Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 12: Morphology Prediction at Interfaces

O 12.7: Vortrag

Montag, 7. März 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.