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片山哲郎

徳島大学

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2024年11月22日更新

職名: 助教
電話: 088-656-7538
電子メール: tetsuro@tokushima-u.ac.jp
学歴: 研究者総覧に該当データはありませんでした。
学位: 博士(理学) (大阪大学) (2010年3月)
職歴・経歴: 2019/7: 徳島大学助教, 大学院社会産業理工学研究部 (-2022.3.)
2022/4: 徳島大学助教, ポストLEDフォトニクス研究所

専門分野・研究分野: 物理化学 (Physical Chemistry)
光化学 (Photochemistry)

研究者総覧で最新データを確認する

2024年11月22日更新

専門分野・研究分野: 物理化学 (Physical Chemistry)
光化学 (Photochemistry)
担当経験のある授業科目: STEM演習 (学部)
デザイン思考演習 (大学院)
レーザー計測 (学部)
光応用工学実験1 (学部)
光応用工学計算機実習 (学部)
分子分光学 (学部)
半導体ナノテクノロジー基礎論 (学部)
基礎光化学 (学部)
応用光化学 (学部)
理工学特別実習 (大学院)
指導経験: 4人 (学士), 3人 (修士)

研究者総覧で最新データを確認する

2024年11月22日更新

専門分野・研究分野: 物理化学 (Physical Chemistry)
光化学 (Photochemistry)

研究テーマ: 反応ダイナミクス測定, 新規顕微分光手法の開発 (光電変換素過程, 超高速分光, マイクロ化学)

著書

橋爪正樹, 右手浩一, 井﨑ゆみ子, 大野将樹, 中野晋, 溝渕啓, 玉谷純二, 下村直行, 上田隆雄, 上野勝利, 長尾文明, 橋本親典, 武藤裕則, 渡邉健, 木戸崇博, 片山哲郎, 山下陽子, 田端厚之, 佐々木由香, 島木美香, 音井威重, 金丸芳, 服部武文, 濵野龍夫, 宮脇克行, 安間了, 西山賢一, 青矢睦月 :
安全マニュアル,
2021年4月. 片山哲郎 :
波長可変な過渡吸収分光を用いた光電変換系における電荷補足サイトおよび光退色過程の解明,
2016年1月. Hiroshi Miyasaka, 片山哲郎 :
光誘起電子移動,
2016年1月. Yukihide Ishibashi, Tetsuro Katayama and Hiroshi Miyasaka :
Ultrafast Dynamics and Mechanisms of One-Photon and Multiphoton Photochromic Reactions,
Jun. 2013.

論文

Masaki Murase, Yuki Matsuoka, Satoshi Sugano, Tetsuro Katayama and Akihiro Furube :
Enhancement of Visible Light Response of TiO2 Photocatalyst by 3D-Deposited Ag Nanowires and Its Charge Separation Mechanism,
The Journal of Chemical Physics, Vol.161, 014701, 2024.

(要約): In 3D-deposited AgNW/TiO2, which is prepared by spray-applying titanium dioxide suspension to deposited silver nanowire sheets, the synergistic effects of increased crossing points of AgNWs to enhance localized surface plasmon resonance excitation and longer-lived electrons in the conduction band of TiO2 generated by plasmon-induced charge transfer have successfully resulted in photocatalytic activity in the visible light range. We have developed photocatalytic sheets in which TiO2 particles are uniformly attached to 3D-deposited AgNWs. Regarding the prepared sheet, it was confirmed that TiO2 was indeed well adhered to the AgNWs, and electron transfer was efficient at the interface. This sheet solves the problem that the response wavelength range of the photocatalytic reaction using TiO2 is only in the ultraviolet region and exhibits sufficient photocatalytic effect in the visible light region. Transient absorption spectroscopy measurements in the diffuse reflectance configuration confirmed that the electrons of AgNWs actually move into the conduction band of TiO2 under visible light and that the interaction is independent of the excitation light intensity, thereby extending the lifetime of the electrons.
(出版サイトへのリンク): ● Publication site (DOI): 10.1063/5.0205194
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 38949283; ● Summary page in Scopus @ Elsevier: 2-s2.0-85197310664

(DOI: 10.1063/5.0205194, PubMed: 38949283, Elsevier: Scopus) Fumitoshi Yagishita, Tetsuro Katayama, Yuta Kawamura, WATANABE Guran, ABE Sota, OGAWA Itsuki, Atsushi Tabata, Yasushi Yoshida, Hyuma Masu, Shoko Ueta, Yukihiro Arakawa, Keiji Minagawa, Akihiro Furube and Yasushi Imada :
Blue Luminescent Boron Complexes Based on N,N-Type Imidazo[1,5-a]pyridine Ligand for Mitochondrial Imaging,
Asian Journal of Organic Chemistry, Vol.13, No.9, e202400189, 2024.

(出版サイトへのリンク): ● Publication site (DOI): 10.1002/ajoc.202400189
(文献検索サイトへのリンク): ● Summary page in Scopus @ Elsevier: 2-s2.0-85199996380

(DOI: 10.1002/ajoc.202400189, Elsevier: Scopus) Sawate Akash, Paul Niloy, Sathe Bhaskar, Tetsuro Katayama, Akihiro Furube and Pankaj Koinkar :
Fabrication of MoO₃/rGO/Au composite for increased photocatalytic degradation of methylene blue,
International Journal of Modern Physics B, Vol.38, No.12-13, 2440010, 2024.

(キーワード): : Hydrothermal method / 複合材料 (composite material) / methylene blue / photocatalysis
(出版サイトへのリンク): ● Publication site (DOI): 10.1142/S0217979224400101
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1142/S0217979224400101

(DOI: 10.1142/S0217979224400101) Du Luchao, An Jie, Tetsuro Katayama, Duan Menghan, Shi XiaoPing, Wang Yunpeng and Akihiro Furube :
Photogenerated Carrier Dynamics of Mn2+ Doped CsPbBr3 Assembled with TiO2 Systems: Effect of Mn Doping Content,
The Journal of Chemical Physics, Vol.160, 164713, 2024.

(要約): In recent years, all-inorganic perovskite materials have become an ideal choice for new thin film solar cells due to their excellent photophysical properties and have become a research hotspot. Studying the ultrafast dynamics of photo-generated carriers is of great significance for further improving the performance of such devices. In this work, we focus on the transient dynamic process of CsPbBr3/TiO2 composite systems with different Mn2+ doping contents using femtosecond transient absorption spectroscopy technology. We used singular value decomposition and global fitting to analyze the transient absorption spectra and obtained three components, which are classified as hot carrier cooling, charge transfer, and charge recombination processes, respectively. We found that the doping concentration of Mn2+ has an impact on all three processes. We think that the following two factors are responsible: one is the density of defect states and the other is the bandgap width of perovskite. As the concentration of doped Mn2+ increases, the charge transfer time constant shows a trend of initially increasing, followed by a subsequent decrease, reaching a turning point. This indicates that an appropriate amount of Mn2+ doping can effectively improve the photoelectric performance of solar cell systems. We proposed a possible charge transfer mechanism model and further elucidated the microscopic mechanism of the effect of Mn2+ doping on the interface charge transfer process of the CsPbBr3/TiO2 solar cell system.
(出版サイトへのリンク): ● Publication site (DOI): 10.1063/5.0197068
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 38656441; ● Summary page in Scopus @ Elsevier: 2-s2.0-85191334468

(DOI: 10.1063/5.0197068, PubMed: 38656441, Elsevier: Scopus) Kai-Siang Lin, Akihiro Furube, Tetsuro Katayama, Pankaj Koinkar and Mou Chang Wu :
Laser ablation synthesis of BiOCl/Ag/WO₃ nanocomposite to evaluate its photocatalysis performance,
Modern Physics Letters. B, 2441007, 2024.

(キーワード): Photocatalysis / Bismuth Oxychloride / ナノ複合体 (nanocomposite) / Laser ablation
(出版サイトへのリンク): ● Publication site (DOI): 10.1142/S0217984924410070
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1142/S0217984924410070

(DOI: 10.1142/S0217984924410070) Akash Sawate, Niloy Paul, Akihiro Furube, Tetsuro Katayama and Pankaj Koinkar :
Improved photocatalytic activities of TiO₂/MoO₃/Au nanocomposite prepared by hydrothermal method,
Modern Physics Letters. B, 2441006, 2024.

(キーワード): Photocatalysis / ナノ複合体 (nanocomposite) / hydrothermal method / methylene blue
(出版サイトへのリンク): ● Publication site (DOI): 10.1142/S0217984924410069
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1142/S0217984924410069

(DOI: 10.1142/S0217984924410069) Vinayak Shinde, Pratiksha Tanwade, Tetsuro Katayama, Akihiro Furube, Bhaskar Sathe and Pankaj Koinkar :
Ternary composite WS2/GO/Au synthesized from laser ablation and hydrothermal method for photo- and electro-chemical degradation of methylene blue dye,
Surfaces and Interfaces, Vol.46, 104067, 2024.

(キーワード): Tungsten disulfide/graphene oxide / Methylene blue / Photo and electro-degradation / Photocatalysis; / Electrocatalysis / Dye degradation
(出版サイトへのリンク): ● Publication site (DOI): 10.1016/j.surfin.2024.104067
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1016/j.surfin.2024.104067

(DOI: 10.1016/j.surfin.2024.104067) Paul Niloy, Sawate Akash, Satoshi Sugano, Tetsuro Katayama, Masatsugu Oishi, Akihiro Furube and Pankaj Koinkar :
Development of silver nanocubes created by pulsed laser ablation in liquid,
International Journal of Modern Physics B, Vol.38, No.12&13, 2440014, 2024.

(出版サイトへのリンク): ● Publication site (DOI): 10.1142/S0217979224400149
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1142/S0217979224400149

(DOI: 10.1142/S0217979224400149) Pankaj Koinkar, Daichi Nakayama, Tetsuro Katayama, Vinayak Shinde, Yasuyuki Maeda, Akihiro Furube, Gebeyehu Motora Kebena and Mou Chang Wu :
Photocatalytic studies of tin oxide nanostructures produced by different methods,
Modern Physics Letters. B, Vol.37, No.16, 2340003, 2023.

(キーワード): Photocatalysis; / tin oxide / Rhodamine B / Laser ablation
(出版サイトへのリンク): ● Publication site (DOI): 10.1142/S0217984923400031
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1142/S0217984923400031

(DOI: 10.1142/S0217984923400031) Vinayak Shinde, Yasuyuki Maeda, Tetsuro Katayama, Akihiro Furube, Taka-aki Yano and Pankaj Koinkar :
Tungsten suboxide (WO3x) petal-like nanosheets created by laser ablation method,
Modern Physics Letters. B, Vol.37, No.16, 2340005, 2023.

(キーワード): Tungsten trioxide / Laser ablation / UV-visible spectroscopy / Energy dispersive spectrometry; / Field emission scanning electron microscopy; / Raman spectroscopy
(出版サイトへのリンク): ● Publication site (DOI): 10.1142/S0217984923400055
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1142/S0217984923400055

(DOI: 10.1142/S0217984923400055) Sunna Jung, Li Wang, Haruki Sugiyama, Hidehiro Uekusa, Tetsuro Katayama, Kenji Kamada, Toshiyuki Hamura and Naoto Tamai :
Intramolecular Singlet Fission in Pentacene Oligomers via an Intermediate State,
The Journal of Physical Chemistry B, Vol.127, No.20, 4554-4561, 2023.

(要約): Intramolecular singlet fission (iSF) is an efficient strategy of multiexciton generation via a singlet exciton splitting into a correlated triplet pair in one organic molecule with more than two chromophores. Propeller-shaped iptycene-linked triisopropylsilyl(TIPS)-ethynyl functionalized pentacene oligomers (pent-monomer, pent-dimer, and pent-trimer) were synthesized, and the iSF dynamics of pent-dimer and -trimer were monitored by a visible-near-IR transient absorption (TA) spectroscopy. Quantum yields of the triplet pair, ∼80%, of both estimated by near-IR TA spectral analysis are in good agreement with the results of global analysis and triplet sensitization experiments. The iSF rate of pent-trimer is slightly faster than that of pent-dimer even with one more chromophore site. The unexpectedly weak difference indicates the existence of an intermediate process to realize iSF. The intermediate process might be determined by through-bond electronic coupling of the homoconjugation bridge in the pentacene oligomers. Our results suggest the importance of the rigid bridge to the fast iSF rate and the elongated lifetime of the correlated triplet pair in pentacene oligomers.
(出版サイトへのリンク): ● Publication site (DOI): 10.1021/acs.jpcb.3c00516
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 37191388; ● Summary page in Scopus @ Elsevier: 2-s2.0-85160211002

(DOI: 10.1021/acs.jpcb.3c00516, PubMed: 37191388, Elsevier: Scopus) Tetsuro Katayama, Shuto Ueda, Yuma Fujita, Yuichiro Akagi, Pankaj Koinkar, Yasufumi Umena and Akihiro Furube :
Observation of energy transfer dynamics in a phycocyanin protein crystal by utilizing femtosecond transient absorption microscopy,
Japanese Journal of Applied Physics, Vol.62, SG1045-1-SG1045-4, 2023.

(出版サイトへのリンク): ● Publication site (DOI): 10.35848/1347-4065/acc3a9
(文献検索サイトへのリンク): ● Summary page in Scopus @ Elsevier: 2-s2.0-85153246617

(DOI: 10.35848/1347-4065/acc3a9, Elsevier: Scopus) Tetsuro Katayama, AKIRA Yamamoto, Yuma Fujita, Yuichiro Akagi, Pankaj Koinkar and Akihiro Furube :
Observation of carrier dynamics in MoS₂ thin layer by femtosecond transient absorption microscopy,
Japanese Journal of Applied Physics, Vol.62, No.SG, SG1029-1-SG1029-3, 2023.

(出版サイトへのリンク): ● Publication site (DOI): 10.35848/1347-4065/acbd57
(文献検索サイトへのリンク): ● Summary page in Scopus @ Elsevier: 2-s2.0-85150838659

(DOI: 10.35848/1347-4065/acbd57, Elsevier: Scopus) Tetsuro Katayama, Yuma Fujita, Yuichiro Akagi, Kangpeng Wang, Raphael Dahan, Tal Fishman, Ido Kaminer, Pankaj Koinkar and Akihiro Furube :
Observation of electronic spectra modulation in a CH₃NH₃PbBr₃ crystal by utilizing transient absorption microscopy,
Japanese Journal of Applied Physics, Vol.62, SG1030-1-SG1030-4, 2023.

(出版サイトへのリンク): ● Publication site (DOI): 10.35848/1347-4065/acbc29
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.35848/1347-4065/acbc29

(DOI: 10.35848/1347-4065/acbc29) Akihiro Furube, Shin-ichiro Yanagiya, Pankaj Koinkar and Tetsuro Katayama :
Basic aspects of gold nanoparticle photo-functionalization using oxides and 2D materials: Control of light confinement, heat-generation, and charge separation in nanospace,
The Journal of Chemical Physics, Vol.157, No.14, 140901, 2022.

(要約): Although the optical properties of localized surface plasmon resonance and the relaxation processes of excited hot electrons in gold nanoparticles (AuNPs) have been well understood, the phenomena that occur when AuNPs relax on solid surfaces of semiconductors or insulators remain largely unknown. Thermal energy diffusion and electron transfer are relatively simple physical processes, but the phenomena they induce are interesting because of a variety of new application developments. In this Perspective, we introduce the fundamental aspects as well as advanced applications of several new physical phenomena induced by AuNPs-based hybrid materials with oxides or 2D materials. Localized heat can induce a great force on the surrounding medium to control mass transport, and plasmon-induced charge transfer reactions are expected to have applications in photocatalysis and solar cells. We also review increasing reports on the development of nano-optical sensors, transistors, and nano-light sources based on precisely controlled device structures utilizing AuNPs.
(出版サイトへのリンク): ● Publication site (DOI): 10.1063/5.0101300
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 36243523; ● Search Scopus @ Elsevier (PMID): 36243523; ● Search Scopus @ Elsevier (DOI): 10.1063/5.0101300

(DOI: 10.1063/5.0101300, PubMed: 36243523) Daichi Nakayama, Pankaj Koinkar, Tetsuro Katayama and Akihiro Furube :
Creation of three dimensional octahedral tin oxide nanostructure produced by laser ablation in liquid,
Modern Physics Letters. B, Vol.36, No.16, 2242002, 2022.

(キーワード): Tin Oxide / Laser ablation / UV-visivle Spectroscopy / Electron Diffraction / Octahedral structure
(出版サイトへのリンク): ● Publication site (DOI): 10.1142/S0217984922420027
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1142/S0217984922420027

(DOI: 10.1142/S0217984922420027) Fumitoshi Yagishita, Keita Hoshi, Shoma Mukai, Takashi Kinouchi, Tetsuro Katayama, Yasushi Yoshida, Keiji Minagawa, Akihiro Furube and Yasushi Imada :
Effect of Phenolic Substituent Position in Boron Complexes of Imidazo[1,5-a]pyridine,
Asian Journal of Organic Chemistry, Vol.11, No.4, e202200040, 2022.

(出版サイトへのリンク): ● Publication site (DOI): 10.1002/ajoc.202200040
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1002/ajoc.202200040

(DOI: 10.1002/ajoc.202200040) Shodai Hasebe, Yuki Hagiwara, Kyoko Takechi, Tetsuro Katayama, Akihiro Furube, Toru Asahi and Hideko Koshima :
Polymorph-Derived Diversification of Crystal Actuation by Photoisomerization and the Photothermal Effect,
Chemistry of Materials, Vol.34, No.3, 1315-1324, 2022.

(出版サイトへのリンク): ● Publication site (DOI): 10.1021/acs.chemmater.1c04007
(文献検索サイトへのリンク): ● Summary page in Scopus @ Elsevier: 2-s2.0-85123589987

(DOI: 10.1021/acs.chemmater.1c04007, Elsevier: Scopus) Keita Hoshi, Masami Itaya, Koki Tahara, Airi Matsumoto, Atsushi Tabata, Hideaki Nagamune, Yasushi Yoshida, Eiji Hase, Takeo Minamikawa, Takeshi Yasui, Tetsuro Katayama, Akihiro Furube, Keiji Minagawa, Yasushi Imada and Fumitoshi Yagishita :
Two-photon excitable boron complex based on tridentate imidazo[1,5-a]pyridine ligand for heavy- atom-free mitochondria-targeted photodynamic therapy,
RSC Advances, Vol.11, 26403-26407, 2021.

(徳島大学機関リポジトリ): ● Metadata: 116625
(出版サイトへのリンク): ● Publication site (DOI): 10.1039/d1ra05059a
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1039/d1ra05059a

(徳島大学機関リポジトリ: 116625, DOI: 10.1039/d1ra05059a) Pankaj Koinkar, Kohei Sasaki, Tetsuro Katayama and Akihiro Furube :
Laser assisted synthesis of WS2 nanorods by pulsed laser ablation in liquid environment,
International Journal of Modern Physics B, Vol.35, No.14-16, 2140007, 2021.

(キーワード): Laser ablation / WS2 nanorods / UV-visible spectra / Raman spectra / Growth mechanism
(出版サイトへのリンク): ● Publication site (DOI): 10.1142/S0217979221400075
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1142/S0217979221400075

(DOI: 10.1142/S0217979221400075) Shodai Hasebe, Yuki Hagiwara, Jun Komiya, Meguya Ryu, Hiroki Fujisawa, Junko Morikawa, Tetsuro Katayama, Daiki Yamanaka, Akihiro Furube, Hiroyasu Sato, Toru Asahi and Hideko Koshima :
Photothermally Driven High-Speed Crystal Actuation and Its Simulation,
Journal of the American Chemical Society, Vol.143, No.23, 8866-8877, 2021.

(要約): Mechanically responsive crystals have been increasingly explored, mainly based on photoisomerization. However, photoisomerization has some disadvantages for crystal actuation, such as a slow actuation speed, no actuation of thick crystals, and a narrow wavelength range. Here we report photothermally driven fast-bending actuation and simulation of a salicylideneaniline derivative crystal with an -amino substituent in enol form. Under ultraviolet (UV) light irradiation, these thin (<20 μm) crystals bent but the thick (>40 μm) crystals did not due to photoisomerization; in contrast, thick crystals bent very quickly (in several milliseconds) due to the photothermal effect, even by visible light. Finally, 500 Hz high-frequency bending was achieved by pulsed UV laser irradiation. The generated photothermal energy was estimated based on the photodynamics using femtosecond transient absorption. Photothermal bending is caused by a nonsteady temperature gradient in the thickness direction due to the heat conduction of photothermal energy generated near the crystal surface. The temperature gradient was calculated based on the one-dimensional nonsteady heat conduction equation to simulate photothermally driven crystal bending successfully. Most crystals that absorb light have their own photothermal effects. It is expected that the creation and design of actuation of almost all crystals will be possible via the photothermal effect, which cannot be realized by photoisomerization, and the potential and versatility of crystals as actuation materials will expand in the near future.
(出版サイトへのリンク): ● Publication site (DOI): 10.1021/jacs.1c03588
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 34096298; ● Search Scopus @ Elsevier (PMID): 34096298; ● Search Scopus @ Elsevier (DOI): 10.1021/jacs.1c03588

(DOI: 10.1021/jacs.1c03588, PubMed: 34096298) Dhongade Siddhant, Pankaj Koinkar, Tetsuro Katayama, More Mahendra, Yutaro Maki and Akihiro Furube :
Charge separation dynamics in In2Se3/ZnO/Au ternary system for enhanced photocatalytic degradation of methylene blue under visible light,
Journal of Photochemistry and Photobiology A: Chemistry, Vol.411, 113208, 2021.

(キーワード): Photocatalyst / Electron transfer / Transient absorption / Indium selenide / Plasmon
(出版サイトへのリンク): ● Publication site (DOI): 10.1016/j.jphotochem.2021.113208
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1016/j.jphotochem.2021.113208

(DOI: 10.1016/j.jphotochem.2021.113208) Eisuke Takeuchi, Masayasu Muramatsu, Yusuke Yoneda, Tetsuro Katayama, Akira Iwamoto, Yutaka Nagasawa and Hiroshi Miyasaka :
Vibrational decoherence induced by ultrafast intramolecular charge separation of an asymmetric bianthryl derivative,
The Journal of Chemical Physics, Vol.153, No.8, 084307, 2020.

(要約): Coherent wavepacket oscillation accompanying the ultrafast photoexcited intramolecular charge separation (CS) of 9,9'-bianthryl (BA) and 10-cyano-9,9'-bianthryl (CBA) in a room temperature ionic liquid, N,N-diethyl-N-methyl-N-(methoxyethyl)ammonium tetrafluoroborate (DemeBF), was investigated by femtosecond time-resolved transient absorption spectroscopy. The frequency of the coherent oscillation observed for CBA in nonpolar n-hexane solution (Hex) was 377 cm, while this oscillation was undetectable in DemeBF. For BA in DemeBF, coherent oscillation with a frequency of 394 cm was observed, which is similar to that for CBA in Hex. CS of CBA occurs in the ultrashort time range of ≤100 fs, while that of BA occurs in a few picosecond range [E. Takeuchi et al., J. Phys. Chem. C 120, 14502-14512 (2016)]. Hence, the oscillation of CBA in Hex and that of BA in DemeBF are assigned to the molecular vibration in the locally excited state, while this oscillation dephases instantaneously for CBA in DemeBF due to the ultrafast CS and no oscillation was generated in the CS state. This result suggests that the CS reaction is not mediated by a specific intramolecular vibration in the CS state but occurs incoherently through higher levels of multiple vibrational modes.
(出版サイトへのリンク): ● Publication site (DOI): 10.1063/5.0018482
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 32872873; ● Search Scopus @ Elsevier (PMID): 32872873; ● Search Scopus @ Elsevier (DOI): 10.1063/5.0018482

(DOI: 10.1063/5.0018482, PubMed: 32872873) Okuhata Tomoki, Tetsuro Katayama and Tamai Naoto :
Ultrafast and Hot Electron Transfer in CdSe QDAu Hybrid Nanostructures,
The Journal of Physical Chemistry C, Vol.124, No.1, 1099-1107, 2020.

(出版サイトへのリンク): ● Publication site (DOI): 10.1021/acs.jpcc.9b09042
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1021/acs.jpcc.9b09042

(DOI: 10.1021/acs.jpcc.9b09042) Yoshinobu Kamakura, Pondchanok Chinapang, Shigeyuki Masaoka, Akinori Saeki, Kazuyoshi Ogasawara, Shigeto R. Nishitani, Hirofumi Yoshikawa, Tetsuro Katayama, Naoto Tamai, Kunihisa Sugimoto and Daisuke Tanaka :
Semiconductive Nature of Lead-Based MetalOrganic Frameworks with Three-Dimensionally Extended Sulfur Secondary Building Units,
Journal of the American Chemical Society, Vol.142, No.1, 27-32, 2020.

(出版サイトへのリンク): ● Publication site (DOI): 10.1021/jacs.9b10436
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1021/jacs.9b10436

(DOI: 10.1021/jacs.9b10436) Li Wang, Kouhei Nonaka, Tomoki Okuhata, Tetsuro Katayama and Naoto Tamai :
Quasi-Type II Carrier Distribution in CdSe/CdS Core/Shell Quantum Dots with Type I Band Alignment,
The Journal of Physical Chemistry C, Vol.122, No.22, 12038-12046, 2018.

(出版サイトへのリンク): ● Publication site (DOI): 10.1021/acs.jpcc.7b11684
(文献検索サイトへのリンク): ● Summary page in Scopus @ Elsevier: 2-s2.0-85046823219

(DOI: 10.1021/acs.jpcc.7b11684, Elsevier: Scopus) Tetsuro Katayama, Harunobu Suenaga, Tomoki Okuhata, Sadahiro Masuo and Naoto Tamai :
Unravelling the Ultrafast Exciton Relaxation and Hidden Energy State In CH₃NH₃PbBr₃ Nanoparticles,
The Journal of Physical Chemistry C, Vol.122, No.22, 5209-5214, 2018.

(出版サイトへのリンク): ● Publication site (DOI): 10.1021/acs.jpcc.8b01051
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1021/acs.jpcc.8b01051

(DOI: 10.1021/acs.jpcc.8b01051) Hikaru Sotome, Tatsuhiro Nagasaka, Kanako Une, Soichiro Morikawa, Tetsuro Katayama, Seiya Kobatake, Masahiro Irie and Hiroshi Miyasaka :
Cycloreversion Reaction of a Diarylethene Derivative at Higher Excited States Attained by Two-Color Two-Photon Femtosecond Pulsed Excitation.,
Journal of the American Chemical Society, Vol.139, No.47, 17159-17167, 2017.

(要約): Two-color, two-pulse femtosecond pulsed excitation was applied to the elucidation of the dynamics and mechanism of cycloreversion reaction of a diarylethene derivative in the higher excited states. Transient absorption spectroscopy under one-photon visible excitation revealed that the 1B state produced by the excitation undergoes the internal conversion into the 2A state with a time constant of 200 fs. Geometrical rearrangement of the 2A state takes place concomitantly with the vibrational cooling with a time constant of 3 ps. The resultant 2A state undergoes the transition into the conical intersection point in competition with nonradiative as well as radiative deactivation into the ground state with a time constant of 12 ps. The second pulse excitation of the 2A state, especially the geometrically relaxed 2A state, led to the significant enhancement of the cycloreversion reaction through the large reaction quantum yield of ca. 50-90% in the higher excited state (S state), while the excitation of the 1B state, leading to the S' state, did not induce such enhancement. By integrating with the excitation wavelength dependence of the second pump laser pulse, we discussed the chemical reactivity of diarylethene derivatives in terms of the symmetry of the electronic states.
(出版サイトへのリンク): ● Publication site (DOI): 10.1021/jacs.7b09763
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 29110473; ● Summary page in Scopus @ Elsevier: 2-s2.0-85035779113

(DOI: 10.1021/jacs.7b09763, PubMed: 29110473, Elsevier: Scopus) Yukihide Ishibashi, Miya Arinishi, Tetsuro Katayama, Hiroshi Miyasaka and Tsuyoshi Asahi :
Femtosecond Excited-State Dynamics of Fullerene-C₆₀ Nanoparticles in Water.,
Physical Chemistry Chemical Physics, Vol.20, No.2, 958-966, 2017.

(要約): Femtosecond excited-state dynamics of fullerene-C nanoparticles (nC) having a mean size of 50 nm dispersed in pure water was studied by means of femtosecond transient absorption spectroscopy. The intermolecular charge-transfer (CT) excited state in solid C was directly and firstly observed by femtosecond 350 nm and 420 nm excitations, and its intrinsic lifetime of 0.35 ps was found. The CT excited state relaxed to the locally excited S state and excimers or directly to the ground state through geminate charge recombination. We also examined the laser fluence dependence of the CT excited-state dynamics. At a high laser fluence, the mutual interactions between neighboring CT excited states were observed immediately after the excitation. The interaction disappeared through the charge recombination in the geminate CT pair or between the neighboring CT excited states with a lifetime of 0.45 ps. After that, the locally excited S state decayed with a few ps lifetime independent of the fluence. In this paper, the mechanism and dynamics of the intermolecular CT excited state generated by UV light excitation is discussed in detail.
(出版サイトへのリンク): ● Publication site (DOI): 10.1039/c7cp06746a
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 29231940; ● Summary page in Scopus @ Elsevier: 2-s2.0-85040164210

(DOI: 10.1039/c7cp06746a, PubMed: 29231940, Elsevier: Scopus) Shinya Tajima, Yoshiki Kuroshima, Tetsuro Katayama, Naoto Tamai, Kazuki Sada and Kenji Hirai :
Solid-Solution Coordination Polymers as Precursors for Zn_xCd_1-xS/C Composite Nanowires.,
European Journal of Inorganic Chemistry, Vol.2017, No.18, 2444-2449, 2017.

(出版サイトへのリンク): ● Publication site (DOI): 10.1002/ejic.201700289
(文献検索サイトへのリンク): ● Summary page in Scopus @ Elsevier: 2-s2.0-85019197166

(DOI: 10.1002/ejic.201700289, Elsevier: Scopus) Yusuke Yoneda, Tetsuro Katayama, Yutaka Nagasawa, Hiroshi Miyasaka and Yasufumi Umena :
Dynamics of Excitation Energy Transfer Between the Subunits of Photosystem II Dimer.,
Journal of the American Chemical Society, Vol.138, No.36, 11599-11605, 2016.

(要約): Energy transfer dynamics in monomer and dimer of the photosystem II core complex (PSII-CC) was investigated by means of femtosecond transient absorption (TA) spectroscopy. There is no profound difference between the TA dynamics of the monomer and the dimer in the weak excitation intensity condition (≤21 nJ). However, the fast recovery of the ground state bleach was pronounced at higher excitation intensities, and the excitation intensity dependence of the dimer was more significant than that of the monomer. This result indicates efficient exciton-exciton annihilation taking place in the dimer due to energy transfer between the two monomer units. The annihilation dynamics was reproduced by a simple model based on binomial theorem, which indicated that although PSII-CC dimer has two reaction centers, only one charge-separated state remained after annihilation.
(出版サイトへのリンク): ● Publication site (DOI): 10.1021/jacs.6b04316
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 27541744; ● Search Scopus @ Elsevier (PMID): 27541744; ● Search Scopus @ Elsevier (DOI): 10.1021/jacs.6b04316

(DOI: 10.1021/jacs.6b04316, PubMed: 27541744) Eisuke Takeuchi, Masayasu Muramatsu, Tetsuro Katayama, Yusuke Yoneda, Syoji Ito, Yutaka Nagasawa and Hiroshi Miyasaka :
Sub-100 fs Charge Separation and Subsequent Diffusive Solvation Observed for Asymmetric Bianthyril Derivative in Ionic Liquid,
The Journal of Physical Chemistry C, Vol.120, No.27, 14502-14512, 2016.

(出版サイトへのリンク): ● Publication site (DOI): 10.1021/acs.jpcc.6b03593
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1021/acs.jpcc.6b03593

(DOI: 10.1021/acs.jpcc.6b03593) Yoichi Kobayashi, Tetsuro Katayama, Takuya Yamane, Kenji Setoura, Syoji Ito, Hiroshi Miyasaka and Jiro Abe :
Stepwise Two-Photon-Induced Fast Photoswitching via Electron Transfer in Higher Excited States of Photochromic Imidazole Dimer.,
Journal of the American Chemical Society, Vol.138, No.18, 5930-5938, 2016.

(要約): Stepwise two-photon excitations have been attracting much interest because of their much lower power thresholds compared with simultaneous two-photon processes and because some stepwise two-photon processes can be initiated by a weak incoherent excitation light source. Here we apply stepwise two-photon optical processes to the photochromic bridged imidazole dimer, whose solution instantly changes color upon UV irradiation and quickly reverts to the initial color thermally at room temperature. We synthesized a zinc tetraphenylporphyrin (ZnTPP)-substituted bridged imidazole dimer, and wide ranges of time-resolved spectroscopic studies revealed that a ZnTPP-linked bridged imidazole dimer shows efficient visible stepwise two-photon-induced photochromic reactions upon excitation at the porphyrin moiety. The fast photoswitching property combined with stepwise two-photon processes is important not only for the potential for novel photochromic materials that are sensitive to the incident light intensity but also for fundamental photochemistry using higher excited states.
(出版サイトへのリンク): ● Publication site (DOI): 10.1021/jacs.6b01470
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 27088169; ● Search Scopus @ Elsevier (PMID): 27088169; ● Search Scopus @ Elsevier (DOI): 10.1021/jacs.6b01470

(DOI: 10.1021/jacs.6b01470, PubMed: 27088169) Shuichi Hashimoto, Tetsuro Katayama, Kenji Setoura, Takayuki Uwada and Hiroshi Miyasaka :
Laser-driven phase transitions in aqueous colloidal gold nanoparticles under high pressure: Picosecond pump-probe study,
Physical Chemistry Chemical Physics, Vol.18, No.6, 4994-5004, 2016.

(要約): Pump-probe transient extinction spectroscopy was applied to analyze 355-nm picosecond laser heating-induced phenomena of 60-nm-diameter aqueous gold nanoparticles (AuNPs) under a high pressure of 60 MPa. Kinetic spectroscopy revealed that a supercritical layer surrounding the AuNP nucleated with a lifetime of approximately 1 ns in its dynamic expansion and decay behavior for a fluence of 19.6 mJ cm 2. Moreover, we observed in the post-mortem transmission electron micrographs a number of fragments, a small percentage of size-reduced cores, and erupted particles, among the intact particles after 60 shots, suggesting that evaporation occurs under laser illumination. The particle temperature calculation indicated that evaporation begins with a liquid droplet AuNP surrounded by a supercritical layer at temperatures below the boiling point of gold. By applying high pressure, we are able to obtain a clear picture of the evaporation event, which was not possible at ambient pressure because the forming bubble caused particle temperatures to rise uncontrollably. In this study, we shed light on the critical role of the supercritical layer formed around the AuNP under high pressure during laser-induced evaporation.
(徳島大学機関リポジトリ): ● Metadata: 114004
(出版サイトへのリンク): ● Publication site (DOI): 10.1039/C5CP07395B
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 26812175; ● Search Scopus @ Elsevier (PMID): 26812175; ● Search Scopus @ Elsevier (DOI): 10.1039/C5CP07395B

(徳島大学機関リポジトリ: 114004, DOI: 10.1039/C5CP07395B, PubMed: 26812175) Yukihide Ishibashi, Toshiyuki Umesato, Mika Fujiwara, Kanako Une, Yusuke Yoneda, Hikaru Sotome, Tetsuro Katayama, Seiya Kobatake, Tsuyoshi Asahi, Masahiro Irie and Hiroshi Miyasaka :
Solvent Polarity Dependence of Photochromic Reactions of a Diarylethene Derivative as Revealed by Steady-State and Transient Spectroscopies.,
The Journal of Physical Chemistry C, Vol.120, No.2, 1170-1177, 2015.

(出版サイトへのリンク): ● Publication site (DOI): 10.1021/acs.jpcc.5b08504
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1021/acs.jpcc.5b08504

(DOI: 10.1021/acs.jpcc.5b08504) Yusuke Yoneda, Tomoyasu Noji, Tetsuro Katayama, Naoto Mizutani, Daisuke Komori, Mamoru Nango, Hiroshi Miyasaka, Shigeru Itoh, Yutaka Nagasawa and Takehisa Dewa :
Extension of Light-Harvesting Ability of Photosynthetic Light-Harvesting Complex 2 (LH2) through Ultrafast Energy Transfer from Covalently Attached Artificial Chromophores.,
Journal of the American Chemical Society, Vol.137, No.40, 13121-13129, 2015.

(要約): Introducing appropriate artificial components into natural biological systems could enrich the original functionality. To expand the available wavelength range of photosynthetic bacterial light-harvesting complex 2 (LH2 from Rhodopseudomonas acidophila 10050), artificial fluorescent dye (Alexa Fluor 647: A647) was covalently attached to N- and C-terminal Lys residues in LH2 α-polypeptides with a molar ratio of A647/LH2 ≃ 9/1. Fluorescence and transient absorption spectroscopies revealed that intracomplex energy transfer from A647 to intrinsic chromophores of LH2 (B850) occurs in a multiexponential manner, with time constants varying from 440 fs to 23 ps through direct and B800-mediated indirect pathways. Kinetic analyses suggested that B800 chromophores mediate faster energy transfer, and the mechanism was interpretable in terms of Förster theory. This study demonstrates that a simple attachment of external chromophores with a flexible linkage can enhance the light harvesting activity of LH2 without affecting inherent functions of energy transfer, and can achieve energy transfer in the subpicosecond range. Addition of external chromophores, thus, represents a useful methodology for construction of advanced hybrid light-harvesting systems that afford solar energy in the broad spectrum.
(キーワード): Amino Acid Sequence / Fluorescence Resonance Energy Transfer / Light-Harvesting Protein Complexes / Molecular Sequence Data / Photosystem II Protein Complex / Spectrometry, Fluorescence
(出版サイトへのリンク): ● Publication site (DOI): 10.1021/jacs.5b08508
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 26403467; ● Search Scopus @ Elsevier (PMID): 26403467; ● Search Scopus @ Elsevier (DOI): 10.1021/jacs.5b08508

(DOI: 10.1021/jacs.5b08508, PubMed: 26403467) Yukihide Ishibashi, Tetsuro Katayama, Hisayuki Saito, Kenichi Yamanaka, Yasutomo Goto, Takao Tani, Tadashi Okada, Shinji Inagaki and Hiroshi Miyasaka :
Cooperative conformational change and excitation migration of biphenyl-PMO amorphous film, as revealed by femtosecond time-resolved spectroscopy.,
The Journal of Physical Chemistry C, Vol.118, No.18, 9419-2894, 2014.

(出版サイトへのリンク): ● Publication site (DOI): 10.1021/jp502734u
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1021/jp502734u

(DOI: 10.1021/jp502734u) Tetsuro Katayama, Kenji Setoura, Daniel Werner, Hiroshi Miyasaka and Shuichi Hashimoto :
Picosecond-to-Nanosecond Dynamics of Plasmonic Nanobubbles from Pump-Probe Spectral Measurements of Aqueous Colloidal Gold Nanoparticles,
Langmuir, Vol.30, No.31, 9504-9513, 2014.

(要約): The photothermal generation of nanoscale vapor bubbles around noble metal nanoparticles is of significant interest, not only in understanding the underlying mechanisms responsible for photothermal effects, but also to optimize photothermal effects in applications such as photothermal cancer therapies. Here, we describe the dynamics in the 400 900-nm regime of the formation and evolution of nanobubbles around colloidal gold nanoparticles using picosecond pump-probe optical measurements. From excitations of 20 150-nm colloidal gold nanoparticles with a 355-nm, 15-ps laser, time-dependent optical extinction signals corresponding to nanobubble formation were recorded. The extinction spectra associated with nanobubbles of different diameters were simulated by considering a concentric spherical core-shell model within the Mie theory framework. In the simulations, we assumed an increase in particle temperature. From temporal changes in the experimental data of transient extinctions, we estimated the temporal evolution of the nanobubble diameter. Corrections to bubble-free temperature effects on the transient extinction decays were applied in these experiments by suppressing bubble formation using pressures as high as 60 MPa. The results of this study suggest that the nanobubbles generated around a 60-nm-diameter gold nanoparticle using a fluence of 5.2 mJ cm-2 had a maximum diameter of 260 ± 40 nm, and a lifetime of approximately 10 ns. The combination of fast transient extinction spectral measurements and spectral simulations provides insights into plasmonic nanobubble dynamics.
(出版サイトへのリンク): ● Publication site (DOI): 10.1021/la500663x
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 25083945; ● Summary page in Scopus @ Elsevier: 2-s2.0-84905996436

(DOI: 10.1021/la500663x, PubMed: 25083945, Elsevier: Scopus) Tetsuro Katayama, Akira Jinno, Eisuke Takeuchi, Syoji Ito, Masaru Endo, Atsushi Wakamiya, Yasujiro Murata, Yuhei Ogomi, Shuzi Hayase and Hiroshi Miyasaka :
Inhomogeneous deactivation process with UV excitation in submicron grains of lead iodide perovskite-based solar cell as revealed by femtosecond transient absorption microscopy.,
Chemistry Letters, Vol.43, 1656-1658, 2014.

(出版サイトへのリンク): ● Publication site (DOI): 10.1246/cl.140551
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1246/cl.140551

(DOI: 10.1246/cl.140551) Yutaka Nagasawa, Yusuke Yoneda, Shohei Nambu, Masayasu Muramatsu, Eisuke Takeuchi, Hiroki Tsumori, Soichiro Morikawa, Tetsuro Katayama and Hiroshi Miyasaka :
Coherent wavepacket motion in an ultrafast electron transfer system monitored by femtosecond degenerate four-wave-mixing and pumpprobe spectroscopy,
Chemical Physics, Vol.442, 68-76, 2013.

(出版サイトへのリンク): ● Publication site (DOI): 10.1016/j.chemphys.2014.02.004
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1016/j.chemphys.2014.02.004

(DOI: 10.1016/j.chemphys.2014.02.004) Masayasu Muramatsu, Satoe Morishima, Tetsuro Katayama, Syoji Ito, Yutaka Nagasawa and Hiroshi Miyasaka :
The Effect of Pre-solvation in the Ground State on Photoinduced Electron Transfer in Ionic Liquids,
Journal of Solution Chemistry, Vol.43, 1550-1560, 2013.

(出版サイトへのリンク): ● Publication site (DOI): 10.1007/s10953-014-0227-7
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1007/s10953-014-0227-7

(DOI: 10.1007/s10953-014-0227-7) Tomokatsu Kushida, Cristopher Camacho, Ayumi Shuto, Stephan Irle, Masayasu Muramatsu, Tetsuro Katayama, Syoji Ito, Yutaka Nagasawa, Hiroshi Miyasaka, Eri Sakuda, Noboru Kitamura, Zhiguo Zhou, Atsushi Wakamiya and Shigehiro Yamaguch :
Constraint-induced structural deformation of planarized triphenylboranes in the excited state.,
Chemical Science, Vol.5, No.4, 1296-1304, 2013.

(出版サイトへのリンク): ● Publication site (DOI): 10.1039/C3SC52751D
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1039/C3SC52751D

(DOI: 10.1039/C3SC52751D) Chettiyam Veettil Suneesh, Bijitha Balan, Hironobu Ozawa, Yuki Nakamura, Tetsuro Katayama, Masayasu Muramatsu, Yutaka Nagasawa, Hiroshi Miyasaka and Ken Sakai :
Mechanistic studies of photoinduced intramolecular and intermolecular electron transfer processes in RuPt-centred photo-hydrogen-evolving molecular devices.,
Physical Chemistry Chemical Physics, Vol.16, No.4, 1607-1616, 2013.

(出版サイトへのリンク): ● Publication site (DOI): 10.1039/C3CP54630F
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1039/C3CP54630F

(DOI: 10.1039/C3CP54630F) Masayasu Muramatsu, Tetsuro Katayama, Syoji Ito, Yutaka Nagasawa, Daisuke Matsuo, Yoshinori Suzuma, Lifen Peng, Akihiro Orita, Junzo Otera and Hiroshi Miyasaka :
Photoinduced charge-transfer dynamics of sequentially aligned donoracceptor systems in an ionic liquid,
Photochemical & Photobiological Sciences, Vol.12, No.10, 1885-1894, 2013.

(出版サイトへのリンク): ● Publication site (DOI): 10.1039/C3PP50198A
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1039/C3PP50198A

(DOI: 10.1039/C3PP50198A) Shunsuke Sato, Yasuo Matubara, Kazuhide Koike, Magnus Falkenström, Tetsuro Katayama, Yukihide Ishibashi, Hiroshi Miyasaka, Seiji Taniguchi, Haik Chosrowjan, Noboru Mataga, Naoto Fukazawa, Shinya Koshihara, Ken Onda and Osamu Ishitani :
Dynamics Photochemistry of fac-Re(bpy)(CO)3Cl.,
Chemistry - A European Journal, Vol.18, No.49, 15722-15734, 2012. Yuta Takagi, Tomohiro Kunishi, Tetsuro Katayama, Yukihide Ishibashi, Hiroshi Miyasaka, Masakazu Morimoto and Masahiro Irie :
Photoswitchable fluorescent diarylethene derivatives with short alkyl chain substituents.,
Photochemical & Photobiological Sciences, Vol.11, No.11, 1661-1665, 2012.

(要約): The sulfone derivatives of 1,2-bis(2-alkyl-6-phenyl-1-benzothiophen-3-yl)perfluorocyclopentene having various short alkyl chain substituents at reactive carbons were prepared and the effect of alkyl substitution on the fluorescence property of the closed-ring isomers was studied. Upon irradiation with ultraviolet (UV) light the derivatives exhibit a brilliant green fluorescence under irradiation with visible (> 400 nm) light, while the fluorescence disappears upon irradiation with visible (> 400 nm) light alone. The fluorescence quantum yield of the methyl substituted derivative (1b) dramatically decreases from 0.84 to 0.15 when the solvent is changed from hexane to acetonitrile, while the changes of ethyl, n-propyl and n-butyl substituted derivatives (2b)-(4b) are moderate. The quantum yields of (2b)-(4b) are kept to values close to 0.7 even in polar acetonitrile. The fluorescence lifetime measurement revealed that efficient non-radiative decay processes took place in (1b) in polar solvent, while their contribution to the deactivation was not so large in (2b)-(4b). The neighboring short alkyl chains at the connecting carbons are considered to defend the sulfone units against the attack of polar solvent molecules and weaken the solvent polarity effect.
(出版サイトへのリンク): ● Publication site (DOI): 10.1039/c2pp25078k
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 23243668; ● Search Scopus @ Elsevier (PMID): 23243668; ● Search Scopus @ Elsevier (DOI): 10.1039/c2pp25078k

(DOI: 10.1039/c2pp25078k, PubMed: 23243668) Yukihide Ishibashi, Miya Arinishi, Tetsuro Katayama, Hiroshi Miyasaka and Tsuyoshi Asahi :
Excited-state Dynamics of Fullerene Nanoparticles Dispersed in Pure Water.,
Chemistry Letters, Vol.41, No.12, 1104-1106, 2012.

(要約): Femtosecond transient absorption dynamics of C<sub>60</sub> nanoparticles in pure water revealed a strong quenching of the singlet excited state, independent of the excitation light intensity on a 10-ps time scale, and an extremely low yield of the triplet state of C<sub>60</sub> nanoparticles upon photoexcitation.
(出版サイトへのリンク): ● Publication site (DOI): 10.1246/cl.2012.1104
(文献検索サイトへのリンク): ● CiNii @ 国立情報学研究所 (CRID): 1360846644041738880; ● Summary page in Scopus @ Elsevier: 2-s2.0-84868276687

(DOI: 10.1246/cl.2012.1104, CiNii: 1360846644041738880, Elsevier: Scopus) Tetsuro Katayama, Yukihide Ishibashi and Hiroshi Miyasaka :
Direct detection of Electron Transfer Processes in Photoconductive Poly(N-vinylcarbazole) Solid Film Doped with Electron Acceptors: Temperature Dependence of Femtosecond to Microsecondmics.,
Journal of Photochemistry and Photobiology A: Chemistry, Vol.234, No.1, 107-114, 2012. Arabinda Mallick, Tetsuro Katayama, Yukihide Ishibashi, Masakazu Yasuda and Hiroshi Miyasaka :
Norharmane: Old yet highly selective dual channel ratiometric fluoride and hydrogen sulfate ion sensor.,
Analyst, Vol.136, No.2, 275-277, 2011.

(出版サイトへのリンク): ● Publication site (DOI): 10.1039/C0AN00650E
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1039/C0AN00650E

(DOI: 10.1039/C0AN00650E) Yutaka Nagasawa, Kenji Fujita, Tetsuro Katayama, Yukihide Ishibashi, Hiroshi Miyasaka, Teruhiro Takabe, Satoshi Nagao and Shun Hirota :
Coherent dynamics and ultrafast excited state relaxation of blue copper protein; plastocyanin.,
Physical Chemistry Chemical Physics, Vol.12, No.23, 6067-6075, 2010.

(要約): Ultrafast transient absorption measurements in the femtosecond to picosecond time region were carried out for a blue copper protein, plastocyanin (Pc). To compare the dynamical profiles after photoexcitation upon the ligand-to-metal-charge-transfer (LMCT) band and the d-d transition band, the pump wavelength was set at wavelengths of 597 and 895 nm, respectively. The results were nearly identical, indicating that the transition from the LMCT to the lower ligand field (LF) states takes place in an ultrafast time regime of less than 40 fs. Subsequently, relaxation in the LF state occurs with a time constant of 90 fs and the system returns to the ground state with that of 250 fs. The longest time constant of 1.8 ps was attributed to the vibrational cooling in the ground state. Several wavepacket motions were observed, including Franck-Condon type motion at approximately 510 nm and a Herzberg-Teller type motion at 660-720 nm. Critically damped low-frequency oscillation of approximately 30 cm(-1) was also observed with both excitation wavelengths with the strongest amplitude around 600 nm. This oscillation could be due to the motion of the protein that is ballistically stimulated by ultrafast relaxation.
(キーワード): Kinetics / Ligands / Molecular Dynamics Simulation / Plastocyanin / Spectrophotometry / Time Factors / Vibration
(出版サイトへのリンク): ● Publication site (DOI): 10.1039/b926518j
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 20405076; ● Search Scopus @ Elsevier (PMID): 20405076; ● Search Scopus @ Elsevier (DOI): 10.1039/b926518j

(DOI: 10.1039/b926518j, PubMed: 20405076) Tsuyoshi Fukaminato, Masaaki Tanaka, Takao Doi, Nobuyuki Tamaoki, Tetsuro Katayama, Arabinda Mallick, Yukihide Ishibashi, Hiroshi Miyaska and Masahiro Irie :
Fluorescence photoswitching of a diarylethene-perylenebisimide dyad based on intramolecular electron transfer.,
Photochemical & Photobiological Sciences, Vol.9, No.2, 181-187, 2010.

(出版サイトへのリンク): ● Publication site (DOI): 10.1039/B9PP00131J
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1039/B9PP00131J

(DOI: 10.1039/B9PP00131J) Yukihide Ishibashi, Katsuki Okuno, Chikashi Ota, Toshiyuki Umesato, Tetsuro Katayama, Masataka Mutakami, Seiya Kobatake, Masahiro Irie and Hiroshi Miyasaka :
Multiphoton-gated cycloreversion reactions of photochromic diarylethene derivatives with low reaction yields upon one-photon visible excitation.,
Photochemical & Photobiological Sciences, Vol.9, No.2, 172-180, 2010.

(出版サイトへのリンク): ● Publication site (DOI): 10.1039/B9PP00116F
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1039/B9PP00116F

(DOI: 10.1039/B9PP00116F) Tetsuro Katayama, Yukihide Ishibashi, Yuji Morii, Christian Ley, Johanna Brazard, Fabien Lacombat, Pascal Plaza, Monique M. Martin and Hiroshi Miyasaka :
Ultrafast delocalization of cationic states in poly(N-vinylcarbazole) solid leading to carrier photogeneration,
Physical Chemistry Chemical Physics, Vol.12, No.18, 4560-4563, 2010.

(要約): Femtosecond measurements of the transient dichroism and near-IR time-resolved spectra revealed the ultrafast delocalization of the cationic state in poly(N-vinylcarbazole), leading to carrier photogeneration.
(出版サイトへのリンク): ● Publication site (DOI): 10.1039/b925461g
(文献検索サイトへのリンク): ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 20428534; ● Search Scopus @ Elsevier (PMID): 20428534; ● Search Scopus @ Elsevier (DOI): 10.1039/b925461g

(DOI: 10.1039/b925461g, PubMed: 20428534) Yukihide Ishibashi, Tetsuro Katayama, Chicashi Ota, Seiya Kobatake, Masahiro Irie, Yasushi Yokoyama and Hiroshi Miyasaka :
Ultrafast Laser Spectroscopic Study on Photochromic Cycloreversion Dynamics in Fulgide Derivatives: One-Photon and Multiphoton-Gated Reactions,
New Journal of Chemistry, Vol.33, No.6, 1409-1411, 2009. Kingo Uchida, Tetsuro Katayama, Yukihide Ishibashi and Hiroshi Miyasaka :
Photoisomerization of Azobenzene Gel by Pulsed Laser Irradiation,
Chemical Communications, Vol.29, 4420-4422, 2009.

MISC

Keita Hoshi, Takashi Kinouchi, Tetsuro Katayama, Keiji Minagawa, Akihiro Furube, Yasushi Imada and Fumitoshi Yagishita :
Synthesis of blue luminescent boron complex of 3-(o-hydroxyphenyl)imidazo[1,5-a]pyridine,
Proceedings of the LED General Forum 2022 Tokushima, 149-150, 2022. Keita Hoshi, Tetsuro Katayama, Keiji Minagawa, Akihiro Furube, Yasushi Imada and Fumitoshi Yagishita :
Photodimers of symmetrical tetraaryl[3]cumulenes showing crystallization-induced emission enhancement nature,
Proceedings of the LED General Forum 2022 Tokushima, 145-148, 2022. Yusuke Yoneda, Tetsuro Katayama, Yutaka Nagasawa, Hiroshi Miyasaka and Yasufumi Umena :
Energy Transfer between Subunits of Photosystem II Dimer Observed by Femtosecond Transient Absorption.,
Optics InfoBase Conference Papers, International Conference on Ultrafast Phenomena 2016, 2016.

(出版サイトへのリンク): ● Publication site (DOI): 10.1364/UP.2016.UTu4A.40
(文献検索サイトへのリンク): ● Summary page in Scopus @ Elsevier: 2-s2.0-85019537902

(DOI: 10.1364/UP.2016.UTu4A.40, Elsevier: Scopus) Yutaka Nagasawa, Yusuke Yoneda, Tetsuro Katayama, Hiroshi Miyasaka, Naoto Mizutani, Tomoyasu Noji and Takehisa Dewa :
Ultrafast Energy Transfer in LH2 Photosynthetic Antenna Conjugated with Artificial Fluorescent Dyes,
Optics InfoBase Conference Papers, International Conference on Ultrafast Phenomena 2014, 2014.

(出版サイトへのリンク): ● Publication site (DOI): 10.1364/UP.2014.08.Tue.C.6
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1364/UP.2014.08.Tue.C.6

(DOI: 10.1364/UP.2014.08.Tue.C.6) Eisuke Takeuchi, Masayasu Muramastu, Tetsuro Katayama, Syoji Ito, Yutaka Nagasawa and Hiroshi Miyasaka :
Ultrafast Intramolecular Charge Transfer Process of Asymmetric 9,9-Bianthryl derivative in Ionic Liquid,
Optics InfoBase Conference Papers, International Conference on Ultrafast Phenomena 2014, 2014.

(出版サイトへのリンク): ● Publication site (DOI): 10.1364/up.2014.09.wed.p3.19
(文献検索サイトへのリンク): ● Summary page in Scopus @ Elsevier: 2-s2.0-85088723826

(DOI: 10.1364/up.2014.09.wed.p3.19, Elsevier: Scopus) Yutaka Nagasawa, Kenji Fujita, Tetsuro Katayama, Yukihide Ishibashi, Hiroshi Miyasaka, Teruhiro Takabe, Satoshi Nagao and Shun Hirota :
Coherent nuclear motions of blue copper protein, plastocyanin: comparing LMCT and d-d Excitation,
Optics InfoBase Conference Papers, International Conference on Ultrafast Phenomena 2010, 2010.

総説・解説

片山哲郎 :
フェムト秒顕微過渡吸収分光法,
分光研究, Vol.71, No.1, 2022年2月.

(文献検索サイトへのリンク): ● CiNii @ 国立情報学研究所 (CRID): 1390864114687488512

(CiNii: 1390864114687488512) 片山哲郎 :
半導体微粒子の超高速分光計測,
光化学, Vol.51, No.3, 132-137, 2020年12月.

(文献検索サイトへのリンク): ● CiNii @ 国立情報学研究所 (CRID): 1520009409534630400

(CiNii: 1520009409534630400) 片山哲郎 :
顕微過渡吸収測定手法による微小空間の励起状態ダイナミクス,
光化学, Vol.46, 173-175, 2015年12月. 片山哲郎, Hiroshi Miyasaka :
フェムト秒顕微過渡吸収測定装置によるペロブスカイト型太陽電池の不均一電子移動反応,
ファインケミカル, Vol.44, 14-19, 2015年7月. Yutaka Nagasawa, Mayu Ogasawara, 片山哲郎, Genki Katayama, Shoji Ito, Hiroshi Miyasaka :
糖水溶液中の励起3重項状態の酸素による消光,
低温生物工学会誌, Vol.53, 129-132, 2007年12月.

講演・発表

OGAWA Itsuki, Shoko Ueta, Tetsuro Katayama, Akihiro Furube, Atsushi Tabata, Keiji Minagawa and Fumitoshi Yagishita :
Synthesis of Boron Complexes Based on N,N-Type Bidentate Imidazopyridine Ligands and Evaluation of Their Photophysical Properties,
10th International Conference on Advanced Materials Development and Performance, Sep. 2024. yamamoto akira, Tetsuro Katayama, Endo Takahiko, Miyata Yasumitsu and Akihiro Furube :
Observation of carrier diffusion dynamics between monolayer and few-layer WSe2 by femtosecond transient absorption microscopy,
12th Asian Photochemistry Conference, Dec. 2023. Tetsuro Katayama, yuichi ikura and Akihiro Furube :
Observation of lasing dynamics in a CH3NH3PbBr3 crystal by femtosecond transient absorption microscopy,
12th Asian Photochemistry Conference, Vol.C127, Dec. 2023. Akihiro Furube, Sasaki Kohei, Wu Kejun, Kokufu Tatsuki, Tetsuro Katayama and Pankaj Koinkar :
Preparation and Ultrafast Spectroscopy of WS2Au Nanohybrid Systems for Photocatalysis Under Visible Light,
12th Asian Photochemistry Conference (APC 2023), C106, Dec. 2023. Tetsuro Katayama, yuichi ikura and Akihiro Furube :
Observation of Franz-Keldyshs Modulation in a Quasi-two-dimensional Perovskite Crystal by Femtosecond Transient Absorption Microscopy,
MNC2023, Nov. 2023. Tetsuro Katayama :
Observation of Franz-Keldysh Modulation in a CH3NH3PbBr3 Crystal as Revealed by Femtosecond Transient Absorption Microscopy,
Carbon Chemistry Materials 2023, Oct. 2023. yuichi ikura, yamamoto akira, Tetsuro Katayama and Akihiro Furube :
Carrier dynamics in a quasi-two-dimensional perovskite crystal by utilizing femtosecond transient absorption microscopy,
The 31st International Conference on Photochemistry, Vol.P26-034, Jul. 2023. ueda shuto, yamamoto akira, Tetsuro Katayama, Umena Yasufumi and Akihiro Furube :
Unraveling the energy transfer dynamics in a single crystal of phycocyanin protein using femtosecond transient absorption microscopy,
The 31st International Conference on Photochemistry, Vol.P26-033, Jul. 2023. Yuyama Shunsuke, Pankaj Koinkar, Tetsuro Katayama and Akihiro Furube :
Silicon Carbide Nanoparticle Fabrication by Laser Ablation in Liquid and Carrier Dynamics Evaluation by Transient Absorption Spectroscopy,
The 31st International Conference on Photochemistry, P26-035, Jul. 2023. Hosaki Renna, Maeda Yasuyuki, Tetsuro Katayama, Pankaj Koinkar, Akihiro Furube, Lin Lihua, Hisatomi Takashi and Domen Kazunari :
Size reduction of Y2Ti2O5S2 photocatalyst particles by laser ablation and evaluation of their carrier dynamics,
The 31st International Conference on Photochemistry, P25-060, Jul. 2023. Tetsuro Katayama, yuichi ikura, yuma fujita and Akihiro Furube :
Observation of Franz-Keldysh modulation in a CH3NH3PbBr3 crystal by femtosecond transient absorption microscopy,
The 31st International Conference on Photochemistry, Vol.S2-15-CL, Jul. 2023. Akihiro Furube, Tsurusaki Yuto, Saika Kei, Murase Masaki, Pankaj Koinkar and Tetsuro Katayama :
Femtosecond Dynamics of Charge Transfer between Plasmonic Metal and Semiconductor Nanostructures,
The 31st International Conference on Photochemistry, S2-11-IL, Jul. 2023. Akihiro Furube, Sasaki Kohei, Kokufu Tatsuki, Tetsuro Katayama and Pankaj Koinkar :
Ultrafast Charge Transfer Dynamics in WS2Au Nanohybrid System Fabricated by Pulsed Laser Ablation in Liquid,
243rd ECS Meeting, B07-1372, May 2023. Kusaka Tomoki, Akihiro Furube, Tetsuro Katayama, Hiroki Kishikawa, Yasuhide Ohno, Masao Nagase and Junichi Fujikata :
Demonstration of All-Optical Ultrafast Switching, Using High-Quality Graphene,
pLED international symposium 2023, P-9, Mar. 2023. Tetsuro Katayama :
Observation of Franz-Keldysh Modulation in a Lead Halide Perovskite Crystal by Femtosecond Transient Absorption Microscopy,
pLED International symposium 2023, Mar. 2023. Ueda Shuto, Yamamoto Akira, Fujita Yuma, Tetsuro Katayama, Akihiro Furube and Umena Yasufumi :
Observation of energy transfer dynamics in a phycocyanin protein crystal by utilizing femtosecond transient absorption microscopy,
MNC2022,11P-4-22, Nov. 2022. Yamamoto Akira, Fujita Yuma, Akagi Yuichiro, Tetsuro Katayama and Akihiro Furube :
Observation of carrier dynamics in MoS2 thin layer by femtosecond transient absorption microscopy,
MNC2022,11B-2-1, Nov. 2022. Fujita Yuma, Akagi Yuichiro, Tetsuro Katayama and Akihiro Furube :
Observation of electronic spectra modulation in a CH3NH3PbBr3 crystal by utilizing transient absorption microscopy,
MNC2022,11C-2-4, Nov. 2022. Tomoki Kusaka, Akihiro Furube, Tetsuro Katayama, Hiroki Kishikawa, Yasuhide Ohno, Masao Nagase and Junichi Fujikata :
Ultrafast All-Optical Switching with High-Quality Graphene and its Polarization Effect,
15th Pacific Rim Conference on Lasers and Electro-Optics (CLEO Pacific Rim, CLEO-PR 2022), CTuA2D-04, Sapporo, Aug. 2022.

(出版サイトへのリンク): ● Publication site (DOI): 10.1364/CLEOPR.2022.CTuA2D_04
(文献検索サイトへのリンク): ● Summary page in Scopus @ Elsevier: 2-s2.0-85166478578

(DOI: 10.1364/CLEOPR.2022.CTuA2D_04, Elsevier: Scopus) Kokufu Tatsuki, Nakayama Daichi, Tetsuro Katayama, Pankaj Koinkar and Akihiro Furube :
Characterization of tungsten sulfide nanosheets attached on gold nanoparticles modified SERS active substrates,
The 13th Asia-Pacific Conference on Near-Field Optics (APNFO13), Sapporo, Jul. 2022. Tomoki Kusaka, Akihiro Furube, Tetsuro Katayama, Hiroki Kishikawa, Yasuhide Ohno, Masao Nagase and Junichi Fujikata :
Demonstration of All-Optical Ultrafast Switching, Using High-Quality Graphene,
27th OptoElectronics and Communications Conference (OECC 2022), WP-F-4, Toyama, Jul. 2022.

(出版サイトへのリンク): ● Publication site (DOI): 10.23919/OECC/PSC53152.2022.9849944
(文献検索サイトへのリンク): ● Summary page in Scopus @ Elsevier: 2-s2.0-85136959493

(DOI: 10.23919/OECC/PSC53152.2022.9849944, Elsevier: Scopus) Ueda Shuto, Yamamoto Akira, Fujita Yuma, Tetsuro Katayama, Umena Yasufumi and Akihiro Furube :
Unravelingthe Energy Transfer Mechanism in a Phycocyanin Protein Crystal by Femtosecond Transient Absorption Microscopy,
pLED International symposium 2023, Mar. 2022. Ikura Yuichi, Fujita Yuma, Akagi Yuichiro, Tetsuro Katayama and Akihiro Furube :
Observation of inhomogeneous carrier generation in a CH3NH3 PbBr3 crystal by femtosecond transient absorption microscopy,
MNC2022, 10P-2-6, Jan. 2022. Kokufu Tatsuki, Nakayama Daichi, Tetsuro Katayama, Pankaj Koinkar and Akihiro Furube :
Fabrication and Spectroscopic Characterization of Gold Nanoparticle Arrays Modified with Tungsten Sulfide Particles,
11th Asian Photochemistry Conference, P-03-7, Nov. 2021. Yuma Fujita, Yuichiro Akagi, Tetsuro Katayama and Akihiro Furube :
Polarization Dependence of Lasing Dynamics in a Lead Halide Perovskite Crystal Revealed by Femtosecond Transient Absorption Microscopy,
8th Asian Photochemistry ConferenceOnline, Nov. 2021. Nakayama Daichi, Pankaj Koinkar, Tetsuro Katayama and Akihiro Furube :
Creation of three dimensional tin oxide nanostructure via laser ablation in liquid,
9th International Conference on Advanced Materials Development & Performance (AMDP 2021), MP-21-0166, Oct. 2021. SIDDHANT DHONGADE, Tetsuro Katayama, Pankaj Koinkar, Maki Yutaro and Akihiro Furube :
Charge Carrier Dynamics of In2Se3 Nanocubes and Plasmonic Composites Fabricated By Laser Ablation As Primary Processes of Solar Energy Conversion,
239th ECS Meeting, B07-0709, Jun. 2021.

(出版サイトへのリンク): ● Publication site (DOI): 10.1149/MA2021-0115709mtgabs
(文献検索サイトへのリンク): ● Search Scopus @ Elsevier (DOI): 10.1149/MA2021-0115709mtgabs

(DOI: 10.1149/MA2021-0115709mtgabs) Akihiro Furube, Maki Yutaro, Tetsuro Katayama and Chen Liang-Yih :
Ultrafast Carrier Dynamics in Hematite Photoanode Decorated with Au nanorods under NIR Plasmon Excitation,
7th International Forum on Advanced Technologies, Mar. 2021. Akihiro Furube, Mori Koki, Tetsuro Katayama, Chen Shih-Hsuan and Chen Liang-Yih :
Charge Carrier Dynamics of CsPbBr3 Quantum Dots Showing Water Treatment Effect of Photoluminescence Efficiency,
Online International Conference on Hybrid and Organic Photovoltaics, May 2020. Tetsuro Katayama, Akagi Yuichiro and Akihiro Furube :
Hot carrier transporting modeling of nonlinear emission dynamics in a CH3NH3PbBr3 microcrystal by femtosecond transient absorption microscopy,
12th Conference on Hybrid and Organic Photovoltaics, England (Online), 105, May 2020. Akagi Yuichiro, Tetsuro Katayama and Akihiro Furube :
Visualization of the Nonlinear Emission Dynamics of Organic-inorganic Perovskite Microcrystal System using Femtosecond Transient Absorption Microscopy,
12th Conference on Hybrid and Organic Photovoltaics, England (Online), 067, May 2020. Fujitaka Ayana, Usui Yuta, Tetsuro Katayama and Tamai Naoto :
Exciton Dynamics of Small Sized InP Quantum Dots and Its Core-shell Structure,
The 29th International Conference on Photochemistry, ULTPhoto_P14, Boulder, Colorado, USA, July , 2019, Boulder, Colorado, USA, Jul. 2019. Tsuji Kosuke, Usui Yuta, Tetsuro Katayama and Tamai Naoto :
Hot Electron Transfer Dynamics of CdSe/ZnS Quantum Dots-Methyl Viologen Systems,
The 29th International Conference on Photochemistry, ULTPhoto_P11, Boulder, Colorado, USA, July , 2019, Boulder, Colorado, USA, Jul. 2019. Tanabe Yoko, Kori Shota, Usui Yuta, Tetsuro Katayama and Tamai Naoto :
Elementary Carrier Relaxation and Transfer Processes of ZnSe QDs,
The 29th International Conference on Photochemistry, ULTPhoto_P10, Boulder, Colorado, USA, July , 2019, Jul. 2019. Kataoka Taisei, Usui Yuta, Shibayama Daiki, Tetsuro Katayama, Morimoto Masakazu, Irie Masahiro and Tamai Naoto :
Photochromic Reaction of CdTe Quantum Dots-Diarylethene Derivative Hybrid System In Silent Wavelength,
The 29th International Conference on Photochemistry, ULTPhoto_P9, Boulder, Colorado, USA, July , 2019, Jul. 2019. Tamai Naoto, Wang Li, Jung Sunna, Tetsuro Katayama, Kamada Kenji and Hamura Toshiyuki :
Intramolecular Singlet Fission in Acene Dimers and Trimers: Rate Difference Exists?,
The 29th International Conference on Photochemistry, FUNDPhoto_T27, Boulder, Colorado, USA, July , 2019, Jul. 2019. 𠮷川陸斗, 伊藤翼, 星恵太, 上田昭子, 片山哲郎, 古部昭広, 南川慶二, 八木下史敏 :
テトラアリール[3]クムレン類の光反応,
2024年光化学討論会, 2024年9月. 市川彪, 谷彩楓, 水口仁志, 片山哲郎, 古部昭広, 南川慶二, 八木下史敏 :
8-BODIPY 置換イソアロキサジンの合成と光物性,
2024年光化学討論会, 2024年9月. 阿部壮太, 上田昭子, 片山哲郎, 古部昭広, 田端厚之, 南川慶二, 八木下史敏 :
ナフタレン縮環イミダゾ[1,2-a]ピリジニウム塩の合成と光機能性評価,
2024年光化学討論会, 2024年9月. OGAWA Itsuki, Shoko Ueta, Tetsuro Katayama, Akihiro Furube, Atsushi Tabata, Keiji Minagawa and Fumitoshi Yagishita :
Photophysical Properties of Boron Complexes Based on N,N-Type Imidazopyridine-Indole Ligands and Their Application as Photofunctional Materials,
2024年光化学討論会, Sep. 2024. 高田太陽, 玉有朋子, 片山哲郎, 小出静代, 金井純子, 北岡和義 :
徳島大学 i.school での学びと成長 - 参加学生の視点より ‐,
イノベーション教育学会第11回年次大会, 2024年3月. 中井里沙, 玉有朋子, 片山哲郎, 小出静代, 金井純子, 北岡和義 :
失敗感尺度と創造的態度の相関性-2023年度DP生より-,
イノベーション教育学会第11回年次大会, 2024年3月. 玉有朋子, 片山哲郎, 小出静代, 金井純子, 北岡和義 :
徳島大学 i.school におけるイノベーション教育の試み,
第20回ものづくり・創造性教育に関するシンポジウム講演要旨集, 24-26, 2023年12月. Tetsuro Katayama :
Observation of energy transfer dynamics between phycocyanin trimmers in a single crystal by femtosecond transient absorption microscopy,
第61回生物物理学会年会, Nov. 2023. 市川彪, 片山哲郎, 古部昭広, 荒川幸弘, 南川慶二, 今田泰嗣, 八木下史敏 :
ボロンジピロメテン-フラビン複合体の合成と特性評価,
2023年日本化学会中国四国支部大会山口大会, 2023年11月. 片山哲郎, 以倉優一, 古部昭広 :
フェムト秒顕微過渡吸収分光法を用いた擬二次元ペロブスカイト微結晶系のエネルギー移動反応ダイナミクス観測,
第17回分子科学討論会, Vol.4E05, 2023年9月. 伊藤翼, ?川陸斗, 星恵太, 片山哲郎, 古部昭広, 荒川幸弘, 南川慶二, 八木下史敏 :
テトラアリール[3]クムレン類の固相光二量化による高効率発光性分子の合成と発光特性評価,
2023年光化学討論会, 2023年9月. 以倉優一, 山本輝, 片山哲郎, 古部昭広 :
Carrier Dynamics of quasi-2D CsPbBr3 Microcrystals Investigated by Femtosecond Microscopic Transient Absorption Spectroscopy,
光化学討論会, Vol.2P18], 2023年9月. 上田柊斗, 山本輝, 片山哲郎, Umena Yasufumi, 古部昭広 :
Excitation energy transfer reaction mechanism in a single crystal of light-harvesting complex phycocyanin protein using femtosecond transient absorption microscopy,
2023年光化学, Vol.2P17P17, 2023年9月. 村瀬将起, 片山哲郎, 古部昭広 :
3D堆積AgナノワイヤーによるTiO2光触媒の可視光応答性増大とその電荷分離機構,
1P59, 2023年9月. Akihiro Furube, SASAKI Kohei, KOKUFU Tatsuki, Tetsuro Katayama and Pankaj Koinkar :
Ultrafast Spectroscopy of WS2Au Nanohybrid System Fabricated by Pulsed Laser Ablation in Liquid,
光化学討論会, 1B14, Sep. 2023. 藤方潤一, 日下智貴, 関和彦(産総研), 乗松航(名古屋大), 伊藤孝寛(名古屋大), 片山哲郎, 永瀬雅夫, 古部昭広 :
SiC上グラフェンを用いた高速非線形光学応答,
2023年第70回応用物理学会春季学術講演会, 17a-D215-5, 2023年3月. 鶴崎勇斗, 國府樹, 片山哲郎, 古部昭広, Matsuo Yasutaka :
顕微ラマン分光法による酸化チタン被覆金ナノ粒子配列体薄膜の構造解析,
第70回応用物理学会春季講演会, 15p-PB06-9, 2023年3月. 雑賀敬, 片山哲郎, 古部昭広 :
液中レーザーアブレーション法を用いたp-GaNとAuのナノ複合材料の作製と分光特性評価,
第70回応用物理学会春季講演会, 15p-PB06-7, 2023年3月. 片山哲郎, 山本輝, 遠藤尚彦, 片山哲郎, 宮田耕充, 古部昭広 :
フェムト秒顕微過渡吸収分光法によるWSe2単層および数層のキャリアダイナミクス観測とその層間角度依存性,
日本化学会第103春季年会,K205-4pm-02, 2023年3月. 上田柊斗, 山本輝, 藤田優真, 片山哲郎, 梅名泰史, 古部昭広 :
フェムト秒過渡吸収顕微鏡を用いたフィコシアニンタンパク質結晶内での色素間光励起エネルギー移動ダイナミクスの観察,
日本化学会第103春季年会,K205-2vn-07, 2023年3月. 以倉優一, 山本輝, 藤田優真, 片山哲郎, 古部昭広 :
フェムト秒過渡吸収顕微鏡を用いた擬二次元型CsPbBr3結晶のキャリアダイナミクスの観測,
日本化学会第103春季年会，K205-2vn-06, 2023年3月. 片山哲郎 :
フェムト秒顕微過渡吸収分光計測とその応用,
強光子場科学研究懇談会 2022年度第1回懇談会, 2023年1月. 玉有朋子, 片山哲郎, 小出静代, 金井純子, 有廣悠乃, 石原佑, 北岡和義 :
徳島大学i.schoolの取組み- 徳島大学が推進するイノベーション教育の事例紹介 -,
第10回イノベーション教育学会年次大会, 2022年11月.

(キーワード): イノベーション教育

八木下史敏, 星恵太, 片山哲郎, 古部昭広, 南川慶二, 今田泰嗣 :
テトラアリール[3]クムレン類の固相光二量化と結晶化誘起発光,
第30回有機結晶シンポジウム, 2022年11月. 日下智貴, 古部昭広, 片山哲郎, 岸川博紀, 大野恭秀, 永瀬雅夫, 藤方潤一 :
SiC 上高品質グラフェンを用いた全光型超高速光スイッチ,
2022年第83回応用物理学会秋季学術講演会, 22p-A402-17, 2022年9月. 村瀬将起, 片山哲郎, 古部昭広 :
3D堆積Agナノワイヤー/TiO₂を用いた可視応答光触媒シートの開発と電荷分離ダイナミクス,
光化学討論会, 2022年9月. 鶴崎勇斗, 國府樹, 片山哲郎, 古部昭広 :
酸化チタン被覆金ナノ粒子配列体薄膜における活性酸素発生効率の膜厚依存性,
光化学討論会, 2P58, 2022年9月. 雑賀敬, 片山哲郎, 古部昭広 :
金ナノ粒子と窒化ガリウム微粒子の複合材料の作製と界面電荷ダイナミクス,
光化学討論会, 2P-05, 2022年9月. 片山哲郎 :
フェムト秒顕微過渡吸収測定法を用いた有機無機ハロゲン化鉛ペロブスカイト単一微結晶中の自然放出光増幅ダイナミクスの解明,
2022年第83回応用物理学会秋季学術講演会, 2022年9月. 藤田優真, 片山哲郎, 古部昭広 :
フェムト秒顕微過渡吸収分光法によるCH3NH3PbBr3単一微結晶におけるキャリアダイナミクス制御,
第16回分子科学討論会，4P035, 2022年9月. 片山哲郎, 藤田優真, 古部昭広 :
フェムト秒顕微過渡吸収分光法を用いたハロゲン化鉛ペロブスカイト微結晶における光学発振ダイナミクスの励起波長依存性,
第16回分子科学討論会，4D07, 2022年9月. 山本輝, 藤田優真, 片山哲郎, ENDO Takahiko, MIYATA Yasumitsu, 古部昭広 :
Observation of carrier dynamics in monolayer and few-layer WSe2 by femtosecond micro transient absorption spectroscopy,
光化学討論会2022，1P56, 2022年9月. Fujita Yuma, Tetsuro Katayama and Akihiro Furube :
Excitation wavelength dependence of lasing mechanism in a Lead halide perovskite crystal by femtosecond transient absorption microscopy,
光化学討論会2022，1P57, Sep. 2022. Hasebe Shodai, Hagiwara Yuki, Tetsuro Katayama, Akihiro Furube, Asahi Toru and Koshima Hideko :
Creation of diverse photomechanical motions of polymorphic crystals by photoisomerization and the photothermal effect,
光化学討論会2022，1P88, Sep. 2022. 片山哲郎, 藤田優真, 古部昭広 :
Observation of lasing following hot carrier relaxation in CH3NH3PbBr3 microcrystal by using femtosecond transient absorption microscopy,
光化学討論会2022，3D03, 2022年9月. 片山哲郎 :
フェムト秒顕微過渡吸収分光法を用いた単一微結晶計測,
第48回生体分子科学討論会, 2022年5月. 新居大祐, 片山哲郎, 古部昭広 :
再沈法で作製したルブレン微結晶における光学特性のサイズ依存性と励起子分裂過程の時間分解分光観測,
第69回応用物理学会春季学術講演会, 23p-P10-19, 2022年3月. 國府樹, 片山哲郎, コインカーパンカジ, 古部昭広 :
硫化タングステンナノシート及び金ナノ粒子を修飾したSERS活性基板の作製とその分光特性評価,
第69回応用物理学会春季学術講演会, 22p-P01-1, 2022年3月. 片山哲郎 :
フェムト秒顕微過渡吸収計測法による微結晶系の励起状態ダイナミクス計測,
2022 年度新結晶成長学シンポジウム, 2022年3月. 片山哲郎, 藤田優真, 山本輝, 赤木裕一郎, 古部昭広 :
フェムト秒顕微過渡吸収分光法を用いたハロゲン化鉛ペロブスカイト結晶中のキャリアダイナミクスの偏光依存性,
日本化学会第102春季年会,F102-3am-04, 2022年3月. 山本輝, 藤田優真, 赤木裕一郎, 片山哲郎, 古部昭広 :
フェムト秒顕微過渡吸収分光法によるMoS2薄膜におけるキャリアダイナミクスの観測,
日本化学会第102春季年会，F102-2am-03], 2022年3月. 片山哲郎, 金井純子, 小出静代, 玉有朋子, 北岡和義 :
徳島大学の新入生，新任教員に対するオンライン・イノベーション・ワークショップの取り組み,
イノベーション教育学会第9回年次大会, 2022年2月. 北岡和義, 玉有朋子, 片山哲郎, 金井純子, 小出静代 :
「未来の本屋」イノベーションワークショップの設計，実施とその分析,
イノベーション教育学会第9回年次大会, 2022年2月. 田原晃生, 板家將海, 田端厚之, 長宗秀明, 片山哲郎, 古部昭広, 南川慶二, 今田泰嗣, 八木下史敏 :
イミダゾ[1,5-a]ピリジン三座配位子-ホウ素錯体の合成および構造と光物性評価,
2021年光化学討論会, 2021年9月. 星恵太, 片山哲郎, 古部昭広, 南川慶二, 今田泰嗣, 八木下史敏 :
テトラアリール[3]クムレンの光二量体合成と発光特性評価,
2021年光化学討論会, 2021年9月. 古部昭広, 片山哲郎 :
プラズモン材料およびペロブスカイト単一結晶における電荷移動ダイナミクス,
第82回応用物理学会秋季学術講演会, 12p-S201-5, 2021年9月. 藤田優真, 片山哲郎, 赤木裕一郎, 古部昭広 :
フェムト秒顕微過渡吸収分光法によるCH3NH3PbBr3単一微結晶における光学発振挙動の偏光励起依存性,
2021年光化学討論会, 2021年9月. 片山哲郎, 藤田優真, 赤木裕一郎, 古部昭広 :
フェムト秒顕微過渡吸収分光法によるハロゲン化鉛ペロブスカイト結晶における偏光励起キャリアダイナミクスの観測,
2021年光化学討論会, 2021年9月. 小林卓登, 赤木裕一郎, 片山哲郎, 古部昭広 :
走査型近接場光学顕微鏡による微粒子の形状および吸光・発光特性の評価,
応用物理・物理系中国四国支部合同学術講演会, Ap-6, 2021年7月. 新居大祐, 片山哲郎, 古部昭広 :
再沈法によるルブレン微結晶の作製と光学特性のサイズ依存性,
応用物理・物理系中国四国支部合同学術講演会, Ap-5, 2021年7月. 國府樹, 中山大知, 片山哲郎, コインカーパンカジ, 古部昭広 :
硫化タングステン微粒子を修飾した金ナノ粒子ガラス基板の作製とその分光特性評価,
応用物理・物理系中国四国支部合同学術講演会, Ap-3, 2021年7月. 長谷部翔大, 萩原佑紀, 劉芽久哉, 藤澤弘樹, 森川淳子, 片山哲郎, 古部昭広, 朝日透, 小島秀子 :
Diverse mechanical motions of polymorphic crystals based on photoisomerization and photothermal effect,
日本化学会第101春季年会 A08-4pm-12, 2021年3月. 片山哲郎, 藤田優真, 赤木裕一郎, 古部昭広 :
フェムト秒顕微過渡吸収スペクトル測定法によるCH3NH3PbBr3単一微結晶の非線形発光ダイナミクス計測,
日本化学会第101春季年会 A05-3pm-05, 2021年3月. 星恵太, 上田昭子, 片山哲郎, 古部昭広, 南川慶二, 河村保彦, 今田泰嗣, 八木下史敏 :
テトラアリール[3]クムレン類の光二量化とその二量体の結晶化誘起発光,
日本化学会第101春季年会, 2021年3月. 藤田優真, 赤木裕一郎, 片山哲郎, 古部昭広 :
フェムト秒顕微過度吸収スペクトル測定装置を用いたCH3NH3PbBr3微結晶のキャリアダイナミクス,
日本化学会第101春季年会 P04-1am-04, 2021年3月. 小林卓登, 赤木裕一郎, 片山哲郎, 古部昭広 :
走査型近接場光学顕微鏡による有機無機ペロブスカイト微結晶の形状および吸光特性,
第68回応用物理学会春季学術講演会, 17p-Z23-5, 2021年3月. 片山哲郎, 藤田優真, 山本輝, 赤木裕一郎, 古部昭広 :
フェムト秒顕微過渡吸収分光法を用いたハロゲン化鉛ペロブスカイト結晶中のキャリアダイナミクスの偏光依存性,
日本化学会第102春季年会, Vol.F102-3am-04, 2021年3月. 山本輝, 藤田優真, 赤木裕一郎, 片山哲郎, 古部昭広 :
フェムト秒顕微過渡吸収分光法によるMoS2薄膜におけるキャリアダイナミクスの観測,
日本化学会第102春季年会, 2021年3月. 星恵太, 上田昭子, 片山哲郎, 古部昭広, 南川慶二, 河村保彦, 今田泰嗣, 八木下史敏 :
テトラアリール[3]クムレンの二量化反応による高効率発光性分子の合成と発光特性評価,
2020年日本化学会中国四国支部大会島根大会, 2020年11月. 日口聖規, 小出洋史, 柳谷伸一郎, 川上烈生, 片山哲郎, 古部昭広, 太田薫, 富永圭介 :
金ナノ構造-酸化チタン積層膜のTHz-TDS評価,
第81回応用物理学会秋季学術講演会, 11a-Z24-7, 2020年9月. maki Yutaro, OKAZAKI Masahiro, Tetsuro Katayama, Akihiro Furube and CHEN Liang-Yih :
Generation of Long-lived Charges by Near-infrared Plasmon Resonance of Hematite Photoanode Decorated with Gold nanorods,
2020年光化学討論会, Sep. 2020. 片山哲郎, 大隅優, コインカーパンカジ, 古部昭広 :
フェムト秒レーザーアブレーションを用いて作製したBi2Se3微粒子系のキャリアダイナミクス,
2020年光化学討論会1D02, 2020年9月. 小林卓登, 赤木裕一郎, 片山哲郎, 古部昭広 :
走査型プローブ顕微鏡による有機無機ペロブスカイト微結晶の観察および光学特性,
応用物理・物理系学会中国四国支部合同学術講演会, Cp-3, 2020年8月. 片山哲郎, 大隅優, 小畑絢仁郎, コインカーパンカジ, 古部昭広 :
レーザーアブレーションを用いて作製したBi2Se3微粒子系のフェムト秒励起状態ダイナミクス,
日本化学会第100回春季年会, Vol.4D2-32, 2020年3月. 河合勇輝, 柳谷伸一郎, 矢野隆章, 片山哲郎, 古部昭広 :
レーザー照射した表皮角層細胞の顕微ラマン測定,
第67回応用物理学会春季学術講演会, 14a-PB2-14, 2020年3月. 黒川義貴, 相原一生, 片山哲郎, 橋本修一, 古部昭広 :
局所加熱による熱応答性高分子のマイクロ相分離観察とその評価,
OCU先端光科学シンポジウム, P1, 2019年10月. taisei kataoka, daichi eguchi, 片山哲郎, masakazu morimoto, masahiro irie, naoto tamai :
Excitation wavelength dependence of photochromic reaction of CdTe quantum dots-diarylethene derivative hybrid systems,
分子科学討論会2019, Vol.3p064, 2019年9月. ayana fujitaka, 片山哲郎, li wang, daichi eguchi, naoto tamai :
Exciton dynamics of InP quantum dots and its core-shell structure,
分子科学討論会2019, Vol.1p070, 2019年9月. kosuke tsuji, 片山哲郎, shota kori, daichi eguchi, naoto tamai :
hot electron transfer dynamics of CdSe/ZnS quantum dots-methyl viologen systems,
分子科学討論会2019, Vol.1b08, 2019年9月. 田邉陽子, 片山哲郎, 江口大地, 玉井尚登 :
ZnSe 量子ドットの発光量子収率の改善と励起子素過程の解明,
光化学討論会2019, Vol.3P110, 2019年9月. 柴山大樹, 片山哲郎, 森本正和, 入江正浩, 玉井尚登 :
CdSe 系ナノロッドージアリールエテン誘導体のエネルギー移動と反応効率,
光化学討論会2019, Vol.3P079, 2019年9月. shota kori, 片山哲郎, daichi eguchi, naoto tamai :
Size-Dependent Hot Electron Transfer Dynamics in CdTe Quantum Dots Fullerene Systems,
光化学討論会2019, Vol.1P109, 2019年9月. yakuya sukeyoshi, 片山哲郎, daichi eguchi, naoto tamai :
Preparation and Exciton Dynamics of CsPbBr3 Pt Heteronanocrystals,
光化学討論会2019, Vol.1P084, 2019年9月.

研究会・報告書: 研究者総覧に該当データはありませんでした。

特許: 片山哲郎, 木原虎 : レーザ素子及びレーザ装置, 特願2022-191437 (2022年11月), .
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補助金・競争的資金: フェムト秒顕微過渡吸収測定法によるたんぱく質微結晶の非破壊計測とその機構解明 (研究課題/領域番号: 22H04755 )
フェムト秒顕微過渡吸収測定法によるペロブスカイト結晶中の励起子ポラリトン挙動解明 (研究課題/領域番号: 19K05190 )
フェムト秒超解像顕微過渡吸収測定装置の開発と有機薄膜太陽電池系への応用 (研究課題/領域番号: 17K14084 )
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2024年11月22日更新

専門分野・研究分野: 物理化学 (Physical Chemistry)
光化学 (Photochemistry)
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受賞: 2022年11月, 第10回イノベーション教育学会年次大会優秀賞 (イノベーション教育学会)
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Jグローバル最終確認日: 2024/11/16 01:05
氏名（漢字）: 片山哲郎
氏名（フリガナ）: カタヤマテツロウ
氏名（英字）: Katayama Tetsuro
所属機関: 徳島大学助教

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researchmap最終確認日: 2024/11/17 03:25
氏名（漢字）: 片山哲郎
氏名（フリガナ）: カタヤマテツロウ
氏名（英字）: Katayama Tetsuro
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研究者番号: 80592360

所属（現在）: 2024/4/1 : 徳島大学, ポストLEDフォトニクス研究所, 助教

所属（過去の研究課題 情報に基づく）*注記: 2022/4/1 – 2023/4/1 : 徳島大学, ポストLEDフォトニクス研究所, 助教
2019/4/1 – 2021/4/1 : 徳島大学, 大学院社会産業理工学研究部(理工学域), 助教
2017/4/1 – 2018/4/1 : 関西学院大学, 理工学部, 助教

審査区分/研究分野: 研究代表者

理工系 / 総合理工 / ナノ・マイクロ科学 / ナノ材料化学
小区分28010:ナノ構造化学関連
複合領域

キーワード: 研究代表者

時間分解分光 / 顕微過渡吸収 / 光電変換過程 / 顕微過渡吸収測定法 / 超解像 / 構造化照明 / 光化学 / 物理化学 / 顕微分光 / 超解像技術 / ハロゲン化鉛ペロブスカイト / 顕微過渡吸収分光 / 励起子ポラリトン / 有機無機ハロゲン化鉛ペロブスカイト / 単一微結晶計測 / 超高速分光 / ペロブスカイト / 有機無機ペロブスカイト / 単結晶 / 単一たんぱく質結晶 / 励起状態ダイナミクス / 電子移動反応 / 生体試料 / 単一結晶 / 励起エネルギー移動反応

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片山 哲郎

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片山哲郎