【作者】 高广刚；

【导师】 许林；

【作者基本信息】 东北师范大学 ， 无机化学， 2005， 硕士

【摘要】 电致变色薄膜以其在军事伪装、智能调光窗、后视镜、高对比度信息显示器以及卫星热能控制领域具有广泛的应用前景而引起人们的广泛关注。多金属氧酸盐(简称 POMs)是一类无机金属氧化物构成的簇合物并且通常具有可逆的氧化还原性质。在外界电压存在的条件下多金属氧酸盐可以被还原或氧化,还原时大多数呈现蓝色,因此可以利用外加电压的变化使多金属氧酸盐处于还原或氧化状态而实现电致变色。如果选择合适的方法将多金属氧酸盐构筑到导电基底中则会得到具有电致变色性质的功能器件。近年发展起来的层接层自组装(LbL)方法,最初产生于一对相反电荷聚电解质的静电吸附,是一种简单而通用的技术,并且具有制备大面积超薄膜的应用潜力。由于制备过程中膜的每一层的厚度、膜间组分的组成都是可控的,LbL 技术提供了在分子设计水平上制备多样性有序结构的方法,这一方法在开发各种材料的器件应用上具有明显的优势。多金属氧酸盐的阴离子通常承载着一定数量的负电荷,因此适合于利用 LbL 技术制备基于多酸阴离子的电致变色纳米复合膜材料。本文利用层接层自组装方法制备了基于不同类型多酸阴离子的电致变色复合膜,并详细的研究了电致变色的机理及影响因素。更多还原

【Abstract】 Electrochromic film has attracted much attention due to the potential application in military disguise, smart windows, rear view mirror, high contrast display and the thermal control of satellites. Polyoxometalates (POM), a class of molecularly defined inorganic metal-oxide cluster usually represents reversible redox activity. POMs can be reduced or oxidized by applying voltage and most of them display blue color in the reduced state. Thus, there should be suitable method to fabricate POMs into conducting matrix for the further electrochromic devices. In recent years, the fabrication of layer by layer self-assembled ultra-thin film has attracted considerable interest in view of their importance to nanomaterials with tailored structures and properties. The layer-by-layer (LbL) self-assembly method, initially developed for pairs of oppositely charged polyelectrolytes, is a facile and versatile technique that has lately emerged as a viable approach to prepare large area ultra-thin films. Because the composition, thickness, and components of each layer in the film can be controlled, the LbL technique provides a route to fabricate various regular structures at the molecule level, which offers potential advantages for device application. Obviously, polyanions are suitable to the LbL method due to containing negative charge. Herein, to investigate new inorganic-organic electrochromic film based on polyoxometalate anions, the electrochromic films based on polyoxometalate were prepared by LbL self-assembly method and the electrochromic properties were explored in detail.更多还原