膜厚对Ag-TiO2薄膜光学性能和光催化性能影响的研究

Effects of film thickness on optical performance and photocatalytic ability of Ag-TiO_2 thin films

采用电子束沉积方法制备了Ag-TiO_2光催化剂,采用电子扫描显微镜(SEM)、X射线衍射仪(XRD)、透射电镜(TEM)、紫外-可见(UV-Vis)光谱仪和原子力显微镜(AFM)等手段对薄膜的形貌、物相组成,吸收光谱和粗糙度进行了表征。利用太阳光,以甲基橙(MO)为模拟污染物,考察光催化剂的光催化活性,探讨了薄膜厚度对光催化效率的影响。结果表明,在300℃温度下,所形成的薄膜为无定形结构;当薄膜厚为570nm时,降解40days后,MO的降解率达到55%。

In this study, Ag-TiO2 films were fabricated by electron beam evaporation.The as-prepared composite Ag-TiO2 films are characterized by scanning electron microscopy （SEM）, transmission electron microscope （TEM）,X-ray diffraction （XRD）, atomic force microscopy （AFM） and UV-Vis spectrometer to determine the morphology, phase components, absorption spectrum and roughness, respectively. With methyl orange as the model pollutant, the photocatalytic activity is studied to investigate the influence of film thickness on the photocatalysis under the sunlight. The research results indicate that the Ag-TiO2 films are amorphous at 300℃ and the degradation rate of MO reaches 55% for 40 days when the film thickness is 570 nm.