Berlin 2008 – scientific programme

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DS: Fachverband Dünne Schichten

DS 5: Organic Thin Films

DS 5.1: Talk

Monday, February 25, 2008, 17:45–18:00, H 2013

Functionalization of (0001) 6H-SiC with organic silanes — •Sebastian Schoell, Marco Hoeb, Ian Sharp, Martin Stutzmann, Martin Eickhoff, and Martin S. Brandt — Walter Schottky Institut, Technische Universität München, 85748 Garching, Germany

Due to its extraordinary physical properties and chemical stability SiC is a promising material for biosensor applications. The affinity of SiC to form OH-terminated surfaces by wet chemical treatments is exploited to generate functional layers via silanization with organic molecules on SiC. In particular, wet chemically processed layers of ODTMS and APDEMS on n-type (0001) 6H-SiC were investigated. The structural and chemical properties of these layers were studied by contact angle measurements, atomic force microscopy (AFM), thermal desorption spectroscopy (TDS), and X-ray photoelectron spectroscopy (XPS). The organic layers are smooth and change their wettablity depending on the molecules used. Desorption temperatures in the range of 550°C indicate covalent bonding of the organic molecules to the SiC surface. Starting from monolayers with amine functional groups, the possibility of attaching complex molecules was demonstrated by immobilizing proteins on micropatterned organic layers followed by direct imaging via fluorescence microscopy.