a 复杂煤气层瓦斯抽采国家与地方联合工程实验室 重庆大学煤矿灾害动力学与控制国家重点实验室 重庆大学资源及环境科学学院 重庆 400044;
b 重庆大学自动化学院 重庆 400044
TeO2-SiO2/α-TeO2 Composite Film Prepared by Electrochemical sol-gel Method and Its Non-linear Optical Properties
Li Qianga, Gu Mina, Du Yunguia, Xian Xiaodongb
a State and local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, College of Resources and Environmental Science, Chongqing University, Chongqing 400044;
b College of Automatization, Chongqing University, Chongqing 400044
Abstract：Stable TeO2-SiO2 composite sol was prepared by using tellurium isopropoxide and tetraethoxysilane as precursors. A black composite film was prepared by electrochemical sol-gel method using the as-prepared TeO2-SiO2 composite sol as electrolyte, and then was transferred into a gray and semitransparent composite film by further thermo treatment. Characterized by XRD, TG-DTA and SEM-EDX, the thin composite film was identified to be composed of Si, Te and O elements as the main components, and α-TeO2 particles and a small amount of Te particles were found to be dispersed uniformly in the TeO2-SiO2 gel composite film. The third-order nonlinear optical properties of the film was tested by Z-scan method, revealing that the third-order nonlinear optical susceptibility χ(3) was 2.171×10-14 (m·V-1)2.