SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Poster Session II: Nanostructures at surfaces II
O 26.8: Poster
Montag, 1. März 2021, 13:30–15:30, P
Comparing the Nanomechanics and the Chemical Properties of NC-AFM Tips — •Damla Yesilpinar1,2, Bertram Schulze Lammers1,2, Alexander Timmer2, Zhixin Hu3, Wei Ji4, Saeed Amirjalayer1,2,5, Harald Fuchs1,2, and Harry Mönig1,2 — 1Physikalisches Institut, Westfalische Wilhelms-Universitat, Muenster, Germany. — 2Center for Nanotechnology, Muenster, Germany. — 3Center for Quantum Joint Studies and Department of Physics, Tianjin University, Tianjin, China — 4Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices, Renmin University of China, Beijing, China — 5Center for Multiscale Theory and Computation, Muenster, Germany
Controlling the identity of the tip-terminating species in AFM constitutes a milestone for investigations of surfaces and adsorbates. Highlighting the importance of the mechanical tip properties, we consolidate the interpretation of such studies by comparing the performance of four atomically defined tips, namely Cu-, Xe-, CO-, and CuOx-tips. Using a nano-structured copper oxide surface, we investigated their imaging performances and capabilities in force mapping during the lateral manipulation of single adsorbed atoms. Cu-tips easily reacts with surface oxygen or the adsorbate, while chemically inert Xe- and CO-tips allow entering the repulsive force regime enabling increased resolution. But their high flexibility leads to tip-deflection and related artefacts. The combination of chemical passivation and mechanical rigidity for the CuOx-tip turns out decisive for chemical-specific imaging and for a superior performance in manipulation experiments.