Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 53: Solid / liquid interfaces III

O 53.6: Vortrag

Mittwoch, 16. März 2011, 16:15–16:30, WIL C107

Quantitative studies of adsorbate diffusion and interactions at Cu(100)-electrolyte interfaces by in situ Video-STM — •Andriy Taranovskyy, Sophie Guézo, Yaw-Chia Yang, Hisayoshi Matsushima, Tunay Tansel, and Olaf Magnussen — Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel, Germany

Quantitative data for adsorbate tracer diffusion and adsorbate-adsorbate interactions at solid-liquid interfaces were obtained from the analysis of high-speed in situ STM data [1,2]. Here we present a comparison of the results for lead, sulphur and methyl thiolate adsorbates on Cu(100) electrodes in 0.01 M HCl. Even though the mobility of these different adsorbate species can differ by one or two orders of magnitude, it exhibits a similar potential dependence, with the hopping rates increasing towards negative electrode potentials. This could be explained by the strong influence of the coadsorbate layer on the hopping process. Furthermore, the adsorbate-adsorbate interactions of sulphur and thiolate depend on the lattice direction, whereas those of lead are attractive for the nearest and next nearest sites, as expected for metal adatoms.

[1] T. Tansel, O.M. Magnussen, Phys. Rev. Lett. 96, 026101 (2006). [2] A. Taranovskyy, T. Tansel, O.M. Magnussen, Phys. Rev. Lett. 104, 106101 (2010).