2021 Fiscal Year Final Research Report
Study on photothermal conversion dynamics by means of femtosecond transient absorption imaging microspectroscopy
| Project/Area Number |
19K05211
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 28030:Nanomaterials-related
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| Research Institution | Ehime University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 時間分解ナノ分光 / 有機ナノ結晶 / 光熱変換過程 / 光協同現象 |
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| Outline of Final Research Achievements |
We developed a femtosecond pump-probe microspectroscopic imaging in order to explore excited-state dynamics in a single organic crystal with nanometer to micrometer size. We succeeded in visualizing excitation energy transfer along the shape and the size of the crystal. We then found out that the photothermal conversion process in organic nanocolloids and the organic nanoparticles showed a different thermalization process from novel nanoparticles. Moreover, we discovered new photo-synergetic phenomena coupled with laser heating and photochemical reaction in a nanoparticle.
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| Free Research Field |
物理化学
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| Academic Significance and Societal Importance of the Research Achievements |
光吸収によって発生した熱は分子光デバイスの性能に影響を与えるので、本研究の成果である有機ナノ固体における熱化過程を詳細な解明は、デバイスを設計する上で重要な基礎情報を与える。またレーザー光照射によって迅速な加熱とその熱の手助けによって光反応効率が大幅に増大する現象を見出しており、これは複数の光子と複数の分子による光協同現象として捉えることができ、新たな光エネルギー利用方法の観点から評価が高い。
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