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纳米WO3块体材料的电致变色效应

羊新胜 王 豫 董 亮 张 锋 齐立桢

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纳米WO3块体材料的电致变色效应

羊新胜, 王 豫, 董 亮, 张 锋, 齐立桢

Electrochromic effect of nanostructured WO3 bulk

Yang Xin-Sheng, Wang Yu, Dong Liang, Zhang Feng, Qi Li-Zhen
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  • WO3薄膜能够通过电、光、热变色.实验发现纳米WO3块材具有明显的常规块材不具有的电致变色特性,即当样品中有电流通过时,样品从负极到正极颜色由黄色变为深蓝色.变色前后样品的显微形貌和相结构都没有明显变化.x射线光电子能谱说明变色后的样品中出现了低价的钨离子(W5+).根据实验结果,变色过程被认为是一种电子注入效应.纳米样品中的高价钨离子(W6+)因为纳米材料的表面效应而具有足够大的活性,能与电子结合生成低价的离子,从而使样品变色.
    WO3 films are well known for the change of their color through electro, photo and thermochromism. We report here that the nanostructured WO3 bulk has an obvious electrochromic effect, which does not exist in ordinary WO3 bulk. The sample turns to a deep blue color upon changing from anode to cathode when external voltage is applied. There is no difference of the microstructure and phase structure between the colored and uncolored samples. X-ray photoelectron spectroscopy analysis shows that low valence state of tungsten ion (W5+) existed in the colored samples. Based on the experimental results, it is concluded that the coloration is an electron-injection effect. The high valence state of tungsten ion (W6+) in nanostructured WO3 bulk has enough activity to combine with electron and turns to the low valence state counterpart because of the surface effects of nanostructured materials. As a consequence, the sample changes its color.
    • 基金项目: 国家自然科学基金(批准号:50277015)和湖北省自然科学基金(批准号:2002AB053)资助的课题.
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  • 文章访问数:  6706
  • PDF下载量:  726
  • 被引次数: 0
出版历程
  • 收稿日期:  2003-11-05
  • 修回日期:  2004-01-07
  • 刊出日期:  2004-04-05

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