Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 198, Issue -, Pages 511-519Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2012.11.015
Keywords
Titanium dioxide; Transition metal impurities; Band gap; Optical absorption; Photocatalytic activity
Funding
- National Academy of Sciences of Ukraine under the Research Program Nanophysics and Nanoelectronics [VC-157]
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The effect of nanocrystalline TiO2 doping with transition metal cations (Cu2+, Fe3+, Co2+, Cr3+) on their optical absorption and photocatalytic properties was investigated. The obtained metal-doped TiO2 samples were characterized by X-ray diffraction, scanning electron microscopy, and UV-vis absorption spectroscopy. It is shown that doping effect on anatase (A) and rutile (R) properties is quite different, being much stronger and complicated on A than on R. Contrary to doped R, doped A revealed a significant red shift of the absorption edge along with the band gap narrowing. Photocatalytic activity of anatase increases upon doping in the order: A < A/Co < A/Cu < A/Fe. On the contrary, photocatalytic activity of rutile samples decreases upon doping in the series R > R/Co > R/Cu > R/Fe > R/Cr, indicating the inhibitory effect of impurity cations. This fact correlates with the decrease in the UV absorption of the doped rutile in the region of the Hg-lamp irradiation at 4.88 eV. (c) 2012 Published by Elsevier Inc.
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