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Non-band-gap photoexcitation of hydroxylated TiO2

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. Green open access

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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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