SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 42: Poster: Nanostructures at Surfaces

O 42.9: Poster

Tuesday, March 28, 2023, 18:00–20:00, P2/EG

Pulling single polar molecular wires by atomic force microscopy — •Christophe Nacci and Leonhard Grill — Institute of Chemistry, University of Graz, Graz, Austria

The frictional properties of individual nanostructures are strongly influenced by the low dimensionality and reduced size. Probing how they respond mechanically on different surfaces is essential to understand how the static and dynamic friction depend on the interplay between chemical composition and structural commensurability. 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. The chemical structure of DAD polar wires is made of a regular alternation of donor (D) and acceptor (A) units. The mechanical response of single isolated molecular wires is probed by force spectroscopy. To further explore the role of structural commensurability between polymers and surface, the polar wires are also grown on ultrathin insulating NaCl films on metal surfaces.

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