Journal of Solid State Electrochemistry

, Volume 15, Issue 11, pp 2675–2681

Tuning percolation speed in layer-by-layer assembled polyaniline–nanocellulose composite films

  • Sara Shariki
  • Soon Yee Liew
  • Wim Thielemans
  • Darren A. Walsh
  • Charles Y. Cummings
  • Liza Rassaei
  • Matthew J. Wasbrough
  • Karen J. Edler
  • Michael J. Bonné
  • Frank Marken
Original Paper

DOI: 10.1007/s10008-010-1261-z

Cite this article as:
Shariki, S., Liew, S.Y., Thielemans, W. et al. J Solid State Electrochem (2011) 15: 2675. doi:10.1007/s10008-010-1261-z

Abstract

Polyaniline of low molecular weight (ca. 10 kDa) is combined with cellulose nanofibrils (sisal, 4–5 nm average cross-sectional edge length, with surface sulphate ester groups) in an electrostatic layer-by-layer deposition process to form thin nano-composite films on tin-doped indium oxide (ITO) substrates. AFM analysis suggests a growth in thickness of ca. 4 nm per layer. Stable and strongly adhering films are formed with thickness-dependent coloration. Electrochemical measurements in aqueous H2SO4 confirm the presence of two prominent redox waves consistent with polaron and bipolaron formation processes in the polyaniline–nanocellulose composite. Measurements with a polyaniline–nanocellulose film applied across an ITO junction (a 700 nm gap produced by ion beam milling) suggest a jump in electrical conductivity at ca. 0.2 V vs. SCE and a propagation rate (or percolation speed) two orders of magnitude slower compared to that observed in pure polyaniline This effect allows tuning of the propagation rate based on the nanostructure architecture. Film thickness-dependent electrocatalysis is observed for the oxidation of hydroquinone.

Keywords

PolyanilinePANIPercolationPhase propagation rateVoltammetryCelluloseNanocrystalNanofibrilLayer-by-layer assemblyJunctionElectrochromismElectrocatalysis

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Sara Shariki
    • 1
  • Soon Yee Liew
    • 2
    • 3
  • Wim Thielemans
    • 2
    • 3
  • Darren A. Walsh
    • 2
  • Charles Y. Cummings
    • 1
  • Liza Rassaei
    • 1
  • Matthew J. Wasbrough
    • 1
  • Karen J. Edler
    • 1
  • Michael J. Bonné
    • 1
  • Frank Marken
    • 1
  1. 1.Department of ChemistryUniversity of BathBathUK
  2. 2.School of ChemistryUniversity of NottinghamNottinghamUK
  3. 3.Faculty of Engineering, Process and Environmental Research DivisionUniversity of NottinghamNottinghamUK