Hamburg 2001 – wissenschaftliches Programm
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O: Oberflächenphysik
O 25: Postersitzung (Grenzfl
äche fest-flüssig, Methodisches, Nanostrukturen, Organische Dünnschichten, Rastersondentechniken, reine Oberfl
ächen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie, Sonstiges)
O 25.26: Poster
Mittwoch, 28. März 2001, 15:00–18:00, Foyer zu B
Odd-even effects in biphenyl-substituted alkanethiol self-assembled monolayers — •Karin Heister1, Lars Johansson2, Hai-Tao Rong1, Manfred Buck1, Michael Zharnikov1, and Michael Grunze1 — 1Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany — 2Department of Physics, Karlstad University, S-65188 Karlstad, Sweden
Synchrotron-based high resolution X-ray photoelectron spectroscopy was applied to monitor odd-even effects in self-assembled monolayers (SAMs) of biphenyl-substituted alkanethiols CH3(C6H4)2(CH2)nSH (BPn, n = 1-4) on Au and Ag. These effects are generally related to periodical, odd-even changes in the packing density and the tilt angle of the biphenyl moieties, which occur at varying number of methylene groups in the aliphatic part in the BPn molecules. A variety of such effects at the S-substrate interface and inside the BPn films was found and considered in detail. Their occurrence and mutual correlation suggests that a BPn SAM represents a strongly correlated, highly ordered molecular ensemble. Analysis of the experimental data provides new information concerning the basic properties of both aromatic and aliphatic thiol-derived SAMs.