In order to improve electrochromic properties of tungstic oxide(WO3)thin film,WO3 electrochromic thin film doped with polyvinyl alcohol (PVA) was prepared by peroxopolytungstic acid sol-gel method.Microstructure of the film was observed by metallographic microscope.Light transmittance and characteristics of cyclic voltammetry of the film were investigated by UVPC and CHI,relatively.Results indicated that addition of a certain amount of PVA can make the film structure more even and chromatism more uniform;adjustable range of color change increased while the difference value of light transmittances in colored - and bleached - states was more than 60%;electrochromic reversibility and spectral properties were both improved comparing with those without doping.%为改善三氧化钨薄膜的电致变色性能,采用钨粉过氧化聚钨酸溶胶-凝胶法制备了添加聚乙烯醇的三氧化钨电致变色薄膜.采用扫描电镜、紫外可见分光光度计和CHI电化学工作站分别测定和分析了三氧化钨薄膜的微观结构、光透过性能和循环伏安特性.结果表明,添加一定量的聚乙烯醇可使薄膜的结构更加平整,变色更为均匀;在着色态、褪色态下的光透过率之差达到60%以上,变色可调范围变大.电致变色可逆性能和光谱性能较不添加聚乙烯醇有所提高.
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