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Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
Published on: August 18, 2020
Plasmonic antenna effects on photochemical reactions
Shuyan Gao1, Kosei Ueno, Hiroaki Misawa
1Research Institute for Electronic Science, Hokkaido University, Sapporo, Japan.
Accounts of Chemical Research
|March 9, 2011
Summary
Metallic nanostructures enhance solar energy conversion by improving photoexcitation efficiency. This plasmonic approach boosts light absorption across visible to near-infrared wavelengths, enabling efficient photocurrent generation.
Area of Science:
- Materials Science
- Nanotechnology
- Photovoltaics
Background:
- Solar energy conversion requires efficient light absorption and minimal electron-hole recombination.
- Current photovoltaic cells struggle with broadband sunlight absorption, especially in the infrared spectrum.
- Low photon-material interaction probability limits photoexcitation efficiency.
Purpose of the Study:
- To investigate metallic nanostructures for enhancing photoexcitation efficiency across a wide solar spectrum.
- To explore the use of plasmonic optical antenna effects to overcome light diffraction limits.
- To demonstrate efficient photocurrent generation using nanostructure-assisted photochemistry.
Main Methods:
- Fabrication of coupled plasmonic gold nanoblocks using electron-beam lithography and a lift-off technique.
- Characterization of optical antenna effects via two-photon photoluminescence and nonlinear photopolymerization.
- Investigation of direct photocarrier injection and photocurrent generation.
Main Results:
- Demonstrated enhanced optical field domains around gold nanoblocks.
- Identified local two-photon photochemical reactions under weak light.
- Achieved direct photocarrier injection from gold nanorods into TiO(2).
- Generated efficient and stable photocurrent from 450 nm to 1300 nm without electron donors.
Conclusions:
- Metallic nanostructures, through plasmonic optical antenna effects, significantly enhance photoexcitation efficiency.
- This approach enables efficient light harvesting across visible to near-infrared wavelengths.
- The developed technology offers a promising pathway for advanced photovoltaic applications.
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