Ultrathin carbon film electrodes from vacuum-carbonised cellulose nanofibril composite

Anne Vuorema, Mika Sillanpää, Liza Rassaei, Matthew J. Wasbrough, Karen J. Edler, Wim Thielemans, Sara E.C. Dale, Simon Bending, Daniel Wolverson, Frank Marken

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

A novel way to produce ultrathin transparent carbon layers on tin-doped indium oxide (ITO) substrates is developed. The ITO surface is coated with cellulose nanofibrils (from sisal) via layer-by-layer electrostatic binding with poly(diallyldimethylammonium chloride) or PDDAC acting as the binder. The cellulose nanofibril-PDDAC composite film is then vacuum-carbonised at 5008C. The resulting carbon films are characterised by atomic force microscopy (AFM), small angle X-ray scattering (SAXS), wide-angle X-ray scattering (WAXS), and Raman methods. Smooth carbon films with good adhesion to the ITO substrate are formed. The electrochemical characterisation of the carbon films is based on the oxidation of hydroquinone and the reduction of benzoquinone in aqueous phosphate buffer media. A modest effect of the cellulose nanofibril-PDDAC film on the rate of electron transfer is observed. The effect of the film on the rate of electron transfer after carbonisation is more dramatic. For a 40-layer cellulose nanofibril-PDDAC film after carbonisation a two-order of magnitude change in the rate of electron transfer occurs presumably due to a better interaction of the hydroquinone/benzoquinone system with the electrode surface.

Original languageEnglish
Pages (from-to)619-624
Number of pages6
JournalElectroanalysis
Volume22
Issue number6
DOIs
Publication statusPublished - Mar 2010
Externally publishedYes

Keywords

  • Benzoquinone
  • Carbonisation
  • Cellulose
  • Cyclic voltammetry
  • Hydroquinone
  • Impedance
  • Layer-by-layer
  • Nanofibrils
  • PDDAC
  • Poly(diallyldimethylammonium chloride)
  • Sensors

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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