Neupane Suman, Hong Haiping, Giri Lily, Karna Shashi P, Seifu Dereje
J Nanosci Nanotechnol. 2015 Sep;15(9):6690-4. doi: 10.1166/jnn.2015.10349.
Graphene, with its unique 2D nanostructure and excellent electrical, thermal, and mechanical properties, is considered an alternative to carbon nanotubes in nanocomposites. In this study, we present a one step approach for the deposition of iron oxide (Fe2O3) nanoparticles onto graphene sheets through solution mixture. The morphology, crystallinity, and magnetic properties of as-synthesized composites were investigated. It was shown that highly crystalline Fe2O3 nanoparticles were densely and uniformly coated on graphene surface. Magnetic measurements reveal that, as compared to weak diamagnetism of pristine graphene, graphene-Fe2O3 nanocomposites display ferromagnetic behavior with coercivity of 101 Oe, saturation magnetization of 12.6 emu g(-1), and remanent magnetization of 3.13 emu g(-1) at room temperature. The enhanced magnetic performance was attributed to the homogeneous dispersion of Fe2O3 nanoparticles in graphene matrix and such nanocomposites are promising materials for applications in magnetic media and energy storage.
石墨烯因其独特的二维纳米结构以及优异的电学、热学和力学性能，被认为是纳米复合材料中碳纳米管的替代物。在本研究中，我们提出了一种通过溶液混合将氧化铁（Fe2O3）纳米颗粒沉积到石墨烯片上的一步法。对合成后的复合材料的形貌、结晶度和磁性进行了研究。结果表明，高度结晶的Fe2O3纳米颗粒致密且均匀地包覆在石墨烯表面。磁性测量结果显示，与原始石墨烯的弱抗磁性相比，石墨烯-Fe2O3纳米复合材料在室温下表现出铁磁行为，矫顽力为101 Oe，饱和磁化强度为12.6 emu g(-1)，剩余磁化强度为3.13 emu g(-1)。磁性能的增强归因于Fe2O3纳米颗粒在石墨烯基体中的均匀分散，并且这种纳米复合材料是用于磁介质和能量存储应用的有前途的材料。
