EXPLORING NOVEL CATALYSTS FOR THE CHEMICAL VAPOR DEPOSITION SYNTHESIS, AND CHARACTERIZATION OF ZINC AND GALLIUM OXIDE NANOSTRUCTURES
Zinc oxide (ZnO) possesses a non-centrosymmetric structure, which imparts it with piezoelectric properties, rendering it appealing for various technological applications involving nanostructured ZnO. In this investigation, the growth of ZnO surface structures was examined using Magnetite-Catalyzed Chemical Vapor Deposition (CVD). The CVD technique offered control over reaction time, enabling precise growth of ZnO structures. Incorporating catalytic layers of magnetite nanoparticles promoted nucleation and facilitated the development of a distinct morphology resembling interconnected microsized flakes as observed through scanning electron microscopy (SEM). Also in this study, the impact of pressure on the morphology and photoluminescence properties of ZnO nanostructures synthesized through chemical vapor deposition (CVD) was explored. X-ray diffraction (XRD) analysis revealed changes in crystalline quality, size, and orientation of ZnO nanostructures at different pressure conditions. Scanning Electron Microscopy (SEM) showed distinct morphologies, such as hexagonal rods and randomly arranged nanowires. X-ray fluorescence (XRF) analysis provided information about the elemental composition, and photoluminescence measurements indicated excitonic and defect-related emissions. These findings demonstrate the significance of pressure in shaping the characteristics of ZnO nanostructures for potential nanodevice applications. Lastly, the synthesis of Ga2O3 nanostructures using chemical vapor deposition (CVD) was explored. The growth mechanism involved metal adsorption on gold droplets on a heated substrate, followed by v oxygen integration into the nanowire's crystal lattice. X-ray diffraction confirmed specific lattice planes and orientations in the nanowires, with preferential alignment along the c-axis direction. SEM images showed well-controlled and uniform growth, with an average thickness of 65 nanometers. The β-Ga2O3 nanowires also demonstrated optical emission properties within the visible range.