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Chemical band structure of V-doped TiO2 nanopowder synthesized by aerosol-assisted chemical vapor synthesis 1 H. Park, 1 J.P. Ahn, 1 J.K. Park, 2 Y.S. Cho, 2 H. Sieger and 2 H. Hahn 1 Nano Materials Research Center, Korea Institute of Science and Technology 2 Thin Films Division, Darmstadt University of Technology
In the present work, we manufactured anatase TiO2 nanopowder doped with vanadium up to 10 atomic percent. The characters of powder are about 7 nm in average diameter, 240 m2/g of specific surface area, and round in shape. The TiO2 powder showed little change in size along with doped vanadium content. It was observed from the X-ray diffraction study that the lattice spacing of anatase widened with addition of vanadium element and vanadium oxide could not be detected. When the powder was heated up to 700oC, the anatase phase changed to the rutile phase and a V2O5 phase was separated from the V-doped TiO2. The V-doped TiO2 fabricated in the present study showed a red shift and large absorption in the visible light, but heat-treated V-doped TiO2 showed neither red shift nor large absorption of visible light. Occurrence of red shift and large absorption of the present TiO2 was attributed to the vibrational band of V-O in the V-doped TiO2.
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Presented at the International Congress
of Nanotechnology, November 7-10, 2004 San Francisco, USA
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