Abstract
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.
Original language | Undefined/Unknown |
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Pages (from-to) | 1372–1378 |
Number of pages | 7 |
Journal | Electroanalysis |
Volume | 18 |
Issue number | 13-14 |
DOIs | |
Publication status | Published - 2006 |
MoE publication type | A1 Journal article-refereed |
Keywords
- ion-selective microelectrode
- microcavity
- inherently conducting polymers
- Solid contact
- PEDOT