Electrochemical nitrite nanosensor developed with amine- and sulphate-functionalised polystyrene latex beads self-assembled on polyaniline

Munkombwe Muchindu, Tesfaye Waryo, Omotayo Arotiba, Ewa Kazimierska, Aoife Morrin, Anthony J. Killard, Malcolm R. Smyth, Nazeem Jahed, Boitumelo Kgarebe, Priscilla G.L. Baker, Emmanuel I. Iwuoha

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Aniline doped with polyvinyl sulphonate (PV-SO3-) was electropolymerised on screen printed carbon (SPCE) and glassy carbon (GCE) electrodes. Then nano-structured polystyrene (PSNP) latex beads functionalised with amine (PSNP-NH2) and sulphate (PSNP-OSO3-) were self-assembled on the modified SPCE and GCE. The resultant polyaniline nanocomposites (PANI|PSNP-NH2 or PANI|PSNP-OSO3-) were characterised by cyclic voltammetry (CV), UV-vis spectroscopy and scanning electron microscopy (SEM). Brown-Anson analysis of the multi-scan rate CV responses of the various PANI films gave surface concentrations of the order of 10-8 mol cm-2. UV-vis spectra of the PANI films dissolved in dimethyl sulphoxide showed typical strong absorbance maxima at 480 and 740 nm associated with benzenoid π-π* transition and quinoid excitons of polyaniline, respectively. The SEM images of the PANI nanocomposite films showed cauliflower-like structures that are <100 nm in diameter. When applied as electrochemical nitrite sensor, sensitivity values of 60, 40 and 30 μA/mM were obtained for electrode systems containing PANI|PSNP-NH2, PANI and PANI|PSNP-SO3-, respectively. The corresponding limits of detection of the sensors were 7.4, 9.2 and 38.2 μM NO2-.

Original languageEnglish
Pages (from-to)4274-4280
Number of pages7
JournalElectrochimica Acta
Volume55
Issue number14
DOIs
Publication statusPublished - 30 May 2010
Externally publishedYes

Keywords

  • Modified polystyrene latex beads
  • Nanocomposite
  • Nitrite nanosensor
  • Polyaniline
  • Polyvinyl sulphonate

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electrochemistry

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