Fe_3O_4/石墨烯复合材料的制备及表征

Synthesis and characterization of Fe_3O_4/graphene composites

采用液相还原的方法,在碱性环境下使用FeCl2.4H2O和氧化石墨作为前驱体,制备Fe3O4微球附载的石墨烯复合材料。通过调节氧化石墨和铁盐的质量比制备得到不同组分的Fe3O4/石墨烯复合粉体。使用场发射电子扫描显微镜(FESEM)、X射线衍射仪(XRD)、振动样品磁强计(VSM)和四探针电阻仪等仪器分析了产物的形貌、物相、磁性能和导电性能。结果表明Fe3O4/石墨烯复合粉体中Fe3O4微球在石墨烯表面分散均匀,且Fe3O4结晶良好,为立方晶系的尖晶石型。该复合粉体具有高的磁性能和良好的导电性能,饱和磁化强度和电导率分别达到72emu/g和0.53S/cm。

High conductive Fe3O4/graphene composites were synthesized through solution chemical reduction method.The structure,morphology,magnetic and electrical properties of the composites were characterized by fielde emission scanning electron microscope（FESEM）,X-ray diffraction（XRD）,vibrating sample magnetometry（VSM）and 4-point probe method.The results showed that the Fe3O4 nanoparticle content in the Fe3O4/graphene composites can be easily controlled by altering the mass ratio of FeCl2·4H2O to graphite oxide in the reaction mixture.The Fe3O4 nanoparticles were densely and randomly deposited on the graphene sheets.The saturated magnetization of the composites was increased as the Fe3O4 content of the composites increased and could reach as high as 72 emu/g.Furthermore,the electrical conductivity of the composites reached 0.52 S/cm,showing good electrical properties.