电磁屏蔽涂料用石墨烯负载氧化钴磁性复合材料的制备及性能研究

Preparation of Cobalt Oxide/Graphene Magnetic Compound Material for Electromagnetic Shielding Coatings and Research on Its Performance

采用Hummers法制备了氧化石墨烯,然后将其在氯化钴溶液中分散均匀,采用水合肼还原氧化石墨烯和钴离子,并经过热处理制备出石墨烯负载钴磁性复合材料。采用FTIR、XRD、SEM和VSM观察分析了制备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。还原后钴以四氧化三钴形式存在,呈薄片状,片径介于100~300 nm范围,不同钴添加量的Co/RGO复合粉体在±1.8×10~4 Oe磁场范围内,均未出现磁感应饱和,表明其具有较大的矫顽力。

Graphene oxide was prepared through the Hummers method, and then it was evenly dispersed in cobalt chloride solution. Hydrazine hydrate was used to reduce graphene oxide and cobalt ions, and cobalt/graphene magnetic compound material was prepared through heat treatment. An analysis of FTIR, XRD, SEM and VSM observation of the sample＇s structural evolution and static magnetism showed the surface of graphene oxide contained a lot of oxidant radicals with crystal spacing larger than scale graphite and showing non-crystal features. After reduction, cobalt existed in the form of cobaltosic oxide flakes with sizes between 100 nm and 300 nm. Different dosages of Co/RGO mixture powder within the magnetic field range of ±1.8×10~4 Oe did not demonstrate magnetic induction saturation, showing it had strong coercive force.