Template synthesis and study of Co-Ni core/carbon shell nanoparticles
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2017-01-01
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Abstract
Co-Ni core/carbon-based shell nanoparticles are synthesized at room temperature by the help of a template technique, using a carbon-containing support through a chemical reduction with 0.2 M NaBH4 in a mixture of aqueous solutions of 0.1 M CoCl2.6H2O and 0.1 M NiCl2.6H2O at a ratio Co:Ni=1:1. As a support of fluorinated graphite (CF) in the presence of β-cyclodextrine (β-CDx), or respectively N-Methyl-2-pyrrolidone (NMP) and N-acetyl-Dglucosamine (NAG), is used during the reduction process. Both Scanning electron microscopy (SEM) and Energy dispersitive spectroscopy (EDS) analyses are carried out to determine the morphology and surface elemental composition. The SEM images show that the synthesized core/shell nanoparticles are too small, but definitely spherical in shape. The particles are spheroidal assemblies, because of magnetic interaction forces. It is observed that the nanoparticles are deposited among the graphite grains and surrounded with the β-CDx, NMP and NAG molecules, respectively. The ratio Co:Ni = 1:1, set in the reaction solution, is exactly reproduced in the Co-Ni nanoparticles. The prepared hybrid core/shell nanoparticles are also investigated with X-ray diffraction (XRD) and Infrared spectroscopy with Fourier transformation (FTIR) in the mid-Infrared region (4000-400 cm-1). XRD analysis proves the formation of amorphous Co-Ni nanoparticles. FTIR spectra establish the existence of different chemical bonds such as O-H, C-O, C-H, C-N, B-O, B-H, Co-O, Ni-O in the corresponding atom groups situated on the nanoparticle surface.