Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 87: Poster Session - Nanostructures at Surfaces: 1D and 2D Structures and Networks
O 87.2: Poster
Mittwoch, 18. März 2020, 18:15–20:00, P2/1OG
Modeling of molecular stripe formation on insulating surfaces — •Christoph Schiel1, Maximilian Vogtland2, Ralf Bechstein2, Angelika Kühnle2, and Philipp Maass1 — 1Fachbereich Physik, Universität Osnabrück, Germany — 2Fakultät für Chemie, Universität Bielefeld, Germany
The interplay of intermolecular and molecule-surface interactions plays a decisive role for molecular structure formation. Insulating surfaces are interesting due to the weaker electronic coupling of the molecules to the substrate compared to metals. This allows for exploiting the rich variety of intermolecular interactions to a larger extent, in particular for pattern formation with specific applications in nanotechnology. Here we study theoretical approaches to model the stripe formation of 3-hydroxybenzoic acid (3-HBA) and 3-aminobenzoic acid (3-ABA) molecules on calcite (104). It is argued that adsorption-induced dipolar interactions cause an ordering towards a regular spacing between the molecular stripes [1]. We model the stripe formation by an anisotropic Ising model with dipole-dipole interactions. Stripe length and distance distributions are determined by Monte Carlo simulations and show good agreement with the experimental data. They allow us to give estimates for induced dipole moments and binding energies between molecules.
[1] J. L. Neff, H. Söngen, R. Bechstein, P. Maass, A. Kühnle, J. Phys. Chem. C 119, 24927 (2015).