摘要
采用电化学阻抗谱法,以吡咯和对甲苯磺酸(p-toluenesulfonic acid,p-TSA)为原料配制反应溶液,以掺氟SnO2 透明导电玻璃为基底,简单而有效地一步合成聚吡咯(polypyrrole,PPy)薄膜.研究了电化学合成中交流电频率范围的变化对所制备的聚吡咯薄膜的结构和电致变色性能的影响.结果表明,在初始电位 0.7 V,施加±100 mV正弦波的基础上,交流电频率范围的变化改变了PPy薄膜颗粒的分布形态,频率范围变化越宽,薄膜颗粒越小,尺度接近于纳米级.当交流电频率范围在10-1∼103 Hz时,制备的PPy薄膜的电致变色性能最佳,其800 nm光波处的光调制幅度达到 65.4%,该薄膜还具有较快的电致变色响应,着色和褪色开关时间分别为 5s和 6.5 s,且其着色效率达到137.4 cm2·C-1,100 次电致变色循环后的光调制幅度保留率可达 65.7%.
Abstract
A simple and effective one-step synthesis based on the electrochemical impedance spectroscopy was carried out to obtain polypyrrole(PPy)thin films on the fluorine-doped SnO2 transparent conducting glass substrates.The pyrrole and p-toluenesulfonic acid(p-TSA)were chosen as raw materials to formulate reaction solutions.The effect of the variation of the alternating current frequency range in the electrochemical synthesis on the structure and electrochromic properties of the prepared polypyrrole films was investigated.The research results showed that the variation of the alternating current frequency range changed the distribution morphology of the PPy film particles based on the initial level of 0.7 V and the application of±100 mV sine wave,and the wider the frequency range variation,the smaller the film particles.The particle size was close to the nanoscale.The best electrochromic performance of the prepared PPy films was achieved when the alternating current frequency range was 10-1-103 Hz,and the light modulation amplitude reached 65.4%at 800 nm.The film also had a rapid electrochromic response with the coloring and bleaching switching times of 5 s and 6.5 s respectively,and the coloring efficiency reached 137.4 cm2·C-1.The retention rate of light modulation amplitude after 100 electrochromic cycles was 65.7%.
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