Berlin 2005 – wissenschaftliches Programm
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AKB: Biologische Physik
AKB 200: Poster Session II
AKB 200.63: Poster
Dienstag, 8. März 2005, 17:00–19:00, Poster TU C
Design of Novel GaAs/Peptide Hybrids Using Molecular Dipole Engineering — •Klaus Adlkofer1, Tomoyuki Morita2, Daniel Gassull1, Shunsaku Kimura2, and Motomu Tanaka1 — 1Lehrstuhl für Biophysik E22, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany — 2Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Japan
Combination of low-dimensional semiconductors and bio/organic molecular constructs includes a large potential towards the design of new functional material. The primary aim of this study exists in design of novel hybrid materials by combination of GaAs semiconductors and functional peptide helices with a large macromolecular dipole. The quality of the optimized monolayers was examined by measuring the film thickness with ellipsometry. When LipoL16B was grafted on GaAs, the film showed a lot of defects, which can be attributed to the weaker reactivity of disulfide coupling group. However, grafting of the peptides with thiol coupling groups (AcSL8B and AcSL16B) resulted in film thickness which agrees very well with the length of the peptide helices. Topography of the engineered surface was studied by AFM, confirming that the peptide monolayer is as smooth as the native GaAs surfaces. Furthermore, the orientation of the helical peptides was evaluated by FTIR. The established functionalization protocols can be transferred onto near-surface semiconductor nano-structures with GaAs cap layers such as quantum dots (QDs) and two-dimensional electron gases (2DEGs).