Regensburg 2004 – scientific programme

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O: Oberflächenphysik

O 4: Organische Dünnschichten I

O 4.5: Talk

Monday, March 8, 2004, 12:15–12:30, H43

Preparation of stacked alkylsiloxane bilayers by spin coating — •Rafael Bautista, Steffen Franzka, Daniel Dahlhaus, and Nils Hartmann — Universität Duisburg-Essen, Fachbereich Chemie, Universitätsstr. 5, 45141 Essen

A simple one-step procedure for the preparation of stacked alkylsiloxane bilayers is suggested. Solutions of alkyltrichlorosilanes have been spin coated onto oxidized and H-terminated silicon substrates, respectively. Subsequently, the samples are inspected by optical and atomic force microscopy. On the oxidized substrates the coating results in the formation of macroscopic cellular structures. Whereas, ordinary alkylsiloxane islands can be identified within the cells, stacked alkylsiloxane bilayers are formed close to the rim of these structures. In contrast, a macroscopically more homogeneous coating with stacked alkylsiloxane bilayers results on the H-terminated substrates. Initially, the bilayers show a remarkable flexibility. Using the tip of the atomic force microspcope, they can be easily shifted between the levels maintaining the vertical alignment of the molecular units. Only after some days, lateral cross-linking appears to set in.