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O: Fachverband Oberflächenphysik

O 55: Organic Molecules on Inorganic Substrates IV: Adsorption and Growth II

O 55.6: Topical Talk

Wednesday, March 29, 2023, 16:15–16:45, CHE 91

Towards Understanding and Controlling On-Surface Reactions and Self-Assembly Mechanisms — •Daniel Ebeling — Institute of Applied Physics, Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany

The ability to construct organic nanomaterials with atomic precision is the key for applications in molecular electronics as the (opto-)electronic properties of such quantum materials depend on their atomic structure and size. To develop new strategies for synthesizing organic nanomaterials on surfaces, in-depth knowledge about the reaction processes and self-assembly mechanisms is needed. This can be revealed by visualizing the chemical structure and orientation of individual reaction intermediates using bond imaging atomic force microscopy (AFM).

In this presentation, recent results will be discussed that offer an approach for tuning the self-assembly process of halogenated compounds via reversing the binding selectivity of intermolecular halogen bonds. [1] A strategy for building covalent nanostructures one molecule at a time on an inert sodium chloride surface via scanning probe manipulation is also presented. This enables synthesizing elusive covalent nanoarchitectures, studying structural modifications and revealing pathways of intermolecular reactions. [2] Moreover, possibilities for tweaking the bond imaging technique using torsional and flexural higher eigenmodes of qPlus sensors will be illustrated. [3]

[1] J. Tschakert et al. Nature Communications 11, 5630 (2020)

[2] Q. Zhong et al. Nature Chemistry 13, 1133 (2021)

[3] D. Martin-Jimenez et al. Nanoscale 14, 5329 (2022)