Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)
O 58.8: Poster
Wednesday, March 13, 2013, 18:15–21:45, Poster B1
Epitaxial order of self-assembled monolayers with attached molecular switches on Si(111), investigated by X-ray diffraction — •Christopher Weber1, Michael Axman Petersen2, and Stefan Kowarik1 — 1Institut für Physik, Humboldt-Universität zu Berlin, 12489 Berlin — 2Institut für Chemie, Technische Universität Berlin, 10623 Berlin
Self-assembled monolayers (SAMs) can be used to chemically attach molecular switches to metal or semiconductor surfaces. The structure of the underlying linker SAM is often crucial for the switching efficiency of the system. In this case carboxyl-terminated alkyl-SAMs are used to couple molecular switches to a hexagonal Si(111) surface. The thickness, electron density and area per molecule of the SAM have been determined by X-ray reflectivity (XRR). The XRR results indicate that every second accessible Si-bond is occupied by an alkyl chain, in agreement with simulations. In addition to the out-of-plane information, the in-plane SAM structure and the epitaxial orientation of the SAM with respect to the Si(111) surface has been analyzed with grazing incidence X-ray diffraction (GIXD). We show that the alkyl-molecules form a highly stable SAM with a well-defined in-plane structure and epitaxial orientation relative to the Si(111) surface.