Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 95: Metal Substrates: Adsorption of Atoms and Inorganic Molecules

O 95.9: Talk

Thursday, March 23, 2017, 17:15–17:30, WIL A317

The chemical properties of PtCu/Ru(0001) monolayer surface alloys — •Thomas Diemant and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, Albert-Einstein-Allee 47, D-89081 Ulm

Bimetallic catalysts are well known for their unusual catalytic properties, which often excel those of the respective individual components with respect to activity, selectivity or long term stability. Studies of the adsorption / reaction properties of bimetallic model surfaces with defined structure and composition can contribute significantly to an improved understanding of the microscopic origin of this effect.

We studied the chemical properties of structurally well-defined CuPt monolayer surface alloys by temperature programmed desorption (TPD) and IR measurements using CO as probe molecule. These surface alloys were created by sequential deposition of Cu and Pt on a Ru(0001) surface; their structural properties were clarified already before by our group using scanning tunnelling microscopy (STM) with chemical contrast [1]. We studied the change of the chemical properties (CO adsorption) of the alloy layers as a function of the alloy composition. We will correlate our findings to the results of structural characterization and compare to a previous study of similar type on the CO adsorption on PdCu/Ru(0001) monolayer surface alloys [2].

[1] A. Engstfeld et al., Surf. Sci. 643 (2016) 65. [2] T. Hager et al., Surf. Sci. 558 (2004) 181.