双微乳液法制备CoFe_2O_4纳米颗粒及其磁性能研究

Study on Synthesis of CoFe2O4 Nanoparticles by Double Microemulsion and Their Magnetic Properties

以TritonX-100/正己醇/正己烷/水为反应介质,采用双微乳液法合成了尖晶石型CoFe2O4磁性纳米颗粒。利用TG-DSC、FTIR、TEM、XRD、VSM等测试技术对CoFe2O4煅烧前后的结构和磁性能进行表征。结果表明,采用微乳液法制备的CoFe2O4前驱物经煅烧后可获得纳米级磁性微粒。煅烧温度对微粒粒径和磁性能有较大影响,经300℃煅烧后的微粒粒径为15nm,700℃煅烧后微粒粒径增大为52nm。样品的饱和磁化强度和剩余磁化强度也随热处理温度的升高而增加。

CoFe2O4 nanoparticles of single spinel phase crystalline are prepared in a microemulsion consisting of TritonX-100, n-pentanol, n-hexane and water. By means of TG-DSC, FTIR, TEM, XRD and VSM, the structure and magnetic properties of the obtained samples before and after thermal decomposition process are analyzed. The results show that CoFe2O4 nanoparticles are obtained by the double microemulsion method. The temperature of calcination has obvious influence on the particle size and magnetic properties of nanoparticles. When the precursor prepared in the microemulsion is calcined at 300℃, CoFe2O4 nanoparticles with the average size of 15 nm can be obtained and the average size increases to 52nm as the calcination temperature rises to 700℃. The saturation magnetizability and remanent magnetizability of the nanoparticles prepared also increase as the calcination temperature goes up.