Martin VACHA

Profile Information

Affiliation: Professor, School of Materials and Chemical Technology, Institute of Science Tokyo

Degree: Doctor of Science

J-GLOBAL ID: 200901062183951215
researchmap Member ID: 5000094690

External link: http://www.op.titech.ac.jp/lab/vacha/index.html

Research Interests

Research Areas

Nanotechnology/Materials / Organic functional materials /

Education

- 1991

Department of Chemical Physics, Faculty of Mathematics and Physics,, Charles University, Prague,
- 1991

Department of Chemical Physics, Faculty of Mathematics and Physics,, Charles University, Prague,

Committee Memberships

Jan, 2012 - Present

NPG Asia Materials Editorial Board, Nature Publishing Group

Awards

2020

The Award of the Society of Polymer Science, Japan, The Society of Polymer Science, Japan

Papers

171

Spectrally Selective Leakage of Light from Self-Assembled Supramolecular Nanofiber Waveguides Induced by Surface Plasmon Polaritons

Qiwen Tan, Nao Koishihara, Shun Omagari, Takehiro Hirao, Takeharu Haino, Martin Vacha

The Journal of Physical Chemistry C, 128(10) 4295-4302, Mar 5, 2024
Impact of Ring-Closing on the Photophysical Properties of One-Dimensional π-Conjugated Molecular Aggregate

Sho Takahashi, Takuma Matsumoto, Martin J. Hollamby, Hiroshi Miyasaka, Martin Vacha, Hikaru Sotome, Shiki Yagai

Journal of the American Chemical Society, Jan 1, 2024
Simultaneous Force and Fluorescence Spectroscopy on Single Chains of Polyfluorene: Effect of Intra-Chain Aggregate Coupling

Tomonori Nakamura, Shun Omagari, Xiaobin Liang, Qiwen Tan, Ken Nakajima, Martin Vacha

ACS Nano, 17(9) 8074-8082, Apr 25, 2023 Corresponding author
Suppression of blinking in single CsPbBr₃ perovskite nanocrystals through surface ligand exchange

Toranosuke Takagi, Shun Omagari, Martin Vacha

Physical Chemistry Chemical Physics, 25(28) 19004-19012, 2023 Corresponding author
Air-stable mixed cation lead halide perovskite films and microscopic study of their degradation process

Anubha Agarwal, Shun Omagari, Martin Vacha

Nanoscale, 15(25) 10642-10650, 2023 Corresponding author
Nanoscale Structural Heterogeneity and Efficient Intergrain Charge Diffusion in a Series of Mixed MA/FA Halide Perovskite Films

Anubha Agarwal, Shun Omagari, Martin Vacha

ACS Energy Letters, 7(8) 2443-2449, Aug 12, 2022 Corresponding author
Dynamic molecular conformational change leading to energy transfer in F8-5% BSP copolymer revealed by single-molecule spectroscopy

Hao Yan, Tzu-Wei Tseng, Shun Omagari, Iain Hamilton, Tomonori Nakamura, Martin Vacha, Ji-Seon Kim

The Journal of Chemical Physics, 156(7) 074704-074704, Feb 21, 2022 Corresponding author
Real-time molecular-level visualization of mass flow during patterned photopolymerization of liquid-crystalline monomers

Keisuke Ueda, Miho Aizawa, Atsushi Shishido, Martin Vacha

NPG Asia Materials, 13(1), Dec, 2021 Corresponding author
Dynamic Polymer Free Volume Monitored by Single-Molecule Spectroscopy of a Dual Fluorescent Flapping Dopant

Yuma Goto, Shun Omagari, Ryuma Sato, Takuya Yamakado, Ryo Achiwa, Nilanjan Dey, Kensuke Suga, Martin Vacha, Shohei Saito

Journal of the American Chemical Society, Aug 27, 2021 Corresponding author
Enhancement of the Photocurrent of a Single Photosystem I Complex by the Localized Plasmon of a Gold Nanorod

Ryotaro Furuya, Shun Omagari, Qiwen Tan, Heiko Lokstein, Martin Vacha

Journal of the American Chemical Society, 143(33) 13167-13174, Aug 25, 2021 Corresponding author
Real-Time Monitoring of Formation and Dynamics of Intra- and Interchain Phases in Single Molecules of Polyfluorene

Tzu-Wei Tseng, Hao Yan, Tomonori Nakamura, Shun Omagari, Ji-Seon Kim, Martin Vacha

ACS Nano, 14(11) 16096-16104, Oct 21, 2020 Corresponding author
Energy localization vs. charge funneling in aggregates of CsPbBr3 perovskite nanocrystals

Dharmendar Kumar Sharma, Shuzo Hirata, Martin Vacha

Journal of Luminescence, 222 117119-117119, Jun, 2020 Corresponding author
Mechanically Induced Conformation Change, Fluorescence Modulation, and Mechanically Assisted Photodegradation in Single Nanoparticles of the Conjugated Polymer Poly(9,9-dioctylfluorene)

Tomonori Nakamura, Martin Vacha

The Journal of Physical Chemistry Letters, 11(8) 3103-3110, Apr 16, 2020 Corresponding author
Ageing of Polymer Frictional Interfaces: The Role of Quantity and Quality of Contact

D. Petrova, D. K. Sharma, M. Vacha, D. Bonn, A. M. Brouwer, B. Weber

ACS Applied Materials & Interfaces, 12(8) 9890-9895, Feb 26, 2020
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, 2020
Toward accurate measurement of the intrinsic quantum yield of lanthanide complexes with back energy transfer

Shun Omagari, Martin Vacha

Physical Chemistry Chemical Physics, 22(6) 3683-3690, 2020
Single-particle electroluminescence of CsPbBr3 perovskite nanocrystals reveals particle-selective recombination and blinking as key efficiency factors

Dharmendar Kumar Sharma, Shuzo Hirata, Martin Vacha

Nature Communications, 10(1), Dec, 2019 Corresponding author
Suppressed Triplet Exciton Diffusion Due to Small Orbital Overlap as a Key Design Factor for Ultralong-Lived Room-Temperature Phosphorescence in Molecular Crystals

Kaishi Narushima, Yasuhiro Kiyota, Takehiko Mori, Shuzo Hirata, Martin Vacha

Advanced Materials, 31(10) 1807268-1807268, Mar, 2019 Corresponding author
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 22, 2019 Corresponding author
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, 2019

Misc.

Untitled (vol 7, e160, 2015)

Martin Vacha, Lei Jiang

NPG ASIA MATERIALS, 7, Apr, 2015
NPG Asia Materials celebrates a year of publishing original research

Martin Vacha, Hee Cheul Choi, Shutao Wang, Ikuyoshi Tomita, Tomoyasu Taniyama

NPG ASIA MATERIALS, 5 e34, Jan, 2013 Peer-reviewed
Structural Conformation and Photophysical Properties of Conjugated Polymer Molecules

HABUCHI Satoshi, VACHA Martin

60(2) 58-61, Feb 1, 2011
Investigation of Quenching Mechanism in Thermoreversible Fluorescent Recording Materials of Fluorescence Using Thermochromic Fluorescence Resonance Energy Transfer.

Shuzo Hirata, Martin Vacha, Toshiyuki Watanabe

Jpn. J. Appl. Phys., 49 052501, 2010
Super-resolution via iterative phase retrieval for blurred and saturated biological images

Eran Gur, Vassilios Sarafis, Igor Falat, Frantisek Vacha, Martin Vacha, Zeev Zalevsky

OPTICS EXPRESS, 16(11) 7894-7903, May, 2008
Synthesis and characterization of a novel electroluminescent polymer based on a phenoxazine derivative

Yuichi Ito, Takahiro Shimada, Jaekook Ha, Martin Vacha, Hisaya Sato

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, 44(14) 4338-4345, Jul, 2006
Local reflection micro-spectroscopy of excitons in fibril-shaped molecular J-aggregates prepared in PVA thin films

T Tani, Y Yamaguchi, M Saeki, M Oda, M Vacha

JOURNAL OF LUMINESCENCE, 102 27-33, May, 2003
Micro-spectroscopy of individual nanostructures of molecular aggregates: relationship between morphology and optical properties

M Vacha, M Saeki, K Hashizume, T Tani

CHEMICAL PHYSICS, 285(1) 149-155, Dec, 2002
Individual mesoscopic structures studied with sub-micrometer optical detection techniques: CdSe nanocrystals capped with TOPO and ZnS-overcoated system

K Hashizume, M Matsubayashi, M Vacha, T Tani

JOURNAL OF LUMINESCENCE, 98(1-4) 49-56, Jul, 2002
Optical properties of individual nanostructures of molecular J-aggregates

M Vacha, M Saeki, M Furuki, LS Pu, K Hashizume, T Tani

JOURNAL OF LUMINESCENCE, 98(1-4) 35-40, Jul, 2002
Reflection microspectroscopy of fiber-like structures of molecular J-aggregates

Saeki M., Yamaguchi Y., Matsumoto H., Vacha M., Hasizume K., Tani T.

Meeting abstracts of the Physical Society of Japan, 56(2) 111-111, Sep 3, 2001
Single molecule optical detection and spectroscopy

TANI Toshiro, VACHA Martin

69(12) 1443-1444, Dec 10, 2000
Onset of exciton-polariton behavior observed in individual fibers of pseudoisocyanine J-aggregates by sub-micron scale reflectance spectroscopy

M Vacha, S Takei, K Hashizume, Y Sakakibara, T Tani

CHEMICAL PHYSICS LETTERS, 331(5-6) 387-395, Dec, 2000
Preparation and optical properties of capped-CdSe nanocrystals

K Hashizume, M Vacha, T Tani

JOURNAL OF LUMINESCENCE, 87-9 402-404, May, 2000
Sub-micron scale spectroscopy localized on individual fibers of molecular J-aggregates of pseudoisocyanine dyes in thin polymer film

M Vacha, K Hashizume, T Tani

JOURNAL OF LUMINESCENCE, 87-9 730-732, May, 2000
Sub-micron scale spectroscopy and microscopy of individual mesoscopic systems at cryogenic temperatures

M Vacha, K Hashizume, T Tani

JOURNAL OF LUMINESCENCE, 86(3-4) 195-200, Apr, 2000
Morphology and sub-micron optical properties of pseudo-1-dimensional molecular aggregates

Takei S., Kikuchi K., Sekizaki M., Vacha M., Hashizume K., Tani T.

Meeting abstracts of the Physical Society of Japan, 55(1) 631-631, Mar 10, 2000
Inner structure of intact chloroplasts observed by a low temperature laser scanning microscope

F Vacha, M Vacha, L Bumba, K Hashizume, T Tani

PHOTOSYNTHETICA, 38(4) 493-496, 2000
Laser scanning gradient index optics microscope: submicrometre scale spectroscopy and imaging at cryogenic temperatures

M Vacha, K Hashizume, T Tani

JOURNAL OF MICROSCOPY-OXFORD, 194 483-485, May, 1999
31a-YH-3 2D scanning microscope for single molecule detection and spectroscopy using gradient index micro-lens

VACHA M., YOKOYAMA H., TANI T.

Meeting abstracts of the Physical Society of Japan, 53(1) 191-191, Mar 10, 1998

Books and Other Publications

Nanoscale Physics for Materials Science

CRC Press (Taylor & Francis), 2009 (ISBN: 9781439800591)

Presentations

キャピラリー電気泳動ドーピング法による色素分子配向性有機・無機ハイブリッド薄膜の作製ーデフォーカスイメージング法によるローダミン６G単一分子蛍光像観察ー

日本セラミックス協会2010年年会, 2010
Relationship between conformation and optical/electrical properties of single conjugated polymer chains: MEH-PPV and polythiophene

10th International Conference on Hole Burning and Single Molecule Spectroscopies, 2009
Single molecule electroluminescence of a phosphorescent organometallic complex

10th International Conference on Hole Burning and Single Molecule Spectroscopies, 2009
Relationship between conformation and photophysical and electrical properties of single conjugated polymer chains

58th Autumn Meeting of the Society of Polymer Science, 2009
Nanoscale heterogeneity and dynamics of organic EL devices: single-molecule study

2009 Annual Meeting on Photochemistry, 2009
Relationship between conformation and optical/electrical properties of single conjugated polymer chains: MEH-PPV and polythiophene

10th International Conference on Hole Burning and Single Molecule Spectroscopies, 2009
Single molecule electroluminescence of a phosphorescent organometallic complex

10th International Conference on Hole Burning and Single Molecule Spectroscopies, 2009
ペリレンジイミド部位を持つ環状および直鎖状ポリテトラヒドロフランの単分子蛍光観察による拡散係数測定

第58回高分子討論会, 2009
Relationship between conformation and photophysical and electrical properties of single conjugated polymer chains

58th Autumn Meeting of the Society of Polymer Science, 2009
Nanoscale heterogeneity and dynamics of organic EL devices: single-molecule study

2009 Annual Meeting on Photochemistry, 2009
Conjugated polymer conformations and related photophysics in thin-film matrices: a single-molecule study

STAC2/STSI1, 2008
Relationship between conformation and photophysics of single conjugated polymer chains

2008
Conformation and photophysics related in single chains of conjugated polymers

3rd International Symposium on Integrated Molecular/Materials Engineering, 2008
Conjugated polymer conformations and related photophysics in thin-film matrices: a single-molecule study

STAC2/STSI1, 2008
Relationship between conformation and photophysics of single conjugated polymer chains

2008
共役系ポリマー単一分子鎖のコンフォメーションと光物理的特性の相関

2008年光化学討論会, 2008
ポリチオフェン単一分子鎖の光物性と構造の関係

2008年光化学討論会, 2008
単一分子分光法によるＴｇ付近におけるポリマー薄膜のナノスケールダイナミクス

2008年光化学討論会, 2008
Ｉｒ錯体の単一分子レベルにおける発光特性解析

2008年光化学討論会, 2008
単一分子分光法による光合成細菌集光アンテナの内部構造についての研究

2008年光化学討論会, 2008

Professional Memberships

Research Projects

Study of electroluminescence and photophysical properties of single halide perovskite nanocrystals

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2019 - Mar, 2024
Electroluminescence of single conjugated polymer chains

Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Exploratory Research, Japan Society for the Promotion of Science, 2011 - 2012

VACHA Martin
Study of relationship between conformation and optical properties of single chains of conjugated polymers

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, 2008 - 2010

VACHA Martin
有機ＥＬ燐光材料の単一分子レベルでの発光研究

科学研究費補助金, 2004 - 2005

Profile Information

Research Interests

Research Areas

Education

Committee Memberships

Awards

Papers

Misc.

Books and Other Publications

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Professional Memberships

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