Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 23: Poster Monday: Nanostructures 1

O 23.2: Poster

Monday, September 5, 2022, 18:00–20:00, P4

Pulling individual polar molecular wires off of a surface — •Christophe Nacci and Leonhard Grill — Department of Physical Chemistry, University of Graz, 8010 Graz, Austria

The frictional properties of individual nanostructures are strongly influenced by the reduced size and low dimensionality. Accordingly, challenging experiments are required to measure them. Probing the mechanical response of individual nanostructures on chemically different surfaces opens the possibility to explore how the static and dynamic friction depends on the interplay between structural commensurability and chemical composition. Here, we report the vertical pulling of DAD molecular wires [1] off metal surfaces by non-contact atomic force microscopy (AFM), performed under ultrahigh vacuum and at low temperatures. These are polar wires with alternating donor (D) and acceptor (A) groups incorporated in their chemical structure. The aim is to probe the mechanical response of individual molecular wires by force spectroscopy. To furthermore explore the role of structural commensurability between polymers and surface, the polar wires are grown on a variety of different surfaces, from stepped and corrugated surfaces to ultrathin insulating NaCl films on metal surfaces.

[1] C. Nacci et al., Nature Comm. 6, 7397 (2015)