SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 97: Focus Session: Scanning Probe Microscopy with Quartz Sensors IV
O 97.2: Talk
Friday, March 31, 2023, 10:45–11:00, TRE Ma
Exploring in-plane interactions beside an adsorbed molecule — •Shinjae Nam1, Elisabeth Riegel1, Lukas Hörmann2, Oliver T. Hofmann2, Oliver Gretz1, Alfred J. Weymouth1, and Franz J. Giessibl1 — 1Institute of Experimental and Applied Physics, University of Regensburg, Germany — 2Institute of Solid State Physics, Graz University of Technology, Austria
In-plane interactions between two molecules on a surface can be used to guide on-surface chemical reactions. Our implementation to study in-plane interactions is Lateral Force Microscopy (LFM), where the tip of an AFM is oscillated laterally to directly measure the lateral forces. We investigate the short-range interactions by approaching the side of an adsorbate with a CO-terminated tip. By obtaining 3D data sets at the sides of PTCDA and CO, we demonstrated the large influence of the metal dipole at the tip apex. While previous work has noted this for strongly polarized materials, including defects in ionic crystals [1] and hBN [2], we showed that the metal tip dipole above CO must be also accounted for when measuring closer to single molecules.
1. M. Ellner et al., Nano Lett. 16, 1974 (2016). 2. F. Schulz et al., ACS Nano 12, 5274 (2018)