Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 92: Nanostructures at Surfaces II
O 92.1: Talk
Thursday, March 21, 2024, 15:00–15:15, MA 042
Shape control in 2D molecular nanosheets by tuning anisotropic intermolecular interactions and assembly kinetics — •Maximilian Dreher1, Pierre Dombrowski1, Matthias Tripp2, Niels Münster2, Ulrich Koert2, and Gregor Witte1 — 1Philipps-University of Marburg, Physics Department — 2Philipps-University of Marburg, Chemistry Department
The fabrication of organic nanostructures is hardly applicable by traditional lithographic pattering techniques due to the limited stability of molecular materials. In this study, we present a methodology for achieving controlled mesoscopic shapes in 2D molecular nanosheets through kinetic controlled self-organization. Using van-der-Waals bound molecules, we demonstrate precise control over the shape of nanosheets without modification of their intrinsic molecular packing. Our study focuses on anisotropic attractive Coulomb forces between partially fluorinated pentacenes, evaluating their role in promoting the growth of distinctly elongated nanosheets. Notably, we observe anisotropic elongation between nanosheets grown directly and those fabricated through partial desorption of a complete molecular monolayer. Monte Carlo simulations reveal that lateral intermolecular interactions predominantly drive the different kinetics of nanosheet growth and desorption. By comparing the behavior of differently fluorinated molecules experimentally and computationally, we identify design rules for molecules for effective shaping of organic nanostructures.[1]
[1] M. Dreher et al., Nat Commun (2023), 14, 1554
Keywords: van-der-Waals materials; monte carlo; stm; molecular adlayers; intermolecular interactions