Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Nanostructures at surfaces: Dots, particles, clusters, arrays I
O 15.3: Vortrag
Montag, 14. März 2011, 15:30–15:45, WIL C107
Comparing different molecular building blocks designed for covalent linking on noble metal surfaces — •Matthias Koch1, Marie Gille2, Stefan Hecht2, and Leonhard Grill1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Deutschland — 2Humboldt-Universität zu Berlin, Berlin, Deutschland
The self-organized formation of molecular nanostructures on surfaces is of high interest for potential applications in future nanotechnology. A key challenge in this field is the controlled variation of the intermolecular interaction with a particular focus on strong chemical bonds, which would ensure for high stability of the nanostructures. Moreover, it should allow the formation of extended conjugated electronic systems that are of interest for efficient charge transfer. The on-surface synthesis method [1] is very promising in this regard as it fulfills both requirements and allows to covalently bind individual molecular building blocks on a surface. It is realized by activating specific side groups, i.e. thermal dissociation of halogen substitutents. In this study, we have systemically compared the self-organization of various similar molecular building blocks on different noble metal surfaces by low temperature scanning tunneling microscopy (STM). The adsorption geometry and covalent connection of the poly-aromatic molecules turns out to depend strongly on the chemical structure of the molecules and their interaction with the metal surface. Moreover, the interaction of the molecules with the metallic surface was modified by tert-butyl-legs that lift the molecular core from the surface and compared with the same molecule without such groups. [1] L. Grill et al., Nature Nanotech., 2 687 (2007)