Regensburg 2004 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 16: POSTER: Computational Physics, Complex Systems
CPP 16.16: Poster
Dienstag, 9. März 2004, 17:00–19:00, B
The self-assembly of alkyl-trichlorosilanes on model surfaces of biphenylthiols — •Svetlana Stoycheva1, Michael Himmelhaus1, Abraham Ulman2, and Michael Grunze1 — 1Lehrstuhl f"ur Angewandte Physikalische Chemie, Universit"at Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg — 2Dept. of Chem. Eng., Chem., and Mat. Sci., Polytechnic University, Brooklyn, New York 11201, USA
Despite of its technological relevance, the self-assembly of monolayers of alkyl-trichlorosilanes onto oxidized semiconductor surfaces is still not fully understood. Phenomena, such as island formation and polymerization, hamper the formation of a densely packed and well-oriented monolayer in many cases. In particular, it has been found that the amount of surface- adsorbed water plays a crucial role for the process of film formation.
In our study we aim at elucidating the process of film formation of alkyl-trichlorosilanes by adsorbing the molecules from solution onto model surfaces with a well-defined density of anchor sites. Thereby, we utilize mixed self-assembled films of hydroxyl- and methyl-terminated biphenylthiols on gold. By variation of the mixing ratio, surfaces with controlled surface hydrophilicity and different number of anchor sites can be fabricated.
The model surfaces as well as the bilayer assemblies are characterized by contact angle measurements, spectral ellipsometry, infrared reflection absorption spectroscopy, and X-ray photoelectron spectroscopy.