Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 87: Focus Session: Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation III
O 87.7: Vortrag
Donnerstag, 21. März 2024, 16:45–17:00, HE 101
Low temperature atomic force microscopy with an adaptive tunneling current feedback for simultaneously visualizing chemical structures and adsorption positions of organic molecules — Daniel Martin-Jimenez1,2,3, Qigang Zhong1,2, André Schirmeisen1,2, and •Daniel Ebeling1,2 — 1Institute of Applied Physics (IAP), Justus Liebig University Giessen, Germany — 2Center for Materials Research (LaMa), Justus Liebig University Giessen, Germany — 3Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus Bellaterra, Barcelona, Spain
Low temperature atomic force microscopy with CO-functionalized tips allows to visualize the chemical structure of adsorbed organic molecules. This tool became essential for the field of on-surface synthesis as it enables revealing the structures of the products and corresponding reaction mechanisms. Established methods for determining adsorption positions of precursors, intermediates, and products, which are important for a direct comparison with calculated adsorption structures, however, remain rather complex and time-consuming. Here, we illustrate a relatively simple method that can be used to simultaneously visualize the chemical structure of organic molecules and surface atoms in a single scan. The proposed method is based on automatically switching between different tunneling feedback parameters, which are optimized for the two different tasks. Switching between feedback parameters allowed to reliably image highly mobile 2-iodotriphenylenes on a Ag(111) surface with sub-molecular resolution and precisely determine the positions of Ag(111) top sites in their close vicinity.