Spectroscopic studies of the electronic properties of regularly arrayed two-dimensional protein layers
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
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
Original language | English |
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Pages (from-to) | S131-S144 |
Number of pages | 14 |
Journal | Journal of Physics-Condensed Matter |
Volume | 18 |
Issue number | 13 |
Publication status | Published - 5 Apr 2006 |
Peer-reviewed | Yes |
Workshop
Title | International Workshop on Self-Organized Nanostructures |
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Duration | 17 - 23 July 2005 |
Degree of recognition | International event |
City | Cargese |
Country | France |
External IDs
Scopus | 33645102163 |
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Keywords
Keywords
- Absorption fine-structure, Inner-shell excitation, Surface-layers, S-layer, Nanoparticle arrays, Glycyl-glycine, Photoemission, Organization, Fabrication, Spectra