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

摘要： 采用紫外光还原法和种子法制得了不同含量Ag纳米粒子负载的锐钛矿型TiO2纳米带复合材料。用各种测试技术对产物的物相、形貌、Ag负载情况以及SERS性质进行了一系列表征。测试结果表明，以紫外光还原法获得的产物中Ag完全负载在TiO2纳米带表面，其粒径主要处在10～50 nm间，且Ag负载量随着还原次数增多而缓慢增加。在此基础上，以种子法制得的产物中Ag负载量则显著增大，覆盖率可达80 %以上。这种含Ag纳米复合材料具有检测吡啶分子的SERS活性，其Ag负载量越多，SERS效应越明显。

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