网络状WO3/聚噻吩纳米线杂化结构薄膜的电致变色性能

以钨酸钠为钨源,盐酸为调节剂,硫酸铵为辅助剂,采用正交试验优化水热工艺参数制备WO3纳米线,再用电化学沉积法制备网络状WO3/聚3,4-乙基二氧噻吩(PEDOT)纳米线杂化结构薄膜,研究了薄膜的结构和电致变色性能。结果表明:在反应温度190℃、反应时间4 h、pH=2的水热条件下制备得到的WO₃的电致变色性能最优,对比度为80.6%;最优水热条件下电化学沉积成功制备得到具有芯壳纳米线杂化结构的WO₃/PEDOT薄膜,单晶WO₃核体外覆盖了一层非晶PEDOT薄壳层;与WO₃纳米线和PEDOT相比,WO₃/PEDOT薄膜具有优异的电致变色性能与光学调制性能、快速的响应速率以及良好的循环稳定性,薄膜的对比度为89.1%,着色时间为3.4 s,褪色时间为22 s,且循环1000周次后,对比度保留98.8%。

Electrochromic Properties of Reticular Tungsten Trioxide/Polythiophene Nanowire Hybrid Structure Film

The hydrothermal parameters were optimized by orthogonal tests to prepare WO₃ nanowires with sodium tungstate as tungsten source,hydrochloric acid as regulator,ammonium sulfate as auxiliary agent,and then the reticular WO₃/poly 3,4-ethylenedioxythiophene(PEDOT)nanowire hybrid structure film was prepared by electrodeposition method.The structure and electrochromic properties of the film were studied.The results show that the electrochromic performance of WO₃ was optimal under hydrothermal reaction temperature of 190℃,time of 4 h and pH of 2,and the contrast was 80.6%.The WO₃/PEDOT film with hybrid structure of score-shell nanowire was successfully prepared by electrochemical deposition under optimal hydrothermal conditions,and the outer side of the WO₃ monocrystalline nucleus was covered by an amorphous thin shell.Compared with W03 nanowire and PEDOT,WO₃/PEDOT film showed excellent electrochromic and optical modulation properties,fast response speed and good cycling stability.The contrast of the film was 89.1%wth the coloring time of 3.4 s and the fading time of 2.2 s,and after 1000 cycles,the contrast was retained 98%.