2018 Fiscal Year Final Research Report
Dynamics and Mechanism of Cooperative Photochemmical Reactions in Organic Nanocrystals
| Project Area | Application of Cooperative-Excitation into Innovative Molecular Systems with High-Order Photo-functions |
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| Project/Area Number |
26107011
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Ehime University |
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Principal Investigator |
Asahi Tsuyoshi 愛媛大学, 理工学研究科(工学系), 教授 (20243165)
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| Co-Investigator(Kenkyū-buntansha) |
石橋 千英 愛媛大学, 理工学研究科(工学系), 講師 (10506447)
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| Research Collaborator |
Onodera Tsunenobu
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| Project Period (FY) |
2014-07-10 – 2019-03-31
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| Keywords | ナノ結晶 / 光反応 / 協同効果 / 高密度励起 / 時間分解分光 / 単一ナノ粒子分光 |
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| Outline of Final Research Achievements |
To elucidae the synagetic effect that a number of photons and molecules cause in organic solids, we have examined the photochemical dynamics of 100-nm sized organic nanoparticlescolloids by means of steady-state and time-resolved spectroscopies. Especailly, we found that nonlinear enhancement of photochromic reaction induced by ns-laser pulse excitation. We revealed transient laser heating in a ns-time scale palyed a key role in the nonlinear responce and proposed out a novel type of photosynagetic resopnce charactaristic to organic solids, where the coopeative interactions of multi-photons and multi-chromphores are important. In relation to transient laser heating, colloidal dispersions phthalocyanine nanorods having 40 nm width and 500 nm length were fabricated successfully. We developed a sub-picosecond pump-probe microspectroscopic system, and succeeded in the measurement of the femtosecond excited-state dynamics of organic single nanoparticles
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| Free Research Field |
光化学
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| Academic Significance and Societal Importance of the Research Achievements |
多数の光子（光）と多数の分子の協同的効果によって初めて誘起される固体の光反応・応答は、光エネルギー利用の新たな可能性を切り開くものとして注目されている。本研究では、有機ナノ結晶という研究の歴史の新しい固体材料に着目し、光が分子の反応を誘起するだけでなく同時にナノ結晶を瞬時加熱し、それらの協同効果によって、固体の反応性が大きく変化することを示すことができた。こうした知見は固体反応の基礎理解を深めるだけでなく、光加工技術などへの応用に対して有益な情報を提供するものである。
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