COLL 513 |
| Michael Zharnikov1, Andrey Shaporenko1, Klaus Adlkofer2, Lars S. O. Johansson3, Motomu Tanaka2, and Michael Grunze1. (1) Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, Heidelberg, 69120, Germany, (2) Lehrstuhl für Biophysik E22, Technische Universität München, James-Franck-Strasse, Garching b. München, 85748, (3) Department of Physics, Karlstad University, Universitetsgatan 1, Karlstad, 65188, Sweden |
| Stochiometric GaAs (100) surfaces were functionalized with monolayers of an aromatic compound, 1,1'-biphenyl-4-thiol (BPT), and the engineered surfaces were studied by synchrotron-based high resolution x-ray photoelectron spectroscopy and near edge x-ray absorption fine structure spectroscopy. BPT molecules were found to form well ordered and densely packed self-assembled monolayer on these substrates. The attachment to the substrate occurs over the thiolate headgroup while the intact biphenyl moieties have an upright orientation with an average tilt angle of 31.4°. The functionalization of GaAs by BPT was found to prevent an oxidation and contamination of the substrate, keeping the GaAs surface in a pristine state. The surface engineering of GaAs with functionalized aromatic monolayers can provide a crucial link for combining GaAs-based semiconductor nanostructures with bio-organic molecular assemblies. |
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Adamson Award Symposium Honoring Dave Allara and Ralph Nuzzo
Division of Colloid and Surface Chemistry |