Abstract
Conducting polymers have been synthesised electrochemically from 4-amino-3-hydroxynaphthalene-1-sulfonic acid (4A3HN1SA), 4-aminonaphthalene-1-sulfonic acid (4AN1SA) and 7-amino-4-hydroxynaphthalene-2-sulfonic acid (7A4HN2SA) on glassy carbon electrodes. The influence of the positive potential limit on the potential cycling polymerisation of 4A3HN1SA was studied, and a sufficiently high potential limit allowed better film growth. Under similar polymerisation conditions, the three monomers showed different radical formation potentials and different voltammetric peak profiles. The effects of scan rate and solution pH on the electrochemical properties of the polymers were investigated, in the range between 10 and 200 mV s−1, all the modified electrodes showing a surface-confined electrode process. In the pH range from 2.0 to 9.0, the anodic peak potentials decreased linearly with increasing pH for all the three modified electrodes. The modified electrodes were characterised by electrochemical impedance spectroscopy in pH 4.0 and 7.0 buffer solutions. The results showed a more porous poly(7A4HN2SA) film, which is less affected by pH change than the other two films. Scanning electron microscopy of the polymer films also showed significant differences in their morphologies.
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Acknowledgments
Financial support from the Fundação para a Ciência e a Tecnologia (FCT), Portugal PTDC/QUI-QUI/116091/2009, POCH, POFC-QREN (co-financed by the FSE and European Community FEDER funds through the program COMPETE – Programa Operacional Factores de Competitividade under the projects PEst-C/EME/UI0285/2013) and CENTRO-07-0224-FEDER-002001 (MT4MOBI)) is gratefully acknowledged and Dr. Madalina M. Barsan is thanked for her help with the impedance experiments. A.G is grateful to the Coimbra Group for its support through Coimbra Group Short Stay Scholarship Programme for young researchers from Sub-Saharan Africa. He acknowledges Samara University, Ethiopia, for granting research leave.
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Geto, A., Brett, C.M.A. Electrochemical synthesis, characterisation and comparative study of new conducting polymers from amino-substituted naphthalene sulfonic acids. J Solid State Electrochem 20, 2969–2979 (2016). https://doi.org/10.1007/s10008-016-3338-9
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DOI: https://doi.org/10.1007/s10008-016-3338-9