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无机材料学报

无机材料学报

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WO3薄膜的动态电变色特性

王忠春; 胡行方   

  1. 中国科学院上海硅酸盐研究所; 上海 200050
  • 收稿日期:1997-11-25 修回日期:1998-02-18 出版日期:1998-12-20 网络出版日期:1998-12-20

Dynamic Coloration Properties of Spin-coated WO3 Thin Films

WANG Zhong-Chun; HU Xing-Fang   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1997-11-25 Revised:1998-02-18 Published:1998-12-20 Online:1998-12-20

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摘要： 本文以H2WO4和H2O2为原料，采用溶胶-凝胶法成功地制备了WO3电色薄膜．经150℃处理的薄膜在循环伏安条件下的动态着色、消色效率分别为100、86cm2／C（第10个循环），在633um处δT达50％以上．经350℃处理的薄膜稳定性大大提高了，但其变色幅度却较小．采用恒电量法（10mC／cm2）对薄膜进行电化学循环测定表明，薄膜的可逆性及循环寿命相对于循环伏安法大大提高，这是因为此法避免了对表面层的过度注入．

关键词: WO3, 电致变色, 光学性质, 循环伏安法, 溶胶-凝胶

Abstract: WO3 thin films were fabricated on ITO glass substrates by the spin-coating technique using H2WO4 and H2O2 as precursors. The films annealed at 150℃ for 1h show dynamic coloration and bleaching efficiencies of 10.0,
8.6 cm2/C respectively at 633nm during cycling between --1 and +1V (vs. SCE) in LiClO4/PC at the scan rate of 20mV/s. The films annealed at 350℃ show improved cycling stability while losing some efficiency.
The films annealed at 150℃　have also been electrochemically cycled by a constant current charge injection, which is found to be more easy to control
the amount of charge injected into the films, and avoid overcharging the films, especially the surface layer.

Key words: WO3, electrochromism, optical properties, cyclic voltammetry, sol-gel

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