Aqueous precursors for electrochromic tungsten oxide hydrates

被引：111

作者：

Livage, J

Guzman, G

机构：

[1] Chime de la Matière Cond., Univ. Pierre et Marie Curie, 75252 Paris

来源：

SOLID STATE IONICS | 1996年 / 84卷 / 3-4期

关键词：

tungsten oxide hydrates; thin films; aqueous precursors; sol-gel synthesis;

D O I：

10.1016/0167-2738(96)00018-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Tungsten oxide hydrates WO3 . nH(2)O are formed upon the acidification of tungstate aqueous solutions. Different amorphous or crystalline phases can be obtained depending on the experimental conditions (pH, concentration, temperature). The chemical mechanisms for the formation of these hydrates are discussed and the electrochromic properties of thin films deposited from these solutions are described. Hydrogen peroxide H2O2 reacts with tungstic acid H2WO4, leading to the formation of peroxo species. These new precursors are more stable preventing the rapid precipitation of WO3 . nH(2)O. Moreover, this process allows the formation of mixed WO3-TiO2 precursor solutions. Transparent amorphous thin films are deposited by spin or dip-coating. They exhibit longer lifetime upon coloration-bleaching electrochromic cycling.

引用

页码：205 / 211

页数：7

共 29 条

[1] ELECTROCHROMISM OF COLLOIDAL TUNGSTEN-OXIDE [J].