Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.58: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Porphine on Copper (110) - Adatoms make the difference — •Abel Robin, Matthew Stephen Dyer, Sam Haq, Mats Persson, and Rasmita Raval — University of Liverpool, Liverpool, U.K.
We have studied the adsorption of free-base (H2-P) and copper porphine (Cu-P) molecules on a Cu(110) surface.
Using scanning tunnelling microscopy (STM), reflection absorption infrared spectroscopy (RAIRS) and density functional theory (DFT) calculations we gain insight into the details driving the adsorption and organization of porphine molecules on metal surfaces. Interestingly, we find Cu-P molecules organizing upon adsorption in regular 2D assemblies whereas H2-P only exhibits local ordering - even after annealing.
Experiments and calculations reveal another major difference between the two investigated systems, that is Cu-adatoms are attracted by H2-P molecules; a process not observed for Cu-P adsorption. The adatom-attachment to H2-P has - next to a number of interesting features - an influence on the ability of the porphine molecule to self-assemble into a regular structure. Metallization experiments of H2-P do not lead to a significant improvement in molecular ordering, suggesting that the molecules do remember the original adsorption environment, therefore, the adatom attachment to H2-P induces irreversible adsorption features.
Finally, we will present experimental and theoretical details of the highly organized Cu-P assembly. This structure is promising for technological applications since it does not require complicated functional groups attached to the porphyrin molecule for self-assembly.