Sonochemical deposition of nanosized Au on titanium oxides with different surface coverage and their photocatalytic activity
- Sonochemical deposition of nanosized Au on titanium oxides with different surface coverage and their photocatalytic activity
- Daniel Yang; 박상은; 이중기; 이상화
- Nanostructures; Growth from solutions; Metals; Titanium compounds; Photocatalyst
- Issue Date
- Journal of crystal growth
- VOL 311, NO 3, 508-511
- Different surface coverage of nanosized Au on the TiO2 matrix was simply fabricated in an ultrasounddriven cell by adjusting the loading volume of gold precursor. Non-annealed Au–TiO2 composites with low surface coverage of nanosized Au exhibited a significantly enhanced photocatalytic activity in comparison to pristine TiO2. However, a further increase of nanosized Au loading consequently led to a decrease of photocatalytic efficiency of Au-deposited TiO2, probably due to the reduction of available surface area for organic pollutant adsorption and light absorption. The X-ray photoelectron spectroscopy (XPS) analysis of Au-deposited TiO2 indicated the coexistence of metallic Auo and non-metallic Au species that might play a role as an electron scavenger. The reduction of photoluminescence (PL) intensity also indicated the efficient separation of electrons and holes even in Au–TiO2 composites without heat treatment.
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