为改善氧化钨薄膜的电致变色性能，通过溶胶凝胶法钨粉过氧化路线制备了聚乙二醇改性的氧化钨电致变色薄膜。采用X射线衍射仪、光谱椭偏仪、紫外可见分光光度计和电化学工作站对薄膜的微观结构、光谱调制能力、着色效率、离子扩散能力、可逆性和响应时间及循环稳定性进行了表征和分析，并研究了聚乙二醇对氧化钨薄膜结构及电致变色性能的影响。结果表明，聚乙二醇可以使氧化钨薄膜结晶延迟；添加一定量的聚乙二醇可以得到纳米晶/非晶复合结构薄膜，从而更有利于离子在薄膜中的扩散与迁移；相对于未添加聚乙二醇改性的氧化钨薄膜，聚乙二醇改性的薄膜具有更宽的光谱调制范围和更高的着色效率，亦表现出良好的可逆性和循环稳定性。

In order to improve electrochromic properties of tungsten-oxide (WO3) thin films, polyethylene glycol (PEG)-doping WO3 films are prepared by peroxopolytungstic acid sol-gel method. Microstructure, optical and electrochromic properties of the films are investigated by X-ray diffraction, spectral ellipsmetry, ultraviolet-visible spectrophotometer and cyclic voltammetry, respectively. Results show that PEG-doping tungsten-oxide films contain nanocrystalline/amorphous nanostructure, which facilitate ions transport in the films. Compared to pure WO3 film, the PEG-WO3 film possesses wider spectral modulation, higher coloring efficiency, good electrochromic reversibility and cyclic stability.