SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Poster Session VI: Organic molecules on inorganic substrates: electronic, optical and other properties II
O 75.6: Poster
Mittwoch, 3. März 2021, 13:30–15:30, P
Force Spectroscopy of Iron Tetraphenylporphyrin Molecules with Cl Tips — Katharina Scheil1, •Manuel Gruber1,2, Martin Ondrácek3, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — 2Faculty of Physics, University of Duisburg-Essen, D-47057 Duisburg, Germany — 3Institute of Physics, Academy of Sciences of the Czech Republic, 182 21 Prague, Czech Republic
Cl ions are bidirectionally transferred between Fe tetraphenylporhyrin (FeTPP) molecules adsorbed on Au(111) and the tip of a low-temperature scanning probe microscope. This controlled transfer is used to switch between metal- and Cl-terminated tips. Both tips are employed to probe the forces and conductances upon contacting the Au(111) substrate, FeTPP and chlorinated FeTPP. The force spectroscopy of a Cl tip on Au(111) may be modeled by a point charge of −0.3 e at the Cl ion interacting with its image charge in the substrate. Such Cl tips, beside modifying electrostatic interactions and thereby the force spectra acquired over molecules, turned out useful for high-resolution imaging at small molecule-sample distances [1]. Density function theory calculations reproduce important aspects of the experimental data. [1] Scheil et al., J. Phys. Chem. C 124, 26889 (2020)
Financial support by the Deutsche Forschungsgemeinschaft through SFB 677 is acknowledged.