La synthèse des nano poudres de Cu O avec la méthode précipitation Sol-Gel en utilisant le précurseurCuSO4 et l’étude de leurs propriétés structurales et optiques

Abstract

The Sol-Gel method is a very attractive technique for elaborating materials, since it is known to be able to synthesize ,at low temperature ,both nanometric powders or materials with fine microstructure .moreover, it ensures a high chemical purity and homogeneity and also controls ,in an accurate manner ,the morphology of the synthesized materials . In the present work we have fabricated and characterized pure copper oxide powders “CuO” and its composite thin film (CuO/PMMA)by sol-gel process (wet-chemistry route) using two different precursor (CuSO4+5H2 O) and (Cu(CH3 COO)2 ,H2 O) . Various analysis techniques have been used to characterize the CuO powders and its composites thin films, they are divided into two category:  The structural analysis including the X-rays diffraction (XRD),the infrared spectroscopy(IR)and the electron scanning microscopy (MEB).  UV-Visible spectroscopy has been used for the determination of optical gap. For the CuO prepared by the first precursor (CuSO4+5H2 O) and with different annealing temperatures ,the study by X-rays diffraction (DRX) reveals single phase monoclinic structure of CuO ,the average crystallite size change with annealing temperature . For the CuO prepared by the second precursor (Cu(CH3 COO)2 ,H2 O) the study by X-rays diffraction (XRD),reveals single phase monoclinic structure of CuO ,the average crystallite size of the powder annealed to 450℃ is 16,76nm. The study of optical properties of the CuO/PMMA composite thin films by the two methods has shown a band gap is estimated to be 3.91eV.