Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 68: Nanostructures at Surfaces: 1D, 2D Structures and Networks

O 68.11: Poster

Mittwoch, 9. März 2016, 18:15–20:30, Poster A

Analysis of structural and mechanical properties of long chain self-assembled monolayer on Au(111) by STM and AFM — •Torben Marx, Dirk Dietzel und André Schirmeisen — Institut für Angewandte Physik, Justus-Liebig-Universität, Gießen

Self-assembled monolayers (SAMs) are considered potential building blocks for a variety of nanotechnology applications. They are employed in e.g. the fields of material protection, electrode modification in electrochemistry, lithography as well as biology and medicine. The specific structural and mechanical properties of SAMs are the result of a spontaneous formation of organized objects out of smaller units, i.e. molecules, and are typically of crucial importance for any application. An important parameter in this context is the chain length of the molecules. Short-chain alkanethiol SAM on Au(111) are well studied and it was found that at saturation coverage the monolayer is typically of complex structure. In this work we have analyzed a long-chain alkanethiol (hexadecanethiol), which have been rarely studied up to now due to their relatively high resistance in STM. We found distinct orientated domains with the typical (√3x√3)R30^∘ structure to exist. The adsorbate was structured further into a c(4x2) superlattice, which splits up in five different phases [1]. Additionally we have used AFM to analyze the mechanical properties of SAM with respect to stability and self healing capabilities.

[1] Lüssem et. al.,Langmuir , 21, 5256-5258 (2005)