Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 60: Solid-liquid interfaces: Structure, Spectroscopy II

O 60.3: Talk

Wednesday, March 14, 2018, 11:00–11:15, MA 144

Potential-dependent distance-tunneling-current spectroscopy at the interface of gold(111) in an ionic liquid — •Marcel Lang, Stefan Herzog, Jeannete Lindner, and Rolf Schuster — Karlsruher Institute of Technologie, Karlsruhe, Germany

The behavior of ionic liquids at charged surfaces is fundamentally different from diluted electrolytes. For example ionic liquids form different multi-layered structures depending on the polarization of the gold electrode.

We investigated the interface [BMP][TFSA] on gold(111) using an STM under inertgas atmosphere operating at room temperature. We could observe two distincly different behaviours depending on the polarisation of the gold electrode. At potentials positive of -0.5 V vs Pt the barrier height steadily increases with distance. At potentials below -0.9 V vs Pt the barrier height shows local maxima and minima. The features in the measurements below -0.9 V vs Pt can be attributed to the structure of the first layer of the liquid.