Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 12: Morphology Prediction at Interfaces
O 12.7: Talk
Monday, March 7, 2016, 16:30–16:45, S051
Long-Range Order Induced by Intrinsic Repulsion on an Insulating Substrate — Julia L. Neff1, Hagen Söngen1, •Ralf Bechstein1, Philipp Maass2, and Angelika Kühnle1 — 1Institute of Physical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55099 Mainz, Germany — 2Fachbereich Physik, Universität Osnabrück, 49076 Osnabrück, Germany
Creating complex functional structures on surfaces requires tools like molecular self-assembly. Here, adjusting the balance between intermolecular and molecule-surface interactions is a versatile strategy for tailoring molecular structure formation. Short-ranged attractive forces have often been in the focus while long-ranged repulsive interactions have been explored only rarely, despite their potential for steering molecular order formation. We report an ordered arrangement of molecular stripes with equidistant appearance that is formed upon the adsorption of 3-hydroxybenzoic acid onto calcite (10.4) at room temperature. The observed next-neighbor stripe distance distributions deviate substantially from random distributions of non-interacting stripes, verifying the existence of a repulsive interaction between the stripes. Even at low molecular coverage, where the average stripe distance is as large as 16 nm, the stripes are significantly ordered, demonstrating the long-range nature of the involved repulsive interaction. We show, it is plausible that adsorption-induced charge redistribution alone is responsible for the observed long-range repulsion. This generic repulsion mechanism is expected to play an important role in molecular self-assembly on insulators.