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Issue 4, 2010
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A critical evaluation of the mode of incorporation of nitrogen in doped anatase photocatalysts

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Abstract

A range of sol–gel synthesis conditions were used to prepare high surface area N-doped TiO2 in the anatase phase. The N dopant was derived either from NH3 in solution or from NH3 gas bubbled through solution. Bulk N doping levels were determined by an inert gas fusion method and were compared with surface N doping levels determined by X-ray photoelectron spectroscopy. Comparison was also made with the concentration of paramagnetic species measured by electron spin resonance spectroscopy. It was found that both surface and bulk doping levels were typically around 3 orders of magnitude higher than the concentration of paramagnetic N-containing species. All N-doped samples showed higher visible region (λ > 395 nm) photocatalytic activity than undoped anatase itself. It is argued that catalytic activity is associated with the presence of nitrogen bound to lattice oxygen to give Image ID:b914733k-t1.gif which can be photoexcited to give (NO)×O.

Graphical abstract: A critical evaluation of the mode of incorporation of nitrogen in doped anatase photocatalysts

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Publication details

The article was received on 29 Jul 2009, accepted on 11 Nov 2009 and first published on 07 Dec 2009


Article type: Paper
DOI: 10.1039/B914733K
Citation: Phys. Chem. Chem. Phys., 2010,12, 960-969
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    A critical evaluation of the mode of incorporation of nitrogen in doped anatase photocatalysts

    F. E. Oropeza, J. Harmer, R. G. Egdell and R. G. Palgrave, Phys. Chem. Chem. Phys., 2010, 12, 960
    DOI: 10.1039/B914733K

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