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Structure and electrical properties of tungsten oxide hydrate amorphous thin film

水合氧化钨非晶薄膜的结构与电学性能

基本信息

批准号：
02650575
负责人：
KUDO Testuichi
金额：
$ 1.28万
依托单位：
Institute of Industrial Science, University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

An amorphous thin film can easily be fabricated by the spincoating technique using a solution of peroxo-polytungstic acid(WIPA), which is formed by the direct reaction of metallic tungsten with hydrogen peroxide. Amorphous W0_3・nH_20 given by heating such a film at 100-160ﾟC exhibits good and stable electrochromism similar to that of conventional evaporated WO_3 films. We examined the dynamics of coloration of those coated films on a newly developed analytical basis. The coloration dynamics was investigated by measuring the transition current when a sudden downward step of the potential was applied to a sample. The current didn't follow the Cottrell-type time dependency, which suggest the rate is noi controlled* by diffusion. The time dependency of current can. be explained by a Butler-Volmer type relationship, hence the dynamics was revealed to be controlled by the charge transfer step.Tantalum and Niobium based amorphous solids were prepared. by drying respective peroxo polyacids. Alternating current electrical conductivity measurement's were carried out with pellet samples. Each specimen showed similar temperature dependency indicating its proton conductive mechanism was the same. The conductivity of Ta-IPA solid was larger than those of the others. Conduction mechanisms are discussed in relation to the water content and the structure of these materials.Amorphous thin films Of MoO_3・nH_2O and (Mo, W) O_3・nH_2O are fabricated by the spin-coating technique from peroxopolymolybdate and peroxo-polytungstomolybdate solutions. Some fundamental electrochromic properties of these films were investigated in LiClO_4/propylenecarbonate solution. The colored films derived from MO-IPA exhibited stronger and flatter visible absorption spectra than tungsten-based film.

通过旋涂技术，使用过氧聚钨酸（WIPA）溶液可以容易地制备非晶薄膜，过氧聚钨酸（WIPA）溶液通过金属钨与过氧化氢的直接反应形成。在100-160 ℃下加热得到的非晶WO_3·nH_20具有与常规蒸发WO_3薄膜相似的良好和稳定的电致变色性。我们研究了动态的着色这些涂层膜上一个新开发的分析基础。显色动力学进行了研究，通过测量的过渡电流时，突然下降的电位阶跃施加到一个样品。电流不遵循Cottrell型时间依赖性，这表明速率是由扩散控制的。电流的时间依赖性可以。用Butler-Volmer型关系解释，因此动力学过程是由电荷转移步骤控制的。通过干燥相应的过氧多酸。用颗粒样品进行交流电导率测量。每个样品显示出相似的温度依赖性，表明其质子传导机制是相同的。Ta-IPA固体的电导率比其他固体的电导率大。用旋涂法从过氧杂多酸盐和过氧多钨钼酸盐溶液中制备了MoO_3·nH_2O和（Mo，W）O_3·nH_2O非晶薄膜。在LiClO_4/丙烯酰胺溶液中研究了这些薄膜的电致变色性能。MO-IPA着色膜的可见光吸收光谱比钨基着色膜更强、更平坦。