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O: Fachverband Oberflächenphysik

O 81: Poster Focus Session: Molecular Nanostructures on Surfaces - New Concepts towards Complex Architectures

O 81.15: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Self-assembly of cyano-substituted porphyrin-derivatives on bulk insulators — •Min-Ken Li, Jia Liu, Mirunalini Devarajulu, and Sabine Maier — Department of Physics, Universität Erlangen-Nürnberg, Erlangen, Germany

The realization of molecule-based devices requires functional molecular building blocks integrated on suitable substrates. Due to the strong interaction between molecular building blocks and metal surfaces, most molecules lost their original functionality on metal surfaces. The weak interaction between organic molecular building blocks and bulk insulating surfaces makes it ideal for the fabrication of molecular devices. Hence, organic molecules adsorbed on insulating surfaces have been attracting more and more attention recently.[1] Here, we present a study on the self-assembly of cyano-substituted tetraphenylporphyrin derivatives on bulk KBr(001) and MgO(0001) by non-contact atomic force microscopy (AFM) at low temperature. We observed two-dimensional self-assembly of the cyano-substituted tetraphenylporphyrin derivatives. The interaction between intermolecular cyano and phenyl groups plays an essential role in the formation of the 2D self-assembly.[2] The structure of the self-assembly will be discussed in detail based on AFM images featuring sub-molecular resolution.
[1] P. Rahe, et al. Advanced Materials, 2013, 25-29, 3948-3956
S. Maier, et al. Small, 2008, 4, 1115-1118