Abstract
Photoelectrodes based on plasmonic Au semishell (or halfshell) arrays are developed. A colloidal crystal consisting of SiO2@TiO2 core-shell particles is prepared on a TiO2-coated transparent electrode. A Au semishell (or halfshell) array is deposited by sputtering or evaporation on the colloidal crystal. An electrode with the semishell (or halfshell) array exhibits negative photopotential shifts and anodic photocurrents under visible light at 500-800 nm wavelengths in an aqueous electrolyte containing an electron donor. In particular, hydroquinone and ethanol are good electron donors. The photocurrents can be explained in terms of plasmon-induced charge separation at the Au-TiO2 interface.
Highlights
Photoelectrodes based on plasmonic Au semishell arrays are developed
We found that exposure of metal-semiconductor nanocomposite to light at localized surface plasmon resonance (LSPR) wavelength induced plasmon-induced charge separation (PICS), which was realized by electron transfer from photoexcited metal nanoparticles to semiconductor.[3]
In order to further meet the requirements of practical application, a number of studies have focused on how to improve PICS efficiency and photoresponse window, which depend on the shape and size of metal nanoparticles, the interparticle distance, and the contact area between metal and TiO2
Summary
Photoelectrodes based on plasmonic Au semishell (or halfshell) arrays are developed. A colloidal crystal consisting of SiO2@TiO2 core-shell particles is prepared on a TiO2-coated transparent electrode. Plasmon-induced charge separation at two-dimensional gold semishell arrays on SiO2@TiO2 colloidal crystals A Au semishell (or halfshell) array is deposited by sputtering or evaporation on the colloidal crystal.
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