Issue 6, 2010
From the journal:

Nanoscale

An investigation of the conductivity of peptidenanotube networks prepared by enzyme-triggered self-assembly†

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

* Corresponding authors

a School of Materials, The University of Manchester, Manchester, UK
E-mail: ian.kinloch@manchester.ac.uk

b WestCHEM/Department of Pure and Applied Chemistry, The University of Strathclyde, Glasgow, UK, UK
E-mail: Rein.Ulijn@strath.ac.uk
Tel: (+)44 0141 5482110

c School of Chemistry, The University of Manchester, Manchester, UK

d School of EEE, The University of Manchester, Manchester, UK

e Manchester Interdisciplinary Biocentre, The University of Manchester, Manchester, UK

Abstract

We demonstrate that nanotubular networks formed by enzyme-triggered self-assembly of Fmoc-L3 (9-fluorenylmethoxycarbonyl-tri-leucine) show significant charge transport. FT-IR, fluorescence spectroscopy and wide angle X-ray scattering (WAXS) data confirm formation of β-sheets that are locked together via π-stacking interactions. Molecular dynamics simulations confirmed the π–π stacking distance between fluorenyl groups to be 3.6–3.8 Å. Impedance spectroscopy demonstrated that the nanotubular xerogel networks possess minimum sheet resistances of 0.1 MΩ/sq in air and 500 MΩ/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.

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

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Article information

DOI
https://doi.org/10.1039/B9NR00233B
Article type
Paper
Submitted
23 Aug 2009
Accepted
16 Feb 2010
First published
06 Apr 2010

Nanoscale, 2010,2, 960-966

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

H. Xu, A. K. Das, M. Horie, M. S. Shaik, A. M. Smith, Y. Luo, X. Lu, R. Collins, S. Y. Liem, A. Song, P. L. A. Popelier, M. L. Turner, P. Xiao, I. A. Kinloch and R. V. Ulijn, Nanoscale, 2010, 2, 960 DOI: 10.1039/B9NR00233B

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