Synthesis of Nickel and Cobalt Sulfide Nanoparticles Using a Low Cost Sonochemical Method
Overview
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Nickel and cobalt sulfides are promising materials in different cutting-edge research areas like solar cells, supercapacitors, catalysts, and electrode materials. Nickel and cobalt sulfides with various stoichiometries have been synthesized sonochemically from Ni(CHCOO) ∙ 4HO, Co(CHCOO) ∙ 2HO and different sulfur precursors using a direct immersion ultrasonic probe. The products were characterized by X-ray powder diffraction, transmission electron microscopy (TEM) including EDX analysis, IR and UV-Vis spectroscopy and elemental analysis. Following products have been obtained: NiS, NiS, CoS and CoS, with average crystallite sizes in the range 7-30 nm. Effects of different reaction conditions on the size, morphology and optical band-gap energy were evaluated. Optical band-gap energies in the range 3.3 eV-3.8 eV were observed for the obtained nanoparticles.
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