Spectroscopic studies of the electronic properties of regularly arrayed two-dimensional protein layers
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
Photoemission ( PE) and near-edge x-ray absorption fine structure (NEXAFS) spectroscopy were applied to characterize electronic properties of the regular two-dimensional bacterial surface protein layer ( S layer) of Bacillus sphaericus NCTC 9602, which is widely used as a protein template for the bottom-up fabrication of advanced metallic and hybrid nanostructures. PE and NEXAFS at the C 1s, O 1s, and N 1s core levels show similar chemical states for each oxygen atom and also for each nitrogen atom, while carbon atoms exhibit a range of chemical environments in different functional groups of the amino acids. A series of characteristic NEXAFS peaks were assigned to particular molecular orbitals of the amino acids by applying a phenomenological building block model. It was found that the p clouds of aromatic rings make the main contribution to both the lowest unoccupied and highest occupied molecular orbitals. The two-dimensional protein crystal shows a semiconductor-like behaviour with a gap value of similar to 3.0 eV and the Fermi energy close to the bottom of the LUMO.
Details
Originalsprache | Englisch |
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Seiten (von - bis) | S131-S144 |
Seitenumfang | 14 |
Fachzeitschrift | Journal of Physics-Condensed Matter |
Jahrgang | 18 |
Ausgabenummer | 13 |
Publikationsstatus | Veröffentlicht - 5 Apr. 2006 |
Peer-Review-Status | Ja |
Workshop
Titel | International Workshop on Self-Organized Nanostructures |
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Dauer | 17 - 23 Juli 2005 |
Bekanntheitsgrad | Internationale Veranstaltung |
Stadt | Cargese |
Land | Frankreich |
Externe IDs
Scopus | 33645102163 |
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Schlagworte
Schlagwörter
- Absorption fine-structure, Inner-shell excitation, Surface-layers, S-layer, Nanoparticle arrays, Glycyl-glycine, Photoemission, Organization, Fabrication, Spectra