Ag包覆Fe复合纳米粉体的制备及导电导磁性能研究

用化学镀法,以葡萄糖和甲醛的混合液为还原剂,制备了Ag包覆Fe复合纳米粉体,并用制备的复合纳米粉作为导电导磁相,制备了导电导磁胶。用透射电子显微观察和X射线衍射表征了Ag包覆Fe复合纳米粉体的结构、形貌和粒度分布,用直流低电阻测试仪、振动样品磁强计研究了导电导磁胶的导电导磁性能。结果表明:制备的Ag包覆Fe复合纳米颗粒具有壳核结构(纳米Fe为核、Ag为壳),复合纳米颗粒粒度分布为50~120 nm,通过电镜测得Ag层的厚度约为2 nm。用Ag包覆Fe复合纳米粉制备的导电导磁胶的电阻率为2.66×10~(-4)~8.9×10~(-4)?·cm、饱和磁化强度18.5~38.6 A·m~2·kg~(-1)。

Preparation and electrical/magnetic conductivity study of Fe composite nanopowders coated by Ag

Fe composite nanopowders coated by Ag were prepared by the electroless plating method using glucose and formaldehyde as a reducer.Conduction and magnetic pastes were prepared using the composite nanopowders as a conduction and magnetic phase.The structure,morphology,and size distribution of the composite nanoparticles were studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM).The electrical conductivity and magnetic property of the conduction and magnetic pastes were detected by resistivity analysis and vibrating sample magnetometry (VSM).The results show that,the composite nanoparticles have a core-shell structure,and the Ag layer acts as the particle shell of ～2 nm in thickness.The composite nanoparticle size is in a range of 50～120 nm.The resistivity is 2.66×10-4～8.9×10-4 Ω·cm,and the saturation magnetization is 18.5～38.6 A·m2·kg-1.