2016 Fiscal Year Final Research Report
Chemistry in Femtosecond pulse Filamentation - Metalion Reduction and Metal nano Particle Formation-
| Project/Area Number |
26410028
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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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| Research Field |
Physical chemistry
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| Research Institution | Osaka City University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
YATSUHASHI Tomoyuki 大阪市立大学, 大学院理学研究科, 教授 (70305613)
YAMANAKA Ken-ichi 株式会社豊田中央研究所, 稲垣特別研究室, 研究員 (40418455)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | フィラメンテーション / フェムト秒レーザー / 金属微粒子 / 熔融塩 / イオン化 / 還元反応 |
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| Outline of Final Research Achievements |
Reductions followed by particle formation of metal ions in aqueous solution were studied using 800 nm, 90 femtosecond laser pulses with a laser intensity range beginning at sub-micro-Joules/pulse, where the intensities were at or just below supercontinuum generation. Products were observed as surface resonance absorptions assignable to Ag, Au nanoparticles (NPs) and light scattering, indicating the formation of Pd NPs. The consumption efficiencies of metal ions from the Au and Pd ions were estimated to be 10-3 per incident photon. The major absorbing species of the laser energy was water, which led to the formation of solvated electrons that acted as a reducing agent of metal ions, while direct multi-photon dissociation to neutral atoms was unlikely.
Metal ion Fe3+and Yb3+ systems are also discussed, where Fe3+ to Fe2+ was ascribed to two-photon absorption and Yb3+ to Yb2+ to a reduction followed by solvent ionization.
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| Free Research Field |
物理化学 反応
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