Journal
SURFACE SCIENCE
Volume 652, Issue -, Pages 189-194Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2016.02.018
Keywords
TiO2; Hydroxyls; Photoexcitation; Water; 2PPE
Categories
Funding
- European Research Council Advanced Grant ENERGYSURF
- EPSRC (UK) [EP/D068673/1]
- EU COST Action [CM1104]
- Royal Society (UK)
- Alexander von Humboldt Stiftung (Germany)
- EPSRC [EP/D068673/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D068673/1] Funding Source: researchfish
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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 (hv = 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 (hv = 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. (C) 2016 The Authors. Published by Elsevier B.V.
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