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Poly(brilliant green)/carbon nanotube-modified carbon film electrodes and application as sensors

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Abstract

Poly(brilliant green) (PBG) films were formed on carbon film electrodes (CFE) by electropolymerisation of brilliant green monomer using potential cycling or at fixed potential from different pH solutions. The modified electrodes, PBG/CFE, were characterised by cyclic voltammetry (CV) in electrolytes of different pH by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). In order to increase the stability of the polymer film and enhance the response, multi-walled carbon nanotubes (MWCNTs) were first deposited on CFE and then PBG was formed on top, PBG/CNT/CFE. The modified electrodes were applied to the amperometric determination of ascorbic acid (AA) in phosphate buffer pH 7.0 at 0.0 V vs. saturated calomel electrode (SCE) and the results were compared, the presence of CNT leading to a significant increase in sensitivity. An interference study was carried out and good separation between AA and dopamine (DA) peaks was achieved that led to the successful determination of DA without interferences. Other interferents: aspirin, acetaminophen, salicylic acid and uric acid exhibited no response on the PBG/CNT/CFE. Determination of AA in pharmaceutical samples was successfully performed.

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Acknowledgments

Financial support from Fundação para a Ciência e a Tecnologia (FCT), Portugal, PTDC/QUI-QUI/116091/2009, POCH, POFC-QREN (co-financed by FSE and European Community Fund FEDER/COMPETE), and FCT project PEst-C/EME/UI0285/2011 (CEMUC®—Research Unit 285), Portugal, are gratefully acknowledged. M.E.G. thanks FCT for postdoctoral fellowship SFRH/BPD/36930/2007. Y.W. thanks the European Commission for a grant under the Erasmus student exchange programme.

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Authors and Affiliations

  1. Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004-535, Coimbra, Portugal

    M. Emilia Ghica, Y. Wintersteller & Christopher M. A. Brett

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  1. M. Emilia Ghica
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  2. Y. Wintersteller
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  3. Christopher M. A. Brett
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Correspondence to Christopher M. A. Brett.

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Ghica, M.E., Wintersteller, Y. & Brett, C.M.A. Poly(brilliant green)/carbon nanotube-modified carbon film electrodes and application as sensors. J Solid State Electrochem 17, 1571–1580 (2013). https://doi.org/10.1007/s10008-013-2040-4

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  • DOI: https://doi.org/10.1007/s10008-013-2040-4

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