Zhang, Y;
Payne, DT;
Pang, CL;
Fielding, HH;
Thornton, G;
(2015)
Non-band-gap photoexcitation of hydroxylated TiO2.
Journal of Physical Chemistry Letters
, 6
(17)
pp. 3391-3395.
10.1021/acs.jpclett.5b01508.
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Abstract
The photochemistry of TiO2 has been studied intensively since it was discovered that TiO2 can act as a photocatalyst. Nevertheless, it has proven difficult to establish the detailed charge-transfer processes involved, partly because the excited states involved are difficult to study. Here we present evidence of the existence of hydroxyl-induced excited states in the conduction band region. Using two-photon photoemission, we show that stepwise photoexcitation from filled band gap states lying 0.8 eV below the Fermi level of rutile TiO2(110) excites hydroxyl-induced states 2.73 eV above the Fermi level that has an onset energy of ∼3.1 eV. The onset is shifted to lower energy by the coadsorption of molecular water, which suggests a means of tuning the energy of the excited state.
| Type: | Article |
|---|---|
| Title: | Non-band-gap photoexcitation of hydroxylated TiO2 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acs.jpclett.5b01508 |
| Publisher version: | http://dx.doi.org/10.1021/acs.jpclett.5b01508 |
| Additional information: | © 2015 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. |
| 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/1473153 |
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