a PNC solution is not accompanied by any change in fluorescence lifetime, indicating static electron transfer to C₆₀ adsorbed onto the hydrophobic surface of individual PNCs. Exciton migration among close‐packed PNCs and electron transfer to C₆₀ places C₆₀‐doped PNC thin films among cost‐effective antenna systems for solar cells.
• Sensing of ozone based on its quenching effect on the photoluminescence of CdSe-based core-shell quantum dots
  Masanori Ando; Takuya Kamimura; Koichi Uegaki; Vasudevanpillai Biju; Yasushi Shigeri
  MICROCHIMICA ACTA, 183, 11, 3019, 3024, Nov. 2016, [Peer-reviewed]
  English, Scientific journal
• Latest impact factor
  Martin Vacha; Jong-Hyun Ahn; Vasudevan Pillai Biju; Tomoyasu Taniyama; Ikuyoshi Tomita; Shutao Wang; Jihui Yang
  NPG ASIA MATERIALS, 8, Jul. 2016, [Peer-reviewed]
  English
• Intracellular accumulation of indium ions released from nanoparticles induces oxidative stress, proinflammatory response and DNA damage
  Yosuke Tabei; Akinari Sonoda; Yoshihiro Nakajima; Vasudevanpillai Biju; Yoji Makita; Yasukazu Yoshida; Masanori Horie
  JOURNAL OF BIOCHEMISTRY, 159, 2, 225, 237, Feb. 2016, [Peer-reviewed]
  English, Scientific journal
• Fluorescence detection of the pathogenic bacteria Vibrio harveyi in solution and animal cells using semiconductor quantum dots
  Esha Arshad; Abdulaziz Anas; Aparna Asok; C. Jasmin; Somnath S. Pai; I. S. Bright Singh; A. Mohandas; Vasudevanpillai Biju
  RSC ADVANCES, 6, 19, 15686, 15693, 2016, [Peer-reviewed]
  English, Scientific journal
• Single-particle spectroscopy of I-III-VI semiconductor nanocrystals: spectral diffusion and suppression of blinking by two-color excitation
  Dharmendar Kumar Sharma; Shuzo Hirata; Lukasz Bujak; Vasudevanpillai Biju; Tatsuya Kameyama; Marino Kishi; Tsukasa Torimoto; Martin Vacha
  NANOSCALE, 8, 28, 13687, 13694, 2016, [Peer-reviewed]
  English, Scientific journal
• Fluorescence Quenching of CdSe/ZnS Quantum Dots by Using Black Hole Quencher Molecules Intermediated With Peptide for Biosensing Application.
  Sreenadh Sasidharan Pillai; Hiroshi Yukawa; Daisuke Onoshima; Vasudevanpillai Biju; Yoshinobu Baba
  Cell medicine, 8, 1-2, 57, 62, 17 Dec. 2015, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• Fluctuating single sp(2) carbon clusters at single hotspots of silver nanoparticle dimers investigated by surface-enhanced resonance Raman scattering
  Tamitake Itoh; Yuko S. Yamamoto; Vasudevanpillai Biju; Hiroharu Tamaru; Shin-ichi Wakida
  AIP ADVANCES, 5, 12, Dec. 2015, [Peer-reviewed]
  English, Scientific journal
• Auger Ionization Beats Photo-Oxidation of Semiconductor Quantum Dots: Extended Stability of Single-Molecule Photoluminescence
  Shin-ichi Yamashita; Morihiko Hamada; Shunsuke Nakanishi; Hironobu Saito; Yoshio Nosaka; Shin-ichi Wakida; Vasudevanpillai Biju
  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 54, 13, 3892, 3896, Mar. 2015, [Peer-reviewed]
  English, Scientific journal
• In vitro evaluation of the cellular effect of indium tin oxide nanoparticles using the human lung adenocarcinoma A549 cells
  Yosuke Tabei; Akinari Sonoda; Yoshihiro Nakajima; Vasudevanpillai Biju; Yoji Makita; Yasukazu Yoshida; Masanori Horie
  METALLOMICS, 7, 5, 816, 827, 2015, [Peer-reviewed]
  English, Scientific journal
• Nanoparticles speckled by ready-to-conjugate lanthanide complexes for multimodal imaging
  Vasudevanpillai Biju; Morihiko Hamada; Kenji Ono; Sakiko Sugino; Takashi Ohnishi; Edakkattuparambil Sidharth Shibu; Shohei Yamamura; Makoto Sawada; Shunsuke Nakanishi; Yasushi Shigeri; Shin-ichi Wakida
  NANOSCALE, 7, 36, 14829, 14837, 2015, [Peer-reviewed]
  English, Scientific journal
• Single-molecular surface-enhanced resonance Raman scattering as a quantitative probe of local electromagnetic field: The case of strong coupling between plasmonic and excitonic resonance
  Tamitake Itoh; Yuko S. Yamamoto; Hiroharu Tamaru; Vasudevanpillai Biju; Shin-ichi Wakida; Yukihiro Ozaki
  PHYSICAL REVIEW B, 89, 19, May 2014, [Peer-reviewed]
  English, Scientific journal
• Photoluminescence of CdSe and CdSe/ZnS quantum dots: Modifications for making the invisible visible at ensemble and single-molecule levels
  Edakkattuparambil S. Shibu; Morihiko Hamada; Shunsuke Nakanishi; Shin-ichi Wakida; Vasudevanpillai Biju
  COORDINATION CHEMISTRY REVIEWS, 263, 2, 12, Mar. 2014, [Peer-reviewed]
  English
• In Situ Photochemical Surface Passivation of CdSe/ZnS Quantum Dots for Quantitative Light Emission and Enhanced Photocurrent Response in Solar Cells
  Morihiko Hamada; Norifumi Takenokoshi; Keiji Matozaki; Qi Feng; Norio Murase; Shin-ichi Wakida; Shunsuke Nakanishi; Vasudevanpillai Biju
  JOURNAL OF PHYSICAL CHEMISTRY C, 118, 4, 2178, 2186, Jan. 2014, [Peer-reviewed]
  English, Scientific journal
• SERS microscopic imaging as novel tool for assessing viability and enumerating yeast cells at various stages of cell cycle in lag, log, exponential and stationary phases of growth in culture
  Manikantan Syamala Kiran; Tamitake Itoh; Hiroko Abe; Yasuko Fujita; Kazuya Tomimoto; Vasudevanpillai Biju; Sajani Kavitha; Arumugham Ganamani; Mitsuru Ishikawa
  JOURNAL OF EXPERIMENTAL NANOSCIENCE, 9, 10, 1003, 1014, 2014, [Peer-reviewed]
  English, Scientific journal
• Chemical modifications and bioconjugate reactions of nanomaterials for sensing, imaging, drug delivery and therapy
  Vasudevanpillai Biju
  CHEMICAL SOCIETY REVIEWS, 43, 3, 744, 764, 2014, [Peer-reviewed]
  English
• Photouncaging Nanoparticles for MRI and Fluorescence Imaging in Vitro and in Vivo
  Edakkattuparambil S. Shibu; Kenji Ono; Sakiko Sugino; Ayami Nishioka; Akikazu Yasuda; Yasushi Shigeri; Shin-ichi Wakida; Makoto Sawada; Vasudevanpillai Biju
  ACS NANO, 7, 11, 9851, 9859, Nov. 2013, [Peer-reviewed]
  English, Scientific journal
• Singlet-Oxygen-Sensitizing Near-Infrared-Fluorescent Multimodal Nanoparticles
  Edakkattuparambil Sidharth Shibu; Sakiko Sugino; Kenji Ono; Hironobu Saito; Ayama Nishioka; Shohei Yamamura; Makoto Sawada; Yoshio Nosaka; Vasudevanpillai Biju
  ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 52, 40, 10559, 10563, Sep. 2013, [Peer-reviewed]
  English, Scientific journal
• Single Quantum Dot Tracking Reveals that an Individual Multivalent HIV-1 Tat Protein Transduction Domain Can Activate Machinery for Lateral Transport and Endocytosis
  Yasuhiro Suzuki; Chandra Nath Roy; Warunya Promjunyakul; Hiroyasu Hatakeyama; Kohsuke Gonda; Junji Imamura; Biju Vasudevanpillai; Noriaki Ohuchi; Makoto Kanzaki; Hideo Higuchi; Mitsuo Kaku
  MOLECULAR AND CELLULAR BIOLOGY, 33, 15, 3036, 3049, Aug. 2013, [Peer-reviewed]
  English, Scientific journal
• Effects of Interactions with Cyclic Solvent Molecules on Optical Dephasing of CdSe/ZnS Colloidal Quantum Dots Detected by Femtosecond Four-Wave Mixing Spectroscopy
  Yusuke Hirosawa; Hiroyoshi Kouzai; Naoya Yamazaki; Hayato Miyagawa; Noriaki Tsurumachi; Shun Koshiba; Shunsuke Nakanishi; VasudevanPillai Biju; Mituru Ishikawa
  JAPANESE JOURNAL OF APPLIED PHYSICS, 52, 7, Jul. 2013, [Peer-reviewed]
  English, Scientific journal
• Excitation laser energy dependence of surface-enhanced fluorescence showing plasmon-induced ultrafast electronic dynamics in dye molecules
  Tamitake Itoh; Yuko S. Yamamoto; Hiroharu Tamaru; Vasudevanpillai Biju; Norio Murase; Yukihiro Ozaki
  PHYSICAL REVIEW B, 87, 23, Jun. 2013, [Peer-reviewed]
  English, Scientific journal
• Nanomaterials formulations for photothermal and photodynamic therapy of cancer
  Edakkattuparambil Sidharth Shibu; Morihiko Hamada; Norio Murase; Vasudevanpillai Biju
  JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS, 15, 53, 72, Jun. 2013, [Peer-reviewed]
  English
• Dynamic Interactions of CdSe/Zns Quantum Dots with Cyclic Solvents Probed by Femtosecond Four-Wave Mixing
  Y. Hirosawa; H. Kouzai; H. Miyagawa; N. Tsurumachi; S. Koshiba; S. Nakanishi; V. Biju; M. Ishikawa
  XVIIITH INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA, 41, 04036, 04036, 2013, [Peer-reviewed]
  English, International conference proceedings
• Impairments of cells and genomic DNA by environmentally transformed engineered nanomaterials
  Philip Jones; Sakiko Sugino; Shohei Yamamura; Fred Lacy; Vasudevanpillai Biju
  Nanoscale, 5, 20, 9511, 9511, Royal Society of Chemistry (RSC), 2013, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  Scientific journal
• Energy materials: supramolecular nanoparticles for solar energy harvesting
  E. S. Shibu; A. Sonoda; Z. Tao; Q. Feng; A. Furube; S. Masuo; L. Wang; N. Tamai; M. Ishikawa; V. Biju
  Nano Reviews, 4, 1, 21079, 21079, Informa UK Limited, Jan. 2013, [Peer-reviewed], [Lead author, Last author, Corresponding author]
  Scientific journal
• Inhibition Assay of Yeast Cell Walls by Plasmon Resonance Rayleigh Scattering and Surface-Enhanced Raman Scattering Imaging
  Kiran Manikantan Syamala; Hiroko Abe; Yasuko Fujita; Kazuya Tomimoto; Vasudevanpillai Biju; Mitsuru Ishikawa; Yukihiro Ozaki; Tamitake Itoh
  LANGMUIR, 28, 24, 8952, 8958, Jun. 2012, [Peer-reviewed]
  English, Scientific journal
• FRET from Quantum Dots to Photodecompose Undesired Acceptors and Report the Condensation and Decondensation of Plasmid DNA
  Vasudevanpillai Biju; Abdulaziz Anas; Hidetaka Akita; Edakkattuparambil Sidharthan Shibu; Tamitake Itoh; Hideyoshi Harashima; Mitsuru Ishikawa
  ACS NANO, 6, 5, 3776, 3788, May 2012, [Peer-reviewed]
  English, Scientific journal
• Photofabrication of Fullerene-Shelled Quantum Dots Supramolecular Nanoparticles for Solar Energy Harvesting
  Edakkattuparambil Sidharth Shibu; Akinari Sonoda; Zhuoqiz Tao; Qi Feng; Akihiro Furube; Sadahiro Masuo; Li Wang; Naoto Tamai; Mitsuru Ishikawa; Vasudevanpillai Biju
  ACS NANO, 6, 2, 1601, 1608, Feb. 2012, [Peer-reviewed]
  English, Scientific journal
• Quantitative evaluation of blinking in surface enhanced resonance Raman scattering and fluorescence by electromagnetic mechanism
  Tamitake Itoh; Mitsuhiro Iga; Hiroharu Tamaru; Ken-ichi Yoshida; Vasudevanpillai Biju; Mitsuru Ishikawa
  JOURNAL OF CHEMICAL PHYSICS, 136, 2, Jan. 2012, [Peer-reviewed]
  English, Scientific journal
• Quantitative analysis of condensation/decondensation status of pDNA in the nuclear sub-domains by QD-FRET
  Sharif M. Shaheen; Hidetaka Akita; Atsushi Yamashita; Ryo Katoono; Nobuhiko Yui; Vasudevanpillai Biju; Mitsuru Ishikawa; Hideyoshi Harashima
  NUCLEIC ACIDS RESEARCH, 39, 7, E48, U108, Apr. 2011, [Peer-reviewed]
  English, Scientific journal
• Experimental demonstration of the electromagnetic mechanism underlying surface enhanced Raman scattering using single nanoparticle spectroscopy
  Tamitake Itoh; Ken-ichi Yoshida; Hiroharu Tamaru; Vasudevanpillai Biju; Mitsuru Ishikawa
  JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 219, 2-3, 167, 179, Apr. 2011, [Peer-reviewed]
  English, Scientific journal
• Quantitative analysis of condensation/decondensation status of pDNA in the nuclear sub-domains by QD-FRET.
  Sharif M Shaheen; Hidetaka Akita; Atsushi Yamashita; Ryo Katoono; Nobuhiko Yui; Vasudevanpillai Biju; Mitsuru Ishikawa; Hideyoshi Harashima
  Nucleic Acids Res., 39, 7, e48, e48, Apr. 2011, [Peer-reviewed]
  English, Scientific journal, Recent studies indicate that controlling the nuclear decondensation and intra-nuclear localization of plasmid DNA (pDNA) would result in an increased transfection efficiency. In the present study, we established a technology for imaging the nuclear condensation/decondensation status of pDNA in nuclear subdomains using fluorescence resonance energy transfer (FRET) between quantum dot (QD)-labeled pDNA as donor, and rhodamine-labeled polycations as acceptor. The FRET-occurring pDNA/polycation particle was encapsulated in a nuclear delivery system; a tetra-lamellar multifunctional envelope-type nano device (T-MEND), designed to overcome the endosomal membrane and nuclear membrane via step-wise fusion. Nuclear subdomains (i.e. heterochromatin and euchromatin) were distinguished by Hoechst33342 staining. Thereafter, Z-series of confocal images were captured by confocal laser scanning microscopy. pDNA in condensation/decondensation status in heterochromatin or euchromatin were quantified based on the pixel area of the signals derived from the QD and rhodamine. The results obtained indicate that modulation of the supra-molecular structure of polyrotaxane (DMAE-ss-PRX), a condenser that is
• Bioconjugated quantum dots for cancer research: Present status, prospects and remaining issues (vol 28, pg 199, 2010)
  Vasudevanpillai Biju; Sathish Mundayoor; Ramakrishnapillai V. Omkumar; Abdulaziz Anas; Mitsuru Ishikawa
  BIOTECHNOLOGY ADVANCES, 29, 2, 259, 260, Mar. 2011, [Peer-reviewed]
  English
• Quantitative evaluation of electromagnetic enhancement in surface-enhanced resonance Raman scattering from plasmonic properties and morphologies of individual Ag nanostructures (vol 81, 115406, 2010)
  Ken-ichi Yoshida; Tamitake Itoh; Hiroharu Tamaru; Vasudevanpillai Biju; Mitsuru Ishikawa; Yukihiro Ozaki
  PHYSICAL REVIEW B, 83, 11, Mar. 2011, [Peer-reviewed]
  English
• Luminescent Quantum Dots, Making Invisibles Visible in Bioimaging
  Mitsuru Ishikawa; Vasudevanpillai Biju
  NANOPARTICLES IN TRANSLATIONAL SCIENCE AND MEDICINE, 104, 53, 99, 2011, [Peer-reviewed]
  English, In book
• Single-molecule photochemical reactions of Auger-ionized quantum dots.
  Hamada M; Shibu ES; Itoh T; Kiran MS; Nakanishi S; Ishikawa M; Biju V
  Nano reviews, 2, 2011, [Peer-reviewed], [International Magazine]
  English, Scientific journal, Photoinduced electron transfer in donor-acceptor systems composed of quantum dots (QDs) and electron donors or acceptors is a subject of considerable recent research interest due to the potential applications of such systems in both solar energy harvesting and degradation of organic pollutants. Herein, we employed single-molecule imaging and spectroscopy techniques for the detection of photochemical reactions between 1,4-diaminobutane (DAB) and CdSe/ZnS single QDs. We investigated the reactions by analyzing photoluminescence (PL) intensity and lifetime of QDs at ensemble and single-molecule levels. While DAB was applied to single QDs tethered on a cover slip or QDs dispersed in a solution, PL intensity of QD continuously decreased with a concomitant increase in the PL lifetime. Interestingly, these changes in the PL properties of QD were predominant under high-intensity photoactivation. We hypothesize that the above changes in the PL properties surface due to the transfer of an electron from DAB to Auger-ionized QD followed by elimination of a proton from DAB and the formation of a QD-DAB adduct. Thus, a continuous decrease in the PL intensity of QDs under high-intensity photoactivation is attributed to continuous photochemical reactions of DAB with single QDs and the formation of QD-(DAB)(n) adducts. We believe that detection and analysis of such photochemical reactions of single QDs with amines will be of considerable broad interest due to the significant impact of photoinduced electron transfer reactions in energy management and environmental remediation.
• Spectral variations in background light emission of surface-enhanced resonance hyper Raman scattering coupled with plasma resonance of individual silver nanoaggregates (vol 133, 124704, 2010)
  Tamitake Itoh; Hiroyuki Yoshikawa; Ken-ichi Yoshida; Vasudevanpillai Biju; Mitsuru Ishikawa
  JOURNAL OF CHEMICAL PHYSICS, 133, 14, Oct. 2010, [Peer-reviewed]
  English
• Spectral variations in background light emission of surface-enhanced resonance hyper Raman scattering coupled with plasma resonance of individual silver nanoaggregates
  Tamitake Itoh; Hiroyuki Yoshikawa; Ken-ichi Yoshida; Vasudevanpillai Biju; Mitsuru Ishikawa
  JOURNAL OF CHEMICAL PHYSICS, 133, 12, Sep. 2010, [Peer-reviewed]
  English, Scientific journal
• Blinking Suppression in CdSe/ZnS Single Quantum Dots by TiO2 Nanoparticles
  Morihiko Hamada; Shunsuke Nakanishi; Tamitake Itoh; Mitsuru Ishikawa; Vasudevanpillai Biju
  ACS NANO, 4, 8, 4445, 4454, Aug. 2010, [Peer-reviewed]
  English, Scientific journal
• Bioconjugated quantum dots for cancer research: Present status, prospects and remaining issues
  Vasudevanpillai Biju; Sathish Mundayoor; Ramakrishnapillai V. Omkumar; Abdulaziz Anas; Mitsuru Ishikawa
  BIOTECHNOLOGY ADVANCES, 28, 2, 199, 213, Mar. 2010, [Peer-reviewed]
  English
• Quantitative evaluation of electromagnetic enhancement in surface-enhanced resonance Raman scattering from plasmonic properties and morphologies of individual Ag nanostructures
  Ken-ichi Yoshida; Tamitake Itoh; Hiroharu Tamaru; Vasudevanpillai Biju; Mitsuru Ishikawa; Yukihiro Ozaki
  PHYSICAL REVIEW B, 81, 11, Mar. 2010, [Peer-reviewed]
  English, Scientific journal
• Modulatory role of versons glands peptide in insect metamorphosis
  Muraleedharan Damodaran; Gayathri E. Uma; R. V. Omkumar; Vasudevanpillai Biju; Govindan Bhaskaran
  ENDOCRINE JOURNAL, 57, S612, S612, Mar. 2010, [Peer-reviewed]
  English
• Selective Detection of HbA1c Using Surface Enhanced Resonance Raman Spectroscopy
  Manikantan Syamala Kiran; Tamitake Itoh; Ken-ichi Yoshida; Nagako Kawashima; Vasudevanpillai Biju; Mitsuru Ishikawa
  ANALYTICAL CHEMISTRY, 82, 4, 1342, 1348, Feb. 2010, [Peer-reviewed]
  English, Scientific journal
• Single-Molecule FRET Imaging for Enzymatic Reactions at High Ligand Concentrations
  Mitsuhiro Sugawa; So Nishikawa; Atsuko Hikikoshi Iwane; Vasudevanpillai Biju; Toshio Yanagida
  SMALL, 6, 3, 346, 350, Feb. 2010, [Peer-reviewed]
  English, Scientific journal
• Reversible Dimerization of EGFR Revealed by Single-Molecule Fluorescence Imaging Using Quantum Dots
  Nagako Kawashima; Kenichi Nakayama; Kohji Itoh; Tamitake Itoh; Mitsuru Ishikawa; Vasudevanpillai Biju
  CHEMISTRY-A EUROPEAN JOURNAL, 16, 4, 1186, 1192, 2010, [Peer-reviewed]
  English, Scientific journal
• Delivering quantum dots to cells: bioconjugated quantum dots for targeted and nonspecific extracellular and intracellular imaging
  Vasudevanpillai Biju; Tamitake Itoh; Mitsuru Ishikawa
  CHEMICAL SOCIETY REVIEWS, 39, 8, 3031, 3056, 2010, [Peer-reviewed]
  English
• In vitro imaging of cells using peptide-conjugated quantum dots
  Mitsuru Ishikawa; Vasudevanpillai Biju
  COLLOIDAL QUANTUM DOTS FOR BIOMEDICAL APPLICATIONS V, 7575, 2010, [Peer-reviewed]
  English, International conference proceedings
• In vitro imaging of cells using peptide-conjugated quantum dots
  Mitsuru Ishikawa; Vasudevan Biju
  Progress in Biomedical Optics and Imaging - Proceedings of SPIE, 7575, 2010, [Peer-reviewed]
  English, International conference proceedings
• Spectral shapes of surface-enhanced resonance Raman scattering sensitive to the refractive index of media around single Ag nanoaggregates
  Ken-ichi Yoshida; Tamitake Itoh; Vasudevanpillai Biju; Mitsuru Ishikawa; Yukihiro Ozaki
  APPLIED PHYSICS LETTERS, 95, 26, Dec. 2009, [Peer-reviewed]
  English, Scientific journal
• Photoluminescence of CdSe Quantum Dots: Shifting, Enhancement and Blinking
  Vasudevanpillai Biju; Mitsuru Ishikawa
  Molecular Nano Dynamics: Vol. I: Spectroscopic Methods and Nanostructures / Vol. II: Active Surfaces, Single Crystals and Single Biocells, 1, 293, 314, John Wiley and Sons, 27 Nov. 2009, [Peer-reviewed]
  English, In book
• Imaging the cell wall of living single yeast cells using surface-enhanced Raman spectroscopy
  Athiyanathil Sujith; Tamitake Itoh; Hiroko Abe; Ken-ichi Yoshida; Manikantan S. Kiran; Vasudevanpillai Biju; Misturu Ishikawa
  ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 394, 7, 1803, 1809, Aug. 2009, [Peer-reviewed]
  English, Scientific journal
• Spontaneous Adsorption on a Hydrophobic Surface Governed by Hydrogen Bonding
  Fuquan Dang; Takeshi Hasegawa; Vasudevanpillai Biju; Mitsuru Ishikawa; Noritada Kaji; Takao Yasui; Yoshinobu Baba
  LANGMUIR, 25, 16, 9296, 9301, Aug. 2009, [Peer-reviewed]
  English, Scientific journal
• Clathrin-Mediated Endocytosis of Quantum Dot-Peptide Conjugates in Living Cells
  Abdulaziz Anas; Tetsuya Okuda; Nagako Kawashima; Kenichi Nakayama; Tamitake Itoh; Mitsuru Ishikawa; Vasudevanpillai Biju
  ACS NANO, 3, 8, 2419, 2429, Aug. 2009, [Peer-reviewed]
  English, Scientific journal
• Surface Plasmon Excitation and Surface-Enhanced Raman Scattering Using Two-Dimensionally Close-Packed Gold Nanoparticles
  Mohammad Kamal Hossain; Yasutaka Kitahama; Vasudevanpillai Biju; Tamitake Itoh; Tadaaki Kaneko; Yukihiro Ozaki
  JOURNAL OF PHYSICAL CHEMISTRY C, 113, 27, 11689, 11694, Jul. 2009, [Peer-reviewed]
  English, Scientific journal
• Evaluation of electromagnetic enhancement of surface enhanced hyper Raman scattering using plasmonic properties of binary active sites in single Ag nanoaggregates
  Tamitake Itoh; Hiroyuki Yoshikawa; Kenichi Yoshida; Vasudevanpillai Biju; Mitsuru Ishikawa
  JOURNAL OF CHEMICAL PHYSICS, 130, 21, Jun. 2009, [Peer-reviewed]
  English, Scientific journal
• A Novel Technique To Investigate the Decondensation of pc-DNA3.1-luc in Nuclear Sub-Domain with QD-FRET
  Sharif M. Shaheen; Hidetaka Akita; Atsushi Yamashita; Ryo Katoono; Nobuhiko Yui; Vasudevanpillai Biju; Mitsuru Ishikawa; Hideyoshi Harashima
  MOLECULAR THERAPY, 17, S330, S330, May 2009, [Peer-reviewed]
  English
• Optical force enhanced by plasmon resonance allowing position-sensitive synthesis and immobilization of single Ag nanoparticles on glass surfaces
  Tamitake Itoh; Vasudevanpillai Biju; Mitsuru Ishikawa; Syoji Ito; Hiroshi Miyasaka
  APPLIED PHYSICS LETTERS, 94, 14, Apr. 2009, [Peer-reviewed]
  English, Scientific journal
• Experimental evaluation of the twofold electromagnetic enhancement theory of surface-enhanced resonance Raman scattering
  Ken-ichi Yoshida; Tamitake Itoh; Vasudevanpillai Biju; Mitsuru Ishikawa; Yukihiro Ozaki
  PHYSICAL REVIEW B, 79, 8, Feb. 2009, [Peer-reviewed]
  English, Scientific journal
• Observing the cell surface using surface enhanced raman scattering (SERS) spectroscopy
  Tamitake Itoh; Hiroko Abe; Biju Vasudevan Pillai; Mitsuru Ishikawa
  AIST Today (International Edition), 34, 7, 8, 2009
  English, Scientific journal
• 2TP2-05 Trans-membrane delivery of semiconductor quantum dots in living cells(The 47th Annual Meeting of the Biophysical Society of Japan)
  Biju Vasudevanpillai; Anas Abdulaziz; Okuda Tetsuya; Itoh Tamitake; Ishikawa Mitsuru
  Seibutsu Butsuri, 49, S48, The Biophysical Society of Japan General Incorporated Association, 2009
  English
• 2P-071 Surface enhanced resonance raman scattering of HbA and HbA1c : Implications for diabetic diagnosis(Heme proteins,The 47th Annual Meeting of the Biophysical Society of Japan)
  Kiran Manikantan Syamala; Itoh Tamitake; Yoshida Kenichi; Kawashima Nagako; Biju Vasudevanpillai; Ishikawa Mitsuru
  Seibutsu Butsuri, 49, S117, The Biophysical Society of Japan General Incorporated Association, 2009
  English
• Semiconductor quantum dots and metal nanoparticles: syntheses, optical properties, and biological applications
  Vasudevanpillai Biju; Tamitake Itoh; Abdulaziz Anas; Athiyanathil Sujith; Mitsuru Ishikawa
  ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 391, 7, 2469, 2495, Aug. 2008, [Peer-reviewed]
  English
• Photosensitized breakage and damage of DNA by CdSe-ZnS quantum dots
  AbdulAziz Anas; Hidetaka Akita; Hideyoshi Harashima; Tamitake Itoh; Mitsuru Ishikawa; Vasudevanpillai Biju
  JOURNAL OF PHYSICAL CHEMISTRY B, 112, 32, 10005, 10011, Aug. 2008, [Peer-reviewed]
  English, Scientific journal
• Relations between dewetting of polymer thin films and phase-separation of encompassed quantum dots
  Ryodai Kanemoto; Abdulaziz Anas; Yusuke Matsumoto; Rintaro Ueji; Tamitake Itoh; Yoshinobu Baba; Shunsuke Nakanishi; Mitsuru Shikawa; Vasudevanpillai Biju
  JOURNAL OF PHYSICAL CHEMISTRY C, 112, 22, 8184, 8191, Jun. 2008, [Peer-reviewed]
  English, Scientific journal
• Surface enhanced Raman scattering analyses of individual silver nanoaggregates on living single yeast cell wall
  Athiyanathil Sujith; Tamitake Itoh; Hiroko Abe; Abdul Aziz Anas; Kenichi Yoshida; Vasudevanpillai Biju; Mitsuru Ishikawa
  APPLIED PHYSICS LETTERS, 92, 10, Mar. 2008, [Peer-reviewed]
  English, Scientific journal
• Photoluminescence quenching and intensity fluctuations of CdSe-ZnS quantum dots on an Ag nanoparticle film
  Yuusuke Matsumoto; Ryodai Kanemoto; Tamitake Itoh; Shunsuke Nakanishi; Mitsuru Ishikawa; Vasudevanpillai Biju
  JOURNAL OF PHYSICAL CHEMISTRY C, 112, 5, 1345, 1350, Feb. 2008, [Peer-reviewed]
  English, Scientific journal
• Optical and dynamic properties of water-soluble highly luminescent CdTe quantum dots
  Abhijit Mandal; Junichi Nakayama; Naoto Tamai; Vasudevanpillai Biju; Mitsuru Isikawa
  JOURNAL OF PHYSICAL CHEMISTRY B, 111, 44, 12765, 12771, Nov. 2007, [Peer-reviewed]
  English, Scientific journal
• Second enhancement in surface-enhanced resonance Raman scattering revealed by an analysis of anti-Stokes and Stokes Raman spectra (vol 76, pg 085405, 2007)
  Tamitake Itoh; Kenichi Yoshida; Vasudevanpillai Biju; Yasuo Kikkawa; Mitsuru Ishikawa; Yukihiro Ozaki
  PHYSICAL REVIEW B, 76, 12, Sep. 2007, [Peer-reviewed]
  English
• Quantum dot-insect neuropeptide conjugates for fluorescence imaging, transfection, and nucleus targeting of living cells
  Vasudevanpillai Biju; Damodaran Muraleedharan; Ken-ichi Nakayama; Yasuo Shinohara; Tamitake Itoh; Yoshinobu Baba; Mitsuru Ishikawa
  LANGMUIR, 23, 20, 10254, 10261, Sep. 2007, [Peer-reviewed]
  English, Scientific journal
• Second enhancement in surface-enhanced resonance Raman scattering revealed by an analysis of anti-Stokes and Stokes Raman spectra
  Tamitake Itoh; Kenichi Yoshida; Vasudevanpillai Biju; Yasuo Kikkawa; Mitsuru Ishikawa; Yukihiro Ozaki
  Physical Review B - Condensed Matter and Materials Physics, 76, 8, 06 Aug. 2007, [Peer-reviewed]
  English, Scientific journal
• COLL 494-Light and heat induced photoluminescence-variations in quantum dots
  Vasudevanpillai Biju; Tamitake Itoh; Mitsuru Ishikawa
  ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 234, Aug. 2007, [Peer-reviewed]
  English
• PHYS 525-Photoluminescence-variations of CdSe quantum dots and its relation to interactions of solvents and dissolved molecules on surface states
  Vasudevanpillai Biju; Tamitake Itoh; Mitsuru Ishikawa
  ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 234, Aug. 2007, [Peer-reviewed]
  English
• Second enhancement in surface-enhanced resonance Raman scattering revealed by an analysis of anti-Stokes and Stokes Raman spectra
  Tamitake Itoh; Kenichi Yoshida; Vasudevanpillai Biju; Yasuo Kikkawa; Mitsuru Ishikawa; Yukihiro Ozaki
  PHYSICAL REVIEW B, 76, 8, Aug. 2007, [Peer-reviewed]
  English, Scientific journal
• Photoinduced photoluminescence variations of CdSe quantum dots in polymer solutions
  Vasudevanpillai Biju; Ryodai Kanemoto; Yuusuke Matsumoto; Sayaka Ishii; Shunsuke Nakanishi; Tamitake Itoh; Yoshinobu Baba; Mitsuru Ishikawa
  JOURNAL OF PHYSICAL CHEMISTRY C, 111, 22, 7924, 7932, Jun. 2007, [Peer-reviewed]
  English, Scientific journal
• Combined spectroscopic and topographic characterization of nanoscale domains and their distributions of a redox protein on bacterial cell surfaces
  Vasudevanpillai Biju; Duohai Pan; Yuri A. Gorby; Jim Fredrickson; Jeff McLean; Daad Saffarini; H. Peter Lu
  LANGMUIR, 23, 3, 1333, 1338, Jan. 2007, [Peer-reviewed]
  English, Scientific journal
• Chapter 10 Interaction between metal-free porphine and surface Ag atoms through temporal fluctuation of surface- enhanced resonance raman scattering and background- light emission
  Tamitake Itoh; Kazuhiro Hashimoto; Vasudevanpillai Biju; Mitsuru Ishikawa; Bayden R. Wood; Yukihiro Ozaki
  Handai Nanophotonics, 3, 161, 174, 2007, [Peer-reviewed]
  English, Scientific journal
• Quenching of photoluminescence in conjugates of quantum dots and single-walled carbon nanotube
  Vasudevanpillai Biju; Tamitake Itoh; Yoshinobu Baba; Mitsuru Ishikawa
  JOURNAL OF PHYSICAL CHEMISTRY B, 110, 51, 26068, 26074, Dec. 2006, [Peer-reviewed]
  English, Scientific journal
• Variations in steady-state and time-resolved background luminescence from surface-enhanced resonance Raman scattering-active single Ag nanoaggregates
  Tamitake Itoh; Yasuo Kikkawa; Vasudevanpillai Biju; Mitsuru Ishikawa; Akifumi Ikehata; Yukihiro Ozaki
  JOURNAL OF PHYSICAL CHEMISTRY B, 110, 43, 21536, 21544, Nov. 2006, [Peer-reviewed]
  English, Scientific journal
• Close-conjugation of quantum dots and gold nanoparticles to sidewall functionalized single-walled carbon nanotube templates
  Vasudevanpillai Biju; Tamitake Itoh; Yoji Makita; Mitsuru Ishikawa
  JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 183, 3, 315, 321, Oct. 2006, [Peer-reviewed]
  English, Scientific journal
• Fabrication of a quantum dot-polymer matrix by layer-by-layer conjugation
  Sayaka Ishii; Rintaro Ueji; Shunsuke Nakanishi; Yuichiro Yoshida; Hideya Nagata; Tamitake Itoh; Mitsuru Ishikawa; Vasudevanpillai Biju
  JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 183, 3, 285, 291, Oct. 2006, [Peer-reviewed]
  English, Scientific journal
• Correlated measurements of plasmon resonance Rayleigh scattering and surface-enhanced resonance Raman scattering using a dark-field microspectroscopic system
  Tamitake Itoh; Yasuo Kikkawa; Kenichi Yoshida; Kazuhiro Hashimoto; Vasudevanpillai Biju; Mitsuru Ishikawa; Yukihiro Ozaki
  JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 183, 3, 322, 328, Oct. 2006, [Peer-reviewed]
  English, Scientific journal
• COLL 358-Close-packing of colloidal quantum dots: Photoluminescence properties of linear and spheroid assemblies of quantum dots
  Vasudevanpillai Biju; Tamitake Itoh; Mitsuru Ishikawa
  ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 232, Sep. 2006, [Peer-reviewed]
  English
• Elucidation of interaction between metal-free tetraphenylporphine and surface Ag atoms through temporal fluctuation of surface-enhanced resonance Raman scattering and background-light emission
  T Itoh; K Hashimoto; Biju, V; M Ishikawa; BR Wood; Y Ozaki
  JOURNAL OF PHYSICAL CHEMISTRY B, 110, 19, 9579, 9585, May 2006, [Peer-reviewed]
  English, Scientific journal
• Surface-enhanced resonance Raman scattering and background light emission coupled with plasmon of single Ag nanoaggregates
  T Itoh; Biju, V; M Ishikawa; Y Kikkawa; K Hashimoto; A Ikehata; Y Ozaki
  JOURNAL OF CHEMICAL PHYSICS, 124, 13, 1347081, 1347086, Apr. 2006, [Peer-reviewed]
  English, Scientific journal
• Subsecond luminescence intensity fluctuations of single CdSe quantum dots
  Biju, V; Y Makita; T Nagase; Y Yamaoka; H Yokoyama; Y Baba; M Ishikawa
  JOURNAL OF PHYSICAL CHEMISTRY B, 109, 30, 14350, 14355, Aug. 2005, [Peer-reviewed]
  English, Scientific journal
• Temperature-sensitive photoluminescence of CdSe quantum dot clusters
  Biju, V; Y Makita; A Sonoda; H Yokoyama; Y Baba; M Ishikawa
  JOURNAL OF PHYSICAL CHEMISTRY B, 109, 29, 13899, 13905, Jul. 2005, [Peer-reviewed]
  English, Scientific journal
• Display and retraction of outer membrane cytochromes by Shewanella oneidensis in response to electron acceptor availability
  Y Gorby; Biju, V; D Pan; J McLean; D Saffarini; J Fredrickson; HP Lu
  GEOCHIMICA ET COSMOCHIMICA ACTA, 69, 10, A671, A671, May 2005, [Peer-reviewed]
  English
• Structure and properties of narrow size-dispersed nanoclusters of quantum dots.
  VP Biju; Y Makita; H Yokoyama; Y Baba; M Ishikawa
  ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 229, U675, U675, Mar. 2005, [Peer-reviewed]
  English
• Intermittent single-molecule interfacial electron transfer dynamics.
  Biju, V; M Micic; DH Hu; HP Lu
  ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 229, U790, U790, Mar. 2005, [Peer-reviewed]
  English
• Novel properties of luminescent quantum dots and their application to nano-sensors
  Mitsuru Ishikawa; Vasudevan Pillai Biju
  IDW/AD '05: PROCEEDINGS OF THE 12TH INTERNATIONAL DISPLAY WORKSHOPS IN CONJUNCTION WITH ASIA DISPLAY 2005, VOLS 1 AND 2, 929, 932, 2005, [Peer-reviewed]
  English, International conference proceedings
• Synthesis of CdTe quantum dots using a heterogeneous process at low temperature and their optical and structural properties
  R Jose; Biju, V; Y Kamakoa; T Nagase; Y Makita; Y Shinohara; Y Baba; M Ishikawa
  APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 79, 8, 1833, 1838, Dec. 2004, [Peer-reviewed]
  English, Scientific journal
• Intermittent single-molecule interfacial electron transfer dynamics
  Biju, V; M Micic; DH Hu; HP Lu
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 126, 30, 9374, 9381, Aug. 2004, [Peer-reviewed]
  English, Scientific journal
• Dynamics of photoinduced electron-transfer processes in fullerene-based dyads: Effects of varying the donor strength
  KG Thomas; Biju, V; PV Kamat; MV George; DM Guldi
  CHEMPHYSCHEM, 4, 12, 1299, 1307, Dec. 2003, [Peer-reviewed]
  English
• Spatial heterogeneity in a polymer thin film probed by single molecules
  VP Biju; JY Ye; M Ishikawa
  JOURNAL OF PHYSICAL CHEMISTRY B, 107, 39, 10729, 10735, Oct. 2003, [Peer-reviewed]
  English, Scientific journal
• Fluorophore modified microcontact prints: A methodology for readout using fluorescence microscopy (vol 46, pg 155, 2002)
  Biju, V; M Gad; W Mizutani; S Murata; M Ishikawa
  JOURNAL OF IMAGING SCIENCE AND TECHNOLOGY, 46, 4, III, III, Jul. 2002, [Peer-reviewed]
  English
• Erratum: Fluorophore modified microcontact prints: A methodology for readout using fluorescence microscopy (Journal of Imaging Science and Technology (2002) 46 (155-158))
  V. Biju; M. Gad; W. Mizutani; S. Murata; M. Ishikawa
  Journal of Imaging Science and Technology, 46, 4, Jul. 2002
  English, Scientific journal
• Fabrication of standard samples for single-molecule fluorescence imaging
  Biju, V; M Takeuchi; K Umemura; M Gad; M Ishikawa
  JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 41, 3A, 1579, 1586, Mar. 2002, [Peer-reviewed]
  English, Scientific journal
• Fluorophore modified microcontact prints: A methodology for readout using fluorescence microscopy
  Biju, V; M Gad; W Mizutani; S Murata; M Ishikawa
  JOURNAL OF IMAGING SCIENCE AND TECHNOLOGY, 46, 2, 155, 158, Mar. 2002, [Peer-reviewed]
  English, Scientific journal
• Clusters of bis- and tris-fullerenes
  Biju, V; PK Sudeep; KG Thomas; MV George; S Barazzouk; PV Kamat
  LANGMUIR, 18, 5, 1831, 1839, Mar. 2002, [Peer-reviewed]
  English, Scientific journal
• Distribution of single molecules in polymer thin films
  Biju, V; M Yamauchi; M Ishikawa
  JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 140, 3, 237, 241, May 2001, [Peer-reviewed]
  English, Scientific journal
• Photoinduced electron transfer between 1,2,5-triphenylpyrrolidinofullerene cluster aggregates and electron donors
  Biju, V; S Barazzouk; KG Thomas; MV George; PV Kamat
  LANGMUIR, 17, 10, 2930, 2936, May 2001, [Peer-reviewed]
  English, Scientific journal
• Orientation-dependent electron transfer processes in fullerene-aniline dyads
  KG Thomas; Biju, V; DM Guldi; PV Kamat; MV George
  JOURNAL OF PHYSICAL CHEMISTRY A, 103, 50, 10755, 10763, Dec. 1999, [Peer-reviewed]
  English, Scientific journal
• Photoinduced charge separation and stabilization in clusters of a fullerene-aniline dyad
  KG Thomas; Biju, V; DM Guldi; PV Kamat; MV George
  JOURNAL OF PHYSICAL CHEMISTRY B, 103, 42, 8864, 8869, Oct. 1999, [Peer-reviewed]
  English, Scientific journal
• Photoinduced electron transfer in clusters of a fullerene-aniline dyad.
  KG Thomas; Biju, V; MV George; DM Guldi; PV Kamat
  ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 218, U317, U317, Aug. 1999, [Peer-reviewed]
  English
• Photoinduced charge separation in clusters of fullerene-aniline dyads
  Biju, V; KG Thomas; MV George; D Guldi; PV Kamat
  RECENT ADVANCES IN THE CHEMISTRY AND PHYSICS OF FULLERENES AND RELATED MATERIAL, VOL 7, 99, 12, 296, 303, 1999, [Peer-reviewed]
  English, International conference proceedings
• Excited-state interactions in pyrrolidinofullerenes
  KG Thomas; Biju, V; MV George; DM Guldi; PV Kamat
  JOURNAL OF PHYSICAL CHEMISTRY A, 102, 28, 5341, 5348, Jul. 1998, [Peer-reviewed]
  English, Scientific journal
• Studies on intramolecular photoinduced electron transfer processes in fullerene based donor-bridge-acceptor systems
  PV Kamat; D Guldi; Biju, V; KG Thomas; MV George
  RECENT ADVANCES IN THE CHEMISTRY AND PHYSICS OF FULLERENES AND RELATED MATERIALS, VOL 6, 98, 8, 273, 280, 1998, [Peer-reviewed]
  English, International conference proceedings
• Excited state behavior of fullero-phenylpyrrolidines
  PV Kamat; D Guldi; D Liu; KG Thomas; Biju, V; S Das; MV George
  PROCEEDINGS OF THE SYMPOSIUM ON RECENT ADVANCES IN THE CHEMISTRY AND PHYSICS OF FULLERENES AND RELATED MATERIALS, VOL 4, 97, 14, 122, 128, 1997, [Peer-reviewed]
  English, International conference proceedings

• Dual Emission Modulation of Zero-Dimensional Hybrid Copper Halides
  RAHUL Ghosh Dastidar; OKAMOTO Takuya; TAKAHASHI Kiyonori; TAKANO Yuta; BIJU Vasudevanpillai, 日本化学会春季年会講演予稿集(Web), 104th, 2024
• ミトコンドリア標的型DDSを基盤とした癌光治療の検証
  山田勇磨; 窪田文佳; 高野勇太; BIJU Vasudevanpillai; 真栄城正寿; 渡慶次学; 繁富香織; 宮武由甲子; 原島秀吉, 日本DDS学会学術集会プログラム予稿集, 38th, 2022
• 単一sp²炭素クラスターにおける物理・化学欠陥挙動のSERS分析
  伊藤民武; 山本裕子; 田丸博晴; BIJU Vasudevanpillai; 脇田慎一, プラズモニクスシンポジウム, 13th, 2016
• 光化学反応による金ナノクラスターの発光特性制御
  濱田守彦; 濱田守彦; 小原怜子; 小原怜子; 中西俊介; 脇田慎一; BIJU Vasudevanpillai, 光化学討論会要旨集(CD-ROM), 2015, 2015
• 単一SERSホットスポットにおけるスペクトル変化分析
  伊藤民武; 山本裕子; 田丸博晴; BIJU Vasudevanpillai; 脇田慎一, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 62nd, 2015
• 光化学表面改質による半導体量子ドットの明滅現象の抑制および発光強度の増強
  濱田守彦; 竹之越規史; 脇田慎一; 中西俊介; BIJU Vasudevanpillai, 日本化学会講演予稿集, 95th, 2, 2015
• ナノグラファイトクラスターにおける欠陥ダイナミクスのSERS分析
  伊藤民武; 山本裕子; 田丸博晴; BIJU Vasudevanpillai; 脇田慎一, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 76th, 2015
• 単一銀ナノ粒子2量体間隙に吸着した色素分子のSERSスペクトル変化
  伊藤民武; 山本裕子; 山本裕子; BIJU Vasudevanpillai; 脇田慎一; 田丸博晴, 光化学討論会要旨集(CD-ROM), 2015, 2015
• プラズモン共鳴による単一ラマンモードの選択的増強の観測
  伊藤民武; 山本裕子; 田丸博晴; BIJU Vasudevanpillai; 脇田慎一, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 61st, 2014
• 結合振動子モデルを用いた銀ナノ粒子2量体と色素分子で構成された電磁気学的強結合系の評価
  伊藤民武; 山本裕子; 田丸博晴; BIJU Vasudevanpillai; 脇田慎一; 尾崎幸洋, 光化学討論会要旨集(CD-ROM), 2014, 2014
• CdSe/ZnS量子ドット溶液の四光波混合分光
  小野万里; 廣澤佑亮; 香西浩嘉; 山崎尚哉; 宮川勇人; 鶴町徳昭; 小柴俊; 中西俊介; BIJU V., 応用物理・物理系学会中国四国支部合同学術講演会講演予稿集, 2013, 2013
• 銀ナノ粒子2量体と色素で構成されたプラズモン-分子双極子強結合系の古典的結合振動子モデルを用いた評価
  伊藤民武; 山本裕子; 田丸博晴; BIJU Vasudevanpillai; 脇田慎一; 尾崎幸洋, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 74th, 2013
• 光化学反応による量子ドットの発光強度の増強
  濱田守彦; 濱田守彦; 竹之越規史; 竹之越規史; 脇田慎一; 中西俊介; BIJU Vasudevanpillai; BIJU Vasudevanpillai, 光化学討論会講演要旨集, 2013, 2013
• 太陽電池特性向上に向けた光化学反応によるCdSe/ZnS量子ドット表面の不活化
  濱田守彦; 濱田守彦; 竹之越規史; 竹之越規史; 的崎圭司; FENG Qi; 脇田慎一; 中西俊介; BIJU Vasudevanpillai, 応用物理・物理系学会中国四国支部合同学術講演会講演予稿集, 2013, 2013
• 18pHB-4 Dynamic Interactions of CdSe/ZnS Quantum Dots with Dyclic Solvents Probed by Femtosecond Four-Wave Mixing
  Hirosawa Y.; Kouzai H.; Miyagawa H.; Tsurumachi N.; Koshiba S.; Nakanishi S.; Biju V. P, Meeting abstracts of the Physical Society of Japan, 67, 2, 673, 673, 24 Aug. 2012
  The Physical Society of Japan (JPS), Japanese
• Blinking Suppression in Semiconductor Quantum Dots and Single-molecule Imaging
  BIJU Vasudevan Pillai, 化学と工業 = Chemistry and chemical industry, 64, 8, 625, 625, 01 Aug. 2011
  English
• 25pHB-7 Solvent Effects on Optical Coherence of Colloidal CdSe/ZnS Quantum Dots
  Kouzai H.; Miyagawa H.; Tsurumachi N.; Koshiba S.; Itoh H.; Nakanishi S.; Biju V. P.; Ishikawa M., Meeting abstracts of the Physical Society of Japan, 66, 1, 741, 741, 03 Mar. 2011
  The Physical Society of Japan (JPS), Japanese
• 25pHB-8 Blinking Suppression in CdSe/ZnS Single Quantum Dots by Electron Transfer
  Hmada M.; Tsurumachi N.; Itoh H.; Nakanishi S.; Ishikawa M.; Biju V., Meeting abstracts of the Physical Society of Japan, 66, 1, 741, 741, 03 Mar. 2011
  The Physical Society of Japan (JPS), Japanese
• Elucidation of the Primary Events of Cell Signaling Favored by Quantum-Dot Single Molecule Imaging
  ISHIKAWA Mitsuru; BIJU Vasudevanpillai, 高分子, 60, 2, 76, 77, 01 Feb. 2011
  Japanese
• Photochemical Reaction of CdSe/ZnS Single Quantum Dots with Amine
  M. Hamada; N. Tsurumachi; S. Nakanishi; E. S. Shibu; M. Ishikawa; V. Biju, Proc. IQEC/CLEO Pacific Rim 2011, 381, 383, 2011
• Effect of solvents on optical coherence properties of CdSe/ZnS quantum dots in solution detected by femtosecond four-wave mixing
  H. Kouzai; Y. Hirosawa; H. Miyagawa; N. Tsurumachi; S. Koshiba; S. Nakanishi; V. Biju; M. Ishikawa, Proc. IQEC/CLEO Pacific Rim 2011, 2163, 2165, 2011
• 24aWQ-1 Solvent Effects on Optical Coherence of Colloidal CdSe/ZnS Quantum Dots
  Kouzai H.; Miyagawa H.; Tsurumachi N.; Koshiba S.; Itoh H.; Nakanishi S.; Biju V. P.; Ishikawa M., Meeting abstracts of the Physical Society of Japan, 65, 2, 645, 645, 18 Aug. 2010
  The Physical Society of Japan (JPS), Japanese
• 21pHW-7 Effects of Nanoparticles on Blinking of CdSe/ZnS Single Quantum Dots
  Hamada M.; Tsurumachi N.; Nakanishi S.; Itoh H.; Biju V.; Ishikawa M., Meeting abstracts of the Physical Society of Japan, 65, 1, 720, 720, 01 Mar. 2010
  The Physical Society of Japan (JPS), Japanese
• コロイド状CdSe/ZnS量子ドット溶液における位相緩和
  香西浩嘉; 宮川勇人; 鶴町徳昭; 小柴俊; 伊藤寛; 中西俊介; BIJU V. P.; 石川満, 応用物理学会中国四国支部・日本物理学会中国支部・四国支部・日本物理教育学会中国四国支部支部学術講演会講演予稿集, 2010, 2010
• CdSe/ZnS単一量子ドットにおける電子移動によるBlinking抑制
  濱田守彦; 宮川勇人; 鶴町徳昭; 小柴俊; 伊藤寛; 伊藤民武; 石川満; BIJU V.; 中西俊介, 応用物理学会中国四国支部・日本物理学会中国支部・四国支部・日本物理教育学会中国四国支部支部学術講演会講演予稿集, 2010, 2010
• 30aVD-3 Improvement of PL Properties of Semiconductor Quantum Dots by Interactions with Metal Nanoparticles
  Matsumoto Y.; Yamaoka H.; Tsurumachi N.; Itoh H.; Nakanishi S.; Biju V.; Itoh T.; Ishikawa M., Meeting abstracts of the Physical Society of Japan, 64, 1, 764, 764, 03 Mar. 2009
  The Physical Society of Japan (JPS), Japanese
• Surface Enhanced Raman Scattering Analyses of Individual Yeast Cell Walls : Single molecule analysis on cell surfaces
  ITOH T.; SUJITH A.; ABE H.; YOSHIDA K.; BIJU V.; ISHIKAWA M., レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan, 382, 37, 41, 15 Jan. 2009
  Japanese
• 19aZB-10 Photoinduced photoluminescence-variations of quantum-dot/polymer systems
  Knemoto R.; Ishii S.; Matsumoto Y.; Sugano K.; Itoh H.; Tsurumachi N.; Nakanishi S.; Biju Vasudevanpillai; Itoh T.; Ishikawa M., Meeting abstracts of the Physical Society of Japan, 62, 1, 711, 711, 28 Feb. 2007
  The Physical Society of Japan (JPS), Japanese
• Principle of SERS and its application to micro-bioimaging
  ITOH Tamitake; BIJU Vasudevanpillai; ISHIKAWA Mitsuru; YOSHIDA Kenichi; OZAKI Yukihiro; FUKUOKA Takao, 電気学会研究会資料. BMS, バイオ・マイクロシステム研究会 = The papers of Technical Meeting on Bio Micro Systems, IEE Japan, 2007, 1, 13, 19, 30 Jan. 2007
  Japanese
• Temperature-sensitive photoluminescence of CdSe quantum dot clusters.
  Vasudevanpillai Biju; Yoji Makita; Akinari Sonoda; Hiroshi Yokoyama; Yoshinobu Baba; Mitsuru Ishikawa, The journal of physical chemistry. B, 109, 29, 13899, 905, 28 Jul. 2005, [Peer-reviewed], [International Magazine]
  The formation of narrow size dispersed and nanometer size aggregates (clusters) of cadmium selenide (CdSe) quantum dots (QDs) and their temperature-sensitive photoluminescence (PL) spectral properties close to room temperature (298 K) are discussed. CdSe QDs formed stable clusters with an average diameter of approximately 27 nm in the absence of coordinating solvents. Using transmission electron microscopy (TEM) imaging, we identified the association of individual QDs with 2-5 nm diameters into clusters of uniform size. A suspension of these clusters in different solvents exhibited reversible PL intensity changes and PL spectral shifts which were correlated with temperature. Although the PL intensity of CdSe QDs encapsulated in host matrixes and the solid state showed a response to temperature under cryogenic conditions, the current work identified for the first time QD clusters showing temperature-sensitive PL intensity variations and spectral shifts at moderate temperatures above room temperature. Temperature-sensitive reversible PL changes of clusters are discussed with respect to reversible thermal trapping of electrons at inter-QD interfaces and dipole-dipole interactions in clusters. Reversible luminescence intensity variations and spectral shifts of QD clusters show the potential for developing sensors based on QD nanoscale assemblies., English
• 量子ドットクラスターの温度に依存する発光特性
  石川満; BIJU V. P.; 槙田洋二; 苑田晃成; 横山浩; 馬場嘉信; 馬場嘉信, 光化学討論会講演要旨集, 2005, 2005
• 蛍光性半導体量子ドットの低温合成法
  石川満; BIJU V P; JOSE R; 長瀬智美; 槙田洋二; 篠原康雄; 馬場嘉信, 光化学討論会講演要旨集, 2004, 2004
• 単一分子運搬のためのマイクロチャネル内における蛍光ナノ粒子拡散係数測定
  山岡禎久; DANG F; BIJU V P; 西本尚弘; 中西博昭; 篠原康雄; 石川満; 馬場嘉信, 化学とマイクロ・ナノシステム研究会講演要旨集, 10th, 2004

• Pi-Stacking-Induced Self-Assembly of CsPbBr3 into Supercrystals
  Aneesha SL; Takuya Okamoto; Vasudevanpillai Biju
  The 25th RIES - Hokudai International Symposium, 10 Dec. 2024, English, Poster presentation
  10 Dec. 2024 - 10 Dec. 2042
• Defect-Assisted Emission of Hybrid Indium Bromide Single Crystals
  Haichao Zhou, Takuya Okamoto, Kiyonori Takahashi, Biju Vasudevan Pillai
  日本化学会第105回春季年会（2025）, 26 Mar. 2025, English, Poster presentation
  26 Mar. 2025 - 29 Mar. 2025
• Synthesis of Titanium Nitride Semiconductor Nanocrystals
  Aswathi Maladan, Takuya Okamoto, Biju Vasudevanpillai, Subrahmanyam Challapalli, Most Farida Khatun, Mohit Kumar
  日本化学会第105回春季年会（2025）, 26 Mar. 2025, English, Poster presentation
  26 Mar. 2025 - 29 Mar. 2025
• Stabilization of Inter-halogen Interfaces in Heterojunction Halide Perovskites
  Yifei Xia, Most Farida Khatun, Takuya Okamoto, Biju Vasudevan Pillai
  日本化学会第105回春季年会（2025）, 26 Mar. 2025, English, Poster presentation
  26 Mar. 2025 - 29 Mar. 2025
• Perovskite Nanocrystal Assembly Formation by π–π Stacking Interaction of Ligands
  Aneesha SL, Takuya Okamoto, Biju Vasudevan Pillai
  日本化学会第105回春季年会（2025）, 26 Mar. 2025, English, Poster presentation
  26 Mar. 2025 - 29 Mar. 2025
• Nanobioconjugates for Molecular, Cellular, and In Vivo Imaging
  Biju Vasudevan Pillai
  International Conference on Recent Advances in Smart Materials and Molecular Imaging, Mar Ivanios College, Trivandrum, India, 21 Mar. 2025, English, Nominated symposium
  21 Mar. 2025 - 21 Mar. 2025, [Invited]
• Opportunities and Challeges for Indians in the Emerging Academic World
  Biju Vasudevan Pillai
  National Science Day Lecture Organized by the Kerala State Science and Technology Council, Trivandrum, India, 28 Feb. 2025, English, Public discourse
  28 Feb. 2025 - 28 Feb. 2025, [Invited]
• Dynamic Excitons in Semiconductors
  Biju Vasudevan Pillai
  International Conference on Emerging Magterials for Sustainable Development 2025, 20 Feb. 2025, English, Invited oral presentation
  20 Feb. 2025 - 20 Feb. 2025, [Invited]
• Controlling Anion Exchange in Lead Halide Perovskite Heterojunction
  Yifei Xia, Most. Farida Khatun, Takuya Okamoto, Vasudevanpillai Biju
  The 25th RIES - Hokudai International Symposium, 10 Dec. 2024, English, Poster presentation
  10 Dec. 2024 - 10 Dec. 2024
• Defect-Assisted Emission from (C10H22N2)4In4Br20 Crystals
  Haichao Zhou, Takuya Okamoto, Kiyonori Takahashi, Yuta Takano, Vasudevan Pillai Biju
  The 25th RIES - Hokudai International Symposium, 10 Dec. 2024, English, Poster presentation
  10 Dec. 2024 - 10 Dec. 2024
• Rod-shaped Spinel Co3O4 and Carbon Nitride Heterostructure Modified Fluorine-Doped Tin Oxide Electrode as an Electrochemical Transducer for Efficient Sensing of Hydrazine
  Aswathi Maladan; Vasudevanpillai Biju; Asha Ramesh; Pravat Kumar Sahu; Suryakala Duvvuri; Ch Subrahmanyam
  The 25th RIES - Hokudai International Symposium, 10 Dec. 2024, Bengali, Poster presentation
  10 Dec. 2024 - 10 Dec. 2024
• Ultrafast Photoluminescence Blinking of MAPbI3 Quantum Dots Coupled with Au Nanorods Plasmon
  Tianci Wang, Lei Duan, Takuya Okamoto, Vasudevanpillai Biju
  The 25th RIES - Hokudai International Symposium, 10 Dec. 2024, English, Poster presentation
  10 Dec. 2024 - 10 Dec. 2024
• Exciton Recombination and Defect Control in Halide Perovskite Single Quantum Dots
  Biju Vasudevan Pillai
  2024 RIES-CEMS Symposium, NYCTU, Taiwan, 28 Nov. 2024, English, Nominated symposium
  28 Nov. 2024 - 29 Nov. 2024, [Invited]
• Photoluminescence Enhancement in Zero-Dimensional Hybrid Copper Halide Microcrystals
  Rahul GHOSH DASTIDAR, Takuya OKAMOTO, Vasudevanpillai BIJU
  2024年 光化学討論会, 03 Sep. 2024, English, Poster presentation
  03 Sep. 2024 - 05 Sep. 2024
• Ultrafast Photoluminescence Blinking in MAPbI3 Perovskite Quantum Dots on Gold Nanoparticles
  Tianci WANG, Lei DUAN, Takuya OKAMOTO, Vasudevanpillai BIJU
  2024年 光化学討論会, 03 Sep. 2024, English, Poster presentation
  03 Sep. 2024 - 05 Sep. 2024
• JPA Award 2023 Award Lecture "Blinking Suppression and Photoluminescence Enhancement in Semiconductor Quantum Dots”
  Biju Vasudevan Pillai
  2024年光化学討論会, 03 Sep. 2024, English, Invited oral presentation
  03 Sep. 2024 - 05 Sep. 2024, [Invited]
• Organic Molecular NearInfrared Photocatalyst Based on Sulfone-rosamine
  Kazuya YOSHIDA, Yoshiyuki KAWABATA, Tatsuo NAKAGAWA, Toshiaki SUZUKI, Vasudevanpillai BIJU, Yuta TAKANO
  2024年 光化学討論会, 03 Sep. 2024, English, Oral presentation
  03 Sep. 2024 - 05 Sep. 2024
• Excitons in Semiconductor Quantum Dots
  Biju Vasudevan Pillai
  APJ Abdul Kalam Technological University Workshop Series, 30 Aug. 2024, English, Nominated symposium
  30 Aug. 2024 - 31 Aug. 2024, [Invited]
• Dual Emission Modulation of Zero-Dimensional Hybrid Copper Halides
  R. G. Dastidar; T. Okamoto; V. P. Biju
  日本化学会 第104春季年会, 18 Mar. 2024, English, Oral presentation
  18 Mar. 2024 - 24 Mar. 2024
• Plasmon-influenced photoluminescence blinking behavior of lead halide perovskite quantum dots
  T. Wang; T. Okamoto; V. P. Biju
  日本化学会 第104春季年会, 18 Mar. 2024, English, Poster presentation
  18 Mar. 2024 - 24 Mar. 2024
• 化学修飾による半導体ナノ結晶のマイクロコンタクトプリンティング
  岡本 拓也; Vasudevan; Pillai Biju
  日本化学会 第104春季年会, 18 Mar. 2024, Japanese, Poster presentation
  18 Mar. 2024 - 24 Mar. 2024
• Controlling anion exchange in lead halide perovskite microcrystals
  Y. Xia; V. P. Biju
  化学系学協会北海道支部2024年冬季研究発表会, 23 Jan. 2024, English, Poster presentation
  23 Jan. 2024 - 24 Jan. 2024
• Excitonic and biexcitonic recombination processes in halide perovskites
  L. Duan; V. P. Biju
  化学系学協会北海道支部2024年冬季研究発表会, 23 Jan. 2024, English, Poster presentation
  23 Jan. 2024 - 24 Jan. 2024
• Photoinduced electron transfer in halide perovskite-based donor-acceptor systems for solar energy harvesting
  K. Xu; V. P. Biju
  化学系学協会北海道支部2024年冬季研究発表会, 23 Jan. 2024, English, Poster presentation
  23 Jan. 2024 - 24 Jan. 2024
• Excitons and free carriers in semiconductor quantum dot systems
  Vasudevan Pillai Biju
  ICAMS 2023, 21 Dec. 2023, English, Invited oral presentation
  21 Dec. 2023 - 23 Dec. 2023, [Invited]
• Excitons and Free Carriers in Quantum Dots
  Vasudevan Pillai Biju
  ICMM2023, 16 Dec. 2023, English, Invited oral presentation
  16 Dec. 2023 - 18 Dec. 2023, [Invited]
• Halide perovskite supercrystals and self-assemblies prepared using organic ligands
  T. Wang; T. Okamoto; V. P. Biju
  The 2023 RIES–CEFMS Joint International Symposium, 07 Dec. 2023, English, Poster presentation
  07 Dec. 2023 - 08 Dec. 2023
• Low dimensional metal halide fluorecent crystals
  Dastidar Ghosh Rahul; 岡本 拓也; Vasudevan; Pillai Biju
  The 2023 RIES–CEFMS Joint International Symposium, 07 Dec. 2023, English, Poster presentation
  07 Dec. 2023 - 08 Dec. 2023
• Excitons in Halide Perovskite Assemblies
  T. Okamoto; V. P. Biju
  The 2023 RIES–CEFMS Joint International Symposium, 07 Dec. 2023, English, Poster presentation
  07 Dec. 2023 - 08 Dec. 2023
• Low-Dimensional Fluorescent Hybrid Metal Halide Crystals
  R. D. Ghosh; T. Okamoto; C. Subrahmanyam; V. P. Biju
  The 24th RIES-HOKUDAI INTERNATIONAL SYMPOSIUM, 06 Dec. 2023, English, Poster presentation
  06 Dec. 2023 - 07 Dec. 2023
• Methylammonium lead bromide perovskite supercrystals prepared by ligand exchange on nanocrystals
  T. WANG; T. Okamoto; V. P. Biju
  The 24th RIES-HOKUDAI INTERNATIONAL SYMPOSIUM, 06 Dec. 2023, English, Poster presentation
  06 Dec. 2023 - 07 Dec. 2023
• Development of Photo-functional Mesoscopic Quantum Dot Assemblies
  R. Akter; Y. Takano; N. Kirkwood; P. Malvaney; V. P. Biju
  The 24th RIES-HOKUDAI INTERNATIONAL SYMPOSIUM, 06 Dec. 2023, English, Poster presentation
  06 Dec. 2023 - 07 Dec. 2023
• Defect Passivation and Halide Exchange in Amphiphilic Ligand-Capped CsPbBr3 Perovskite Nanocrystals
  F. M. Khatun; T. Okamoto; V. P. Biju
  The 24th RIES-HOKUDAI INTERNATIONAL SYMPOSIUM, 06 Dec. 2023, English, Poster presentation
  06 Dec. 2023 - 07 Dec. 2023
• Excitons in Halide Perovskite Nanocrystals and Assemblies
  T. Okamoto; V. P. Biju
  APC2023, 27 Nov. 2023, English, Invited oral presentation
  27 Nov. 2023 - 01 Dec. 2023, [Invited]
• Interfacial Defect Passivation of Amphiphilic Ligand Capped Highly Luminescent Halide Perovskite Nanocrystals
  F. M. Khatun; S. Ghimire; S. Mahesha. Bhagyashree; T. Okamoto; Jeladhara Sobhanan; C. Subrahmanyam; V. P. Biju
  14th ISAJ Annual Symposium, 10 Nov. 2023, English, Poster presentation
  10 Nov. 2023 - 10 Nov. 2023
• Low-Dimensional Fluorescent Hybrid Metal Halide Crystals
  R. G. Dastidar; T. Okamoto; C. Subrahmanyam; V. P. Biju
  14th ISAJ Annual Symposium, 10 Nov. 2023, English, Poster presentation
  10 Nov. 2023 - 10 Nov. 2023
• An Efficient electron transport from Perovskites Nanocrystals to A C60-RCOOH ligand for solar cells Development
  R. Akter; T. Wang; S. Palyam; T. Okamoto; Y. Takano; V. P. Biju
  14th ISAJ Annual Symposium, 10 Nov. 2023, English, Poster presentation
  10 Nov. 2023 - 10 Nov. 2023
• Luminescent 0D Hybrid Copper Halide Single Crystals
  R. D. Ghosh*, T. Okamoto and V. P. Biju
  2023年光化学討論会, 05 Sep. 2023, English, Poster presentation
  05 Sep. 2023 - 07 Sep. 2023
• Thermodynamically Controlled Crystallization of Perovskite Single Crystals
  D. Zhang; T. Okamoto; V. P. Biju
  2023年光化学討論会, 05 Sep. 2023, English, Poster presentation
  05 Sep. 2023 - 07 Sep. 2023
• Slipping-Free Halide Perovskite Supercrystals Formed from Nanocrystals using Bidentate Ligands
  T. Okamoto; V. P. Biju
  2023年光化学討論会, 05 Sep. 2023, Japanese, Oral presentation
  05 Sep. 2023 - 07 Sep. 2023
• Simulated Solar Light Harvesting Efficiencies of FAPbI3 Perovskite-based Solar Cells
  Xu Kangjian; alyam Subramanyam; 岡本 拓也; Vasudevan; Pillai Biju
  日本化学会北海道支部2023年夏季研究発表会, 03 Sep. 2023, English, Poster presentation
  03 Sep. 2023 - 03 Sep. 2023
• Interfacial electron transfer in FAPbI3 perovskite-based electron donor-accepter systems
  Wang Qiankun; asudevan Pillai Biju
  日本化学会北海道支部2023年夏季研究発表会, 03 Sep. 2023, English, Poster presentation
  03 Sep. 2023 - 03 Sep. 2023
• Exciton and charge carrier recombination dynamics in halide perovskites crystals: a study of crystal size effects
  L. Duan , S. Palyam, T. Okamoto and V. P. Biju
  日本化学会北海道支部2023年夏季研究発表会, 03 Sep. 2023, English, Poster presentation
  03 Sep. 2023 - 03 Sep. 2023
• Heat-Induced Modulating the Excitonic Properties of Halide Perovskite Assemblies using Polymer Microenvironments
  F. M. Khatun; T. Okamoto; V. P. Biju
  ICP2023, 01 Sep. 2023, English, Poster presentation
  01 Sep. 2023 - 01 Sep. 2023
• Exciton Recombination Dynamics in Halide Perovskite Nanocrystals, Microcrystals, and Supercrystals
  Vasudevan Pillai Biju
  Department Special Lecture, 01 Sep. 2023, English, Invited oral presentation
  01 Sep. 2023 - 01 Sep. 2023, [Invited]
• Structures and Optical Properties of Halide Perovskite Assemblies
  T. Okamoto; V. P. Biju
  ICP2023, 23 Jul. 2023, English, Poster presentation
  23 Jul. 2023 - 28 Jul. 2023
• The study on the crystallization of MAPbBr3 single crystal by a modified inverse temperature crystallization method
  D. Zhang; T. Okamoto; V. P. Biju
  ICP2023, 23 Jul. 2023, English, Poster presentation
  23 Jul. 2023 - 28 Jul. 2023
• Fluorescent probe molecules that “store” singlet oxygen detection
  Y. Takano; D. Sasikumar; H. Zhao; Y. Miyatake; V. P. Biju
  ICP2023, 23 Jul. 2023, English, Oral presentation
  23 Jul. 2023 - 28 Jul. 2023
• Heat-Induced Modulating the Excitonic Properties of Halide Perovskite Assemblies using Polymer Microenvironments
  F. M. Khatun; T. Okamoto; V. P. Biju
  ICP2023, 23 Jul. 2023, English, Poster presentation
  23 Jul. 2023 - 28 Jul. 2023
• Exciton and carrier dynamics in halide perovskite crystals
  Vasudevan Pillai Biju
  Emerging Materials 2023, 13 Jul. 2023, English, Invited oral presentation
  13 Jul. 2023 - 15 Jul. 2023
• 硫黄原子のd*−π*混成軌道を利用した光温熱がん治療向け近赤外光吸収色
  吉田 和矢; 小阪田 泰子; 藤塚 守; Vasudevan; Pillai Biju; 髙野 勇太
  日本ケミカルバイオロジー学会 第17回年会, 29 May 2023, English, Oral presentation
  31 May 2023
• 癌の光温熱治療に向けた近赤外光吸収有機分子の開発
  吉田 和矢; Vasudevan Pillai Biju; 髙野 勇太
  日本化学会103春季年会（2023）, 22 Mar. 2023
  23 Mar. 2023 - 25 Mar. 2023
• 二座配位子により形成したハロゲン化鉛ペロブスカイト超結晶の構造と光物性
  岡本 拓也; Vasudevan Pillai Biju
  日本化学会103春季年会（2023）, 22 Mar. 2023, English, Poster presentation
  22 Mar. 2023 - 25 Mar. 2023
• Porphyrin-based Near-Infrared Photosensitizers for Singlet Oxygen Generation
  Zhao Hanjun; 髙野 勇太; 宮武 由甲子; Vasudevan; Pillai Biju
  日本化学会103春季年会（2023）, 22 Mar. 2023, English, Poster presentation
  22 Mar. 2023 - 25 Mar. 2023
• 三次元培養すい癌細胞における死細胞成分-表面修飾蛍光ビーズの動態観察
  髙野 勇太; 宮武 由甲子; 繁富 香織; Vasudevan; Pillai Biju
  日本化学会103春季年会（2023）, 22 Mar. 2023, English, Poster presentation
  22 Mar. 2023 - 25 Mar. 2023
• トリアゾールカルボアルデヒド誘導体による N 末端修飾を利用した緑色蛍光タンパク質のガラス基板への固定化と一分子蛍光観察
  張 晏; Zhang Dong; 小野田 晃; Vasudevan; Pillai Biju
  日本化学会103春季年会（2023）, 22 Mar. 2023, English, Poster presentation
  22 Mar. 2023 - 25 Mar. 2023
• Benzoquinone Systems for Photoinduced Interfacial Electron Transfer
  Q. Wang; V. P. Biju
  化学系学協会北海道支部2023年冬期研究会, 25 Jan. 2023, English, Poster presentation
  25 Jan. 2023 - 25 Jan. 2023
• Perovskite Nanocrystal Benzoquinone Systems for solar cells
  XU KANGJIAN; asudevan; Pillai Biju
  化学系学協会北海道支部2023年冬期研究会, 25 Jan. 2023, English, Poster presentation
  25 Jan. 2023 - 25 Jan. 2023
• Reabsorption-Emission in Methylammonium Lead Bromide Perovskite Single Crystals
  Duan Lei; asudevan Pillai Biju
  化学系学協会北海道支部2023年冬期研究会, 25 Jan. 2023, English, Poster presentation
  25 Jan. 2023 - 25 Jan. 2023
• Assembly-Assisted Carrier Relaxation in Formamidinium Lead Bromide Quantum Dots
  F. M. Khatun; V. P. Biju
  化学系学協会北海道支部2023年冬期研究会, 25 Jan. 2023, English, Oral presentation
  25 Jan. 2023 - 25 Jan. 2023
• π-Extended Porphyrin Photosensitizers for Near-Infrared Light-Mediated Singlet Oxygen Generation
  Zhao Hanjun; 髙野 勇太; Vasudevan; Pillai Biju
  化学系学協会北海道支部2023年冬期研究会, 25 Jan. 2023, English, Oral presentation
  25 Jan. 2023 - 25 Jan. 2023
• Homogeneous MAPbBr3 Microcrystals Prepared by Controlling the Crystal Growth Thermodynamics
  D. Zhang; V. P. Biju
  化学系学協会北海道支部2023年冬期研究会, 25 Jan. 2023, English, Oral presentation
  25 Jan. 2023 - 25 Jan. 2023
• Interfacial Electron Transfer From Methylammonium Lead Bromide Nanocrystals to a Ligand-Engineered C60 Acceptor
  Akter Rumana; asudevan Pillai Biju
  化学系学協会北海道支部2023年冬期研究会, 25 Jan. 2023, English, Oral presentation
  25 Jan. 2023 - 25 Jan. 2023
• ロサミン骨格を利用した近赤外光温熱分子の開発
  吉田 和矢; Vasudevan Pillai Biju; 髙野 勇太
  化学系学協会北海道支部2023年冬期研究会, 25 Jan. 2023, English, Poster presentation
  25 Jan. 2023 - 25 Jan. 2023
• Exciton and Free Electron Dynamicsin Hybrid Halide Perovskites
  V. P. Biju
  MATCON 2023, 12 Jan. 2023, English, Invited oral presentation
  12 Jan. 2023 - 14 Jan. 2023, [Invited]
• Roles of Additives and Solvent in the Formation of Homogeneous MAPbBr3 Microcrystals
  D. Zhang; T. Okamoto; V. P. Biju
  RIES international symposiumu"拓", 05 Dec. 2022, English, Nominated symposium
  05 Dec. 2022 - 06 Dec. 2022
• Photoinduced Electron Transfer from Isolated MAPbBr3 Nanocrystals and Their Self-Assembled Films to C60-based Ligands
  A. Rumana; S. Mahesha. Bhagyashree; S. Palyam; Y. Takano; V. P. Biju
  RIES international symposiumu"拓", 05 Dec. 2022, English, Nominated symposium
  05 Dec. 2022 - 06 Dec. 2022
• Near-Infrared Light Absorbing Dye Molecules for Photothermal Cancer Therapy
  K. Yoshida; Y. Takano; V. P. Biju
  RIES international symposiumu"拓", 05 Dec. 2022, English, Poster presentation
  05 Dec. 2022 - 06 Dec. 2022
• π-Extended Porphyrin-based Photosensitizers for Singlet Oxygen Generation
  Zhao Hanjun; 髙野 勇太; 宮武 由甲子; Vasudevan; Pillai Biju
  RIES international symposiumu"拓", 05 Dec. 2022, English, Poster presentation
  05 Dec. 2022 - 06 Dec. 2022
• Photoinduced Electron Transfer from FAPbI3 PNCs to Cyano Benzoquinones
  K. Xu; S. Palyam; V. P. Biju
  RIES international symposiumu"拓", 05 Dec. 2022, English, Poster presentation
  05 Dec. 2022 - 06 Dec. 2022
• Photoinduced Electron Transfer from FAPbI3 PNCs to Chloro Benzoquinones
  Q. Wang; S. Palyam; V. P. Biju
  RIES international symposiumu"拓", 05 Dec. 2022, English, Poster presentation
  05 Dec. 2022 - 06 Dec. 2022
• Crystal Size-Dependent Photoluminescence of Methylammonium Lead Bromide Perovskite
  L. Duan; T. Okamoto; V. P. Biju
  RIES international symposiumu"拓", 05 Dec. 2022, English, Poster presentation
  05 Dec. 2022 - 06 Dec. 2022
• Relations of Oxygen and Electron Transfer to Photoluminescence of Methylammonium Lead Iodide Perovskite Nanocrystals
  Chouhan Lata; Ghimire Sushan; Vasudevan Pillai Biju
  日本化学会第99春季年会, 16 Mar. 2019, English, Oral presentation
• Steady-state Spectroscopic Studies of the Kinetics of Singlet Oxygen Sensing by 9-Substituted Anthracene Derivatives
  D. Sasikumar*, Y. Takano, K. Yuyama and V. P. Biju, 16 Mar. 2019, English, Oral presentation
• Incessant and Intermittent Photoluminescence from Semiconductor Nanocrystals: Challenges and Prospects
  V. P. Biju
  MATCOM2019, 14 Mar. 2019, English, Invited oral presentation
  [Invited]
• Photosensitized generation of singlet oxygen by Rose Bengal and its reaction with 9-substituted Anthracene
  V. P. Biju
  化学系学協会北海道支部2019年冬季研究発表会, 22 Jan. 2019, English, Poster presentation
• Lifetime of Photogenerated Charge Carriers in 0-, 1-, 2- and 3D Perovskite Structures
  V. P. Biju
  化学系学協会北海道支部2019年冬季研究発表会, 22 Jan. 2019, English, Poster presentation
• Optical Control of Charge-Carrier Diffusion and Confinement in Perovskite Nanocrystal Films
  V. P. Biju
  化学系学協会北海道支部2019年冬季研究発表会, 22 Jan. 2019, Bengali, Invited oral presentation
  [Invited]
• Single Particle Microspectroscopic Detection of the Dynamics of Perovskite Nanocrystal Blinking
  Vasudevan Pillai Biju
  化学系学協会北海道支部2019年冬季研究発表会, 20 Jan. 2019, English, Poster presentation
• Crystallization of Methylammonium Lead Halide Perovskites Controlled by Laser Trapping at Solution Surface
  K. Yuyama; J. M. Islam; V. P. Biju
  APC2018, 16 Dec. 2018, English, Oral presentation
• The Dynamics of Photogenerated Charge Carriers in Perovskite Nanocrystal Films
  Sushant Ghimire; 柚山 健一; 髙野 勇太; Vasudevan; Pillai Biju
  APC2018, 16 Dec. 2018, English, Oral presentation
• Blinking Suppression of CdSe/ZnS Quantum Dots by Photoinduced Electron Transfer under Large Positive Free Energy Change
  V. P. Biju
  APC2018, 16 Dec. 2018, English, Invited oral presentation
  [Invited]
• Kinetic Studies of Singlet Oxygen sensing using 9-substituted anthracene derivatives; Comparison of coumarin conjugated anthracene with 9-methyl anthracene
  D. Sasikumar; Y. Takano; K. Yuyama; V. P. Biju
  The 19th RIES-HOKUDAI International Symposium, 12 Dec. 2018, English, Poster presentation
• Control of Perovskite Nanocrystal Oxidation by Charge Carrier Trapping
  L. Chouhan; S. Ghimire; K. Yuyama; Y. Takano; V. P. Biju
  The 19th RIES-HOKUDAI International Symposium, 11 Dec. 2018, English, Poster presentation
• Blinking Suppression in Quantum Dots by Electron Transfer under Large Positive Gibbs Energy Change
  V. P. Biju
  14th IUPAC International Conference on Novel Materials and their Synthesis, 21 Sep. 2018, English, Invited oral presentation
  [Invited]
• 酸性条件下でのニワトリ卵白リゾチームの光捕捉挙動
  柚山 健一; Islam Md Jahidul; Biju Vasudevan Pillai
  2018年光化学討論会, 05 Sep. 2018, English, Poster presentation
  [Domestic Conference]
• Crystallization of mixed chloride-bromide methylammonium lead perovskites by optical trapping at solution surface
  Md Jahidul Islam; Kenichi Yuyama; Katsuaki Konishi; Biju Vasudevan Pillai
  2018年光化学討論会, 05 Sep. 2018, English, Poster presentation
  [Domestic Conference]
• Electron Transfer under Large Positive Gibbs Energy: Highly-excited Quantum Dots for Energy Harnessing and Photocatalysis
  BIJU Vasudevan Pillai
  水素社会のための第３回国際シンポジウム, 22 Aug. 2018, English, Public symposium
  [Invited], [Domestic Conference]
• Photoluminescence of Semiconductor Quantum Dots: The Roles of Electron Donors/Acceptors and Incident Photon Flux
  BIJU Vasudevan Pillai
  NANO2018, 24 Jun. 2018, English, Keynote oral presentation
  [Invited], [International presentation]
• Extended Diffusion of Charge Carriers in Perovskite Nanocrystal Assembly
  Sushant GHIMIRE; Lata CHOUHAN; Ken-ichi YUYAMA; Yuta TAKANO; Vasudevan Pillai Biju
  日本化学会第98春季年会2018, 20 Mar. 2018, English, Oral presentation
  [Domestic Conference]
• Semiconductor Quontum Dots in Bioimagion: Progress and Challenges
  BIJU Vasudevan Pillai
  9th Bangalore India NANO, 07 Dec. 2017, English, Invited oral presentation
  [Invited], [International presentation]
• Semiconductore Quantum Dots for Single-molecule Detections in Living Cells: Challenges and Progress
  BIJU Vasudevan Pillai
  Nanobiotechnology, 06 Dec. 2017, English, Invited oral presentation
  [Invited], [International presentation]
• Semiconductor Quantum Dots in Single Molecule Detections: Prospects and challenges
  BIJU Vasudevan Pillai
  ICPA, 10 Nov. 2017, English, Invited oral presentation
  [Invited], [International presentation]
• Quantum Dots for Single Molecule Detections: Recent Progress and Challenges
  BIJU Vasudevan Pillai
  2017 RIES-CIS Symposium, 27 Oct. 2017, English, Invited oral presentation
  [Invited], [International presentation]
• Single molecule detections &Bioimaging using Semiconductor Nanocrystals.
  BIJU Vasudevan Pillai
  Emerging Frontiers in Chemical Science 2017, 23 Sep. 2017, English, Oral presentation
  [International presentation]
• A Few Intracellular Pathways Of Quantum Dot Bioconjugates
  BIJU Vasudevan Pillai
  MAF2017, 12 Sep. 2017, English, Invited oral presentation
  [Invited], [International presentation]
• A fluorescence sensor for real-time monitoring of singlet oxygen
  Reiko Kohara; BIJU Vasudevan Pillai
  日本化学会第97回春季年会（2017）, 16 Mar. 2017, English, Oral presentation
  [Domestic Conference]
• Luminescent Semiconductor Nanocrystals: Challenges and Prospects
  BIJU Vasudevan Pillai
  International Symposium on “New Trends in Applied Chemistry" (NTAC2017), 09 Feb. 2017, English, Invited oral presentation
  [Invited], [International presentation]
• Selective and sensitive detection of singlet oxygen using a novel fluorogenic molecular sensor
  Reiko Kohara; BIJU Vasudevan Pillai
  The 17th RIES-HOKUDAI INTERNATIONAL SYMPOSIUM on JU, 13 Dec. 2016, English, Poster presentation
  [International presentation]
• Luminescent Quantum Dots in Biomaging
  BIJU Vasudevan Pillai
  The 17th RIES-HOKUDAI INTERNATIONAL SYMPOSIUM on JU, 13 Dec. 2016, English, Invited oral presentation
  [Invited], [International presentation]
• Blinking and Bleaching Quantum Dots in Single-molecule Detections
  BIJU Vasudevan Pillai
  Asian Photochemistry Conference 2016, 04 Dec. 2016, English, Invited oral presentation
  [Invited], [International presentation]
• Impeding Oxidation and Blinking in Single Semiconductor Quantum Dots
  BIJU Vasudevan Pillai
  Department of Applied Chemistry Seminar, 04 Nov. 2016, English, Public discourse
  [Invited], [Domestic Conference]
• Fluorescence Sensing of Nanomaterials by Photosensitization Reactions
  BIJU Vasudevan Pillai
  Asia Nano 2016, 10 Oct. 2016, English, Poster presentation
  [International presentation]
• Incessant and Intermittent Photoluminescence of Quantum Dots in Single Molecule Detections
  BIJU Vasudevan Pillai
  AsiaNANO2016, 10 Oct. 2016, English, Invited oral presentation
  [Invited], [International presentation]
• Single-molecule Detection using Quantum Dot Labels: Challenges and Prospects
  BIJU Vasudevan Pillai
  HOKUDAI-NCTU Joint Symposium on Nano, Photo and Bio Sciences in 2016, 04 Oct. 2016, English, Invited oral presentation
  [Invited], [International presentation]

• 環境解析学総論, 2024年, 修士課程, 環境科学
• 大学院共通授業科目（教育プログラム）：One program for Global Goals, 2024年, 修士課程, 大学院共通科目
• 再生可能エネルギー総論, 2024年, 修士課程, 環境科学
• 光電子科学特論Ⅰ, 2024年, 修士課程, 環境科学院
• 環境物質科学特別講義Ⅳ, 2024年, 修士課程, 環境科学院

• Development and elucidation of highly efficient photoreaction systems using a strong coupling between nanocavity and plasmon
  Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research
  23 Apr. 2018 - 31 Mar. 2023
  三澤 弘明; 笹木 敬司; 上野 貢生; Biju V・Pillai; 村越 敬
  電磁場シミュレーションにより、本モード強結合とアンサンブル強結合との差異に関する理解を深めた。その中で、金ナノディスクの密度が比較的低い状態においては、結合強度がアンサンブル強結合と同様ディスク数の1/2乗に比例して増強されることを確認したが、数密度が増大して金ナノディスク間距離が近接すると近接場相互作用により、結合強度がアンサンブル強結合に比べて増強することを明らかにし、実験的にもそれを確認した。
  また、金ナノディスクの数密度が低い状態において吸収スペクトル、および近接場スペクトルが飽和する現象を解明するため、単一金ナノディスクをナノ共振器に結合させた状態をシミュレーションし、その分裂エネルギーから得られる空間のサイズを求めた。その結果、別途求めた金ナノディスクの消光断面積などと比較して一桁程度大きな値が得られ、この空間に存在する金ナノディスクが共振器と空間的にコヒーレントに結合するコヒーレンスエリアとなっていると推論している。さらに、フェムト秒過渡吸収測定から結合強度を増強させると、非強結合電極では見られない金から酸化チタンへの電子注入が増強されることを実験的に検証した。
  また、金－銀合金ナノ粒子を用いてナノ共振器と結合させたところ結合強度が金の場合に比べて2倍程度増強し、「超強結合」となることを明らかにした。さらに、本超強結合電極を用いて水を電子源とする光電流を測定したところ、金と比べて2倍程度増強されること、またフェムト秒過渡吸収より金から酸化チタンへの電子注入が増強していることを明らかにした。
  さらに、強結合電極の最適化を図るため、水の酸化反応の助触媒としてコバルト酸化物を金ナノ粒子の近傍に空間選択的に形成させ、反応効率を2倍以上増強することに成功した。また、キノコ型の金ナノ粒子を用いて近接場の空間制御を行い、反応効率を30%増強することにも成功した。
  Japan Society for the Promotion of Science, Grant-in-Aid for Specially Promoted Research, Hokkaido University, 18H05205
• Defect-free, Highly-luminescent and Non-blinking Perovskite Nanocrystals
  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
  Apr. 2019 - Mar. 2023
  Biju V・Pillai
  The research focused on defect passivation of lead halide perovskite nanocrystals (PNCs), quantum dots (PQDs), and microcrystals (PMCs), to develop defect-free LHPs. In this project, cesium (Cs)-, formamidinium (FA)-, and methylammonium (MA) lead bromide and iodide PNCs, PQDs, and PMCs with the visible-to-near infrared emission were synthesized by solution processing (colloidal synthesis), laser trapping (spatiotemporally controlled synthesis), or inverse temperature crystallization. The as-synthesized PNCs, PQDs, and PMCs showed short photoluminescence (PL) lifetimes, low PL intensities, and intense PL blinking. These poor characteristics are attributed mainly to ionic defects, forming deep traps in the bandgap and promoting nonradiative exciton recombination. Thus, this research focussed on the halide defect filling in PNCs, PQDs, and PMCs. Halide defect filling was carried out in single PNCs, single PQDs, and single PMCs by observing the PL lifetime, PL intensity, and PL blinking in real-time. The defect filling in single PNCs and PQDs provided PL quantum efficiency as high as 96% with near-complete blinking suppression. The defect filling in PMCs increased the PL lifetime and intensity, which further helped engineer the bandgap in perovskites. Thus, this research progressed to the realization of defect filling in halide perovskites and achievement of perovskite NCs, PQDs, and PMCs with longer PL lifetimes and higher PL intensities, or better quantum efficiencies than the as-synthesized halide perovskites.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 19H02550
• One and multiple photon induced generation and stabilization of multi-excitons in quantum dot superlattices
  新学術領域研究 研究領域提案型
  Apr. 2017 - Mar. 2019
  BIJU Vasudevan Pillai
  This project accomplished two key goals: (1) controlled the photoluminescence blinking of quantum dots (CdSe-ZnS QDs) by the scavenging of deep holes generated in highly-excited QDs, which was by electron transfer beyond the limitations of Marcus Theory, and (2) generated and stablished multiple charge carriers in lead halide perovskite nanocrystals (PNCs), which was by the preparation of superlattices of PNCs. The above two results became possible by controlling the numbers of excitation photons, excitons generated and photoactivated nanocrystals. Blinking suppression in a QD and stabilization of charge carriers in PNC superlattices were accomplished by exceeding the conventional 1 photon: 1 exciton: 1 chromophore relation.
  The above results were beyond the proposed goals, demonstrating (i) real-time blinking suppression in CdSe-ZnS QDs exposed to N,N-dimethylaniline (DMA), which was by electron transfer under a large positive Gibbs (free) energy change (ACS Nano 2018, 12, 9060) -beyond the expectations of Marcus theory. Furthermore, the blinking suppression was helpful for understanding and overcoming oxidation of PNCs (Angew. Chem. Int. Ed. 2019, 58, 4875). Also, this project accomplished optically-controlled amplified emission from PNC superlattices. Interestingly, under low-intensity excitation, a PNC superlattice showed unusually delayed emission (Angew. Chem. Int. Ed. 2017, 56, 1214), which became extremely fast and spatially confined at higher excitation intensities (ACS Energy Lett. 2018, 4, 133).
  JSPS 新学術領域研究 (Photosynergetics), 新学術領域研究(研究領域提案型), 北海道大学, Competitive research funding, 17H05243
• Efficient utilization of the excitation energy of highly-excited quantum dots for photoreactions
  新学術領域研究 研究領域提案型
  Apr. 2015 - Mar. 2017
  BIJU Vasudevan Pillai
  Aim of this project was to develop methods for efficient utilization of the energy of highly-excited nanoparticles (NPs) such as quantum dots (QDs) and perovskite nanocrystals (PNCs). Highly-excited NPs were generated by high-intensity laser irradiation. However, energy of such NPs is lost by ultrafast radiative and non-radiative recombination of photo-generated charge carriers. Therefore, extraction of absorbed energy towards practical applications is an important challenge. Here we developed photochemical and photophysical methods for extracting the energy of such NPs. At first, a part of the energy absorbed by QDs was extracted by activation of oxygen into singlet oxygen, which was followed by using singlet oxygen as the secondary energy source for chemical reactions. Here, we developed and used two novel singlet oxygen scavengers. Next, we applied highly-excited QDs to DNA molecules, which resulted in electron transfer from DNA to ionized QDs and formation of QD-DNA conjugates. Finally, we investigated stability of photo-generated charge carriers in highly-excited PNCs by preparation of self-assembled PNC structures. When compared with a PNC isolated in a solution, prolonged stability for photo-generated charge carriers was found for self-assembled structures, which is attributed to trapping or hopping of electrons and holes in or among PNCs. Successively, charge carriers in such PNCs were efficiently extracted by employing electron acceptors such as fullerene, which opens a method for efficient utilization of photoactivated PNCs for solar energy harvesting.
  JSPS 新学術領域研究 (Photosynergetics), 新学術領域研究(研究領域提案型), Competitive research funding, 15H01099
• Investigation of the molecular mechanism underlying the dimerization, clustering and intracellular delivery of epidermal growth factor receptor in living cells.
  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
  01 Apr. 2012 - 31 Mar. 2015
  BIJU Vasudevan Pillai
  In this project, the kinetics of EGFR dimerization and clustering were investigated as functions of time- and intensity- gated fluorescence imaging of single-molecules in individual cells. Initially, EGF-EGFR-EGFR (heterodimer) and signaling dimer (EGF-EGFR)2 were equally and uniformly present in cells. With time, signaling dimers dominated, which suggests the formation of signaling dimers at the cost of heterodimers. Also, small clusters of EGFR were appeared at ca 15 min, which grew in both number and size before endocytosis. These results suggests that uncontrolled signaling by EGFR can be suppressed by the suppression of disproportionation of heterodimers into signaling dimers.
  Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), National Institute of Advanced Industrial Science and Technology, 24750029
• Photouncaging fluorescent-magnetic nanoparticles for bimodal imaging and phototherapy of cancer
  Oct. 2010 - Mar. 2014
  JST, Principal investigator
• 細胞機能を可視化する新奇な超分子ナノ材料の光創製
  科学研究費助成事業 特別研究員奨励費
  2011 - 2013
  BIJU VasudevanPillai; SHIBU Edakkattuparambil
  Our aim of this proposal is to develop a novel low-toxic, chemically stable, and highly-luminescent nanoparticles for single-molecule bio-sensing and -imaging using light as a resourceful tool. In this project, two types of novel fluorescent nanomaterials are prepared, which are fullerene-shelled CdSe-ZnS quantum dots and gold quantum clusters (Au25). Here, fullerene-shelled quantum dots are prepared by a photochemical method ; whereas, the quantum clusters are prepared by the alkaline reduction of gold ions within the pockets of bovine serum albumin. At first, a fullerene thiol molecule was synthesized by multi-step thermal chemical route. Subsequently, a monolayer of fullerene is prepared on the surface of QD by the tethering of the fullerene thiol to the ZnS surface through the S-S bonding. Finally, the fullerene thiol monolayer-protected QDs were immersed in excess fullerene thiol and photoactivated. We found the formation stable and thick fullerene shells on the surface of QDs, which is due to the 2+2 photocycloaddition reaction. Further, we characterized their photoluminescence properties at ensemble and single-molecule levels. The most interesting property of the fullerene-shelled QD is its ability to show suppressed blinking. While fullerene-shelled quantum dots show blinking suppression that is suitable for single-molecule bioimaging and solar energy harvesting ; bioconjugates of Au25 efficiently entered human cells and enabled us for obtaining NIR fluorescence images of live cells. The two types of fluorescent nanomaterials enabled us for establishing collaborations with four research groups in Japan. A part of this research is published in ACS Nano 6, 1601-1608, 2012.
  日本学術振興会, 特別研究員奨励費, 独立行政法人産業技術総合研究所, 11F01504
• 発光性半導体ナノ結晶の点滅現象制御に関する研究
  科学研究費助成事業 特定領域研究
  2005 - 2006
  石川 満; BIJU Vasudevan Pillai
  孤立した1個の発光性量子ドットは、本質的に備えている断続的な発光の点滅現象を示すことが知られている。これは望ましくない特性なので、非点滅性の量子ドットは、時間に依存する生物的動的過程を連続的に研究する目的では要求が高い特性のひとつである。我々は単一量子ドットの点滅現象の制御に興味があり、量子ドット合成の反応温度や溶媒の種類と組成をパラメータとし、またカーボンナノチューブ、ポリマー、および金属あるいは半導体のナノ粒子を用いて、量子ドット表面を修飾した。本研究の重要な目的のひとつは、点滅を完全に抑制することである。表面の修飾により、量子ドットの発光特性が強く影響されること、そして、しばしば強く消光を起こすことを見出した。現時点で、CdSe量子ドットについて点滅の完全な抑制を達成していないものの、反応条件の制御および表面の装飾によって、下記のような重要な知見を得た。
  白色発光を示すCdSe量子ドットが有機金属化合物のコロイド成長反応を用いて室温(23℃)で合成された。これらの量子ドットは粒径分布が均一にもかかわらず、発光スペクトルの半値幅が150nmと広いことが特異的である。再現性の高い発光量子収率として0.4が得られた。さらに、mercaptosuccinic酸を用いて、この量子ドットの表面を修飾して可水溶化することも可能であった。
  量子ドットを用いたナノデバイスの開発では、種々の光および電子材料に量子ドットを制御して共役化させることが必要である。このような観点から、量子ドットを規則的に配置するための方法および量子ドットと共役化させた分子アセンブリの特性を評価することは重要である。本研究では、側壁を官能基で修飾した単層カーボンナノチューブにCdSe-ZnS量子ドットを共役化させ、それが量子ドットの発光特性に及ぼす影響を調べた。
  日本学術振興会, 特定領域研究, 独立行政法人産業技術総合研究所, 17034068