络合剂对ZnO薄膜的结构及其光催化性能的影响

采用溶胶-凝胶技术,以醋酸锌为前驱体,分别以乙醇胺、二乙醇胺、三乙醇胺为络合剂,在玻璃载玻片上制备了ZnO薄膜。利用X射线衍射(XRD)、原子力显微镜(AFM)、紫外-可见(UV-Vis)吸收光谱和X射线光电子能谱(XPS)等技术研究了以不同络合剂制备的ZnO薄膜的结构、表面形貌和光吸收性能以及表面化学态。以浸渍在ZnO薄膜表面的亚甲基兰为目标降解物评价薄膜的光催化活性。结果表明,乙醇胺为络合剂制备的ZnO薄膜具有良好的c轴择优取向,主要是由较小的晶粒扩散距离所致;以二乙醇胺为络合剂制备的ZnO薄膜显示较高的光催化活性,可能是由相对较好的光吸收性能以及较多的氧缺陷所致。

Effect of Complexants on the Microstructure and Photocatalytic Activity of ZnO Thin Films

Zinc acetate as precursor, a series of ZnO films were deposited on glass slide using sol-gel technique by altering the complexants (monoethanolamine, diethanolamine, triethanolamine). The phase composition, surface morphology, optical absorption property, surface chemical state, et al. was characterized by X-ray diffraction (XRD), atomic force microscope (AFM), UV-Vis absorption spectroscopy, X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL). The degradation of methylene blue impregnated on ZnO films were used to evaluate the photocatalytic activity of the three kinds of catalyst. The results showed that ZnO thin films prepared with monothanolmine showed excellent c-axis orientation, the main reason was considered as the shorter grain diffusion length. The higher phtocatalytic activity of ZnO films prepared with diethanolamine caused by relatively better optical absorption property and many oxygen defects.