掺有TiO_2及纳米Ag的WO_3薄膜的电致变色研究

Preparation and Characterization of WO_3 Thin Films Doped with TiO_2 and Ag Nano Layer

采用真空蒸镀的方式制备了电致变色氧化钨薄膜,采用直流磁控溅射方法镀制了银层,采用电子束蒸发以插入层及共生的方式对氧化钨薄膜进行二氧化钛掺杂。使用UV757CRT紫外可见分光光度计测量了各样品随时间变化的透射率光谱。在CHI604C电化学工作站上进行了电化学测试,致色过程中进行了原位的光谱测量。使用原子力显微镜(AFM)和扫描电镜(SEM)观察了复合氧化钨薄膜的形貌。实验结果表明共生复合薄膜具有良好的环境稳定性,掺有银纳米层的复合薄膜与基底附着紧密,结构稳定,致色效率相对单层氧化钨薄膜平均提高了52.85%,漂白态和着色态的透射率差值达到了87.64%(λ=600nm,致色时间20s)。

Tungsten-oxide thin films have been prepared by doped silver and titania in the manner of layers or symbiosis, respectively. Morphology and static optical properties of the composite films have been investigated by means of scanning electron microscope （SEM） and atomic force microscope （AFM）, ultraviolet-visible spectrophotometer （UV757CRT） respectively. Chronoamperometry （CHI604C） is carried out and spectral measurements are performed in situ when films are tested. Results show that the films are good in adhesion to substrate. They have relatively compact structure and high coloration efficiency, improved by an average of 52.85% compared with the original tungsten-oxide thin films, and the variation of transmittance （bleached/colored） can reach 87.64% （λ=600 nm, colored time 20 s）.