Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 68: Poster: Scanning Probe Techniques: Method Development

O 68.11: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster C

Development of a Fast In Situ Scanning Tunneling Microscope for Studies of Electrochemical Interfaces — •Knud Schröter, Fabian Schröfel, Matthias Greve, Karsten Tarhouni, and Olaf Magnussen — Institut für Experimentelle und Angewandte Physik, Kiel

The atomic-scale understanding of processes at the interface between solid electrodes and liquid electrolytes is of high importance for electrochemical energy storage and conversion. Electrochemical scanning tunneling microscopy (ECSTM) is a key technique for the investigation of these interfaces and as such, it has seen widespread use. However, image acquisition in conventional ECSTM is a rather slow process, requiring tens of seconds or minutes per image. To help understand the precise reaction mechanisms of atomic and molecular species at solid-liquid interfaces, their movement and interactions need to be resolved.

For this, high-speed STMs capable of operating at rates >10 images per second are necessary. However, this technique has not been widely employed, mainly because of the instrumental requirements.

In this contribution, we present a new high-speed ECSTM developed and built in our group based on a Nanonis SPM controller. The instrument includes a novel scanner design with two independent piezo stacks for slow wide-range motion and local high-speed motion and a custom high-bandwidth preamplifier integrated into the scan head as close as possible to the tip. We will show first results on the implementation of the fast imaging mode.

Keywords: STM