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O: Fachverband Oberflächenphysik
O 47: Metal substrates: Adsorption of organic / bio molecules V
O 47.1: Vortrag
Mittwoch, 24. März 2010, 10:30–10:45, H36
Adsorption behaviour of Phthalocyanine molecules on a Au(1 1 0) surface — •Tobias Pertram1, Jan-Markus Essen1, Séverine Le Moal2, Marco Moors1, Michael Peintinger1, Conrad Becker2, Thomas Bredow1 und Klaus Wandelt1 — 1Institute of Physical and Theoretical Chemistry, Wegelerstr. 12, D-53115 Bonn, Germany — 2CINAM - CNRS - UPR 3118, Campus de Luminy - Case 913, F-13288 Marseille, France
The {1 1 0} surfaces of fcc metals contain an intrinsic anisotropy due to their rectangular surface unit cell. This anisotropy is even more pronounced in case of the (1× 2) missing row reconstruction, which is typical for the Au(1 1 0) surface. We have used this reconstructed surface as a substrate for the deposition of phthalocyanine molecules. In our STM and LEED study we found the formation of molecular double rows which are aligned with the closed packed rows of the reconstructed Au(1 1 0) surface. In addition to a coverage dependence of the length of the double rows, we found that the presence of these rows also influences the type of the reconstruction of the Au(1 1 0) surface. Whereas at uncovered regions the (1× 2) reconstruction could be observed, at regions covered with phthalocyanine double rows a (1× 3) reconstruction was found. The formation of double rows on the (1× 3) reconstructed Au(1 1 0) surface is triggered by both a strong molecule–molecule interaction and a strong molecule–substrate interaction. In contrast only a weak interaction between adjacent dimmers along the rows could be observed, the closest distance between them equals six times the Au lattice constant.