碳包裹纳米Co粒子的制备及其磁性

Preparation and Magnetism Study of Carbon Coated Nano Co Particles

摘要:

采用离子交换树脂(D113)经过与Co二价离子交换后形成含金属的前驱体(Co/D113)，经热解制备碳包裹纳米Co粒子。TG分析表明，Co/D113的热稳定性要强于D113。XRD、TEM结果表明，在400~700 ℃热解Co/D113可获得碳包裹面心立方结构(fcc)的纳米Co粒子，而且纳米Co粒子的粒径随热解温度的升高而增大。室温磁性能测试结果表明，400~700 ℃热解产物的矫顽力Hc均远大于相应的块体材料，并与产物中纳米Co粒子的尺寸有关；所有热解产物的比饱和磁化强度Ms小于相应的块体材料，并随其中纳米Co粒子尺寸的增大而增加

Abstract:

Carbon coated nano Co particles were prepared by pyrolysis of Co-exchanged resin (Co/D113) at 400 to 700 ℃. The TG results show that the thermal stability of Co/D113 is better than that of pure D113 resin. The XRD and TEM results reveal that the cobalt particles existed mainly in the form of fcc Co phase, and the particle size of nano-Co increase with the increase of pyrolytic temperature. The magnetic tests show that the coercivity(Hc) of the pyrolyzates obtained at 400 to 700 ℃ at room temperature are much higher than that of the corresponding bulk material, and the Hc value is influenced by the size of the nano particles. The saturation magnetizations (Ms) of all the pyrolyzates are lower than that of bulk material and increase with the increase of pyrolytic temperature