期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 15, 页码 7007-7013出版社
AMER CHEMICAL SOC
DOI: 10.1021/am401252h
关键词
TiO2; Keggin ions; bimetallic nanoparticles; SERS; photocatalysis
资金
- Australian Research Council (ARC) [DP0988099, DP110105125, LP100200859, LE0989615, LE110100097]
- Ian Potter Foundation
- Australian Research Council [LE110100097] Funding Source: Australian Research Council
While the decoration of TiO2 surfaces with metal nanoparticles has been well-established, the modification of the composition of metal nanoparticles postdeposition onto TiO2 surfaces and applicability of such bimetallic systems for surface enhanced Raman scattering (SERS) and photocatalysis has not hitherto been investigated. In this work, we, for the first time, combine the unique UV-switchability of the Keggin ions of 12-phosphotungstic acid (PTA) to directly form metal nanoparticles (Ag and Cu) onto the colloidal TiO2 surface, with a galvanic replacement process to convert these predeposited metal nanoparticles into bimetallic systems (Ag/Au, Ag/Pt, Cu/Au, Cu/Pt, and Cu/Ag). We further demonstrate the applicability of these novel TiO2-polyoxometalate-bimetal nanocomposites toward improved SERS and solar light photocatalysis.
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