磷钨酸/聚吡咯复合膜的制备及其光致变色性能的研究

Preparation and UV Photochromic Performance of Phosphotungstic Acid/Polypyrrole Composite Films

将磷钨酸(PWA)量子点分散在聚吡咯(PPy)中,利用滴膜法制备出光致变色复合膜。利用透射电子显微镜(TEM)、红外光谱(FT-IR)、紫外-可见吸收光谱(UV-vis)以及X射线光电子能谱(XPS)研究了该复合膜的结构和光致变色性能及机制。结果表明,球形的PWA量子点很好的分散在复合膜中,PWA的Keggin结构在复合过程中未被破坏,PWA和PPy之间存在非化学键相互作用。经可见光照射后,复合膜由无色变为蓝色,部分W^(6+)被还原为W^(5+),表明其光致变色过程中PWA与PPy之间有光还原反应的发生,该变色过程根据质子转移的机理进行。

The UV light responsive photochromic composite films were prepared by highly dispersing phosphotungstic acid(PWA)quantum dots in polypyrrole(PPy).Transmission electron microscopy(TEM),infrared spectroscopy(FT-IR),ultraviolet visible absorption spectroscopy(UV VIS)and X-ray photoelectron spectroscopy(XPS)were used to investigate the structure,photochromic properties and mechanism of the composite films.The results show that the spherical PWA quantum dots are well dispersed in the composite film,the Keggin structure of PWA is not destroyed during the composite process,and there is a non-chemical bond interaction between PWA and PPy.After UV light irradiation,the composite membrane changed from colorless to blue,and W^(6+) was partially reduced to W^(5+),indicating that there was a photoreduction reaction between PWA and PPy in the photochromic process,which was based on the mechanism of proton transfer.