一步法原位合成Fe_2O_3/Ag磁性核壳粒子

Synthesis of Fe_2O_3/Ag Core-shell Composite Nanoparticles by One Step In-situ Method

采用原位法一步合成了α-Fe2O3和Fe2O3/Ag磁性核壳粒子,通过XRD,TEM和UV光谱研究了Fe2O3/Ag核壳纳米复合材料的结构。结果表明:一步合成了α-Fe2O3,纳米α-Fe2O3粒子表面被Ag层包覆,纳米α-Fe2O3核的平均粒径大约为20～30nm,Ag壳层厚度为10～15nm,形成了核壳结构的电磁复合纳米粒子。α-Fe2O3/Ag核壳纳米复合材料导电率为0.317S/cm。α-Fe2O3粒子具有超顺磁性,饱和磁化强度为1.28A.m2.kg-1,矫顽力为8.2784kA.m-1。α-Fe2O3/Ag核壳粒子饱和磁化强度为0.92A.m2.kg-1,其矫顽力与α-Fe2O3粒子基本一致。

α-Fe2 O3 and Fe2O3/Ag core-shell nanocomposites were synthesized by one step irt-situ meth- od. The structure of α-Fe2O3 and Fe2O3/Ag core-shell composite nanoparticles was confirmed by XRD, TEM and UV spectra. The results show that α-Fe2O3 and Fe2O3/Ag core-shell nanocomposite can be synthesized by one step, the average size of the α-Fe2O3 nanocomposites is 20-30nm, with a thickness of 10-15nm of Ag layer, core-shell structure is formed. Conductivity of Fe2O3/Ag core-shell nanocomposites is 0. 317S/cm. Saturation magnetization of α-Fe2O3 is 1. 28A · m^2 · kg^-1 , coercive force is 8. 2784kA · m^-1. Saturation magnetization of F2O3/Ag is 0.92A · m^2 · kg^-1 , coercive force is equal with α-Fe2 O3 particles.