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 14.28: Poster

Montag, 27. März 2006, 18:00–21:00, P2

Growth and Structure of Titanium Dioxide Films on a Rhenium(0001) Surface — •Susanne Roth, Dirk Rosenthal, and Klaus Christmann — Institut für Chemie und Biochemie, FU Berlin

Titanium dioxide films of various thickness were grown onto a Re(0001) surface at 800 - 900 K via co-deposition of titanium and oxygen in UHV. Growth, stoichiometry, and surface structure were determined using X-ray photoelectron spectroscopy (XPS), ion scattering spectroscopy (ISS), and low-energy electron diffraction (LEED) as a function of film thickness. XPS unambiguously showed that all films possess TiO₂ stoichiometry. Since the Re substrate ion scattering signal disappeared after deposition of a monolayer equivalent of TiO₂ the thin film growth could be governed by both a Stranski-Krastanov (SK) and a Frank-van der Merwe (FW) mechanism. The TiO₂ phase exhibits a clear hexagonal LEED pattern with running spots indicating faceting phenomena due to island growth. Therefore we favour a SK growth mechanism. Our results are discussed and compared with previous data published in the recent literature on similar systems.