VO_2-WO_3复合薄膜的制备及其热致变色-电致变色性能研究

智能玻璃是目前建筑节能重点研究方向。本研究将自制氧化钒纳米粉体均匀分散到钨溶胶体系,取上清液旋涂于ITO基板,经干燥、退火后制得VO_2(M)-非晶WO_3复合薄膜。实验结果表明,所制备的VO_2(M)-非晶WO_3复合薄膜兼具热致变色和电致变色性能,通电后薄膜表现典型的电致变色特征,可见光和近红外光透过率明显下降。退火过程中,部分W掺杂到VO_2中,使薄膜的热致相变温度降低10°C左右。复合薄膜在双响应条件下,其可见光透过率为32.6%、调控效率为18.8%。

Preparation and Electrochromic-Thermochromic Properties of VO2-WO3 Composite Films

Smart glass is of importance for energy saving of building. In this study, self-made vanadium oxide nano-powders were uniformly dispersed into tungsten-sol, and the supernatant was spin-coated on ITO substrate. The film was dried at room temperature for 5 min, then dried at 100°C for 3 h, and finally annealed at 300°C for 10 min in air. The experimental results showed that the composite films have both the thermochromic and electrochromic properties. After power is turned on, the composite films exhibit typical electrochromic characteristics, and the visible and near-infrared light transmittance decrease significantly. During the annealing process, a part of tungsten element is doped into the VO2, and the thermally induced phase transition temperature of the composite film is reduce about 10°C. Under the double response condition, the visible light transmittance of the composite film is 32.6%, and the regulated efficiency is 18.8%.