碳纳米管包覆空心羟基铁粉的制备及其磁性能

Preparation and magnetic properties of MWCNTs grafted Hollow-HI

摘要:

采用点蚀法处理羟基铁粉(hydroxy-iron, HI)制备出具有空心结构的羟基铁粉(h-HI)，以对氨基苯甲酸(PBAB)作为活性嫁接剂，连接空心羟基铁粉与碳纳米管，制备出碳纳米管包覆的空心羟基铁粉(MWCNTs@h-HI)。使用XRD、SEM、TEM及Lakeshore 7307型振动样品磁强计对样品进行表征和分析。实验结果表明，通过点蚀处理可制得空心羟基铁粉，当点蚀时间为15 min时，空心羟基铁粉产率最大，粒径约为2μm的空心羟基铁粉的壁厚范围为200 nm，包覆层厚度约为150nm。碳纳米管包覆空心羟基铁粉的饱和磁化强度(Ms)为140.88 emu/g，剩磁(Mr)为1.48emu/g，矫顽力(Hc)为47.42 G。

Abstract:

The hydroxy-iron powder with a hollow structure（h-hydroxy-iron，h-HI）were prepared with pitting method, then hollow-HI coated with MWCNTs(MWCNTs@h-HI) were prepared by connecting h-HI and MWCNTs with PABA as the active grafting agent. XRD、SEM、TEM Lakeshore7307VSM were used to characterize the as-prepared products, Hydroxy-iron powder, hollow HI and MWCNTs@HI were also characterized as comparisons. The experimental results showed that the hydroxy-iron powder was successfully prepared and grafted with MWCNTs, the best pitting time was 15min, the wall thicknesses of h-HI particles were 200nm and the thickness of grafting layer were 150nm when the diameters of h-HI particles were about 2μm. The saturation magnetization (Ms) of MWCNTs@h-HI was 140.88emu/g, the remanence(Mr) was 1.48emu/g and the coercivity(Hc) was 47.42G.