Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 86: Nanostructure at Surfaces: Molecular Assembly
O 86.4: Vortrag
Donnerstag, 19. März 2015, 16:00–16:15, HE 101
Surface mediated synthesis of metal-organic architectures based on thiolate-gold coordination bonds — •Atena Rastgoo Lahrood1,2, Matthias Lischka1,2, Johanna Eichhorn1,2, Thomas Strunskus4, Wolfgang M. Heckl1,2,3, and Markus Lackinger1,2,3 — 1Department of Physics, Technische Universität München, Germany — 2Center for NanoScience (CeNS), Munich, Germany — 3Deutsches Museum, Munich, Germany — 4Institute for Materials Science - Multicomponent Materials, CAU, Kiel, Germany
In our previous work we studied self-assembly of 1,3,5-tris(4-mercaptophenyl)benzene on Cu(111) and Ag(111). Upon room temperature deposition, densely packed structures were found that could subsequently be converted into more complex and open structures by mild annealing. On Cu(111) two different metal coordinated structures could be identified. To shine more light on the substrate influence further studies were carried out on Au(111). Contrary to copper and silver surfaces the initial densely packed structure was never observed. In contrast, already after room temperature deposition we observed a variety of less well-ordered structures that could be identified as metal-coordinated based on bond geometry and XPS data. Post annealing of the surface in successive steps led to the emergence of better ordered likewise metal-organic aggregates and networks with a dominance of distinct motifs at specific temperatures. Even higher annealing temperatures eventually result in sulphur cleavage and disordered molecular structures. All the samples were prepaid and analyzed (STM, XPS and NEXAFS) in an UHV chamber.