单分散磁性Fe3O4纳米颗粒溶剂热合成及性能

Solvothermal synthesis and properties of monodisperse magnetite nanoparticles

采用溶剂热还原方法,以FeCl3.6H2O和乙二醇为原料,在160℃相对低温条件下成功合成四氧化三铁纳米颗粒。利用X射线衍射仪、场发射扫描电子显微镜和振动样品磁强计等手段对产物进行分析和表征。结果表明:产物Fe3O4为反尖晶石结构,其16 h、24 h合成产物平均粒径分别为145 nm和495 nm。颗粒间没有明显团聚,大小均匀,分散性好,表现出良好的单分散性。研究了反应时间对Fe3O4粒径的影响,24 h产物的饱和磁化强度为79.3 emu/g,显示出较高的磁性能。

Magnetite nanoparticles （Fe3O4） were synthesized by the solvothermal method at 160℃, using FeC13·6H2O and ethylene glycol as reactants. X-ray diffraction, field emission scanning electron microscopy and vibrating sample magnetometer were used to characterize the magnetite nanoparticles. The results indicated that the magnetite nanoparticles were of inverse spinel structure. The average particle sizes of 16 h and 24 h reaction were 145 nm and 495 nm respectively. The particles did not make any agglomeration. They showed outstanding monodisperse property. The influence of reaction time on the particle size of the products was studied. The saturation magnetization of reaction 24 h was 79.3 emu/g. The above particles showed excellent magnetic property.