Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.31: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

Stability and Structure of Benzenethiol, Pentafluorobenzenethiol and mixed SAMs on Pd(111) prepared by immersion — •Heiko Heim, Christian Schmidt, and Gregor Witte — AG Molekulare Festkörperphysik, Philipps-Universität Marburg, D-35032 Marburg

Self assembled monolayers of (partly) fluorinated aromatic organothiols have been successfully employed to modify metal-organic interfaces such as gold electrodes in order to improve the properties of organic electronic devices [1,2]. Recent studies have further shown that apart from gold also palladium constitutes a promising electrode material for such devices [3,4]. However, compared to the case of gold the thiol/palladium interface is by far less extensive investigated. In this study we have characterized the structure and thermal stability of benzenethiol- (BT) and pentafluorobenzenethiol-SAMs (PFBT) on Pd(111) by means of XPS, NEXAFS and TDS. Moreover, since perfluorination causes an inversion of the quadrupole moment of the phenyl rings which may lead to an additional stabilization between fluorinated and non-fluorinated molecules also SAMs of different stoichiometric mixtures of BT and PFBT have been studied.

[1] D.J. Gundlach et al., Nature Materials, 7, 216 (2008)

[2] N. V. Venkataraman et al., J. Phys. Chem., 113, 5620 (2009)

[3] J. Love et al., J. A. Chem. Soc., 105, 1171 (2005)

[4] C. Bock et al., Physica E, 40, 2107 (2008)