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

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


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Publikationens författare: Tom Lindfors, Johan Bobacka, Andrzej Lewenstam, Ari Ivaska
Förläggare: PERGAMON-ELSEVIER SCIENCE LTD
Publiceringsår: 1998
Tidskrift: Electrochimica Acta
Tidskriftsakronym: ELECTROCHIM ACTA
Volym: 43
Nummer: 23
Artikelns första sida, sidnummer: 3503
Artikelns sista sida, sidnummer: 3509
Antal sidor: 7
ISSN: 0013-4686
eISSN: 1873-3859


Abstrakt

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.


Nyckelord

potentiometric sensor, soluble polypyrrole

Senast uppdaterad 2019-14-10 vid 06:09