| 研究課題/領域番号 |
15K20833
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| 研究機関 | 北海道大学 |
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研究代表者 |
石 旭 北海道大学, 電子科学研究所, 研究員 (20749113)
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| 研究期間 (年度) |
2015-04-01 – 2017-03-31
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| キーワード | Plasmon / Titanium Dioxide / Gold Nanoparticles / Water Oxidation |
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| 研究実績の概要 |
During 2015~2016, we mainly focused on the plasmon-enhanced photocurrent generation on Au nanoparticles decorated TiO2 thin film photoelectrode. The principle achievements are described as below:
1).We demonstrated that the plasmon-enhanced photocurrent generation was remarkably improved by introducing a back-reflecting aluminum thin film beneath the TiO2 thin film. The strong interference in TiO2 thin film that deposited on Al thin film enabled the controlling of the interaction between incident photon and the plasmonic Au-NPs.
2).We found that plasmon-enhanced photocurrent generation and water oxidation were dramatically increased by partially inlaying Au-NPs inside the TiO2 thin film. The partially inlaid Au-NPs induced a larger incident light absorption and higher localized electromagnetic field creation, which resulted in the higher photocurrent generation and water oxidation.
3).We also investigated the charge transfer between TiO2 and Au-NPs by the surface plasmon spectroscopy. The critical role of barrier at the interface of Au-NPs/TiO2 for the charge transfer was demonstrated by monitoring the surface plasmon resonance.
These research achievements provide facile ways to enhance the plasmonic energy conversion on thin film semiconductor and increase the stability of plasmonic energy conversion system.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
Up till the present moment, current research are progressing rather smoothly. According to the research plan, We have obtained some significant research results regarding to the plasmon-enhanced photocurrent generation, water oxidation and charge transfer on Au-NPs loaded TiO2 thin film, and these three interesting results will be summarized and submitted to appropriate academical journal.
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| 今後の研究の推進方策 |
In 2016~2017, we plan to further investigate the plasmon-enhanced photocurrent generation by introducing metal-semiconductor-metal waveguide mode on ultra-thin TiO2 film (tens of nanometers). The ultrahigh incident light capture ability of the metal-semiconductor-metal waveguide mode is expected to used to enhance the plasmonic energy conversion. On the other hand, we plan to study the charge transfer between Au-NPs and TiO2 by means of transient absorption method, cooperating with Dr. li in our lab. The details of the charge transfer will be helpful for further understanding the mechanism of the plasmon-enhanced photocurrent generation and the plasmon-induced chemical reaction.
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| 次年度使用額が生じた理由 |
We originally planed to publish one paper in 2015~2016. However the publication was delayed to 2016~2017 due to some experiment data analyzation difficulty.
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| 次年度使用額の使用計画 |
Incurring amount will be mainly used for the paper publication in 2016~2017.
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