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O: Oberflächenphysik
O 14: Postersitzung (Adsorption an Oberflächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Phasenübergänge, Rastersondentechniken, Struktur und Dynamik reiner Oberflächen)
O 14.54: Poster
Montag, 8. März 2004, 18:00–21:00, Bereich C
A prove of the spreader-bar approach: Fabrication and characterization of heterogeneous monomolecular films — •Andrey Shaporenko1, Thomas Hirsch2, Vladimir Mirsky2, and Michael Zharnikov1 — 1Angewandte Physikalische Chemie, Universität Heidelberg, 69120 Heidelberg — 2Institut für Analytische Chemie, Chemo- und Biosensorik, Universität Regensburg, 93040 Regensburg
The aim of the work is a development of a new technology for simple formation of nanostructures with controlled shape and distribution in monomolecular films. The technology is based on combination of a self-assembly of thiol compounds on metals and an approach of molecular spreader-bars. Through such a combination, mixed monomolecular films with a defined size of structural elements can be formed and subsequently used as a platform for biological and chemical research and sensor fabrication. At an initial stage of the project, several combinations of relevant molecular constituents have been tested, including simple aliphatic and aromatic thiols and large conjugated molecules with and without specific anchor groups. The resulting monomolecular films have been characterized by several complementary experimental techniques, such as X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy, X-ray absorption spectromicroscopy, and infrared reflection absorption spectroscopy. Conclusions on the chemical composition, orientation, and lateral distribution of the molecular constituents were driven. Based on these conclusions, both the film fabrication procedure and the selection of the molecular building blocks have been optimized.