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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.104: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Inversion of micro-patterned polymer surfaces based on bicomponent polyelectrolyte layers — •Alla Synytska1, Manfred Stamm1, Stefan Diez2, and Leonid Ionov2 — 1Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Hohe Strasse 6, Germany — 2Max-Planck-Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany
Micropatterned surfaces are of considerable importance for microelectronics, printing technology, microfluidic and microanalitical devices, information storage, biosensors, etc. However, once a pattern is generated it cannot be easily changed on the fly. Therefore, it is desirable to develop methods for fabrication of structured surfaces with switchable and rewritable patterns.
In the present study, we report on the fabrication of micropatterned surfaces which allow the switching of topography, wettability, and charge in an inverse manner. The concept of these stimuli-responsive surfaces, which are made by a combination of photolithography, lift-off and grafting to techniques, is based on the site-selective grafting of two oppositely charged polyelectrolytes. Depending on the pH of the surrounding one kind of the polymer chains is swollen (charged and hydrophilic) while the other is collapsed (uncharged and hydrophobic). The main advantage of such surfaces is their capability of inverse switching, for example hydrophilic patterns can be reversibly converted into hydrophobic ones and vice versa, via external stimuli.