中文摘要：

采用层接层自组装技术,将多金属氧酸盐K6P2W18O62（多酸P2W18）和小分子物质甲基橙（Methyl Orange,MO）组装成复合膜材料.利用紫外-可见吸收光谱和扫描电子显微镜（SEM）、循环伏安扫描等手段对复合膜材料的形貌和电化学性能进行了表征和研究,使用电化学和UV-vis联机技术研究了复合材料的电致变色性能.结果表明：该复合膜呈现出淡黄色、浅蓝色到深蓝色的颜色调变,其光反差可达30.9%,着色效率高达53.4cm2/C,着色与褪色时间分别为2.4和3.1s;多酸和甲基橙复合膜材料具有良好的电致变色性能.

英文摘要：

A nanocomposite material based on K6P2W18O62（P2W18） and methyl orange was prepared by layer-by-layer （LbL） method. The morphology and electrochemical behavior of the composite film were investigated by UV-visible spectra （UV-vis）, scanning electron microscopy （SEM） and cyclic voltammograms （CV）. The electrochromic properties of the film were characterized via chronoamperometric （CA） and spectroelectrochemistry. The composite film displays adjustable colors and undergoes transitions from light yellow to light blue, then to dark blue, resulting in an optical contrast of 30.9% and a coloration efficiency of 53.4 cm^2/C. Furthermore,the switching times were 2.4 s for coloration and 3.1 s for bleaching. Obviously,the composite film based on P2W18 and methyl orange displays enhaned electrochromic performance.