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TiOx thin films grown on Pd(100) and Pd(111) by chemical vapor deposition
Norwegian Univ Sci & Technol, Dept Phys, NO-7491 Trondheim, Norway..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
Chalmers, Competence Ctr Catalysis, SE-41296 Gothenburg, Sweden.;Chalmers, Dept Appl Phys, SE-41296 Gothenburg, Sweden..
Norwegian Univ Sci & Technol, Dept Chem Engn, NO-7491 Trondheim, Norway..
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2016 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 649, 80-89 p.Article in journal (Refereed) PublishedText
Abstract [en]

The growth of ultrathin TiOx (0 <= x <= 2) films on Pd(100) and Pd(111) surfaces by chemical vapor deposition (CVD), using Titanium(IV)isopropoxide (TTIP) as precursor, has been investigated by high resolution photoelectron spectroscopy, low energy electron diffraction and scanning tunneling microscopy. Three different TiOx phases and one Pd-Ti alloy phase have been identified for both surfaces. The Pd-Ti alloy phase is observed at the initial stages of film growth. Density functional theory (DFT) calculations for Pd(100) and Pd(111) suggest that Ti is alloyed into the second layer of the substrate. Increasing the TTIP dose yields a wetting layer comprising Ti2+ species (TiOx, x similar to 0.75). On Pd(100), this phase exhibits a mixture of structures with (3 x 5) and (4 x 5) periodicity with respect to the Pd(100) substrate, while an incommensurate structure is formed on Pd(111). Most importantly, on both surfaces this phase consists of a zigzag pattern similar to observations on other reactive metal surfaces. Further increase in coverage results in growth of a fully oxidized (TiO2) phase on top of the partially oxidized layer. Preliminary investigations indicate that the fully oxidized phase on both Pd(100) and Pd(111) may be the TiO2(B) phase.

Place, publisher, year, edition, pages
2016. Vol. 649, 80-89 p.
Keyword [en]
Photoemission spectroscopy, Low energy electron diffraction, Scanning tunneling microscopy, TiOx thin films, Pd, Density functional calculations
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-300062DOI: 10.1016/j.susc.2016.02.002ISI: 000379097000013OAI: oai:DiVA.org:uu-300062DiVA: diva2:950762
Funder
Swedish Energy Agency, 36642-1Swedish Research Council, 2011-3532 621-2014-4708Carl Tryggers foundation , CTS 12:417The Crafoord Foundation, 20060599
Available from: 2016-08-02 Created: 2016-08-02 Last updated: 2016-08-02Bibliographically approved

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