Ionic Liquid based polymer electrolytes for electrochemical sensors

Jakub Altšmíd; Tomáš Syrový; Lucie Syrová; Petr Kuberský; Aleš Hamáček; Oldřich Zmeškal; Stanislav Nešpůrek

doi:10.5755/j01.ms.21.3.7371

Authors

Jakub Altšmíd Brno University of Technology University of West Bohemia
Tomáš Syrový University of Pardubice
Lucie Syrová University of Pardubice
Petr Kuberský University of West Bohemia
Aleš Hamáček University of West Bohemia
Oldřich Zmeškal Brno University of Technology
Stanislav Nešpůrek Brno University of Technology

DOI:

https://doi.org/10.5755/j01.ms.21.3.7371

Keywords:

NO2 sensor, ionic liquid, electrochemistry

Abstract

Amperometric NO₂printed sensor with a new type of solid polymer electrolyte and a carbon working electrode has been developed. The electrolytes based on 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [EMIM][N(Tf)₂], 1-butyl-3-methylimidazolium trifluoromethanesulfonate [BMIM][CF₃SO₃] and 1-ethyl-3-methylimidazolium tetrafluoroborate [EMIM][BF₄] ionic liquids were immobilized in poly(vinylidene fluoride) matrix [PVDF]. The analyte, gaseous nitrogen dioxide, was detected by reduction at -500 mV vs. platinum pseudoreference electrode. The sensors showed a linear behavior in the whole tested range, i.e., 0 - 5 ppm and their sensitivities were in order of 0.3 x∙10^-6 A/ppm. The sensor sensitivity was influenced by the electric conductivity of printing formulation; the higher the conductivity, the higher the sensor sensitivity. The rise/recovery times were in order of tens of seconds. The use of screen printing technology and platinum pseudoreference electrode simplify the sensor fabrication and it does not have any negative effect on the sensor stability.

DOI: http://dx.doi.org/10.5755/j01.ms.21.3.7371