Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)
O 14.25: Poster
Montag, 27. März 2006, 18:00–21:00, P2
Structural and Chemical Analysis of Epitactic Rutile TiO2(011) Films Grown on Re(1010) — •Wilhelmine Kudernatsch, Dirk Rosenthal, and Klaus Christmann — Institut für physikalische und theoretische Chemie, FU Berlin, Germany
Titanium oxide films were grown on a Re(1010) surface by electron beam deposition. Composition and structure were determined by X-ray photoelectron and Auger electron spectroscopy as well as by low energy electron diffraction (LEED) and X-ray diffraction (XRD) measurements carried out at BESSY. The chemical activity of our films was examined by temperature programmed desorption (TPD) of CO, CO2 and H2O. TiO2 films with a well-defined stoichiometry and surface structure require high temperature deposition (T = 900 K) in an O2 atmosphere as indicated by a unique pg(2x2) LEED pattern with missing spots in h = n ± 1/2 and k = 0 positions. While this pattern could stem from both a rutile(011)-(2x1) or a brookite(001) surface, XRD and LEED faceting analyses reveal that the actual phase consists of rutile(011). CO-TPD from this phase shows a single TD state at 132 K; the CO saturation coverage could be determined to be 1.15 x 1018 / m2 (= 0.56 CO molecules per TiO2(011)-(2x1) unit mesh). Our CO, CO2 and H2O data will be discussed and compared with related work recently published in the literature.