Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 52: Poster Wednesday: Adsorption and Catalysis 2
O 52.5: Poster
Wednesday, September 7, 2022, 18:00–20:00, P4
Force-induced single-molecular switch of graphene-nanoribbon-fused helicene by atomic force microscopy — •Akitoshi Shiotari1,2, Ayumu Ishii1, and Yoshiaki Sugimoto1 — 1The University of Tokyo, Kashiwa, Japan — 2Fritz-Haber Institute of the Max-Planck Society, Berlin, Germany
On-surface synthesis is an effective bottom-up method to fabricate nanocarbon materials, such as graphene nanoribbons (GNRs), in an atomically precise manner. In this study, using the on-surface method with multiple precursors, we successfully synthesized new helicene-derivative molecule fused by seven-atom-wide armchair GNRs on an Au(111) surface. Atomic resolution imaging with non-contact atomic force microscopy (AFM) identified the molecular structure and the helicity (i.e., chirality of the twisted terminal of the GNR). Although the helicities of individual GNRs on the surface remained stable during observation, the approach of the AFM tip to the helicene-type terminal caused repulsive interactions, leading to the inversion of the twisted structure in a selective and reversible manner. This finding would contribute to the advanced design of switchable molecules and control of chiral-molecule-based devices and machines.