An investigation of the conductivity of peptide nanotube networks prepared by enzyme-triggered self-assembly

Haixia Xu, Apurba K. Das, Masaki Horie, Majeed S. Shaik, Andrew M. Smith, Yi Luo, Xiaofeng Lu, Richard Collins, Steven Y. Liem, Aimin Song, Paul L. A. Popelier, Michael L. Turner, Ping Xiao, Ian A. Kinloch, Rein V. Ulijn

Research output: Contribution to journalArticle

112 Citations (Scopus)

Abstract

We demonstrate that nanotubular networks formed by enzyme-triggered self-assembly of Fmoc-L-3 (9-fluorenylmethoxycarbonyl-tri-leucine) show significant charge transport. FT-IR, fluorescence spectroscopy and wide angle X-ray scattering (WAXS) data confirm formation of beta-sheets that are locked together via pi-stacking interactions. Molecular dynamics simulations confirmed the pi-pi stacking distance between fluorenyl groups to be 3.6-3.8 angstrom. Impedance spectroscopy demonstrated that the nanotubular xerogel networks possess minimum sheet resistances of 0.1 M Omega/sq in air and 500 M Omega/sq in vacuum (pressure: 1.03 mbar) at room temperature, with the conductivity scaling linearly with the mass of peptide in the network. These materials may provide a platform to interface biological components with electronics.

Original languageEnglish
Pages (from-to)960-966
Number of pages7
JournalNanoscale
Volume2
Issue number6
Early online date6 Apr 2010
DOIs
Publication statusPublished - 2010

Keywords

  • investigation
  • conductivity
  • peptide nanotube networks
  • enzyme-triggered self-assembly

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