Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 54: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures III
O 54.6: Vortrag
Mittwoch, 14. März 2018, 12:00–12:15, MA 004
Tuning the self-assembly of carboxyl-substituted triphenylamine-derivatives on bulk NaCl(001) and KBr(001) — •Mirunalini Devarajulu1, Jia Liu1, Min Ken Li1, Christian Steiner1, Bettina Gliemann2, Yi Liu1, Tuan Anh Pham1, Milan Kivala2, and Sabine Maier1 — 1Department of Physics, University of Erlangen-Nürnberg, Erlangen, Germany — 2Department of Chemistry and Pharmacy, FAU Erlangen-Nürnberg, Erlangen, Germany
While most molecular self-assemblies so far have been studied on metallic substrates, comparatively little is known about molecular self-assemblies on insulating surfaces. One reason is the weak and often unspecific molecule-substrate interaction on bulk insulating surfaces. Therefore, the structure of the self-assemblies is challenging to predict. Here, we present a study on the self-assembly of a carboxyl-substituted dimethylmethylene-bridged triphenylamine derivative [1] on bulk NaCl(001) and KBr(001) by non-contact AFM at low temperature.
The intermolecular hydrogen bonding contributes to the formation of 2D monolayers on NaCl(001) and KBr(001). We observed structurally different self-assemblies of the carboxyl-substituted triphenylamine derivative on NaCl(001) and KBr(001), respectively, due to a significant change in lattice mismatch [2]. The surface templating effect and binding motifs will be discussed in detail.
[1] C. Steiner et al. J. Phys. Chem. C, 2015, 119 (46), 25945-25955
[2] S. Maier et al. Phys. Rev. B, 2007, 75, 195408