Dresden 2003 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 20: POSTER A
CPP 20.57: Poster
Montag, 24. März 2003, 19:00–21:00, ZEU/250
Coating of Gallium Arsenide with Funktional Biphenylthiol Monolayers — •Klaus Adlkofer1, Abraham Ulman2, Michael Grunze3, and Motomu Tanaka1 — 1Technische Universität München, Biophysik, E22 — 2Polytechnic University, Brooklyn, Dep. of Chem. Eng. — 3Universität Heidelberg, Angew. Phys. Chemie
Biocompatible, functional interlayers between semiconductors and biological materials have numerous scientific and practical applications. Although gallium arsenide (GaAs) has been claimed to realize high sensitive devices due to their high electron mobility in nano-structures, the complex electrochemical processes at the GaAs/electrolyte interface have impeded the functional modification of GaAs-based devices. To avoid surface degradation under physiological conditions and to accomplish functional surfaces, self-assembled monolayers of 4-hydroxy-4-mercaptobiphenyl and 4-methyl-4-mercaptobiphenyl were deposited onto GaAs [100] surfaces. The homogeneity of the surface coating was checked by AFM and the rms roughness of the monolayer-coated surface was found to be comparable to that of the freshly prepared GaAs surface. The chemical functionality (hydrophobicity, hydrophelicity) was checked by contact angle measurements. Electrochemical properties of the monolayers were monitored by cyclic voltammetry and impedance spectroscopy, exhibiting a significant stability in a wide potential range. Such a functional and stable surface coating is a promising platform for deposition of artificial lipid mono- and bilayers.