Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 111: Nanostructures at Surfaces: Molecular Systems III
O 111.2: Vortrag
Freitag, 24. März 2017, 10:45–11:00, REC/PHY C213
Pyridyl-functionalized triarylamines self-assembled on Au(111) — •Leonid Solianyk1, Juan Carlos Moreno-López1, Jun Li1, Stefano Gottardi1, Mihaela Enache1, Ute Meinhardt2, Milan Kivala2, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, The Netherlands — 2Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Germany
Engineering of molecular nanostructures on well-defined inorganic surfaces is essential for the development of nanoelectronic devices. In order to build up the nanostructures with atomic precision, ultimate control over the underlying interactions is needed. In our work, we investigated the self-assembly of pyridyl-functionalized triarylamines on Au(111) by scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED). For deposition of submonolayer coverage onto Au(111) held at room temperature, a close-packed phase as well as a hexagonal nanoporous network were observed to co-exist. The close-packed phase is stabilized by hydrogen bonding while the nanoporous network is held together by metal-ligand interactions with native gold atoms. Thermal annealing at 180°C results in the exclusive formation of a second Au-coordinated hexagonal nanoporous network with a larger pore size. Based on STM and LEED data the structural models and the intermolecular as well as molecule-substrate interactions will be discussed. Moreover, XPS data add information about the chemical state of the structures and corroborate the findings.