Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 84: Poster Focus Session: Structure and Chemistry of Metal-Oxide Surfaces

O 84.1: Poster

Wednesday, March 14, 2018, 18:15–20:30, Poster A

Adsorption of O₂ on Rutile (110) surface studied by Atomically-resolved AFM/STM — •Igor Sokolovic, Martin Calkovsky, Michael Schmid, Ulrike Diebold, and Martin Setvin — TU Wien, Institute of Applied Physics, Wiedner Hauptstr. 8-10/134, 1040 Vienna, Austria

The Rutile TiO₂ (110) surface is a well-studied surface, which makes it an excellent model system for testing new methods. O₂ adsorption on this surface has been studied by many techniques [1] - [4], yet there are still controversies even about the basic O₂ adsorption configurations. This contribution will show that a combined non-contact qPlus atomic force microscopy (AFM) and scanning tunneling microscopy (STM) setup provides a powerful tool for direct imaging and manipulating the adsorbed molecules. The AFM allows for completely non-intrusive measurements, showing three distinct molecularly adsorbed O₂ species. Applying sample bias results in dissociation, desorption or configuration change of the adsorbed molecules. The role of sample and dosing temperature is discussed. The adsorbates are also investigated with Kelvin probe spectroscopy and force spectroscopy. The effect of electrons and holes induced by ultraviolet light irradiation is investigated for the various adsorbed species.

References: [1] Diebold, U. Surface science reports 48.5 (2003): 53-229. [2] Du, Y., et al. The Journal of Physical Chemistry C 112.7 (2008): 2649-2653. [3] Petrik, N.G., et al. The Journal of Physical Chemistry Letters 1.12 (2010): 1758-1762. [4] Henderson, M.A., et al. The Journal of Physical Chemistry B 103.25 (1999): 5328-5337.