Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 5: Organic Molecules at Surfaces 1: Substrate Effects
O 5.8: Vortrag
Montag, 5. September 2022, 12:30–12:45, S051
The Number of KCl layers counts:
Thickness dependent Growth of Quinacridone on KCl on the Ag(100) surface — •Niklas Humberg1, Rémi Bretel2, and Moritz Sokolowski1 — 1Institut für Physikalische und Theoretische Chemie der Universität Bonn, Germany — 2University of Paris-Saclay, Institut des Sciences Moléculaires D’Orsay, France
The epitaxial growth of the prochiral molecule quinacridone (QA) on a insulating KCl layer on the Ag(100) surface was investigated by STM. If QA is deposited onto a complete KCl layer, then the growth of QA structures is strongly dependent on the thickness of the KCl layer. For small amounts of QA on thin KCl layers small domains of parallel molecular chains were observed. The structure of these chains is identical to the chains that were previously observed on the Ag(100) surface. However, the repulsive substrate mediated interaction between neighboring chains that was observed on the Ag(100) surface cannot be observed on such KCl layers. Interestingly, depositing larger amounts of QA on such KCl layers leads to the formation of three-dimensional chain-like structures that show some similarities with the bulk crystal structures of QA.
Contrary to this, on thick KCl layers on the Ag(100) surface that are five or more monolayers high dewetting of the molecules and a formation of three-dimensional QA clusters was already observed for very small amounts of QA. These effects are explained by the interaction between the QA molecules and the silver substrate which still plays a role for thin layers but is suppressed by thick KCl layers.