دراسة البنى النانومترية لأكسيد التيتانيوم

Abstract

In this work, the preparation of different TiO2 nanostructures and their functionalization by simple methods such as anodization and hydrothermal was undertaken. Different techniques of analysis have been used to characterize the preparedlayers of TiO2 nanostructures on Ti substrate and related compounds. These are X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), Raman spectroscopy, UV-Visible spectroscopyandX-ray Photoelectron Spectroscopy (XPS). Anatase and rutile TiO2 in various nanostructured forms were obtained (Nanotubes, nanofibers, nanoleafs and nanowires) and analyzed. Some of these nanostructures, particularly TiO2 nanotubes and nanofibers were successfully decorated with iron oxide (Fe2O3) phase, barium titanate (BaTiO3), and calcium titante(CaTiO3) nanoparticles using various methods (hydrothermal, impregnation, and rapid flame heating).The morphology of these nanostructures considerably changed with the hydrothermal processing temperature and time. The obtained nanostructures were heat treated at different treatments both under air and vacuum in order to change their content in oxygen vacancies. Photoelectrochemical testsof the obtained various nanostructures of TiO2heat treated at 450 °C under air and 300 °C under vacuum demonstrate that TiO2 nanoleafs and nanowires have the largest photoelectrochemical currentfor samples that are treated under air. Heat treatment under vacuum was successful only in the case of TiO2 nanofibers.