Capacitive Model for Coulometric Readout of Ion-Selective Electrodes

Zdeňka Jarolímova, Tingting Han, Ulriika Mattinen, Johan Bobacka, Eric Bakker

Tutkimustuotos: LehtiartikkeliArtikkeliTieteellinenvertaisarvioitu

26 Sitaatiot (Scopus)

Abstrakti

We present here a capacitive model for the coulometric signal transduction readout of solid-contact ion-selective membrane electrodes (SC-ISE) with a conducting polymer (CP) as an intermediate layer for the detection of anions. The capacitive model correlates well with experimental data obtained for chloride-selective SC-ISEs utilizing poly(3,4-ethylenedioxythiophene) (PEDOT) doped with chloride as the ion-to-electron transducer. Additionally, Prussian blue is used as a simple sodium capacitor to further demonstrate the role of the transduction layer. The influence of different thicknesses of PEDOT as a conducting polymer transducer, different thicknesses of the overlaying ion-selective membranes deposited by drop casting and spin coating, and different compositions of the chloride-selective membrane are explored. The responses are evaluated in terms of current-time, charge-time, and charge-chloride activity relationships. The utility of the sensor with coulometric readout is illustrated by the monitoring of very small concentration changes in solution.
AlkuperäiskieliEi tiedossa
Sivut8700–8707
Sivumäärä8
JulkaisuAnalytical Chemistry
Vuosikerta90
Numero14
DOI - pysyväislinkit
TilaJulkaistu - 2018
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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