CoFe_2O_4/TiO_2纳米复合薄膜的制备与磁性

Preparation and Magnetic Properties of CoFe_2O_4/TiO_2 Nano-Composite Films

以钛酸丁酯和金属盐酸盐为原料,采用溶胶-凝胶工艺制备了磁性CoFe2O4/TiO2复合薄膜。通过综合热分析(DSC)、X射线衍射仪(XRD)、扫描电镜(SEM)、原子力显微镜(AFM)、偏光显微镜(PLM)观测了复合薄膜的相结构和表面形貌,探讨了薄膜的合成机理,采用振动样品磁场计测量样品的磁性。研究发现,溶胶-凝胶法制得的复合薄膜中,随着热处理温度的升高,两相组分晶体各自析出长大,CoFe2O4均匀地分布在TiO2网状基体中。样品经800℃退火后得到了平整的CoFe2O4/TiO2磁性复合薄膜,晶粒平均粒径大约为19nm。随着热处理温度的升高,复合薄膜的磁性增强。

Using Ti（n-OC4H9）4 and metal hydrochloric acid salt as raw materials, we prepared CoFe2O4/TiO2 composite films by sol-gel method. The films were characterized by TG-DSC, XRD, SEM, AFM and PLM. The phase constitution, surface morphology and synthesizing mechanism of the composite films were analyzed and discussed. The magnetic properties of the samples were measured by VSM. The results showed that with increasing annealing temperature the crystals of different phases grow up independently, with CoFe2O4 uniformly embeding into TiO2 matrix in the prepared composites films. Flat nano-composite films could be obtained at annealing temperature of 800℃, with average particle size of 19nm. Magnetic property of the composite films increases with increasing annealing temperature.