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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Electrochemical nitrite nanosensor developed with amine- and sulphate-functionalised polystyrene latex beads self-assembled on polyaniline
Electrochimica Acta, Volume 55, No. 14, Year 2010
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Description
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-. © 2009 Elsevier Ltd.
Authors & Co-Authors
Muchindu, Munkombwe
South Africa, Bellville
University of the Western Cape
Waryo, Tesfaye T.
South Africa, Bellville
University of the Western Cape
Arotiba, Omotayo A.
South Africa, Bellville
University of the Western Cape
Kazimierska, Ewa A.
Ireland, Dublin
Dublin City University
Morrin, Aoife
Ireland, Dublin
Dublin City University
Killard, Anthony J.
Ireland, Dublin
Dublin City University
Smyth, Malcolm R.
Ireland, Dublin
Dublin City University
Jahed, Nazeem M.
South Africa, Bellville
University of the Western Cape
Kgarebe, Boitumelo V.
South Africa, Bellville
University of the Western Cape
Baker, P. G.L.
South Africa, Bellville
University of the Western Cape
Iwuoha, Emmanuel Iheanyichukwu
South Africa, Bellville
University of the Western Cape
Statistics
Citations: 35
Authors: 11
Affiliations: 2
Identifiers
Doi:
10.1016/j.electacta.2009.06.047
ISSN:
00134686
Research Areas
Environmental