Structural and spectroscopic study of Fe-doped TiO2 nanoparticles |
Paper ID : 1527-UFGNSM-FULL |
Authors: |
Abstract: |
Fe doped TiO2 nanoparticles have been prepared by a sol gel method in a wide range of Fe/Ti molar ratios (1%, 3%, 5%, 8%, and 10%). Post annealing of the samples at different temperatures ranging from 400 C to 800 C was performed. Structural characterization of the samples was carried out using high resolution transmission electron microscopy (HRTEM), the mean diameter of the nanoparticles changes from ~8 nm to ~30 nm as the annealing temperature was increased. Some samples show ferromagnetic behaviour at RT, which could be promising material for spintronic application. In order to understand the source of magnetism we have investigated the electronic structure of TiO2: Fe nanoparticles by means of X-ray Photoemission Spectroscopy (XPS), X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD). The results of XPS study confirmed the presence of Fe in all samples, which could not be detected by HRTEM and revealed that Fe ions are in mixed valence (Fe2+ and Fe3+) states and the Fe3+ ions are dominant in the surface region of the nanoparticles. The whole purpose of this work was not just to find magnetic materials, but also to find a material with a strong coupling between magnetic and optical properties, so photoluminescence measurements have been studied too. |
Keywords: |
Titanium oxide, Fe-doping, spintronic, X-ray photoemission spectroscopy, X-ray absorption spectroscopy and X-ray magnetic circular dichroism. |
Status : Paper Accepted (Poster Presentation) |