Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 37: Nanostructures at Surfaces III
O 37.4: Talk
Tuesday, March 8, 2016, 15:00–15:15, S054
Pyridyl-functionalized triarylamines self-assembled on Au(111) — •Leonid Solianyk1, Juan Carlos Moreno-López1, Jun Li1, Stefano Gottardi1, 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
The formation of 2D molecular architectures on surfaces with both a predefined structure and desired catalytic/electronic properties is of potential interest for the usage in future nanoelectronic devices while self-assembly is a valuable tool for building these nanostructures. In our work, we investigated the self-assembly of pyridyl-functionalized triarylamines on the Au(111) surface by scanning tunneling microscopy at 77K and low energy electron diffraction. 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 atom(s). Thermal annealing at 180°C results in the exclusive formation a second hexagonal nanoporous network with a larger pore size. The structural models and the intermolecular as well as the molecule substrate interactions are discussed for the mentioned structures.