Research Progress in Gasochromics Mechanism of Tungsten Oxide Thin Films

The gasochromic effect and its potential applications of tungsten oxide (WO 3 ) thin films are introduced. The research progress in gasochromics mechanism of WO 3 films is reviewed and various mechanism models are summarized and discussed. The double injection model, oxygen vacancy diffusion model and localized water molecules model are extensively used to explain the gasochromic coloration of WO 3 films. A perspective on the gasochromics mechanism development of WO 3 films is tended to fabricate WO 3 film with single crystal and regular structure, which may simply the quantitative characterizations induced by the complicated structure. Elucidating gasochromics mechanism of WO 3 films not only helps to understand gasochromic coloration phenomenon well but also improves the performance of gasochromic coloration devices. It also accelerates the development of the relative science, such as gas detector, atom/ion transport material, surface catalysis of semiconductor, and so on.