Journal
LANGMUIR
Volume 18, Issue 11, Pages 4191-4194Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la020099i
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The aim of this study is to prepare Au clusters with a mean size (d) of less than 3.0 nm, at which nonmetallic properties can be expected to appear. Au clusters (d < 3.0 nm) have been formed rapidly (<2 min) on TiO2 surfaces by a two-step method consisting of Au(III)-complex chemisorption and subsequent photoreduction (lambda(ex) > 300 nm) at temperatures below 25 degreesC. In the photoreduction of the Au(III) complex to Au-0, chemisorbed and physisorbed H2O on the TiO2 surface acts as a reductant. This method also enables us to produce Au clusters selectively at the UV-irradiated TiO2 surfaces.
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