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    Self-assembly of phosphorylated dihydroceramide at Au(111) electrode surface

    Year: 2017

    Journal: Mater. Chem. Phys., Volume 186, JAN 15, page 212–219

    Authors: Pawlowski, Jan; Juhaniewicz, Joanna; Sek, Slawomir

    Organizations: Polish National Science Centre [2012/05/B/ST4/01243]; European Union from the European Regional Development Fund under the Operational Program Innovative Economy

    Keywords: Lipids; Adsorption; Gold electrode; Atomic force microscopy; Scanning tunneling microscopy

    Although the adsorption of lipids on reconstructed Au(111) surface and formation of highly ordered stripe-like domains are well-known phenomena, the exact orientation of the molecules with respect to the substrate remains unclear. Therefore, in this study we have focused on the structure and arrangement of lipid molecules forming highly ordered stripe-like domains at gold electrode-electrolyte interface. N-palmitoyl-D-erythro-dihydroceramide-1-phosphate was selected as model compound since its ability to transform into hemimicellar structure is limited. This way it was possible to get very stable lipid film with characteristic stripe-like pattern. Application of complementary techniques such as atomic force microscopy and scanning tunneling microscopy enabled detailed characteristics of lipid adlayer adsorbed on Au(111) electrode. Based on careful analysis of the experimental results, we have proposed a model which describes the arrangement of the molecules within the film. In general, it assumes flat-lying orientation of the lipids but only one hydrocarbon chain of phosphorylated dihydroceramide is involved in direct interaction with gold. (C) 2016 Elsevier B.V. All rights reserved.
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