Influence of oxygen and carbon dioxide on the electrochemical stability of poly(3,4-ethylenedioxythiophene) used as ion-to-electron transducer in all-solid-state ion-selective electrodes

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Vazquez M, Bobacka J, Ivaska A, Lewenstam A
Förläggare: ELSEVIER SCIENCE SA
Publiceringsår: 2002
Tidskrift: Sensors and Actuators B: Chemical
Tidskriftsakronym: SENSOR ACTUAT B-CHEM
Volym: 82
Nummer: 1
Artikelns första sida, sidnummer: 7
Artikelns sista sida, sidnummer: 13
Antal sidor: 7
ISSN: 0925-4005


Abstrakt

The electrochemical stability of poly(3,4-ethylenedioxythiophene) (PEDOT) is studied in view of its use as ion-to-electron transducer (solid contact) in all-solid-state ion-selective electrodes (ISEs). PEDOT is electrochemically deposited on glassy carbon (GC) and the resulting GC/PEDOT electrodes are studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and potentiometry. Valinomycin-based all-solid-state K+-ISEs are constructed by placing a K+-selective poly(vinyl chloride) (PVC)-based membrane on the GC/PEDOT electrode (solid contact). The influence of dissolved O-2 and CO2 on the potential of the GC/PEDOT electrodes and of all-solid-state K+-ISEs is studied. PEDOT is compared with polypyrrole (PPy) as the solid contact material. A significant difference between the two conducting polymers (CPs) is that PEDOT is less sensitive to O-2 and CO2 (pH) than PPy. Therefore, PEDOT is a promising new candidate as ion-to-electron transducer (solid contact) in all-solid-state ISEs based on solvent polymeric membranes that are permeable to O-2 and CO2. (C) 2002 Elsevier Science B.V. All rights reserved.


Nyckelord

All-solid-state ion-selective electrode, Potential stability

Senast uppdaterad 2019-10-12 vid 02:42