Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 63: Posters: Scanning Probe Methods

O 63.24: Poster

Mittwoch, 2. April 2014, 17:30–21:00, P2

Kelvin Probe Force Microscopy on the submolecular scale — •Florian Albrecht¹, Martin Fleischmann², Manfred Scheer², and Jascha Repp¹ — ¹Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany — ²Institute of Inorganic Chemistry, University of Regensburg, 93053 Regensburg, Germany

Kelvin Probe Force Microscopy (KPFM) has been shown to be a powerful tool to detect the distribution of charges within a single molecule [1].

We performed KPFM measurements on two derivates of cyclic trimeric ortho-phenylene mercury (TPM) molecules in a low temperatures combined scanning tunneling and atomic force microscope with functionalized tips.

Whereas one of the derivates has hydrogen atoms bonded to the phenyl rings the other molecule is perfluorinated. For the latter the KPFM signal shows clear signatures of the polar fluorine carbon bonds. In addition, the fluorine influences the electron density also at the center of the molecule. The charge redistribution within the molecule was made responsible for the weak attraction of electron rich ligands at its center [2]. This charge redistribution is visualized in KPFM maps.

[1] F. Mohn, L. Gross, N. Moll, and G. Meyer, Nature Nanotechnology, 7, 227, (2012)

[2] M. R. Haneline, and F. P. Gabbai, Inorg. Chem., 44, 6248, (2005)