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-  2015 

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

Keywords: 二氧化钛(TiO2),Ag纳米颗粒,局域表面等离激元

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Abstract:

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

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