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

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(PABA)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型振动磁强计对样品进行表征和分析。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150 nm。碳纳米管包覆空心羟基铁粉的饱和磁化强度(M_s)为140.88(A·m2)·kg^(-1),剩磁(M-r)为1.4808(A·m^2)·kg^(-1),矫顽力(H_c)为4.742×10^(-3)T。

The hydroxy-iron powder with a hollow structure（h-hydroxy-iron,h-HI） was prepared using a pitting method,and 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 and Lakeshore7307 VSM were used to characterize the as-prepared products;hydroxy-iron powder,hollow HI and MWCNTs@HI were also characterized as comparisons.The results show that the hydroxy-iron powder can be prepared and grafted with MWCNTs.The best pitting time is 15 min,when the yield of h-HI is the largest,the wall thickness of h-HI particles with 2 μm in diameter is 200 nm,and the thickness of the grafting layer 150 nm.The saturation magnetization（M_s） of MWCNTs@h-HI is 140.88（A·m^2）·kg^（-1）,the remanence（M_r） 1.4808（A·m^2）·kg^（-1） and the coercivity（H_c） 4.742×10^（-3） T.