Synthesis of CoO and Co3O4 Nanoparticles by Salt-Assisted Combustion Method

Ming Wei Ji; Zhen Ye Ma; Juan Xu; Li Xiong Zhang; Feng Qi Zhao

doi:10.4028/www.scientific.net/AMR.554-556.741

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 554-556Synthesis of CoO and Co3O4 Nanoparticles by...

Synthesis of CoO and Co₃O₄ Nanoparticles by Salt-Assisted Combustion Method

Abstract:

In the present study, CoO, which is hard to synthesize because of the chemical activity of cobalt metal, and the popular Co₃O₄ have been successfully controlled produced by a salt-assisted combustion method (SACM), in which Co(NO₃)₂•6H₂O, polyethylene glycol (PEG2000) were chosen as oxidant and fuel respectively. The CoO and Co₃O₄ nanoparticles were investigated by high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), x-ray diffraction (XRD), simultaneous thermogravimetric and differential thermal analysis (TG-DTA) and N₂ adsorption. It is found that the pure CoO were obtained whatever adjusting the weight ratio of Co(NO₃)₂•6H₂O and PEG2000 in the absence of inert salt. While, well-dispersed Co3O4 nanoparticles with a high specific surface area were successfully obtained with the introduction of NaCl or KCl in the system, which results from the fact that the introduction of inert inorganic salt as a agglomeration inhibitor into the redox mixture precursor led to the breakup of fractal nanocrystallite agglomerates. A mechanism was proposed to illustrate the possible formation processes and the role of the inert inorganic salt.