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O: Fachverband Oberflächenphysik

O 15: Solid-Liquid Interfaces: Structure, Spectroscopy II

O 15.3: Vortrag

Montag, 20. März 2017, 15:30–15:45, WIL B321

STM investigation on the adsorption of water on Ru(0001) - Influence of temperature and coadsorbed CO — •Martin Schilling, Laura Friedrich, Sylvain Brimaud, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, 89069 Ulm, Germany

The interaction of water with metal surfaces is of particular interest as model for the solid-liquid interface, and has therefore been studied intensely [1]. Besides adsorbate-metal interactions, also intermolecular interactions were found to play an important role. The situation becomes even more complex for the coadsorption of two adsorbing species.
Here we present results of a low temperature scanning tunnelling microscopy (STM) study on the structure of adsorbed water and water co-adsorbed with CO on Ru(0001), which was performed under ultrahigh vacuum (UHV) conditions. For the adsorption of water we found distinctly different adsorbate arrangements, depending on the adsorption temperature (100 - 150 K). For deposition temperatures of 120 - 150 K, well-ordered stripe structures can be formed.
Post-exposure of such surfaces to CO revealed that only little CO was adsorbed in the areas between the stripes formed by adsorbed water, indicating that these areas are not bare Ru(0001) but (partly) covered by a dilute adsorbate layer that is not resolved in STM images. Different possibilities are discussed. Finally we investigated the influence of the dosing sequence on the structure of the resulting adlayer.
J. Carrasco et al., Nat. Mater. 11 (2012) 667