LaBO_3(B=Ni,Mn,Fe)/石墨烯复合薄膜的制备及光催化性能

Preparation and photocatalytic performance of LaBO_3(B=Ni,Mn,Fe)/graphene composite thin film

为提高纳米钙钛矿型氧化物薄膜的光催化性能,应用改进的Hummer法制备出薄层石墨烯材料,并采用溶胶-凝胶法结合旋转涂膜技术在玻璃上制备出石墨烯基LaBO3(B=Ni,Mn,Fe)复合薄膜。利用XRD、FTIR、FESEM和TEM对薄膜样品的结构、晶粒尺寸及微观形貌进行表征,利用显微拉曼光谱仪测量制备出的石墨烯和薄膜样品在激光功率为400 mW时位于100?3 000 cm-1之内的拉曼光谱。将该复合薄膜作为光催化剂,研究石墨烯用量、不同B位元素对该复合薄膜光催化活性的影响。结果表明:复合薄膜的光催化活性显著优于纯钙钛矿薄膜的光催化活性;当石墨烯悬浮液的浓度为0.1 g/L,Ni作为B位阳离子时,该复合薄膜的光催化活性最好。

In order to improve the photocatalytic properties of nano perovskite type oxide film, LaBO3 （B=Ni, Mn, Fe）/graphene thin films were prepared by using sol-gel and spin coating method on glass substrate. The thin layer graphene materials were produced by the sol-gel method. The structure, grain size and morphology were characterized by X-ray diffraction （XRD）, Fourier transform infrared （FTIR） spectra, field emission scanning electron microscopy （FESEM） and transmission electron microscopy （TEM）. The Raman spectra of the samples were carried out by micro-Raman spectrometer in the range of 100-3 000 cm-1 with the laser power of 400 mW. The photo-catalytic activity of thin films was studied when there were different graphene contents and B-sit elements. The results show that, compared with pure perovskite films, LaBO3 （B=Ni, Mn, Fe）/graphene thin films show better photo-catalysis. When the concentration of graphene suspension is 0.1 g/L using Ni as the B-sit cation, it has the greatest photocatalytic activity.