石墨烯负载纳米镍磁性材料的制备及性能测试

Synthesis and Properties of Reduced Graphene Oxide Supported Ni Nanoparticles Magnetic Composites

用Hummers法制备了氧化石墨烯,将其在氯化镍溶液中分散均匀,采用水合肼还原氧化石墨烯和镍离子,制备出石墨烯负载纳米镍磁性复合材料。采用FTIR、XRD、SEM、Raman和VSM观察分析了氧化、还原过程中样品的结构演变及静态磁性能,结果表明,氧化石墨烯表面含有大量氧化基团,其晶间距较鳞片石墨大,并呈现出非晶特征。还原后纳米镍颗粒分布在石墨烯表面和层间,当镍添加量从10%(w)增加至50%时,复合材料的饱和磁化强度从0升高至50 emu/g,矫顽力从25 Oe升高至205 Oe。

Reduced graphene oxide supported Ni nano-particles magnetic composites were prepared by reduction of graphene ox- ide and nickel ions in water with hydrazine hydrate and the graphene oxide was synthesized by the Hummers method. The chan- ges of the contents and microstructures of the graphite and the magnetic properties of the composites were observed by FTIR, XRD, SEM, Raman and VSM. The results showed that the graphene oxide contained a large amount of oxidizing groups, and their intergranular distances were larger than that of graphite and exhibited amorphous characteristics. The nickel nanoparticles were distributed on the surfaces and interlayers of graphene and were accompanied by segregation. The saturated magnetization of the composites increased from 0 to 50 emu/g and the coercivity increased from 25 Oe to 205 Oe when the addition of nickel changed from 10% to 50%.