Iranian Nanotechnology Society International Journal of Nanoscience and Nanotechnology 1735-7004 9 1 2013 03 01 Characterization of Cobalt Oxide Co3O4 Nanoparticles Prepared by Various Methods: Effect of Calcination Temperatures on Size, Dimension and Catalytic Decomposition of Hydrogen Peroxide 51 58 3880 EN S. L. Sharifi Chemistry Department of Imam Hussein University, Tehran, I. R. Iran H. R. Shakur Physics Department of Imam Hussein University, Tehran, I. R. Iran A. Mirzaei Chemistry Department of Imam Hussein University, Tehran, I. R. Iran M. H. Hosseini Chemistry Department of Imam Hussein University, Tehran, I. R. Iran Journal Article 2012 12 10 In this scientific research work we report a novel method to synthesis Co3O4 nanoparticles via calcinations of cobalt hydroxide which can be conveniently prepared by the Co(NO3 )2.6H2O with different reactants. In order to study the effect of calcination temperature on structure and morphology of the nanoparticles, the calcinations take place at various temperatures (at 300°C, 500°C and 700°C). The nature of cobalt oxide species depending on heat treatment. The samples at low temperature show decrease on size and dimension. The characteristics of the nanoparticles were investigated by XRD patterns, IR spectroscopy and scanning electron microscopy (SEM). It indicates that at higher temperature, greater nanoparticles were produced. Decomposition of H2O2 showed that calcination at 300°C result to higher activity. https://www.ijnnonline.net/article_3880_0dd1bc593a91620daecf7723d2235624.pdf