Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Metal substrates: Adsorption of organic / bio molecules IV
O 27.2: Vortrag
Dienstag, 15. März 2011, 11:30–11:45, PHY C213
Adsorption of Tetrahydroxybenzene on Metal Surfaces — •Fabian Bebensee1, Christian Bombis1, Federico Masini1, Svetlana Klyatskaya2, Mario Ruben2, Erik Laegsgaard1, Flemming Besenbacher1, and Trolle R. Linderoth1 — 1iNANO, Aarhus University, Aarhus, Denmark — 2Karlsruhe Institure of Technology (KIT), Institut für Nanotechnologie, Karlsruhe, Germany
The synthesis of extended, well-ordered bi-dimensional molecular networks on surfaces has received a great deal of interest over the past years, fueled not least by potential applications such as functionalized surface coatings, sensors and molecular electronics. Here, we employ scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) to study the adsorption of tetrahydroxybenzene (THB) on the Au(111) and Cu(111) surfaces. The molecule shows a complex adsorption behavior despite being structurally rather simple. Depending on post-deposition treatment, coverage and substrate, we find different adsorption structures: a hexagonal close-packed phase and a porous network structure exhibiting a high degree of order. The XPS results reveal that the transformation from the hexagonal close-packed phase to the porous network is linked to a chemical modification of THB, possibly involving dehydrogenation of the molecules. We tentatively propose that the porous network, which was observed solely on the Cu(111) surface, is a metal complexation structure involving native Cu released during post-deposition annealing.