Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Inorganic/Organic Interfaces: Growth III
O 20.8: Vortrag
Dienstag, 17. März 2015, 12:15–12:30, MA 005
Peptides as bio-organic building blocks for self-assembly on surfaces — •Sabine Abb1, Ludger Harnau2,3, Stephan Rauschenbach1, and Klaus Kern1,4 — 1Max-Planck-Institute for Solid State Reserach, Heisenbergstr. 1, Stuttgart — 2Max-Planck-Institute for Intelligent Systems, Heisenbergstr. 3, Stuttgart — 3IV. Institute for Theoretical Physics, University Stuttgart, Pfaffenwaldring 57, Stuttgart — 4Ecole Polytechnique Fédérale de Lausanne, Switzerland
In the past decade, the self-assembly of molecules on surfaces via hydrogen bonding and metal coordination has been studied extensively with small, specifically designed organic molecules, yielding a huge variety self-assembled structures. Peptides and proteins are the building blocks of biological self-assembly employing the same bonding motifs. Electrospray ion beam deposition (ES-IBD) enables us to deposit these non-volatile molecules intact in ultra-high vacuum (UHV) where they can be investigated with high precision by STM.
Here, we report the self-assembly of angiotensin II, an 8 amino acid peptide, on metal surfaces. We deposited submonolayer coverage in vacuum by ES-IBD and subsequently investigated the assemblies by STM. While the peptide forms regular yet isolated trimer assemblies on Cu(111) surfaces, long range ordering into a chiral honeycomb network can be observed on Au(111). By a combination of high resolution STM and atomistic MD simulation, we are able to provide an atomistic model and highlight important aspects of peptides as bio-organic building blocks.