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采用溶胶-凝胶法结合旋转涂膜工艺在玻璃基底上制备出了多层纳米晶薄膜LaMO3(M=Fe,Mn,Co,Cr);采用DSC/TG技术分析了前驱体凝胶的热分解历程;利用场发射扫描电镜观察了薄膜的表面形貌及膜层厚度。通过XRD进行了物相分析,并计算了其晶粒尺寸;实验结果表明,制备出的LaMO3多层薄膜具有钙钛矿晶型结构,薄膜形态比较均匀。将该类薄膜作为光催化剂,对多种水溶性染料进行了光催化降解实验。研究结果表明,纳米晶薄膜LaMO3的光催化活性主要和M原子的电负性及M离子的d电子结构有关。当M为Co时,薄膜的光催化效果最好。
LaMO3 (M = Fe, Mn, Co, Cr) nanocrystalline thin films were prepared on glass substrates by sol-gel method combined with spin-coating process. The thermal decomposition of precursor gel was analyzed by DSC / TG The surface morphology and film thickness of the films were observed by field emission scanning electron microscopy. The phase analysis was carried out by XRD and the grain size was calculated. The experimental results show that the prepared LaMO3 multilayer films have the perovskite crystal structure and the film morphology is relatively uniform. This type of film as a photocatalyst, a variety of water-soluble dyes photocatalytic degradation experiments. The results show that the photocatalytic activity of LaMO3 nanocrystalline thin film is mainly related to the electronegativity of M atom and the d-electron structure of M ion. When M is Co, the photocatalytic activity of the film is the best.