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Sensors 2015, 15(11), 28421-28434; doi:10.3390/s151128421

An Electrochemical NO2 Sensor Based on Ionic Liquid: Influence of the Morphology of the Polymer Electrolyte on Sensor Sensitivity

Department of Technologies and Measurement, Faculty of Electrical Engineering/RICE, University of West Bohemia, Plzeň 306 14, Czech Republic
Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, 612 00 Brno, Czech Republic
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editors: Xiangqun Zeng, Michael T. Carter and Abdul Rehman
Received: 29 September 2015 / Revised: 31 October 2015 / Accepted: 4 November 2015 / Published: 11 November 2015
(This article belongs to the Special Issue Ionic Liquids)
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A systematic study was carried out to investigate the effect of ionic liquid in solid polymer electrolyte (SPE) and its layer morphology on the characteristics of an electrochemical amperometric nitrogen dioxide sensor. Five different ionic liquids were immobilized into a solid polymer electrolyte and key sensor parameters (sensitivity, response/recovery times, hysteresis and limit of detection) were characterized. The study revealed that the sensor based on 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][N(Tf)2]) showed the best sensitivity, fast response/recovery times, and low sensor response hysteresis. The working electrode, deposited from water-based carbon nanotube ink, was prepared by aerosol-jet printing technology. It was observed that the thermal treatment and crystallinity of poly(vinylidene fluoride) (PVDF) in the solid polymer electrolyte influenced the sensitivity. Picture analysis of the morphology of the SPE layer based on [EMIM][N(Tf)2] ionic liquid treated under different conditions suggests that the sensor sensitivity strongly depends on the fractal dimension of PVDF spherical objects in SPE. Their deformation, e.g., due to crowding, leads to a decrease in sensor sensitivity. View Full-Text
Keywords: ionic liquid; amperometric NO2 sensor; carbon nanotube; aerosol-jet printing ionic liquid; amperometric NO2 sensor; carbon nanotube; aerosol-jet printing

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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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Kuberský, P.; Altšmíd, J.; Hamáček, A.; Nešpůrek, S.; Zmeškal, O. An Electrochemical NO2 Sensor Based on Ionic Liquid: Influence of the Morphology of the Polymer Electrolyte on Sensor Sensitivity. Sensors 2015, 15, 28421-28434.

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