Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 3: New Methods and Developments I: Scanning Probe Techniques
O 3.3: Talk
Monday, April 1, 2019, 11:00–11:15, H5
Constant current scanning mode for imaging single molecules using low temperature atomic force microscopy with CO functionalized tips — •Daniel Martin-Jimenez1, Doreen Mollenhauer2, Hermann A. Wegner3, Andre Schirmeisen1, and Daniel Ebeling1 — 1Institute of Applied Physics (IAP), Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany — 2Institute of Physical Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany — 3Institute of Organic Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
Functionalizing the tip of a low temperature atomic force microscope (AFM) with a single CO molecule facilitates imaging of single adsorbed molecules with submolecular resolution; this is often denoted as bond imaging AFM. Therewith identification of adsorption structures, reaction pathways, etc. becomes feasible. In the standard bond imaging technique, the sensor scans the samples in constant height. While this scanning mode is, in particular, suitable for types of molecules that adsorb planar to the substrate, it is incapable of imaging 3D adsorption structures. To solve this problem, we utilize a scanning mode that achieves submolecular resolution while it tracks the topography by applying a constant current. Constant height and constant current scanning modes are systematically compared and advantages and disadvantages are presented.