期刊
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
卷 37, 期 -, 页码 3-8出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2014.12.033
关键词
Gold nanoparticle; Raman spectroscopy; SERS; Photocatalysis; TiO2
类别
资金
- State Fund for Fundamental Research of Ukraine [F41.2/005, F54.3/007, F54.1/013]
- Alexander von Humboldt Foundation
Photocatalytic reduction of NaAuCl4 by ethanol on the surface of mesoporous TiO2 films illuminated by UV light results in the formation of nanocrystalline TiO2/Au heterostructures with an average size of gold nanoparticles varying in a range of 20-60 nm depending on the photoprocess conditions. Raman spectra of the TiO2/Au heterostructures excited in the surface plasmon resonance bands of the Au nanoparticles were obtained. The TiO2/Au films pre-illuminated with relatively high power density of the laser beam used in Raman experiment (100 W/cm(2)) exhibit plasmonic enhancement of Raman scattering by titania excited subsequently with relatively low-intensity (10 W/cm(2)) laser light. This effect sheds some light on the mechanistic aspects of plasmonic photocatalysis observed for many gold-based metal-semiconductor heterostructures. (C) 2014 Elsevier Ltd. All rights reserved.
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