Synthesis and characterization of high dispersed TiO2

Abstract

High dispersed TiO2 powders with specific surface area up to 220 m2/g have been obtained. The nanosized particles with average dimensions from 8.7 to 31.3 nm have been measured. The sol–gel samples are treated from 80 to 700°C. The results obtained by DTA and XRD show that DTA-, TG- and DTG-stability curves exist in the region from 400 to 700°C. An anatase phase formation in the region up to 420–440°C has been checked. Pure rutile phase is detected at 700°C. IR spectroscopy study confirms DTA and XRD data for phase evolution from low crystalline phase via anatase to rutile one. According to optical measurements AcAc precursor used leads to a high dispersion level of the particles; the band gap is 3.9 eV measured on the TiO2 thin films.