Ambient Light Reduction Strategy to Synthesize Silver Nanoparticles and Silver-Coated TiO 2 with Enhanced Photocatalytic and Bactericidal Activities
2003; American Chemical Society; Volume: 19; Issue: 24 Linguagem: Inglês
10.1021/la035330m
ISSN1520-5827
AutoresLizhi Zhang, Jimmy C. Yu, Ho Yin Yip, Quan Li, Kwan Wai Kwong, An‐Wu Xu, Po Keung Wong,
Tópico(s)Advanced Photocatalysis Techniques
ResumoUnder ambient light illumination, silver nanoparticles can be synthesized by a triblock copolymer induced reduction of [Ag(NH3)2]+ ions in ethanol. Conventional chemical reducing agents, thermal treatment, and radiation sources are no longer necessary in this novel approach. A possible mechanism was proposed to explain the formation and stabilization of silver nanoparticles based on UV−vis absorption spectra and transmission electron microscopy results. This novel ambient light route has been successfully applied to deposit silver nanoclusters on TiO2. Silver nanoclusters of about 2 nm in size were found to strongly anchor to the TiO2 nanoparticles with high dispersion. The resulting silver-coated TiO2 material with optimal silver loading showed enhanced photocatalytic and bactericidal activities compared to the uncoated TiO2. The reasons for the enhancements of the activities were discussed.
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