关键词: 紫外光还原, 种子法, TiO2纳米带, Ag纳米粒子, 表面增强拉曼效应

Abstract: A series of Ag-deposited anatase TiO2 nanobelts with different Ag content were prepared using ultraviolet-light reduction or/and seeding growth proceeding. The structure, morphology, Ag-deposition and SERS properties of the products were measured by various techniques. The measurement results show that the Ag nanoparticles reduced by ultraviolet-light, mainly in a diameter range of 10-50 nm, were deposited completely on the surface of TiO2 nanobelts, and the Ag content slowly enhances with the increase of reduction times. Based on the product, the nanocomposite with much more Ag content and coverage above 80 % was further obtained through seeding growth of Ag nanoparticles. The products remarkably exhibit surface-enhanced Raman scattering (SERS) activities using pyridine as a probe molecule, and the more Ag nanoparticles are, the stronger SERS signal is.

Key words: ultraviolet-light reduction, seeding growth, TiO2 nanobelts, Ag nanoparticles, SERS effect