氧化钼/聚吡咯复合膜的制备及变色性能研究

Preparation and Electrochromic Properties of Molybdenum Oxide/Polypyrrole Composite Film

为了弥补无机变色材料的不足,引入有机聚合物进行复合,组装成互补型电致变色器件.本文以七钼酸铵为原料,采用水热法合成六方相氧化钼(h-MoO_3),通过浆料法制备氧化钼变色薄膜并组装成变色器件.利用恒电压聚合法制得聚吡咯薄膜,并与氧化钼薄膜复合组装纳米氧化钼/聚吡咯复合变色器件.采用X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)、扫描电子显微镜(SEM)、紫外-可见分光光度计和电化学工作站对样品的结构以及器件的变色性能进行表征.结果表明:氧化钼的晶型为h-MoO_3;随反应时间的延长,不规则颗粒状的MoO_3逐渐生长并形成六角棒状,其直径为3μm,长度为20μm;氧化钼/聚吡咯复合变色器件的着色与褪色时间分别为35s和22s;在481nm处吸收峰的强度从0.62减小到0.55,光学对比度变化大.

To make up for the deficiencies of inorganic electrochromic material,organic polymer was introduced into the composite,and a complementary electrochromic device was assembled.In this research,hexagonal molybdenum oxide(h-MoO 3)was prepared by the hydrothermal method with ammonium hepta molybdate as the raw material.MoO 3 electrochromic film was prepared by the slurry method and then assembled into the electrochromic device.Pyrrole was polymerized by the constant voltage method to prepare the polypyrrole(PPy)film,which was combined with molybdenum oxide to fabricate the molybdenum oxide/polypyrrole composite electrochromic device.The structure of the samples and the electrochromic performance of the devices were characterized by an X ray diffractometer(XRD),a Fourier transform infrared spectrometer(FT-IR),a scanning electron microscope(SEM),a UV-vis spectrophotometer and electrochemical workstation.The results show that the crystal form of molybdenum oxide was h-MoO 3.With the extension of the reaction time,the irregular granular MoO 3 grew gradually and its morphology became hexagonal rod like shaped,with a dimater of 3μm and a length of 20μm.The coloring and bleaching response times of molybdenum oxide/polypyrrole composite electrochromic device were 35 s and 22 s,respectively.The intensity of the absorption peak at 481 nm decreased from 0.62 to 0.55,indicating that the device had high optical contrast.