Abstract

Nanopowders of titanium dioxide (TiO_2) incorporating the transition metal element(s) were synthesized by flame synthesis method. Single element among Fe(III), Cr(III), and Zn(II) was doped into the interior of TiO_2 crystal; bimetal doping of Fe and Zn was also made. The characteristics of transition-metal-doped TiO_2 nanopowders in the particle feature, crystallography and electronic structures were determined with various analytical tools. The chemical bond of Fe-O-Zn was confirmed to exist in the bimetal-doped TiO_2 nanopowders incorporating Fe-Zn. The transition element incorporated in the TiO_2 was attributed to affect both Ti 3d orbital and O 2p orbital by NEXAFS measurement. The bimetal-doped TiO_2 nanopowder showed light absorption over more wide wavelength range than the single-doped TiO_2 nanopowders.

• Keywords: Co-doped;Nanopowder;Flame synthesis;Electronic structure;