Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 47: Poster Tuesday: Scanning Probe Techniques

O 47.8: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Atomic Manipulation in NC-AFM Experiments: The Influence of the Chemical Tip Termination — •Damla Yesilpinar, Alexander Timmer, Bertram Schulze Lammers, Harald Fuchs, and Harry Mönig — Physikalisches Institut, WestfälischeWilhelms-Universität Münster

Controlled manipulation of atoms and molecules on the surface by an NC-AFM tip allows measuring the forces during the manipulation. The underlying mechanism has previously been attributed to lowering of the diffusion barrier due to the interaction between the tip and the manipulated particle. In this study, we have examined the effect of different chemical tip terminations on the manipulation processes. As a model system, we have chosen Xe atoms on a partially oxidized Cu(110) surface. This surface exhibits the typical p(2x1)O-reconstructed oxide stripes alternating with pure Cu domains. STM images showed that Xe atoms were preferentially adsorbed at the metal/metal-oxide boundaries. The manipulation experiments were carried out along and perpendicular to the oxide rows with metallic-, Xe-terminated and CuOx-functionalized [1] tips. While each tip was able to manipulate the Xe atoms along the oxide row, only CuOx tips allowed successful manipulations above the pure Cu domains. This work sheds light on the pronounced influence of the chemical tip termination in such experiments and provides insights on the mechanisms of the preferential adsorption at the metal/metal-oxide boundaries [2]. [1]ACS Nano 2016, 10, 1, 1201-1209 [2]Nano Lett. 2018, 18, 7, 4123-4129

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