Journal
POLYHEDRON
Volume 30, Issue 15, Pages 2431-2437Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2011.05.039
Keywords
Cobalt carbonate; Co3O4 nanoparticles; Band gaps (E-g); Urea; Hydrothermal synthesis
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Synthesis of submicrometer crystalline particles of cobalt carbonate was achieved hydrothermally using different cobalt salts and urea with a molar ratio from 1:3 to 1:20 (cobalt salt:urea) in aqueous solutions at 160 degrees C for 24-36 h, in the presence of cetyltrimethylammonium bromide (CTAB) as a surfactant. Nanoparticles of Co3O4, with an average size from 30 to 39 nm, were obtained by thermal decomposition of CoCO4 samples at 500 degrees C for 3 h in an electrical furnace. The as-synthesized products were characterized by powder X-ray diffraction (XRD). Fourier transform infrared spectra (FT-IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV-Vis spectra and thermal analysis. Studying the optical properties of the as-prepared cobalt oxide nanoparticles showed the presence of two band gaps, the values of which confirmed the semiconducting properties of the prepared Co3O4. (C) 2011 Elsevier Ltd. All rights reserved.
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