Study on preparation and EPR spectra of titanium dioxide and Fe-doped titanium dioxide materilals

The TiO2 samples and samples of TiO2 doped with Fe was prepared by sol-gel method with tetrabutyl titanate, absolute ethyl, alcoholglacial acetic acid at room temperature. The xerogel was obtained after two days at room temperature, and dried at 100Ct. And the TiO2 and Fe-doper powder samples were obtained at 500Ct. The sampels were analyzed by X-ray diffraction and EPR spectrum. The results showed that all the samples prepared in this way were anatase, and Fe was doped in theTiO2 crystal lattice. The signal intensity of Ti3+ oxidation center enhanced with the increase of Fe doped, and its peak moved to the magnetic reducing direction. Under the different test temperatures, the signal intensity of Ti3+ oxidation center in Fe-doped 0.1% of Fe-TiO2 samples enhanced with the testing temperature, and its peak also moved to the magnetic reducing direction. This phenomena was explaned according to the theory of EPR and the reaction of TiO2 and O2.