Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 72: Poster: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales

O 72.7: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster D

Characterization of C60 derivatives by Atomic Force Microscopy — •Paul Mosser¹, Antoine Hinaut¹, Thilo Glatzel¹, Shi-xia Liu², Silvio Decurtins², and Ernst Meyer¹ — ¹Department of Physics, University of Basel, Klingelbergstrasse 82, CH 4056 Basel, Switzerland — ²Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH 3012 Bern, Switzerland

Pristine C60 as a rigid spherical molecule is a 3D strong electron acceptor. The absorption spectrum of fullerene changes greatly as it approaches a metal surface, and a significant dependence on the distance between the molecule and the substrate is expected. For this purpose, functional groups with the binding affinity of Au substrates can be covalently attached to the fullerene core with any regioisomeric pattern and used to tune the coupling of the compounds with the local plasmons. In this work, N-pyridyl-3,4-fulleropyrrolidine (C60-Py) is studied as it is supposed to form Au-N bonds on a gold surface. C60-Py were evaporated on an Au(111) surface and characterized using nc-AFM and KPFM at room temperature and under UHV conditions. The high-resolution AFM images of C60-Py islands show a periodicity difference compared to pristine C60 islands showing that the pyridyl-pyrrolidine group has an influence on the self assembly on Au(111). KPFM measurements show a contrast in CPD between Au, the pristine C60 islands and the C60-Py islands of 200mV.

Keywords: Scanning Probe Microscopy; Atomic Force Microscopy; Kelvin Probe Force Microscopy