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J. Phys. Chem. B 2001, 105, 960-966
Semiconductor-Metal Nanocomposites. Photoinduced Fusion and Photocatalysis of Gold-Capped TiO2 (TiO2/Gold) Nanoparticles Amy Dawson† and Prashant V. Kamat* Notre Dame Radiation Laboratory, Notre Dame, Indiana 46556-0579 ReceiVed: September 16, 2000
Semiconductor/metal composite nanoparticles have been synthesized by chemically reducing HAuCl4 on the surface of preformed TiO2 nanoparticles. These gold-capped TiO2 nanoparticles (particle diameter 10-40 nm) were stable in acidic (pH 2-4) aqueous solutions. At low [TiO2]:[Au] ratio (
