In situ synthesis of graphene/cobalt nanocomposites and their magnetic properties |
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Authors: | Zhenyuan JiXiaoping Shen You SongGuoxing Zhu |
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Affiliation: | a School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China b State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China |
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Abstract: | Graphene, which possesses unique nanostructure and excellent properties, is considered as a low cost alternative to carbon nanotubes in nanocomposites. In this study, we present a simple in situ approach for the deposition of cobalt (Co) nanoparticles onto surfaces of graphene sheets by hydrazine hydrate reduction. The as-synthesized composites were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, transmission electron microscopy (TEM) and thermogravimetry and differential scanning calorimetry. It was shown that the as-formed Co nanoparticles were densely and homogeneously deposited on the surfaces of the graphene sheets and as a result, the restacking of the as-reduced graphene sheets was effectively inhibited. Magnetic studies reveal that the graphene/Co nanocomposite displays ferromagnetic behavior with saturation magnetizations of 53.4 emu g−1, remanent magnetization of 6.0 emu g−1 and coercivity of 226 Oe at room temperature, which make it promising for practical applications in future nanotechnology. |
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Keywords: | Graphene Cobalt Synthesis Nanocomposites Magnetic properties |
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