A precursor solution was prepared by dissolving nickel chloride salt and citric acid in butanol and ethanol. The solution was refluxed under continuous stirring and adding predetermined amount of water (solution in solvent). The thin films were deposited by dip-coating methods. The thin films were analyzed by TG, DSC, TEM, SEM, XRD and cyclic voltammetry. The influence of heat treatment temperature on film transmittance in the range of 350 nm to 850 nm was discussed. Results show that the thin film can transform from amorphous into cubic-NiO nanocrystalline by means of heat treatment. The results of cyclic voltammetry of the films, carried out in an electrochemical cell with three electrodes and 0.1mol/L KOH electrolyte ,show that the NiO thin film treated at 350℃ for 30min has a good electrochromic performance. As given voltage, the films reversibly change their colors from transparent to brown, and their transmittance can modulate from 80% to 30%. The cyclic voltammeter results.....Details,please contact the auther, editor directly.

以无水氯化镍、乙醇为前驱液,加入适量的丁醇和柠檬酸为稳定剂,通过回流、水解得到稳定的溶胶;采用浸渍-提拉的方法在ITO导电玻璃上形成均匀的膜层;分析了溶胶制备中加水量的影响;研究了热处理温度对制备膜层的结构、光透过率的影响;对经过不同处理的膜层进行X射线衍射、透射电子显微镜、扫描电子显微镜、热重分析等研究表明:在空气中加热到350℃、保温30min薄膜分解为稳定的具有立方结构的NiO纳米晶;以氢氧化钾水溶液为电解质的循环伏安、电致变色实验结果表明制备的纳米氧化镍薄膜具有良好的电致变色特性.

【Key words】 nickel oxide thin film; electrochromic properties; sol-gel; nanocrystalline

【关键词】 溶胶-凝胶; 电致变色; 纳米晶; 氧化镍薄膜

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