MoO_3电致变色薄膜的XPS研究

近年来 ,随着人们提倡节能和使用洁净能源 ,无机电致变色材料在建筑物采光控制系统和反射率可调表面的应用研究 ,已成为材料领域的一个新热点 .WO3、 MoO3等过渡金属氧化物薄膜具有良好的电致变色效应 ,是人们研究的重点 .其中 MoO3的电致变色效果要好于 IrO2、 TiOx、 CoO及 NiOx等电致变色材料 [1],而且它在可见光区有比 WO3更柔和的色彩 ,使人眼更易于适应其颜色变化 .着色态的 MoO3称为钼青铜 ,其开路记忆也好于钨青铜 [2].故 MoO3电致变色薄膜是极有潜力用于实用化的电致变色器件 .MoO3薄膜常用的制备方法有真空蒸 发、化学气…     

MoO3电致变色薄膜的XPS研究

Molybdenum oxide films were fabricated successfully by spin coating from Li＋ doped peroxo polymolybdate solution via sol gel technique.Their electrochemical and electrochromic properties were investigated by cyclic voltammetry and in situ UV transmittance measurements.The results showed that the films possessed excellent electrochemical stability and reversibility.The electrochromic mechanism of the MoO3 was discussed by using results obtained from X ray photoelectron spectroscopy (XPS).The results showed that the most part of the Mo6＋ in MoO3 film was reduced to Mo5＋ and Mo4＋ ions during the Li＋ intercalation process,Mo4＋ was oxidized to Mo5＋ and part of Mo5＋ was oxidized to Mo6＋ again during the Li＋ deintercalation process.So it was considered that Mo4＋ ions existed in the colored MoO3 films.     

三氧化钼溶胶凝胶光致变色的研究

通过金属钼粉与过氧化氢溶液反应制备三氧化钼溶胶和凝胶,在高压汞灯的照射下,溶胶和凝胶由浅黄色变成蓝色。Raman光谱研究表明：通过紫外光照,MoO3凝胶结构进行了重整,呈有序排布。乙醇相的MoO3溶胶在紫外光照或长期自然光照下,均表现出光致变色特性。电子自旋共振(ESR)和X射线电子能谱(XPS)研究表明：空气中的MoO3经光照同时接受质子和电子后,生成了蓝色的钼青铜,其中Mo^6^+被还原成了Mo^5^+离子。