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Sensors 2017, 17(8), 1716; https://doi.org/10.3390/s17081716

A Disposable Amperometric Sensor Based on High-Performance PEDOT:PSS/Ionic Liquid Nanocomposite Thin Film-Modified Screen-Printed Electrode for the Analysis of Catechol in Natural Water Samples

1
West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, Legon, Accra, Ghana
2
Department of Biochemistry, Cell & Molecular Biology, University of Ghana, Legon, Accra, Ghana
3
Nanotechnology & Integrated Bioengineering Centre, Ulster University, Jordanstown BT37 0QB, UK
*
Author to whom correspondence should be addressed.
Received: 8 June 2017 / Revised: 12 July 2017 / Accepted: 13 July 2017 / Published: 26 July 2017
(This article belongs to the Special Issue Screen-Printed Electrodes)
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Abstract

A conducting polymer-based composite material of poly(3,4-ethylenedioxythiophene) (PEDOT): poly(4-styrenesulfonate) (PSS) doped with different percentages of a room temperature ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]), was prepared and a very small amount of the composite (2.0 µL) was drop-coated on the working area of a screen-printed carbon electrode (SPCE). The SPCE, modified with PEDOT:PSS/IL composite thin-film, was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), profilometry and sessile contact angle measurements. The prepared PEDOT:PSS/IL composite thin-film exhibited a nano-porous microstructure and was found to be highly stable and conductive with enhanced electrocatalytic properties towards catechol, a priority pollutant. The linear working range for catechol was found to be 0.1 µM–330.0 µM with a sensitivity of 18.2 mA·mM·cm−2 and a calculated limit of detection (based on 3× the baseline noise) of 23.7 µM. When the PEDOT:PSS/IL/SPCE sensor was used in conjunction with amperometry in stirred solution for the analysis of natural water samples, the precision values obtained on spiked samples (20.0 µM catechol added) (n = 3) were 0.18% and 0.32%, respectively, with recovery values that were well over 99.0%. View Full-Text
Keywords: room temperature ionic liquids; PEDOT:PSS; disposable sensors; cyclic voltammetry; electrochemical impedance spectroscopy; screen-printed electrodes; conducting polymers; nanocomposites; hexacyanoferrate; sessile contact angle measurement room temperature ionic liquids; PEDOT:PSS; disposable sensors; cyclic voltammetry; electrochemical impedance spectroscopy; screen-printed electrodes; conducting polymers; nanocomposites; hexacyanoferrate; sessile contact angle measurement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Krampa, F.D.; Aniweh, Y.; Awandare, G.A.; Kanyong, P. A Disposable Amperometric Sensor Based on High-Performance PEDOT:PSS/Ionic Liquid Nanocomposite Thin Film-Modified Screen-Printed Electrode for the Analysis of Catechol in Natural Water Samples. Sensors 2017, 17, 1716.

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