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Lookup NU author(s): Professor Paul Christensen,
Dr Andrew Hamnett,
Professor Wen-Feng Lin
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This Letter reports in situ Fourier transform infrared (FTIR) spectroscopic data on thermal TiO2 films fabricated by heating titanium plates in air at 475, 700 and 800 °C. The films were studied in the dark and under UV-irradiation in aqueous 0.1MNaClO4 in the presence and absence of 0.1 M Na2(OOC)2 and at 10, 25 and 50 °C. The film fabricated at 800 °C showed a broad feature near 1580cm-1 under UV-irradiation that was not observed in the dark, whilst the films fabricated at lower temperatures, 475 and 700 °C, showed no such feature. This feature appears to be associated with the accumulation of surface-mobile holes at the complex, porous film-electrolyte interface and the capacity of such holes to enhance the absorption cross-section of optical phonons characteristic of the rutile crystal form at and near the surface of the TiO2/electrolyte interface. © 2001 Elsevier Science B.V.
Author(s): Lin WF; Christensen PA; Hamnett A; Eameaim J
Publication type: Article
Publication status: Published
Journal: Chemical Physics Letters
ISSN (print): 0009-2614
ISSN (electronic): 1873-4448
Publisher: Elsevier BV
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