Nanocrystalline TiO2/Au films: Photocatalytic deposition of gold nanocrystals and plasmonic enhancement of Raman scattering from titania
| Autor: | Oleksandr Stroyuk, Stepan Ya. Kuchmiy, Dietrich R. T. Zahn, Artur Ya. Breslavskiy, Alexander Villabona, Andriy V. Kozytskiy, Volodymyr Dzhagan |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Mechanical Engineering Physics::Optics Nanoparticle Condensed Matter Physics Photochemistry Nanocrystalline material Condensed Matter::Materials Science symbols.namesake Mechanics of Materials Colloidal gold symbols Photocatalysis General Materials Science Surface plasmon resonance Raman spectroscopy Plasmon Raman scattering |
| Zdroj: | Materials Science in Semiconductor Processing. 37:3-8 |
| ISSN: | 1369-8001 |
| DOI: | 10.1016/j.mssp.2014.12.033 |
| Popis: | Photocatalytic reduction of NaAuCl 4 by ethanol on the surface of mesoporous TiO 2 films illuminated by UV light results in the formation of nanocrystalline TiO 2 /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 TiO 2 /Au heterostructures excited in the surface plasmon resonance bands of the Au nanoparticles were obtained. The TiO 2 /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. |
| Databáze: | OpenAIRE |
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