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O: Fachverband Oberflächenphysik

O 88: Molecular Films

O 88.6: Vortrag

Freitag, 15. März 2013, 11:45–12:00, H38

Thermal Influence on the Structure of Alkylsiloxane Monolayers examined by SFG-Spectroscopy — •Jan Weber, Thorsten Balgar, and Eckart Hasselbrink — Fakultät für Chemie, Universität Duisburg-Essen, D-45117 Essen, Germany

As organic monolayers have very diverse characteristics they offer an interesting field of surface science. Especially alkylsiloxane monolayers are of interest because of their potential for modifying surfaces. Promising applications include wetting, fine-scale lithography or protection of metals against corrosion.

Alkylsiloxanes are known to form self-assembled monolayers (SAMs) that are stable under ambient conditions. Since many applications require compatibility with heating it is our goal to get a better understanding of alkylsiloxane SAMs on a molecular level at elevated temperature.

In this study we apply vibrational sum-frequency generation (SFG) spectroscopy to an octadecylsiloxane (ODS) monolayer on a glass substrate using a picosecond laser system. This method is particularly suitable because its selective surface sensitivity. Our results are discussed with respect to temperature dependent chain disorder and orientation on the surface.