硒/氧化石墨烯/二氧化钛复合薄膜的制备及光电转换性质

摘要

将氧化石墨烯(GO)掺入钛酸溶胶中,以导电玻璃(ITO)为基底,经浸渍-涂覆-煅烧得到GO/TiO2复合薄膜；采用电沉积技术在GO/TiO2薄膜表面沉积Se纳米微粒,得到Se/GO/TiO2复合薄膜；利用扫描电子显微镜和X射线衍射仪分析了复合薄膜的形貌和晶体结构,采用紫外可见光谱仪测定了其光谱学性质,利用光电转换实验测定了其光电转换性质.结果表明,所制备的Se/GO/TiO2复合薄膜各组分分布均匀,具有锐钛矿相结构的TiO2颗粒粒径为20 nm,与TiO2结合的GO具有分散片层结构,薄膜中的Se颗粒粒径为60～80 nm.与此同时,在Se和GO的共同作用下,Se/GO/TiO2复合薄膜对可见光有很好的光电转换效应.%Graphene oxide (GO) was introduced into Ti(OH)4 sol to generate a mixed dispersion. Resultant mixed dispersion was coated onto the surface of indium tin oxide (a conductive glass) to afford GO/TiO2 composite film by way of immersion, coating, and calcination. Then Se nanoparticles were deposited on the surface of GO/TiO2 composite film by electrodeposition yielding Se/GO/TiO2 composite film. The morphology and crystal structure of as-prepared Se/ GO/TiO2 composite film were analyzed by means of scanning electron microscopy and X-ray diffraction, and an ultraviolet-visible light spectrometer was performed to examine its spectro-metric properties. Moreover, the photoelectric transformation performance of as-prepared Se/ GO/TiO2 composite film was also evaluated. Results show that as-prepared Se/GO/TiO2 composite film consists of evenly distributed ingredients. Namely, anatase phase TiO2 particulates in Se/GO/TiO2 composite film have a size of 20 nm, GO attached to TiO2 nanoparticles has sheet-like dispersive structure, and deposited Se particulates have a size of 60 -80 nm. Besides, as-prepared Se/GO/TiO2 composite film has satisfactory photoelectric conversion performance, due to the co-function of Se and GO.