Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 22: POSTER C

CPP 22.36: Poster

Donnerstag, 27. März 2003, 12:00–14:00, ZEU/250

Responsive Nanopatterned Polymer Surfaces — •Nicolaus Rehse¹, Ulrike Mock², Svetlana Prokhorova², Jürgen Rühe², and Georg Krausch¹ — ¹Physikalische Chemie II, Universität Bayreuth, 95440 Bayreuth — ²Institut für Mikrosystemtechnik, Universität Freiburg, 79110 Freiburg

We present a route to prepare switchable surfaces which combine chemical patterns on the mesoscopic length scale (∼ 200 nm) with covering of large surface areas (∼ 1cm²). By controlled heating of miscut Si(113) surfaces under UHV conditions we obtain facetted surfaces with typical mean groove distances of 100-300 nm. By evaporating gold on one side of the facets we get a striped, chemically patterned surface. Grafting-from polymerisation with silane modified initiators leads to polymer brushes covalently bound only onto the silicon stripes. These polymer brushes can now be manipulated by an external stimulus like variation of solvent quality or temperature. A swollen polymer brush should cover the gold stripes forming a homogeneous surface while a collapsed brush will lead to a chemically striped pattern exposing the gold stripes. These gold stripes can be covered with a large variety of functions utilizing well-established sulfur chemistry. These surfaces are characterized by SFM, REM and XPS.