Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 27: Graphene II

O 27.8: Talk

Tuesday, March 27, 2012, 12:15–12:30, MA 041

Adsorption of polar molecules on graphene Ni(111) by substrate sensitive NEXAFS spectroscopy. — •Stefan Böttcher, Martin Weser, Hendrik Vita, Yuriy Dedkov, and Karsten Horn — Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany

On account of its unusual properties, graphene has attracted an enormous interest. However, the interaction of graphene with metals and other adsorbates is still not well understood, for example the strength of its interaction with different metals. Here we investigate the adsorption of water and ammonia molecules on single layer graphene films grown on Ni(111), a lattice matched system. We use NEXAFS at the substrate carbon 1s and the adsorbate N 1s and O 1s absorption edges, and complement these data by angle resolved valence band photoemission. The data are compared with DFT calculations to assign possible adsorption geometries. The unique possibility to study adsorption-induced NEXAFS features in the substrate permits an analysis of the adsorbate-substrate interaction mechanism beyond a simple physisorption model.