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2016
ACL
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N.Zayyoun, B.Jaber, L.Laânab, E.Ntsoenzok, R.Bekkari, 'Effect of solvent on the morphological and optical properties of CuO nanoparticles prepared by simple sol-gel process', J. Mater. Environ. Sci. 7 1791-1797 (2016)
CuO nanoparticles with different morphologies were successfully synthesized by the sol-gel method through the reduction of copper acetate in different solvents. The influence of the kind of solvent on the structural, morphological and optical properties of nanoparticles was investigated. X-ray diffraction studies showed that the nanoparticles are monoclinic in nature without secondary phases and their size depends greatly on the nature of the solvent. TEM images indicate that the obtained CuO nanoparticles are predominantly of spherical shape, with sizes in the quantum dots range (from 4 to 9.5nm). The smallest particles were obtained when using the ethanol as solvent. A net blue shift in the fundamental direct gap energy (from 4.2 to 4.9eV), attributed to the quantum confinement effect, is observed in the optical analysis when the particles size decreases. Moreover, the purity of the obtained NPs was confirmed through the Raman spectroscopy characterizations, which show the absence of any secondary phases. The downshifted peaks is attributed to the size effect.
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