NanoBiotechnology Research Lab, RMIT University, GPO Box 2476 V, Melbourne VIC 3001, Australia.
ACS Appl Mater Interfaces. 2013 Aug 14;5(15):7007-13. doi: 10.1021/am401252h. Epub 2013 Jul 25.
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.
虽然 TiO2 表面金属纳米粒子的修饰已经得到了很好的研究，但金属纳米粒子在沉积到 TiO2 表面后的组成修饰以及此类双金属系统在表面增强拉曼散射（SERS）和光催化方面的应用尚未得到研究。在这项工作中，我们首次将 12-磷钨酸（PTA）的 Keggin 离子的独特紫外光开关特性与电置换过程相结合，直接在胶体 TiO2 表面形成金属纳米粒子（Ag 和 Cu），并将这些预沉积的金属纳米粒子转化为双金属系统（Ag/Au、Ag/Pt、Cu/Au、Cu/Pt 和 Cu/Ag）。我们进一步证明了这些新型 TiO2-多金属氧酸盐-双金属纳米复合材料在提高 SERS 和太阳光光催化方面的适用性。
