Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 2: Metal substrates: Solid-liquid interfaces
O 2.3: Vortrag
Montag, 22. März 2010, 11:45–12:00, H31
Pb adsorption on Cu(100) studied in situ by electrochemical video STM — •Otavio Alves1, Hisayoshi Matsushima2, Harry E. Hoster1, R. Jürgen Behm1, and Olaf Magnussen2 — 1Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany — 2Institute of Experimental and Applied Physics, Christian-Albrechts University, D-24118 Kiel, Germany
As a prototype for a lattice-mismatched system, the growth of Pb on Cu(100) was subject of various studies under ultrahigh vacuum conditions (UHV) [1-4]. It has been established that Pb grows on Cu(100) in a Stranski-Krastanov mode, with three well-defined ordered structures appearing in the submonolayer regime up to 0.6 monolayers. In this contribution, we will report on the growth of Pb on Cu(100) at the solid/liquid interface, which we observed in situ by electrochemical video scanning tunnelling microscopy (STM). At low Pb surface concentration, spontaneous formation of a surface alloy takes place on a reconstructed Cu(100). Increasing the Pb surface content leads to dealloying, finally resulting in a saturated Pb overlayer. Our in situ STM atomic-scale pictures are comparable to those obtained in UHV. Atomic Pb diffusion, dynamic structural fluctuation and coexistence of different Pb phases will be discussed.
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