Effect of citric acid on structure and photochromic properties of WO3-TiO2-ZnO composite films prepared by a sol-gel method

被引：22
作者：
Chen, Weilong [1 ]
Shen, Honglie [1 ,2 ]
Zhu, Xiangrong [3 ]
Xing, Zhengwei [1 ]
Zhang, Sanyang [1 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Jiangsu Prov Key Lab Mat & Technol Energy Convers, Nanjing 210016, Peoples R China
[3] Shanghai Second Polytech Univ, Sch Environm & Mat Engn, Coll Engn, Shanghai 201209, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2015年 / 41卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Citric acid; WO3-TiO2-ZnO composite films; Photochromism; Sol-gel method; TUNGSTEN; WO3; NANOPARTICLES; HYBRID;
D O I：
10.1016/j.ceramint.2015.06.093
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, WO3-TiO2-ZnO ternary composite films were successfully prepared by a sol-gel method using citric acid as the coordination agent. The effect of citric acid concentration in the precursor solutions on microstructure and photochromic properties of the composite films was characterized by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and a UV-vis-NIR spectrophotometer. Firstly, the citric acid improves the stability of the precursors and help to prepare homogeneous composited films. However, SEM observation indicates that the aggregation of the particles in the films occurrs when the concentration of citric acid is above 0.6 M. Secondly, all the samples preprared from the precursors with ctric acid present much better photochromism than the films with none citric acid in the precusors. Especially, the sample corresponding to 0.6 M citric acid displays best photochromism. Finally, for the sample corresponding to 0.6 M citric acid, the more detailed photochromic properties such as time dependence of UV-vis absorption and the bleaching absorption spectra were further investigated. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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收藏
页码：12638 / 12643
页数：6
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