La、Nd、Bi共掺杂制备TiO_(2)电致变色薄膜及其性能研究

Preparation and Property of La, Nd, Bi Co-doped TiO_(2) Electrochromic Film

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XRD、UV-vis和化学工作站等手段研究了TiO2薄膜的结构和表面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%的钛酸丁酯相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,单独掺杂摩尔分数为8%La、18%Nd、6%Bi的TiO2薄膜具有较优异的变色性能,单独掺杂变色效果的顺序是6%Bi<8%La<18%Nd。La、Nd、Bi共掺杂锐钛矿型TiO2仍然具有很高的非晶化程度,且当掺杂摩尔比La:Nd:Bi=4:10:2时,取得薄膜最佳循环伏安特性,掺杂TiO2非晶化程度最高。

To improve optical property and coloration effect, La, Nd and Bi co-doped TiO 2 films were synthesized via a sol-gel method, using butyl titanate as precursor on the surface of ITO glass substrate. Structures and surface optical electrochromic properties of the as-prepared films were examined with XRD, UV-vis and electrochemical workstation. The results show that anatase TiO2 forms from TiO2 dry gels after heat treatment at 400, 500, and 600 °C, and the higher the heat treatment temperature, the more complete the crystal development. La, Nd and Bi doping increases the disorder of the TiO2 octahedron, resulting in an increase of the amorphization degree. TiO2 films prepared with volume fraction 12% tetrabutyl titanate exhibit excellent electrochromic properties. TiO2 films heat-treated at 500 °C show the best electrochromic properties. TiO2 films singly doped with 8% La, 18% Nd, and 6% Bi(molar fraction) possess excellent electrochromic properties, and single doping effect is in the order of 6% Bi< 8% La<18% Nd. La-Nd-Bi co-doped TiO2 is anatase type with a very high amorphization degree, and the best cyclic voltammetry and the highest amorphization degree can be achieved when the molar ratio of La:Nd:Bi is 4:10:2.