Please use this identifier to cite or link to this item:
Title: Atomic N modified rutile TiO2(110) surface layer with significant visible light photoactivity
Authors: Tao, J.
Yang, M. 
Chai, J.W.
Pan, J.S.
Feng, Y.P. 
Wang, S.J.
Issue Date: 16-Jan-2014
Citation: Tao, J., Yang, M., Chai, J.W., Pan, J.S., Feng, Y.P., Wang, S.J. (2014-01-16). Atomic N modified rutile TiO2(110) surface layer with significant visible light photoactivity. Journal of Physical Chemistry C 118 (2) : 994-1000. ScholarBank@NUS Repository.
Abstract: It has been recently emphasized that the surface of a photocatalyst plays crucial roles on its photocatalytic performance. By nitridizing the top layer of the rutile TiO2(110) surface using reactive atomic N flux, we report direct experimental evidence of significantly enhanced photocatalytic activity under both ultraviolet (UV) and visible light irradiations. The visible light activity of a nitridized surface is found to be comparable to the UV light activity of the pristine surface. On the basis of X-ray photoemission spectroscopy (XPS) measurements and density-functional theory (DFT) calculations, top surface N doping efficiently narrows the local band gap, ∼2.0 eV, which accounts for the visible light activity. Under visible light excitation, nearly all free charges contribute to the photocatalytic reactions. The improvement of photocatalytic activity is attributed to the N 2p add-on shoulder at the valence band maximum (VBM) as well as the strong exchange-splitting at the surface that settles the N 2pz states inside the conduction band of the TiO2 matrix, which avails efficient charge transfer. © 2013 American Chemical Society.
Source Title: Journal of Physical Chemistry C
ISSN: 19327447
DOI: 10.1021/jp408798f
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Jan 28, 2023


checked on Jan 19, 2023

Page view(s)

checked on Jan 26, 2023

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.