Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Poster Wednesday: Organic Molecules at Surfaces 2

O 55.6: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P4

Systematically mapping the distance-dependent tip-sample interaction for the PTCDA/Ag(111) system — •Tim Dierker and Philipp Rahe — Fachbereich Physik, Universität Osnabrück, Barbarastraße 7, 49076 Osnabrück, Germany

Scanning probe microscopy (SPM) has been continually improved by establishing a number of controlled tip functionalizations [1]. In particular, the attachment of a single 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) molecule to the apex of a metallic tip enables mapping of the electrostatic potential near sample surfaces by so called scanning quantum dot microscopy [2,3]. In order to reliably apply this technique, the expedient pick-up of a single molecule is required [4]. Here, the tip-molecule interaction between a metallic tip and surface-adsorbed molecules is investigated by means of systematic scanning tunneling (STM) and atomic force (AFM) microscopy measurements. In particular the vertical dependencies of the STM tunneling current and the AFM frequency shift are mapped along different axes of single PTCDA molecules embedded in the molecular film on Ag(111). Fingerprints for the dynamic behavior of the molecules are clearly revealed and guide the vertical manipulation for molecular pick-up.

[1] L. Gross, Nat. Chem. 3, 273 (2011)

[2] C. Wagner et. al., PRL 115, 026101 (2015)

[3] M. F. B. Green et. al., JJAP 55, 08NA04 (2016)

[4] M. F. B. Green et. al., Beilstein J. Nanotech. 5, 1926 (2014)