微波法制备组成可控Cu_(1-x)Ni_x/MWCNTs复合材料及其磁性能

Microwave-assisted Synthesis and Magnetic Properties of Composition-controlled Cu_(1-x)Ni_x/MWCNT Nanocomposites

在不加表面活性剂的条件下,采用微波法制备碳纳米管负载组成可控的Cu1-x Nix/MWCNTs(x=0.5,0.6,0.8)纳米复合材料,其结构和形貌通过XRD,TEM,SEM,EDX,FT-IR等技术进行表征,用VSM测试了材料的磁性能。结果表明:组成可控近似球形的Cu1-x Nix合金纳米粒子均匀地负载在碳纳米管表面;Cu1-x Nix合金为面心立方结构,当Ni含量增加时合金的晶格常数和粒径都逐渐减小;随着铜镍合金中Ni含量的增加,Cu1-x Nix/MWCNTs复合材料的饱和磁化强度(Ms)增大,矫顽力(Hc)减小。另外,探讨了纳米复合材料的形成机理。

Composition-controlled Cul-xNix/MWCNT nanocomposites （x = 0.5, 0.6, 0.8） were pre- pared by microwave-assisted method without using additional protective agents. The structure and morphology of the as-prepared nanocomposites were characterized by XRD, TEM, SEM, EDX and FT-IR spectroscopy. The magnetic properties were measured by VSM. The results show that Cul-x Nix alloy nanoparticles are face-centered cubic structure, quasi-spherical and disperse uniformly on the surface of MWCNTs. Both the lattice parameter and the size of Cul-xNix alloy nanoparticles decreased with increasing Ni content. The saturation magnetization （Ms） of Cu1-xNix/MWCNT nanocomposites increases whereas the coercivity （He） decreases with increasing Ni content. Moreover, a possible mechanism of formation was discussed.