La synthèse des nano particules de CuO avec la méthode de précipitation sol_ gel

Abstract

The object of this thesis is the synthesis and characterization of the copper oxide powders “CuO” and its composite thin film of (CuO/PMMA), by (sol-gel) process (wet-chemistry route), also the comparison between two methods of preparation using two different precursors. The Work was divided into two parts: The first part allowed to the preparation of the “CuO” powder, and its composite thin film of (CuO/PMMA), by the precursor (CuCl2, 2H2O), and the study of its structural, morphological, and optical properties, we also study in this part the annealing temperature effect on the size of CuO crystallites. The second part was dedicated to prepare the CuO powder, and its composite thin film (CuO/PMMA), by precursor (Cu (CH3COO) 2, H2O), and DMF (CH3) 2 NC (OH), as solvent, and also the study of the structural, and optical properties. Various analysis techniques have been used to characterize the CuO powders and its composite (CuO/PMMA) 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. - Optical properties and band gap of CuO were studied by UV-Vis spectroscopy. For the CuO powders prepared by the first precursor (CuCl2, 2H2O), and with different annealing temperatures, the study by x-rays diffraction (XRD) reveals single phase monoclinic structure of CuO, the average crystallite size increased with increasing of annealing temperature. For the powder CuO to prepare with the second precursor (Cu (CH3COO) 2, H2O) the study by the x-rays diffraction(XRD) , reveals single phase monoclinic structure of CuO, the average crystallite size of the powder annealed to 450 C° is 16,76nm. The study of the optical properties of the CuO/PMMA composite thin films by the two methods has shown a band gap is estimated to be 3, 90 eV.