A comparative study of optical absorption and photocatalytic properties of nanocrystalline single-phase anatase and rutile TiO{sub 2} doped with transition metal cations

Journal Article · Fri Feb 15 00:00:00 EST 2013 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2012.11.015· OSTI ID:22150059

Shymanovska, V.; Gavrilko, T.; Naumov, V. ^[1]; Kshnyakin, V. ^[2]; Khalyavka, T. ^[3]

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1. Department of Photoactivity, Institute of Physics, National Academy of Sciences of Ukraine, Prospect Nauki 46, Kiev 03650 (Ukraine)
2. Department of Physics, Sumy State University, Rymsky-Korsakov Str. 2, Sumy 40007 (Ukraine)
3. Laboratory of Photochemistry of Disperse Materials, Institute for Sorption and Problems of Endoecology, National Academy of Sciences of Ukraine, Gen. Naumov Str. 13, Kiev 03164 (Ukraine)

The effect of nanocrystalline TiO{sub 2} doping with transition metal cations (Cu{sup 2+}, Fe{sup 3+}, Co{sup 2+}, Cr{sup 3+}) on their optical absorption and photocatalytic properties was investigated. The obtained metal-doped TiO{sub 2} 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: AR/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. - Graphical abstract: A red shift of the absorption edge of nanocrystalline single-phase anatase after doping with transition metal cations. Highlights: Black-Right-Pointing-Pointer Single-phase anatase and rutile powders surface-doped with transition metal cations. Black-Right-Pointing-Pointer Absorption edge and band gap of rutile do not change with surface doping. Black-Right-Pointing-Pointer Band gap of surface-doped anatase reduces being the lowest for A/Fe. Black-Right-Pointing-Pointer The surface-doping improves photocatalytic activity of anatase. Black-Right-Pointing-Pointer The surface-doping inhibits photocatalytic activity of rutile.

• OSTI ID: 22150059
• Journal Information: Journal of Solid State Chemistry, Vol. 198; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
ABSORPTION SPECTROSCOPY
CATIONS
CHROMIUM IONS
COBALT IONS
COPPER IONS
CRYSTALS
DOPED MATERIALS
ELECTRONIC STRUCTURE
IRON IONS
NANOSTRUCTURES
PHOTOCATALYSIS
RUTILE
SCANNING ELECTRON MICROSCOPY
SURFACES
TITANIUM OXIDES
TRANSITION ELEMENTS
X-RAY DIFFRACTION