Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Poster: Nanostructures on Surfaces I
O 49.9: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
2D self-assembly of TPT on noble metal surfaces — •Sebastian Becker1,2, Lu Lyu1, Sina Mousavion1, Maniraj Mahalingam1, Markus Gerhards2, Benjamin Stadtmüller1,3, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern — 2Department of Chemistry, University of Kaiserslautern, Erwin-Schrödinger-Str. 52, 67663 Kaiserslautern — 3Graduate School Materials Science in Mainz, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern
Interfacial properties of organic films on noble metal surfaces are determined by a delicate balance between different interactions at the interface. Here, we investigate the geometric and electronic structures of TPT (2,4,6-triphenyl-1,3,5-triazine) on three (111) different noble metal surfaces with different surface reactivity using LT-STM and LEED. On Cu(111), TPT forms a long range ordered honeycomb-like metal-organic network with Cu adatoms in which the nitrogen atoms of the triazine ring adsorb on top of the Cu atoms[1]. In contrast, a close packed herringbone structure is observed for TPT on the less reactive Ag(111) and Au(111) surfaces at RT. Most interestingly, for TPT/Ag(111), we find a temperature-driven structural phase transition from the herringbone structure at RT to a honeycomb-like cavity structure at LT which was not observed for the other surfaces. Our findings will be correlated to the surface reactivity and the corresponding molecule-substrate interaction of each adsorbate system. [1] PRB 95, 094409 (2017)