Journal
COMPTES RENDUS CHIMIE
Volume 17, Issue 4, Pages 352-358Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crci.2013.01.023
Keywords
Co3O4; Nanoparticles; Solvent-free synthesis; Thermal treatment
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Funding
- council of Iran National Science Foundation
- University of Kashan [159271/52]
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Using solid complex molecular precursor [bis(salicylaldehyde)ethylenediiminecobalt(II)], [Co(salen)], a simple and surfactant-free method to synthesize Co3O4 nanoparticles was proposed. Cubic-phase C nanoparticles of size 30-50-nm could be produced by thermal treatment of the Co(salen) in the air at 500 degrees C for 5 h. The as-prepared samples were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The optical absorption spectrum indicates that the direct band gaps of Co3O4 nanoparticles are 1.53 and 2.02 eV. The optical property test indicates that the absorption peak of the nanoparticles shifts towards short wavelengths, and the blue shift phenomenon might be ascribed to the quantum effect. The hysteresis loops of the obtained samples reveal their ferromagnetic behavior, an enhanced coercivity (H-c) and a decreased saturation magnetization (M-s) as compared to their respective bulk materials. (C) 2014 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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