论文部分内容阅读
研究了贵金属Ag修饰对新型半导体BiOCl薄膜材料光催化性能的影响。采用溶胶-凝胶浸渍提拉法先在ITO玻璃上制备了BiOCl薄膜。以其为基底用磁控溅射方法沉积少量的Ag制备Ag/BiOCl复合纳米薄膜。分别研究了不同沉积时间和溅射气压,以及后处理温度下获得的Ag/BiOCl薄膜对罗丹明B(Rh B)染料在紫外光下的光催化降解活性。结果发现适量的Ag修饰能够提高BiOCl薄膜的光催化活性。通过实验探索,当制备金属Ag的优化参数为溅射压强1 Pa,溅射时间1 s,后处理温度200℃,时间1 h时获得的Ag/BiOCl复合纳米薄膜具有最好的光催化性能。用XRD,SEM,UV-Vis光谱等测试方法对其结构、形貌、光谱吸收性等进行了测量分析。进一步探讨了适量贵金属沉积对BiOCl薄膜光催化活性提高的可能原因,杂质能级形成的肖特基势垒对电子有捕获陷阱作用从而增加电子-空穴对的分离,同时利于光生载流子的重新分布。
The effect of Ag modification on the photocatalytic activity of novel semiconductor BiOCl films was investigated. BiOCl thin films were prepared on ITO glass by sol-gel dip-coating method. Ag / BiOCl composite nanofilm was prepared by depositing a small amount of Ag by magnetron sputtering method. The photocatalytic activity of Ag / BiOCl thin films on the photocatalytic degradation of rhodamine B (Rh B) dye under UV light was investigated at different deposition time, sputtering pressure and post-treatment temperature. The results showed that a suitable amount of Ag modification can improve the photocatalytic activity of BiOCl film. Through experimental exploration, Ag / BiOCl composite nanofilm obtained with the optimum parameters of Ag as sputtering pressure 1 Pa, sputtering time 1 s, post-treatment temperature 200 ℃ and time 1 h has the best photocatalytic activity. The structure, morphology, spectral absorption and so on were measured by XRD, SEM and UV-Vis spectroscopy. The possible reason for the increase of the photocatalytic activity of BiOCl thin films deposited with a suitable amount of precious metal is also discussed. The Schottky barrier formed by impurity level can trap the electrons and increase the separation of electron-hole pairs, Redistribute