2022 Fiscal Year Final Research Report
Mechanism study of nanoparticle assembly based on femtosecond laser multi-photon reduction
| Project/Area Number |
19H02474
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 26050:Material processing and microstructure control-related
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| Research Institution | Yamagata University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 超短パルスレーザー / ナノ材料 / 光熱変換 / レーザー描画 |
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| Outline of Final Research Achievements |
In conventional micropatterns have been fabricated by several processes such as lithography and etching, which generate a large amount of waste liquid, or by inkjet printing, which produces a small amount of waste liquid but is not so fine. On the other hand, we have developed a direct photofabrication process for functional materials only by light irradiation. This process is based on the findings of unique phenomenon that occurs in the laser focus. In this study, we investigated this phenomenon to understand the mechanism. Detailed observation with high-speed camera and heat transfer simulation indicated the validity of our proposed physical mechanism model. Two phenomena with large time difference proceeded during the laser writing. From this understanding the mechanism, we newly developed another laser writing process with high efficiency.
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| Free Research Field |
レーザー工学
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| Academic Significance and Societal Importance of the Research Achievements |
研究成果の学術的意義として，従来のレーザー直接描画手法の原理的課題ともされてきた適用材料の制限を克服し得る特異現象について，集光部で起こる光化学反応とそれを起点として誘起される流体現象の関係を明らかにした．いずれか一方だけの現象はこれまでも多く報告されており，ある意味で事前に現象を予測することも可能だが，この複合現象は当初，機構の推定が二転三転して解明には時間を要した．ただ，この機構解明を通して，廃液がほぼなく光照射だけで，多様な機能性材料についてマイクロ配線を高速で描く手法を開発することができ，これは脱炭素や効率的なエネルギー利用に役立つといった社会的意義に繋がったと考える．
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