介孔TiO2-ZnO复合薄膜的制备与表征

以三嵌段聚合物P123为模板剂, 以钛酸异丙酯和二水乙酸锌为无机前驱体, 利用溶胶-凝胶法和旋涂法成功地制备了不同ZnO含量的介孔TiO2-ZnO复合薄膜. 在ZnO前驱体摩尔分数为0~50％范围内获得薄膜质量较高的介孔TiO2-ZnO复合薄膜. 用小角XRD、扫描电子显微镜(SEM)、高分辨透射电子显微镜(HRTEM)、能谱仪(EDS)、紫外-可见吸收光谱(UV-Vis)及X射线光电子能谱(XPS)对所得的复合薄膜进行了表征和分析. EDS和XPS等研究证明介孔薄膜为TiO2和ZnO的复合体系, 且ZnO前驱体含量的增加仍能保持TiO2-ZnO复合薄膜的均匀性. UV-Vis研究结果表明, 介孔复合薄膜的光学带隙宽度为3.45-3.58 eV, 随着ZnO含量的增加, 复合薄膜的紫外吸收蓝移.

Preparation and Characterization of Mesoporous TiO2-ZnO Thin Films

We reported the preparation of well-organized mesoporous TiO2-ZnO thin films with titanium isoproxide and zinc acetate dihydrate as the inorganic precursors and triblock copolymer(Pluronic P123) as the template via a sol-gel and spin-coating process.The molar fraction of ZnO could be tuned in the mesoporous TiO2-ZnO thin film by varying the molar fraction of Zn precursor in the range from 0 to 50%.The resulting films were characterized and analyzed via small-angle X-ray diffraction(SAXRD),scanning electron microscopy(SEM),high resolution transmission electron microscopy(HRTEM),energy-dispersive spectrometry(EDS),UV-Vis absorption spectrum and X-ray photoelectron spectroscopy(XPS).Both EDS and XPS demonstrate that the as-synthesized mesoporous thin films were made of TiO2 and ZnO.With ZnO molar fraction increased,the optical band gap of the thin films varied from 3.45 eV to 3.58 eV.