Microcavity based solid-contact ion-selective microelectrodes

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)

Interna författare/redaktörer

Publikationens författare: Sundfors F, Bereczki R, Bobacka J, Toth K, Ivaska A, Gyurcsanyi RE
Publiceringsår: 2006
Tidskrift: Electroanalysis
Tidskriftsakronym: ELECTROANAL
Volym: 18
Nummer: 13-14
Artikelns första sida, sidnummer: 1372
Artikelns sista sida, sidnummer: 1378
Antal sidor: 7
ISSN: 1040-0397


A novel design and fabrication procedure is proposed for the preparation of robust ionophore based ion-selective microelectrodes. The essential component of the new design is a microcavity that is formed after recessing a voltarnmetric inlaid disk type gold microelectrode by chemical etching of the gold microwire. The microcavity of ca. 50 pL volume and 25 mu m diameter accommodates the inherently conducting polymeric inner contact and the ionselective liquid membrane, which are thereby mechanically protected from the sample environment. As inner contacts poly(3,4-ethylenedioxythiophene) (PEDOT) films doped with poly (4-styrenesulfonate) (PSS) and tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (TFPB) electropolymerized from aqueous and organic solvents, respectively, were used. Potassium- and calcium-selective microelectrodes fabricated according to the new procedure exhibited potentiometric characteristics similar to the conventional electrodes. The formation of an aqueous layer below the ion-selective membrane could be avoided by using the proposed electrode construction.


inherently conducting polymers, ion-selective microelectrode, microcavity, PEDOT, Solid contact

Senast uppdaterad 2020-26-02 vid 06:51