Study on soluble polypyrrole as a component in all-solid-state ion-sensors

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Tom Lindfors, Johan Bobacka, Andrzej Lewenstam, Ari Ivaska
Publication year: 1998
Journal: Electrochimica Acta
Journal acronym: ELECTROCHIM ACTA
Volume number: 43
Issue number: 23
Start page: 3503
End page: 3509
Number of pages: 7
ISSN: 0013-4686
eISSN: 1873-3859


Soluble conducting polypyrrole (PPy) was chemically synthesized by using dodecylbenzene sulfonic acid (DBSA) as dopant. Electrodes were prepared by solution casting on glassy carbon (GC) substrates. They were characterized by potentiometric, cyclic voltammetric (CV) and electrochemical impedance spectroscopic (EIS) measurements. PPy(DBSA) modified electrodes showed good reproducible cationic response to Ca with the sensitivity of 27.2 +/- 0.2 mV decade(-1) which remained practically constant over 10 d. The standard potential, however, was found to drift 70 mV over the same time period. The doping process of the PPy(DBSA) film was investigated by cyclic voltammetry and EIS in 0.1 M CaCl2. The most significant change in the impedance spectra of the PPy(DBSA) film takes place between -500 mV and -400 mV which coincides with the beginning of the oxidation wave in the cyclic voltammogram of the film. The impedance spectra were fitted to an equivalent circuit and the redox sensitivity of the PPy(DBSA) film was also studied.


potentiometric sensor, soluble polypyrrole

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