Regensburg 2004 – scientific programme
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O: Oberflächenphysik
O 33: Organische Dünnschichten II
O 33.2: Talk
Thursday, March 11, 2004, 11:30–11:45, H39
Self-assembled monolayers of terphenyl-substituted alkanethiolates on Au(111) and Ag(111) — •Andrey Shaporenko1, Markus Brunnbauer2, Andreas Terfort2, Lars Johansson3, and Michael Zharnikov1 — 1Angewandte Physikalische Chemie, Universität Heidelberg, 69120 Heidelberg — 2Anorganische und Angewandte Chemie, Universität Hamburg, 20146 Hamburg — 3Department of Physics, Karlstad University, S-65188 Karlstad, Sweden
The packing density and exact arrangement of the molecular constituents in monomolecular films result from the interplay of the headgroup-substrate and intermolecular interactions. To get an insight into the respective phenomena, we have studied self-assembled monolayers (SAMs) formed from terphenyl-substituted alkanethiols with varying length of the alkyl part on (111) Au and Ag substrates. We used several complementary experimental techniques such as X-ray photoelectron spectroscopy (XPS), high-resolution XPS, near edge X-ray absorption fine structure spectroscopy, infrared reflection absorption spectroscopy, ellipsometry, and water contact angle measurements to characterize the SAMs. Odd-even changes in the packing density and orientation of the terphenyl moieties, etc have been observed and considered in detail. The results imply a predominant role of the headgroup-substrate interaction in the balance of structure-building forces in the aliphatic SAMs.