Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.74: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Low-temperature UHV-STM investigation of adsorbed H2O on metal surfaces — •Martin Schilling, Albert K. Engstfeld, and R. Jürgen Behm — Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany
A better understanding of the elementary electrochemical/-catalytic processes on bimetallic electrode surfaces requires a detailed understanding of the solid-liquid interface, including the water-solid interaction. The latter has been studied in detail earlier, using model systems consisting of ice layers adsorbed on single crystal metal surfaces.[1]
Following these lines, we investigated the interaction of H2O with catalytically relevant mono- and bimetallic single crystal surfaces. Here we report in situ scanning tunnelling microscopy results obtained at variable temperatures (VT-STM, 95 K - RT). Submonolayers of H2O were deposited under well defined conditions under ultra high vacuum (UHV) at low temperature (∼ 95 K) on single crystal surfaces such as Au(111) or Ru(0001). Depending on the dosing conditions (H2O pressure, dosing rate, sample temperature), the thermal treatment and the substrate, the deposited H2O was found to form monolayer and/or multilayer islands or three-dimensional clusters. Correlations between structure and deposition/post-treatment conditions are discussed.
[1] P.A. Thiel and T.E. Madey, Surf. Sci. Rept. 7 (1987) 211-385