溶胶-凝胶电泳WO_3膜的电致变色特性

THE ELECTROCHROMIC PROPERTIES OF SOL-GEL ELECTROPHORESIS FILM WO_3

采用溶胶-凝胶电泳法制备非晶态WO_8电致变色膜,经过适当条件热处理后,由于H^+(或/和Li^+)离子和电子的双注入,该膜能呈现无色至深蓝色的电致变色效应。其性能为:对应于响应时间t_(res)≈1S时,变色对比度C_R>2:1;开路存贮时间τ_(?)≈64h;变色循环寿命n≈8×10~4次。实验在C/二甲基亚砜+LiClO_4(液体电解质)/WO_8/ITO构成的可逆电池中进行。 讨论了热处理条件、试验电压、膜厚等对胶体膜结构、含水量、光密度变量、循环寿命、着色可逆性及保持特性的影响。

The noncrystalline film WO _8by sol-gel electrophoresis has been described in this paper. The film can be dyed in dark-blue from almost transparent when the ions H^+(and/or Li^+) and electrons are double injected into it after an appropriate heat-treatment. Its electrochromic properties are: colour constrast C_R≈2:1 for response timo t_(res=1S,signal storage time at open circuit t_?=64h, and cyclic lifetime n=8×10~4 times. The experiments are carried out in a reversible bartery constructed by carbon/2 methy sulph-oxide+LiClO_4(liquid electrolyte)/WO_3/ITO. The effects of heat-treatment conditions, testing voltage, and film thickness on the structure, water content, optical density variable, cyclic lifetime, colour reversibility and signal keeping characteristics of such film are also discussed.