【摘要】 采用电子束沉积技术在石英玻璃、硅片基板上沉积了TiO₂薄膜,利用热蒸发技术在TiO₂薄膜表面沉积了不同厚度的Ag膜,研究了Ag膜厚度对TiO₂薄膜结构、形貌、光学和光催化性能的影响。利用紫外-可见分光光度计（UV-VIS）、X射线衍射仪（XRD）、冷场发射电子显微镜（SEM）对沉积后的薄膜分别进行光学、结构、形貌分析。利用能谱仪测定了元素成分及含量。用光催化降解亚甲基橙（MO）的速率评价了合成的Ag-TiO₂的光催化性能。结果表明:Ag纳米粒子在TiO₂表面均匀分布;制备的Ag修饰多孔TiO₂纳米薄膜具有优异的光催化性能。测试结果表明:在250℃下制备的TiO₂薄膜为无定形结构;随着Ag膜厚度的增加,样品的光催化活性提高。当Ag膜厚度为3.7 nm时,光催化活性最高;与纯TiO₂相比,Ag-TiO₂具有更高的光催化活性。更多还原

【Abstract】 TiO₂ films were deposited employing electron beam evaporation technique on fused silica and Si substrates and silver nanoparticles with different thicknesses were deposited on TiO₂ films surface by thermal evaporation technique.The effect of Ag thickness on the structural,morphological,optical and photocatalytic properties of the nanocomposite thin films was investigated,and these properties were obtained by UV-Vis spectrophotometer,X-ray diffraction（XRD）,scanning electronmicroscopy（SEM）,respectively.The composition and content of elements were determined by energy dispersive spectrometer.The photocatalytic performances of the as-synthesized Ag-TiO₂ were evaluated in terms of their photodegradation rate of methyl orange（MO） in an aqueous solution under light.The results show that the Ag nanoparticles are well dispersed on porous TiO₂ surface.The as-prepared Ag-decorated porous TiO₂ films exhibits excellent photocatalytic properties.The results indicate that the as-deposited Ag-TiO₂ thin films are amorphous.It indicates that photocatalytic activity of the samples is enhanced with the thickness of Ag increased until reach to 3.7 nm.The Ag-TiO₂ films show an enhanced photocatalytic activity compared with pure TiO₂ films.更多还原