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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Organic Molecules on Inorganic Substrates IV: Electronic Properties, Excitations, Dynamics

O 60.9: Vortrag

Mittwoch, 3. April 2019, 17:00–17:15, H24

Tuning the adsorption geometry of cyano-substituted porphyrins on bulk insulators — •Min-Ken Li, Mirunalini Devarajulu, Jia Liu, Maximilian Ammon, and Sabine Maier — Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

The realization of molecular-based devices requires the adsorption of molecular building blocks on insulating substrates to preserve their original functionality. Therefore, organic molecules on insulating surfaces have been attracting more attention recently. Porphyrins are of particular interest because they are robust, and their adsorption and electronic properties can be changed by chelation of a metal ion or substitution of anchor groups on the macrocycle; both tune the interplay between intermolecular and molecule-surface interactions.[1] Here, we report on the adsorption geometry and self-assembly of cyano-substituted porphyrin derivatives on bulk KBr(001), MgO(001), and Au(111) surfaces using non-contact atomic force microscopy and scanning tunneling microscopy featuring sub-molecular resolution at low temperature. We demonstrate that the adsorption geometry of mono-cyano-substituted porphyrin derivatives can be tuned by functional side groups from nearly up-right standing to flat lying.[2] Moreover, we will discuss the influence of the central metal ion, the number of cyano-groups as well as the substrate on the adsorption geometry and the structure formation of self-assemblies.

[1] J.M.Gottfried, Surf. Sci. Rep., 2015, 70, 3, 259-379

[2] S. Maier, et al. Small, 2008, 4, 1115-1118

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