Regensburg 2007 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 35: SYBM Bioinspired Materials
MM 35.3: Talk
Thursday, March 29, 2007, 15:15–15:30, H16
Bacterial S-layers used as bio-templates for the regular arrangement of nanoparticles — •Ute Queitsch1, Elias Mohn1, Franziska Schäffel1, Ludwig Schultz1, Bernd Rellinghaus1, Anja Blüher2, and Michael Mertig2 — 1IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — 2Max Bergmann Center for Materials Research, TU Dresden, D-01069 Dresden, Germany
Owing to the statistical nature of the deposition process nanoparticles from the gas phase are usually randomly distributed on the substrate. For many applications however, a regular arrangement of the particles is mandatory. We have therefore investigated to which degree the use of so-called S-layers – regular protein crystals with different 2-dimensional lattice symmetries – allows to compensate for this disadvantage. S-layers of bacillus sphaericus NCTC 9602 with p4 symmetry and a square lattice of pores with a lattice constant of 12.5 nm are used as bio-templates for the deposition of gas-phase prepared FePt nanoparticles. Sheets of these S-layers were deposited onto amorphous carbon films, which were then exposed to a beam of FePt nanoparticles under high vacuum conditions. Structural characterization of likewise prepared particle films is carried out by transmission electron microscopy (TEM). We find that the structure of the S-layers remains unaltered upon particle deposition. Furthermore, a symmetry transfer from the bio-template to the arrangement of the deposited particles is clearly observed. Statistical analysis of the TEM micrographs reveals that the majority of the particles are located within or in the close vicinity of the pores of the bio-template.