title: High resolution photoemission and x-ray absorption spectroscopy of a lepidocrocite-like TiO2 nanosheet on Pt(110) (1 × 2).
abstract: The electronic structure of TiO(2) nanosheets on the Pt(110)-(1 × 2) surface has been investigated by using high resolution photoemission spectroscopy and x-ray absorption spectroscopy (XAS). The Ti 2p XAS spectra of the deposited TiO(2) films have been theoretically evaluated and, from the comparison with the experimental data, the assignment to a lepidocrocite-like structure is confirmed. Coexistence of TiO(2) islands with PtO(2) stripes for incomplete nanosheets is confirmed by high resolution photoemission data. The location of the valence and conduction band edges of the nanosheet has been experimentally determined allowing us to describe in details subtle electronic effects due to the interface with the substrate. The locations of the valence band maximum and the leading peak in the O 1s XAS spectrum indicate a band gap similar to anatase but with the Fermi level closer to mid-gap than found for bulk, n-type TiO(2).
authors.affiliation: Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway.
authors.forename: L E
authors.initials: LE
authors.lastname: Walle
authors.forename: S
authors.initials: S
authors.lastname: Agnoli
authors.forename: I-H
authors.initials: IH
authors.lastname: Svenum
authors.forename: A
authors.initials: A
authors.lastname: Borg
authors.forename: L
authors.initials: L
authors.lastname: Artiglia
authors.forename: P
authors.initials: P
authors.lastname: Krüger
authors.forename: A
authors.initials: A
authors.lastname: Sandell
authors.forename: G
authors.initials: G
authors.lastname: Granozzi
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D056928:X-Ray Absorption Spectroscopy
chemical_list: D005290:Ferric Compounds; C009495:titanium dioxide; C000499:ferric oxide; D010984:Platinum; D014025:Titanium