Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 70: Nanostructures at Surfaces: Other Aspects

O 70.5: Poster

Mittwoch, 9. März 2016, 18:15–20:30, Poster A

Different tip functionalizations in scanning probe microscopy — •Philipp Scheuerer und Jascha Repp — Universität Regensburg, Fakultät für Physik, Universitätsstraße 31, 93053 Regensburg

Recently AFM measurements with CO functionalized tips gained a lot of interest since such tips allow to resolve the chemical structure of individual molecules adsorbed on surfaces. The origin of this enhanced resolution is Pauli repulsion [1]. Moreover, it was found that the CO can bend sideways due to tip-sample forces which gives rise to additional contrast sharpening [2].

However, this bending can be a drawback as it causes image distortions. CO functionalized tips have been widely applied not only in AFM but also for KPFS measurements. Up to now, only some other small molecules and atoms were tried to functionalize the tip apex. However there is no alternative that reduces drawbacks like bending and gives a resolution comparable to CO functionalized tips.

We functionalized the tip with several different types of individual molecules to find out whether some of them provide interesting imaging properties.

[1] L. Gross, F. Mohn, P. Moll, N.and Liljeroth, and G. Meyer. Science, 325, 1110 (2009).

[2] P. Hapala, G. Kichin, C. Wagner, F. S. Tautz, R. Temirov, and P. Jelínek. Physical Review B, 90, 085421 (2014).