Regensburg 2004 – wissenschaftliches Programm
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O: Oberflächenphysik
O 4: Organische Dünnschichten I
O 4.7: Vortrag
Montag, 8. März 2004, 12:45–13:00, H43
Electronic Structure of Self-Assembled Bacterial S-Layers — •Serguei Molodtsov1, Denis Vyalikh1, Steffen Danzenbächer1, Michael Mertig2, Alexander Kirchner2, Wolfgang Pompe2, and Yuriy Dedkov3 — 1Inst. f. Festkörperphysik, TU Dresden — 2Inst. f. Werkstoffwissenschaft, TU Dresden — 3II. Physikalisches Institut, RWTHA
The discovered possibility to grow thin self-organized biological films on appropriate substrates is one of the mostly important recent achievements of materials science. Various branches of microelectronics already advance by this unique possibility. To make further progress in these fields, thorough information about electronic structure of grown layers is required. The corresponding data are lacking, however, since the biological substances are quite sensitive to exposure and can easily be destroyed by irradiation as necessary for spectroscopic techniques usually used to study electronic structure of solids.
We present first results of photoemission and x-ray absorption study of ordered films of bacterial cell well proteins (S-layer) of Bacillus sphaericus and Sporosarcina ureae. The films under study are found to be wide-gap semiconductors. Similar to organic materials both the occupied and the unoccupied electron densities of states represent series of peaks, which can be related to the molecular-like electron orbitals.