SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 42: Poster: Nanostructures at Surfaces
O 42.5: Poster
Tuesday, March 28, 2023, 18:00–20:00, P2/EG
Local work function on Graphene Nanoribbons on Au(111) — •Daniel Rothhardt1, Tilmann Klamroth2, Amina Kimouche1, and Regina Hoffmann-Vogel1 — 1Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany — 2Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany
Graphene nanoribbons (GNRs) exhibit remarkable electronic properties due to the nature of the charge carriers and local confinements [1]. The local work function difference (LCDP) was investigated using an ultra-high-vacuum non-contact mode AFM and in addition to the topography, the local differences in the contact potential were recorded using the method of Kelvin Probe Force Microscopy. A charge transfer between the GNRs and the underlying gold substrate can be detected in the LCPD images which verifies the p-doping of the GNRS [2]. We observed a modification of the work function along the edges of the GNRs, which is due to the screening of the Au(111) of electrostatic fields from the GNR. Density functional theory (DFT) calculation supports the experimental findings.
[1] A.H. Castro, Neto et al , Rev. Mod. Phys. 81 , 109 (2009)
[2] D. Rothhardt et al , arXiv:2203.06945v1 , (2022)