【摘要】 本文以同多酸钨为浸涂液主要原料,采用溶胶-凝胶法制备了WO₃·xH₂O（x=0.2～1.3）非晶态薄膜.探讨了胶态钨酸在溶胶-凝胶转变过程中性质和结构的变化。扫描电镜表明,非晶态氧化钨膜是疏松多孔的。同时,X射线光电子能谱证实,非晶态WO₃膜表层中O^2-/W⁶⁺比为2.93。可以认为其网络结构是由[WO₆]八面体以共角和共边方式联结.其间隙为三、四或六边形的隧道,这一结构特征对Li⁺的快速扩散是重要的。 结果表明,非晶态氧化钨薄膜在SnO₂:Sb|WO₃|LiClO₄-PC|Li_xWO₃|SnO₂:Sb电色器件中可显示良好的电变色特性。更多还原

【Abstract】 Amorphous WO₃.xH₂O （x=0.2～1.3） electrochromic films have been prepared by the sol-gel method using isopolytungstic acid as the main starting material in the dip-coating solution. The variation in the properties and structure of colloidal tungstic acid during sol-gel trans-formation is investigated.SEM photographs show that only amorphous WO₃ films are microporous. XPS confirms that the O^2-/W⁶⁺ ratio near the surface of amorphous WO₃ film is 2.93, which means the network structure of the film can be considered to be formed by WO₃ octahedra linked by common edges and corners with channels of hexagonal as well as triangular and quadrangular shapes, which allow rapid ionic diffusion in a long distance.The results show that the amorphous WO₃ film in the electrochromic device of SnO₂:Sb|WO₃|LiClO₄-PC|Li_?WO₃|SnO₂:Sb can appreciably exhibit the electrochromism.更多还原