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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus

12 Issues per year


IMPACT FACTOR 2017: 1.144
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Online
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2196-7156
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Volume 229, Issue 3

Issues

Supramolecular Assembly of Functional Hybrid Fibrils with Peptide-π-System-Peptide Monomers Near Silver-Nanoparticles

Christian Elsner
  • Leibniz-Institute of Surface Modification (IOM), Permoser Strasse 15, 04318 Leipzig, Germany
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/ Daniel Hintzen
  • Leibniz-Institute of Surface Modification (IOM), Permoser Strasse 15, 04318 Leipzig, Germany
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/ Andrea Prager
  • Leibniz-Institute of Surface Modification (IOM), Permoser Strasse 15, 04318 Leipzig, Germany
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/ Katrin R. Siefermann
  • Leibniz-Institute of Surface Modification (IOM), Permoser Strasse 15, 04318 Leipzig, Germany
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/ Bernd Abel
  • Corresponding author
  • Leibniz-Institute of Surface Modification (IOM), Permoser Strasse 15, 04318 Leipzig, Germany
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Published Online: 2015-01-15 | DOI: https://doi.org/10.1515/zpch-2014-0639

Abstract

Oligopeptides containing internal π-system units are shown to self-assemble in water near nanoparticles into fibrillar nanostructures. We have investigated the biopolymer hybrid monomer of the overall structure `peptide-π-system-peptide' with the sequence VDFAG – perylene diimide (PDI) – GAFDV in the presence of Ag-nanoparticles. Unique to these self-assembling monomers is the fact that the π-conjugated unit has been directly embedded within the peptide backbone by way of a special synthetic coupling. The symmetric peptide-based molecular design enforces intimate π-π communication within the aggregates after self-assembly, making these nano structures attractive for optical or electronic applications. The assembly process can in principle be followed by the change in optical spectra of the monomer and ordered monomer π-systems. Here we show that the Ag-nanoparticles act as seeds for the fibrillation, which makes the fibrils grow in a defined fashion and the supramolecular assembly can be followed via the optical spectrum of the plasmon resonances of the silver nanoparticles, which depend sensitively upon the local environment, making the optical plasmon resonance spectra a nice probe for the assembly process, as well as the interaction of monomers and fibrillar structures in contact with the nanoparticles. While it has been known that these systems may aggregate under certain conditions towards nano fibrils the new aspect here is the controlled and accelerated fibrillation near silver nanoparticles, which results in fibrils of 15–150 nm in diameter and up to 10 μm long, partially incorporating the seed nanoparticles. This approach provides a novel avenue to synthesize bioorganic-hybrid systems (in high yields) in contact with Ag metal nanoparticles and possibly enables us to control the location of growth for the materials in future applications.

Keywords: Supramolecular Assembly; Peptides; π-Systems; Spectroscopy; Nanoscale Imaging; Functional Materials

About the article

Accepted: 2014-12-05

Received: 2014-10-21

Published Online: 2015-01-15

Published in Print: 2015-03-28


Citation Information: Zeitschrift für Physikalische Chemie, Volume 229, Issue 3, Pages 427–442, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1515/zpch-2014-0639.

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