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 36.69: Poster

Dienstag, 1. April 2014, 18:30–22:00, P1

STM and AFM investigations of [OMIm]Tf2N on Graphite — •Rene Gustus^1,2, Timo Carstens¹, Oliver Höfft¹, and Frank Endres¹ — ¹Institut für Elektrochemie, TU Clausthal, D-38678 Clausthal-Zellerfeld, Germany — ²Institut für Energieforschung und Physikalische Technologien, TU Clausthal, D-38678 Clausthal-Zellerfeld, Germany

Electrochemical reactions can always be explained by the interaction of an electrochemically active solution with a solid surface. Besides aqueous solutions, Ionic Liquids (IL) have become an integral part of scientific research especially in electrochemistry but also in different fields of research like catalysis and solar cells, to name only a few. In this regard the physical and chemical properties of the liquid/solid interface like the adsorption mechanisms or the structure formation of the IL near the solid surface are of great interest. Here we investigated the interaction of [OMIm]Tf2N with a graphite surface (Highly Ordered Pyrolitic Graphite - HOPG) by means of scanning tunnelling (STM) and atomic force microscopy (AFM). In a first step in-situ STM measurements in an electrochemically controlled environment were performed. In addition we studied the adsorption of monolayers of [OMIm]Tf2N under UHV conditions. Therefore IL films with different thicknesses were prepared on clean HOPG by evaporation in UHV and were subsequently investigated by STM and AFM using especially force distance curves to study a potential layering of the IL at the interface.