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    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

    Year: 2017

    Journal: Sensors, Volume 17, AUG

    Authors: Krampa, Francis D.; Aniweh, Yaw; Awandare, Gordon A.; Kanyong, Prosper

    Organizations: World Bank African Centres of Excellence grant [ACE02-WACCBIP]; DELTAS Africa grant [DEL-15-007]; WACCBIP-World Bank ACE PhD fellowship; DELTAS Africa postdoctoral fellowship; African Academy of Sciences (AAS)'s Alliance for Accelerating Excellence in Science in Africa (AESA); New Partnership for Africa's Development Planning and Coordinating (NEPAD) Agency; Wellcome Trust [107755/Z/15/Z]; UK government

    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

    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 mu L) 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 mu M-330.0 mu M with a sensitivity of 18.2 mA.mM.cm(2) and a calculated limit of detection (based on 3 x the baseline noise) of 23.7 mu M. 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 mu M catechol added) (n = 3) were 0.18% and 0.32%, respectively, with recovery values that were well over 99.0%.
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