Soluble semiconducting poly(3-octylthiophene) as a solid-contact material in all-solid-state chloride sensors

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)

Interna författare/redaktörer

Publikationens författare: Sjoberg-Eerola P, Nylund J, Bobacka J, Lewenstam A, Ivaska A
Publiceringsår: 2008
Tidskrift: Sensors and Actuators B: Chemical
Tidskriftsakronym: SENSOR ACTUAT B-CHEM
Volym: 134
Nummer: 2
Artikelns första sida, sidnummer: 878
Artikelns sista sida, sidnummer: 886
Antal sidor: 9
ISSN: 0925-4005


All-solid-state chloride sensors based on poly(3-octylthiophene) (POT) as ion-to-electron transducer were studied by electrochemical impedance spectroscopy (EIS) and potentiometric measurements. POT was deposited by solution casting on a glassy carbon (GC) substrate and then coated with a layer of plasticized PVC, containing tridodecylmethylammonium chloride (TDMACI) as the ion-exchanger. Highly reproducible and stable chloride sensors were fabricated with the concentration of TDMACI in the PVC membrane varying in the range of 5-15% (w/w). The presence of TDMACI also in the POT layer was found to significantly decrease the electrode impedance but did not influence the potentiometric response of the chloride sensors studied. Conditioning of the POT layer in AgNO3, prior to casting of the PVC membrane, slightly improved the potential stability of the electrode (due to the presence of silver in POT) but did not lower the detection limit. The response of the GC/POT/PVC-TDMACI electrode was comparable to that of GC/PEDOT/PVC-TDMACI electrode studied earlier. However, the GC/POT/PVC-TDMACI electrodes are easier to prepare, as the electropolymerization step of PEDOT solid-contact can be avoided. The absence of water (layers) between the solid-contact and the PVC-TDMACI membranes was verified by performing the so-called "water-layer test". (c) 2008 Elsevier B.V. All rights reserved.


all-solid-state chemical sensor, chloride sensor

Senast uppdaterad 2019-14-12 vid 04:52