表面活性剂对CoFe_2O_4纳米颗粒结构和磁性的影响

Effect of surface active agent on structure and magnetic properties of CoFe_2O_4 nanoparticles

以1,2-十六烷二醇(HDD)作为表面活性剂,采用热分解方法制备CoFe_2O_4纳米颗粒。利用X射线衍射、透射电镜、振动样品磁强计对CoFe_2O_4纳米颗粒的结构、表面形貌和磁性进行分析,研究HDD对CoFe_2O_4纳米颗粒的结构和磁性的影响。结果表明,通过HDD的加入,可提高CoFe_2O_4纳米颗粒的分散性,调控CoFe_2O_4纳米颗粒的形状和尺寸。随着CoFe_2O_4纳米颗粒尺寸的减小,样品的矫顽力和饱和磁化强度降低。

CoFe2O4 nanoparticles were prepared by thermal decomposition method using 1,2-hexadecanediol （HDD） as the sur- factant. In order to study the effects of surfactant on the microstructure and magnetic properties of CoFe2O4 nanoparticles, the samples were analyzed through X-ray diffraction, transmission electron microscopy and vibrating sample magnetometer. The re- suits show that the addition of HDD promotes the dispersion, and controls the grain size and shape of CoFe2O4 nanoparticles. With the decrease of grain size, the coercive force and saturation magnetization decrease correspondingly.