Payne, DT;
Zhang, Y;
Pang, CL;
Fielding, HH;
Thornton, G;
(2016)
Coverage-dependent two-photon photoexcitation at the H2O/TiO2 interface.
Surface Science
, 652
pp. 189-194.
10.1016/j.susc.2016.02.018.
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Abstract
Excited electrons and holes are crucial for redox reactions on metal oxide surfaces. However, precise details of this charge transfer process are not known. We report two-photon photoemission (hν = 3.23 eV) measurements of rutile TiO2(110) as a function of exposure to water below room temperature. The two-photon resonance associated with bridging hydroxyls is enhanced following water exposure, reaching a maximum at a nominal coverage of one monolayer. Higher coverages attenuate the observed resonance. Ultraviolet photoemission spectroscopy (hν = 21.22 eV) of the initial, band gap states shows little change up to one monolayer water coverage. It is likely that the enhancement arises from dissociation within the adsorbed water monolayer, although other mechanisms cannot be excluded.
Type: | Article |
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Title: | Coverage-dependent two-photon photoexcitation at the H2O/TiO2 interface |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1016/j.susc.2016.02.018 |
Publisher version: | http://dx.doi.org/10.1016/j.susc.2016.02.018 |
Language: | English |
Additional information: | Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | TiO2; Hydroxyls; Photoexcitation; Water; 2PPE |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
URI: | https://discovery.ucl.ac.uk/id/eprint/1501048 |
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