Dresden 2017 – scientific programme

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MI: Fachverband Mikrosonden

MI 8: Scanning Probe Microscopy (SPM)

MI 8.2: Talk

Thursday, March 23, 2017, 10:15–10:30, MER 02

Potential dependent tunneling barrier-height measurements at the interface of gold(111) in an ionic liquid — •Marcel Lang, Jeannette Lindner, and Rolf Schuster — Karlsruhe Institute of Technology, 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 employed distance-current spectroscopy in a room temperature electrochemical-STM under ambient atmosphere to study the tunneling barrier heights in [BMP][TFSA] on gold(111). We found that the tunneling barrier vanishes at moderately positive potentials. We attribute this to the formation of ion layers at the interface, which may exhibit high intrinsic conductance.