Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1991-03-04
1993-11-02
Niebling, John
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204418, 204419, 20415313, G01N 2726
Patent
active
052581110
ABSTRACT:
An iodide-doped, polythienylene coated electrode suitable for a potentiometric iodide ion sensor and a method for its manufacture are disclosed. The electrode is prepared by polymerizing the polythienylene on a working surface thereof. To this end, the working surface is contacted with a monomer solution of thiophene monomer and an electrolyte dissolved in organic solvent. Thereafter the solution is subjected to either a substantially constant potential of about 1.6 volts to about 1.8 volts vs. Ag/AgCl or to a cycling potential between -0.1 volts and +1.8 volts vs. Ag/AgCl for a time period sufficient to polymerize a polythienylene film of the desired thickness onto the working surface of the electrode.
The polythienylene film on the working surface is then doped with I.sub.2 by placing the coated electrode in an aqueous solution of iodide salt under applied potential conditions of about +0.6 volts to about +1 volt vs. Ag/AgCl for a period of time sufficient to dope the polymer. The period of time is dependent upon the thickness of the film applied to the electrode. The produced electrode usually exhibits a response of about 55 mV/decade to about 65 mV/decade in iodide solutions with a molar iodide ion concentration of about 10.sup.-1 to about 10.sup.-7.
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Galal Ahmed
Karagozler A. Ersin
Mark, Jr. Harry B.
Zimmer Hans
Igoe Patrick J.
Niebling John
University of Cincinnati
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