微波多元醇法制备单分散Ni1-xZnxFe2O4/MWCNTs与磁性能

以多壁碳纳米管(MWCNTs)为模板,三乙二醇(TREG)为溶剂,采用微波多元醇法制备MWC-NTs负载组成可控的Ni1-xZnxFe2O4(x=0.4、0.5、0.6)纳米复合材料Ni1-xZnxFe2O4/MWCNTs。其结构和形貌通过XRD、SEM、TEM和EDX进行表征,用VSM测试样品的磁性,并探讨了微波功率、微波时间对镍锌铁氧体负载的影响。结果表明立方系尖晶石结构的单分散Ni1-xZnxFe2O4磁性纳米粒子均匀负载在碳纳米管表面,平均粒径约为6nm;其磁性能与镍锌铁氧体的组成有关,随着Zn含量的增加,饱和磁化强度(Ms)先增大后减小,当x=0.5时Ms达到最大值。矫顽力(Hc)都比较小,在室温下表现为超顺磁性。

Microwave-assisted polyol synthesis and magnetic properties of monodisperse Ni1-xZnx Fe2O4/MWCNTs nanocomposites

Ni 1-x Zn x Fe 2 O 4 / MWCNTs nanocomposites(x=0.4,0.5,0.6) with controllable composition have been successfully fabricated via microwave-assisted polyol route using triethylene glycol solution(TREG) as solvent.The structure and morphology of the final products were characterized by XRD,SEM,TEM and EDX.The magnetic properties were measured by VSM.The influence of microwave power and microwave time on loading has also been investigated.The results show that the spinel Ni1-xZnxFe2O4nanoparticles with a facecentered cubic structure appear to be a monodisperse distribution on MWCNTs.The average sizes of the nanoparticles were about 6nm.The magnetic properties of Ni 1-x Zn x Fe 2 O 4 / MWCNTs nanocomposites vary with ferrite composition.The saturation magnetization(M s) of Ni 1-x Zn x Fe 2 O 4 / MWCNTs nanocomposites increases firstly and then decrease with Zn content increasing.M s reaches a maximum value when xequals to 0.5.The nanocomposites exhibit low coercivity(H c) at room temperature,which can be a typical characteristic of superparamagnetic.