Plasticizer-free all-solid-state potassium-selective electrode based on poly(3-octylthiophene) and valinomycin

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Bobacka J, Ivaska A, Lewenstam A
Publication year: 1999
Journal: Analytica Chimica Acta
Journal acronym: ANAL CHIM ACTA
Volume number: 385
Start page: 195
End page: 202
Number of pages: 8
ISSN: 0003-2670


All-solid-state potassium-selective electrodes with plasticizer-free membranes were prepared by incorporation of valinomycin as the ionophore and potassium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate as the lipophilic additive in a semiconducting conjugated polymer matrix of poly(3-octylthiophene). The membrane components were dissolved in chloroform and deposited on glassy carbon by solution casting resulting in all-solid-state potassium sensors. The analytical performance of the potassium sensors were studied by potentiometric measurements. Electrochemical impedance spectroscopy was used to obtain information about the charge transfer and double layer charging processes in the electrodes. The results show that a plasticizer-free all-solid-state potassium-selective electrode can he prepared and that the electron transfer at the glassy carbon/membrane interface plays a significant role in the signal transduction. (C) 1999 Elsevier Science B.V. All rights reserved.


all-solid-state chemical sensor, IMPEDANCE, plasticizer-free, potassium ion-selective electrode

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