Abstract
TiO2 materials possessing not only photocatalytic but also electrochromic properties have attracted many research and development interests. Though WO3 exhibits excellent electrochromic properties, the much higher cost and water-sensitivity of WO3 as compared with the TiO2 may restrict the practical application of WO3 materials. In the present study, the feasibility of preparing nanocrystalline porous TiO2/WO3 composite thin films was investigated. Precursors of sols TiO2 and/or WO3 and polystyrene microspheres were used to prepare nanocrystalline pure TiO2, WO 3, and composite TiO2/WO3 thin films by spin coating. The spin-coated thin films were amorphous and, after heat treating at a temperature of 500°C, nanocrystalline TiO2, TiO 2/WO3, and WO3 thin films with or without pores were prepared successfully. The heat-treated thin films were colorless and coloration-bleaching phenomena can be observed during cyclic voltammetry tests. The heat-treated thin films exhibited good reversible electrochromic behavior while the porous TiO2/WO3 composite film exhibited improved electrochromic properties.
Original language | English |
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Pages (from-to) | 228-233 |
Number of pages | 6 |
Journal | Thin Solid Films |
Volume | 494 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - Jan 3 2006 |
Externally published | Yes |
Keywords
- Electrochromic properties
- Porous thin films
- Sol-gel technique
- Spin coating
- TiO
- WO
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Metals and Alloys
- Materials Chemistry
- Surfaces, Coatings and Films
- Surfaces and Interfaces