局域表面等离激元效应增强TiO₂-SiO₂-Ag复合薄膜光催化性能

局域表面等离激元效应增强TiO 2 -SiO 2 -Ag复合薄膜光催化性能 Enhanced Photocatalytic Efficiency of TiO 2 -SiO 2 -Ag Nanocomposites Induced by Localized Surface Plasmonic Effect 徐进霞 XU Jinxia 1 2 first-author 李珊 LI Shan 1 2 周远明 ZHOU Yuanming 1 2 梅菲 MEI Fei 1 2 刘凌云 LIU Lingyun 1 2 湖北工业大学电气与电子工程学院 湖北工业大学电气与电子工程学院 School of Electrical and Electronic Engineering,Hubei University of Technology School of Electrical and Electronic Engineering,Hubei University of Technology 湖北工业大学太阳能高效利用湖北省协同创新中心 湖北工业大学太阳能高效利用湖北省协同创新中心 Hubei Collaborative Innovation Center for High-Efficient of Solar Energy,Hubei University of Technology Hubei Collaborative Innovation Center for High-Efficient of Solar Energy,Hubei University of Technology 用高纯度的Ag靶,采用直流溅射法在石英衬底上通过退火处理,得到Ag纳米颗粒薄膜;然后通过射频溅射法在Ag纳米颗粒上沉积不同厚度的SiO2隔离层,再通过直流反应溅射在SiO2隔离层上沉积TiO2薄膜（膜厚60nm）,得到TiO2-SiO2-Ag复合薄膜.对样品进行了紫外-可见吸收光谱、拉曼散射光谱、扫描电子显微镜及光催化性能研究.研究结果表明,TiO2-SiO2-Ag复合薄膜结构由于Ag纳米颗粒的局域表面等离激元效应,而与入射光场耦合,使TiO2对紫外光的吸收增强,从而增加了电子-空穴对的产生率,表现出较TiO2更强的光催化性能;通过调节SiO2的厚度可以调控Ag纳米颗粒的局域表面等离激元与TiO2的相互作用,从而提高TiO2的光催化性能. TiO2-SiO2-Ag nanocomposites were fabricated by depositing TiO2 films on SiO2 layer embedded with Ag nanoparticles by means of magnetron sputtering and then subsequent rapid thermal annealing（RTA）,and investigated by UV-vis-NIR dual-beam spectrometer,Raman spectrum,scanning electron microscopy（SEM）and the photocatalytic efficiency.The nanocomposites show higher photocatalytic efficiency compared with the pure TiO2 film due to enhancement of light absorption.The enhanced light absorption originated from the near-field enhancement caused by the plasmonic effect of Ag nanoparticles.The enhancement of the photocatalytic efficiency of TiO2 could be adjusted by changing the thickness of the SiO2 protective layer from 0to 20 nm to control the surface plasmonic effect of Ag nanopaticles. 二氧化钛（TiO2） Ag纳米颗粒 局域表面等离激元 TiO2 Ag nanoparticles localized surface plasmon 10.14188/j.1671-8836.2015.01.012 O484.41 国家自然科学基金（11305056）;湖北省自然科学基金（2013CFB028）;湖北省教育厅科学研究计划（Q20131404）资助项目 2015-01-01 2021-03-31 1 61