Dr. Takuya OKAMOTO

E-mail: okamotot@es.*** Tel: ###-9416   Fax: ###-9407

*** = hokudai.ac.jp

### = +81-11-706 for international,  011-706 for domestic

Expertise:

Laser, Photochemistry, Physical chemistry, Nanomaterials, Perovskites

Main research topics:

・Photochemical halide composition control and optical property improvements of halide perovskite materials

・Lasing and amplified spontaneous emission of semiconductor materials

・Fabrication of halide perovskite nanocrystal, microcrystal, and superlattice

Career:

Apr. 2020 to present, JSPS Postdoctoral Fellow

Laboratory of Molecular Photonics, Division of Material and Molecular Sciences,
Research Institute for Electronic Science,  Hokkaido University, Japan

Education:

Apr. 2017 to Mar. 2020, Ph.D. (Science), Osaka City University, Japan

Apr. 2015 to Mar. 2017, M. Sc., Osaka City University, Japan

Apr. 2011 to Mar. 2015, B. Sc., Osaka City University, Japan

Tomoyuki Yatsuhashi Group, Department of Chemistry, Graduate School of Science, Osaka City University, Japan (http://www.sci.osaka-cu.ac.jp/chem/laser/laser.html)

Work Experiences:

Apr. 2020 to present, Japan Society for the Promotion of Science Research Fellowship for Young Scientists PD

Apr. 2018 to Mar. 2020, Japan Society for the Promotion of Science Research Fellowship for Young Scientists DC2

Apr. 2017 to Mar. 2019, Part-Time Lecturer, Osaka Prefecture University College of Technology

Honors & Awards:

Dec. 2020, The 37th Inoue Research Award for Young Scientists

Apr. 2020, The 2nd Materials and Devices Joint Research Award

Dec. 2019, Poster presentation award at the 19th Tohoku University Institute of Multidisciplinary Research for Advanced Materials Symposium “Synthesis of gold nanoparticles by femtosecond laser irradiation: particles size and dispersion control by using the microdroplet surface”

Mar. 2017, Osaka City University distinguished student award (Wakano Award).

Sep. 2015, Poster presentation award at Annual meeting on Photochemistry 2015 “Synthesis of Hydrophilic Carbon Nanoparticles from Aqueous Benzene by Laser-induced Plasma”

Feb. 2015, BCSJ (The Bulletin of the Chemical Society of Japan) award “Synthesis of hydrophilic and hydrophobic carbon nanoparticles from benzene/water bilayer solution with femtosecond laser generated plasma filaments in water”

Research Publications:

1) Original paper

(After joining Biju group)

・Takuya Okamoto, Md Shahjahan, Vasudevanpillai Biju, “Shape-dependent Kinetics of Halide Vacancy Filling in Organolead Halide Perovskites”, Adv. Opt. Mater. in press.

・Md Shahjahan, Ken-ichi Yuyama, Takuya Okamoto, Vasudevanpillai Biju, “Heterojunction Perovskite Microrods Prepared by Remote-Controlled Vacancy Filling and Halide Exchange” Adv. Mater. Technol. 6, 2000934, 2021.

(before joining Biju group in 2020)

・Takuya Okamoto, Takahiro Nakamura, Yuhei O. Tahara, Makoto Miyata, Kenji Sakota, Tomoyuki Yatsuhashi, “Effects of Ligand and Solvent on the Synthesis of Iron Oxide Nanoparticles from Fe(acac)3 Solution by Femtosecond Laser Irradiation”, Chem. Lett. 49 (1), pp. 75–78, 2020.

・Yuki Horikawa, Takuya Okamoto, Takahiro Nakamura, Yuhei O. Tahara, Makoto Miyata, Shingo Ikeda, Kenji Sakota, Tomoyuki Yatsuhashi, “Synthesis of iron-based nanoparticles from ferrocene by femtosecond laser irradiation: Suppression of the particle growth in a mixture of water and hexane” Chem. Phys. Lett. 2020, 750, 137504.

・Takuya Okamoto, Takahiro Nakamura, Kenji Sakota, Tomoyuki Yatsuhashi, “Synthesis of Single-Nanometer-Sized Gold Nanoparticles in Liquid–Liquid Dispersion System by Femtosecond Laser Irradiation”, Langmuir 35 (37), pp. 12123–12129, 2019.

・Takuya Okamoto, Takahiro Nakamura, Ryo Kihara, Tsuyoshi Asahi, Kenji Sakota, Tomoyuki Yatsuhashi, “Synthesis of Bare Iron Nanoparticles from Ferrocene Hexane Solution by Femtosecond Laser Pulses”, ChemPhysChem 19 (19), pp. 2480–2485, 2018.

・Takuya Okamoto, Koji Mitamura, Tomoyuki Hamaguchi, Kimihiro Matsukawa, Tomoyuki Yatsuhashi, “Synthesis of Fluorine-Doped Hydrophilic Carbon Nanoparticles from Hexafluorobenzene by Femtosecond Laser Pulses”, ChemPhysChem 18 (9), pp. 1007–1011, 2017.

・Takuya Okamoto, Erina Miyasaka, Koji Mitamura, Kimihiro Matsukawa, Tomoyuki Yatsuhashi, “Precipitation of dichloromethane as low-chlorine carbon nanoparticles from water by femtosecond laser pulses”, J. Photochem. Photobiol. A 344, pp. 178–183, 2017.

・Tomoyuki Hamaguchi, Takuya Okamoto, Koji Mitamura, Kimihiro Matsukawa, Tomoyuki Yatsuhashi, “Synthesis of Hydrophilic and Hydrophobic Carbon Nanoparticles from Benzene/Water Bilayer Solution with Femtosecond Laser Generated Plasma Filaments in Water”, Bull. Chem. Soc. Jpn. 88 (2), pp. 251–261, 2015.

2) Review

・Takuya Okamoto, Nobuyuki Nakashima, Tomoyuki Yatsuhashi, “Chemical reactions in liquid-phase and nanomaterials synthesis by femtosecond laser pulses (in Japanese)”, Rev. Laser Eng. 45 (5), 278-282, 2017.

Societies:

・The Japanese Photochemistry Association

・The Chemical Society of Japan