Title of article :
In situ synthesis of graphene/cobalt nanocomposites and their magnetic properties
Author/Authors :
Ji، نويسنده , , Zhenyuan and Shen، نويسنده , , Xiaoping and Song، نويسنده , , You and Zhu، نويسنده , , Guoxing، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
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.
Keywords :
graphene , Cobalt , Synthesis , nanocomposites , Magnetic properties
Journal title :
MATERIALS SCIENCE & ENGINEERING: B
Journal title :
MATERIALS SCIENCE & ENGINEERING: B