Browsing by Author "A. DJELLOUL"

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    Preparation and Characterization of Metal Oxide Thin Films for Photocatalytic Environmental Remediation
    (2026) A. DJELLOUL
    This research aims to fabricate metal oxide thin films using the sol-gel dip coating method and to examine their effectiveness in the photocatalyt ic degradat ion of various solvent (ethanolmethanol) on a glass substrate, with applications in photocatalysis and photodetection, respectively. We examined the structural, morphological, optical, and electrical characterist ics of these films using various methods. X-ray diffraction patterns demonstrate that all films are polycrystalline and consist of a hexagonal wurtzite structure. The Mg-doped ZnO thin films, produced using ethanol solvent, have a preferential orientation along (002), with Scherer's formula indicat ing crystallite sizes between 22.82 and 36.07 nm. layers composed of thin layers of Na-doped ZnO and Mg-doped ZnO thin films were subjected to morphological analysis by scanning electron microscopy (SEM), revealing surfaces that were dense, homogeneous, and smooth. The EDS analysis ident ified peaks associated with the elements zinc, oxygen, magnesium, and sodium. Consequent ly, the composit ion of the thin films is validated, with the optical transparency of ZnO films approximat ing 90% within the visible spectrum, owing to their exceptional crystalline qualit y. The direct band gap varied from 3.22 to 3. 38 eV, whereas FT-IR spectra confirm the presence of ZnO and the effect ive incorporation of magnesium and sodium, corroborating the XRD findings. The analysis of photoluminescence mostly showed emission peaks. The outcomes of photocatalysis have shown that the incorporation of magnesium (Mg) and sodium (Na) into zinc oxide augments photocatalyt ic efficiency. The best degradation of the dye methyl blue under UV irradiat ion attains 99.91% after 2 hours, using thin layers of ZnO synt hesized with methanol solvent and doped with 9% Mg. The inclusion of doping increases electrical conduct ivit y levels. Magnesium and sodium doping provide enhanced structural and electrical characterist ics relat ive to elemental silver.
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    PROPRIETES ELECTRIQUES DES COUCHES MINCES D’OXYDE DE ZINC
    (2004-01-14) A. DJELLOUL
    We have investigated the growth conditions on the electric properties of ZnO thin films. Samples were deposited on (1010) , (0001) and (1120) Al2O3 substrates by the chemical vapor transport technique. At room temperature, the carrier concentration and Hall mobility were in the range of 21016 – 8.41018 cm-3 and 140 – 160 cm2V-1s-1, respectively. Results of temperature dependent Hall mobility measurements indicate there are different transport mechanisms at high and low temperatures