采用溶胶-凝胶法和浸渍提拉技术在载玻片基底上制备出钙钛矿型La_(1-x)Sr_xMnO_3纳米薄膜;采用TG/DTA技术分析前驱体凝胶的热分解历程;利用AFM观察薄膜的形貌特征;通过XRD进行物相分析,并计算其晶粒尺寸.结果表明,La_(1-x)Sr_xMnO_3薄膜在600 ℃形成,为钙钛矿结构,其平均晶粒尺寸为10.349 nm.采用该薄膜对多种水溶性染料进行光催化降解试验的结果表明,掺杂后该类纳米薄膜有较好的光催化效果,当x＝0.2时光催化效果最好.
The perovskite La_(1-x)Sr_xMnO_3 nano thin-film on the slide glass basis were prepared by sol-gel method and dip-coating technology. The heat decomposition of the precursor gel was analyzed by means of TG/DTA. The appearance characteristic of the thin film was observed by AFM. The phase change was analyzed by XRD and crystal grain size was also calculated. The results show that the perovskite La_(1-x)Sr_xMnO_3 thin film can be synthesized at 600 °C and average crystal grain size is 10.349 nm. The degradation experiment of various water-soluble dyestuffs was performed using the film as photo-catalyst. The results reveal that this nano thin-film with Sr doping has good photo-catalysis and when x=0.2 the effect is best.
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