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O: Fachverband Oberflächenphysik
O 37: Nanostructures at Surfaces III
O 37.7: Talk
Tuesday, March 8, 2016, 15:45–16:00, S054
Disaccharide self-assembly on metal surfaces — •Sabine Abb1, Ludger Harnau1, Christian Schön1, Juan Cortés2, Stephan Rauschenbach1, and Klaus Kern1,3 — 1Max Planck Institute for solid state research, Stuttgart, Germany — 2Centre national de la rechereche scientifique, LAAS, Toulouse France — 3Ecole Polytechnique Fédérale de Lausanne, Switzerland
Saccharides are involved in almost every biological process, including signal transducing, cell-adhesion and differentiation. However, the interactions of saccharides adsorbed on a surface are not well understood on a molecular level. While the physical properties differ, the chemical structure of the monosaccharide building blocks is very similar - they all are structural and stereo isomers of the chemical sum formula C6H12O6. Their vastly different behavior follows from rather subtle differences in the placement of OH-groups in the molecules.
In this study we investigate the self-assembly of the disaccharides sucrose and trehalose on Cu(100) by STM. Electrospray ion beam deposition (ES-IBD) enables us to deposit these non-volatile molecules on the surface in ultra-high vacuum as negatively charged molecular ions. After deposition of a submonolayer coverage, we observe self-assembly of ordered 2D nanostructures as well as single molecules.
Based on our observations combined with molecular dynamics and energy landscape calculations, we can propose a model for the different disaccharide assemblies elucidating the influence of the isomers on the assembly behavior. Moreover, imaging of saccharides may be applicable to characterize branched polysaccharides.