2015 Fiscal Year Research-status Report
Plasmon-enhanced photoelectrochemical energy conversion on Au nanoparticles loaded titanium dioxide thin film
| Project/Area Number |
15K20833
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| Research Institution | Hokkaido University |
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Principal Investigator |
石 旭 北海道大学, 電子科学研究所, 研究員 (20749113)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | Plasmon / Titanium Dioxide / Gold Nanoparticles / Water Oxidation |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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| Causes of Carryover |
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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| Expenditure Plan for Carryover Budget |
Incurring amount will be mainly used for the paper publication in 2016~2017.
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Research Products
(2 results)
