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以钛酸丁酯和金属盐酸盐为原料,采用溶胶-凝胶工艺制备CoFe2O4/TiO2复合薄膜.探讨热处理温度和前驱液pH值对CoFe2O4/TiO2复合薄膜结构及磁性的影响.通过X射线衍射(XRD)分析了复合薄膜的相结构;采用扫描电子显微镜(SEM)、原子力显微镜(AFM)和偏光显微镜(PLM)观测了薄膜表面形貌;用振动样品磁强计(VSM)测试了样品的磁性.结果表明,薄膜生长过程中两相组分的晶体各自析出长大,CoFe2O4均匀地嵌埋于TiO2基体中;薄膜中晶粒的生长对反应体系的pH值、热处理温度依赖性较大,前驱液pH在2~3范围内,经800℃热处理后得到纳米复合薄膜,晶粒平均粒径为19nm;随着热处理温度的升高,复合薄膜的磁性增强.
The effects of heat treatment temperature and pH value of precursor solution on the structure and magnetic properties of CoFe2O4 / TiO2 composite films were investigated by using sol-gel process using butyl titanate and metal hydrochloride as raw materials. XRD, (XRD). The surface morphology of the films was observed by scanning electron microscopy (SEM), atomic force microscopy (AFM) and polarized light microscopy (PLM). The surface morphology of the films was measured by vibrating sample magnetometer (VSM) The results show that the crystals of the two phase components are precipitated and grown in the process of film growth, CoFe2O4 is uniformly embedded in the TiO2 matrix. The growth of the crystal grain depends on the pH and the temperature of the reaction system. The precursor solution pH was in the range of 2 ~ 3. After heat treatment at 800 ℃, the nanocomposite films were obtained, and the average grain size was 19 nm. The magnetic properties of the composite films were enhanced with the increase of the heat treatment temperature.