掺杂Ag对溶胶-凝胶法制备TiO2薄膜微晶结构与光学性能及光催化性能的影响  

Effect of Ag Doping on Microstructure, Optical Properties and Photocatalytic Activity of TiO2 Thin Films Prepared by Sol-gel Method

作　　者：徐晓壮 涂洁磊 孙晓宇 颜平远 宋冠宇 张炜楠 XU Xiaozhuang;TU Jielei;SUN Xiaoyu;YAN Pingyuan;SONG Guanyu;ZHANG Weinan(School of Energy and Environment Science,Yunnan Normal University,Kunming,650500,CHN)

机构地区：[1]云南师范大学能源与环境科学学院,昆明650500

出　　处：《固体电子学研究与进展》2020年第3期205-210,共6页Research & Progress of SSE

摘　　要：采用溶胶-凝胶法制备了TiO2和Ag掺杂的TiO2薄膜,不同的Ag掺杂浓度会形成不同的微观结构。当以较低摩尔浓度(<15%)掺杂Ag时,可以观察到微晶尺寸发生了变化,掺杂破坏了O—Ti—O键的同时形成诸如Ag—Ti—Ag键等其他化学键,与相应的纯锐钛矿膜相比,Ag掺杂减小了微晶尺寸,通过SEM成像可以观察到微晶尺寸的差异。这种晶体结构降低了TiO2的禁带宽度,增加了TiO2薄膜的透射率。Ag掺杂方便转移光生电子和空穴,降低了复合几率,有利于生成具有高光催化活性的O2-和·OH,显著提高TiO2材料的光催化性能。TiO2 and Ag-doped TiO2 film were prepared by sol-gel processing,different Ag doping concentrations led to different microstructure. When Ag is doped at a lower molar concentration(<15%),it can be observed that the crystallite size changes,and the doping destroys the O—Ti—O bond while forming other chemical bonds such as Ag—Ti—Ag bond. Compared with the corresponding pure anatase film,Ag doping reduces the crystallite size,and the difference in crystallite size can be observed by SEM imaging. This crystal structure reduces the band gap of TiO2 and increases the transmittance of the TiO2 film. Ag doping is convenient to transfer photogenerated electrons and holes,which is beneficial for the production of O2-and·OH with high photocatalytic activity,improving the photocatalytic performance of TiO2 materials significantly.

关 键 词：溶胶-凝胶法 锐钛矿 银掺杂 光催化 

分 类 号：D430.15[政治法律—政治学]