| 纳米WO_3块体材料的电致变色效应 |
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| 引用本文： | 羊新胜,王豫,董亮,张锋,齐立桢.纳米WO_3块体材料的电致变色效应[J].物理学报,2004,53(8). |
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| 作者姓名： | 羊新胜 王豫 董亮 张锋 齐立桢 |
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| 作者单位： | 华中科技大学物理系,武汉,430074 |
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| 基金项目： | 国家自然科学基金，湖北省自然科学基金 |
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| 摘 要： | 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
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| 关 键 词： | WO3块材 纳米材料 电致变色 |
Electrochromic effect of nanostructured WO_3 bulk |
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| Yang Xin,Sheng,Wang Yu,Dong Liang,Zhang Feng,Qi Li,Zhen.Electrochromic effect of nanostructured WO_3 bulk[J].Acta Physica Sinica,2004,53(8). |
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| Authors: | Yang Xin Sheng Wang Yu Dong Liang Zhang Feng Qi Li Zhen |
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| Abstract: | WO 3 films are well known for the change of their color through electro , photo and thermo chromism. We report here that the nanostructured WO 3 bulk has an obvious electrochromic effect, which does not exist in ordinary WO 3 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 (W 5 ) 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 (W 6 ) in nanostructured WO 3 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. |
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| Keywords: | WO 3 bulk nanostructured materials electrochromic |
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