La、Nd、Bi共掺杂制备TiO2电致变色薄膜及其性能研究

Preparation and Property of La, Nd, Bi Co-doped TiO2 Electrochromic Film

摘要:

为了提高TiO2薄膜的光学属性和着色效率,采用溶胶–凝胶工艺,以钛酸丁酯为前驱体在ITO导电玻璃基片表面制备了La、Nd、Bi共掺杂TiO2薄膜。采用TG-DTA、XRD、UV-Vis、电化学工作站等手段研究分析了TiO2粉末和薄膜的结构和表面形貌的光学和电致变色性能。结果表明:在400℃、500℃和600℃热处理的二氧化钛干凝胶中形成锐钛矿型二氧化钛,且热处理温度越高,晶体发育越完整。La、Nd、Bi掺杂TiO2增加了TiO2八面体的排列无序性,导致非晶化程度提高，体积分数为12%的钛酸丁酯对应制备的薄膜具有优良的电致变色性能。500℃热处理的TiO2薄膜电致变色性能最为优异。实验进行了La、Nd、Bi单独掺杂TiO2薄膜的性能分析, 按照摩尔掺杂量8%La、18%Nd、6%Bi的TiO2薄膜具有较优异的变色性能, 单独掺杂变色效果: 6% Bi﹤8% La﹤18% Nd。La、Nd、Bi共掺杂TiO2锐钛矿仍然具有很高的非晶化程度, 且当摩尔掺杂量比La:Nd:Bi=4:10:2时, 取得薄膜最佳循环伏安特性, 掺杂TiO2非晶相程度最高。

Abstract:

To improve optical property and coloration effect, La, Nd and Bi co-doped TiO₂ films were synthesized via a Sol-Gel method, by using butyl titanate as precursor on the surface of ITO glass substrate. Structural surface morphologies and electrochromic properties of the as-prepared films were examined with TG-DTA、XRD、UV-vis and Electrochemical workstation. The results showed that anatase TiO₂ formed from TiO₂ dry gels after heat treatment at 400℃, 500℃, 600℃, and showing tendency of the higher the temperature heat treatment, the more complete the crystal development. La, Nd and Bi doped TiO₂ increased the disorder of the TiO₂ octahedron, resulting in increase of the amorphized degree. TiO₂ films prepared with acurate 12% tetrabutyl titanate exhibited the best electrochemic properties. TiO₂ films heat-treated at 500℃ showed excellent electrochemical properties. TiO₂ films separately doped with molar amount fraction of 8%La, 18%Nd, 6%Bi, possess excellent electrochemic properties,and single doping effect is in the order of 6% Bi < 8 %La<18% Nd. La-Nd-Bi co-doped TiO₂ is anatase with a very high amorphized degree, with the best cyclic valtammentry and highest amorphized degree when the molar amount ratio of La:Nd:Bi=4^:10^:2.