Citation: XIE Peng-Cheng, HUANG Jie. Visible-Light Photocatalytic Properties of Ti1-xVxO2 Films with Dominant {211} Facets Deposited at Room Temperature[J]. Chinese Journal of Inorganic Chemistry, ;2015, (11): 2197-2204. doi: 10.11862/CJIC.2015.279
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Ti1-xVxO2 films with dominant {211} facets were deposited by direct current reactive magnetron sputtering with Ti and Vtargets (99.99% purity) at room temperature. We study the composition, crystal structure and visible-light photocatalytic properties of the films as a function of power of Vtarget. The results showed that crystal phase of Ti1-xVxO2 films was anatase with (211) preferred orientation, but the films deposited at different power of Vtarget had different crystallinities. With the increase of power of Vtarget, the relative contents of Velement increased gradually, meanwhile, crystal grain and deposition rate also increased. In addition, the surface roughness of the film had a maximum value when the power of Vtarget was 150 W. The addition of Velement gives rise to the band gap of TiO2 films narrowing down. As a result, the optical absorption edge of the Ti1-xVxO2 films shifts towards visible-light zone, improving the visible-light photocatalytic activity of the films. When the power of Vtarget came to 150 W, the value of band gap of the Ti1-xVxO2 film was about 2.82 eV, and the film degraded ~80% RhBdyes after 2 h visible-light irradiation. This can be attributed to the synergistic effect of narrow band gap, high energy facet {211}, and high crystallinity.
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