Iodine doped polythienylene coated electrode

Abstract

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 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 -1 to about 10 -7 .

Inventors

• 👤 A. Ersin Karagozler
• 👤 Harry B. Mark, Jr.
• 👤 Hans Zimmer
• 👤 Ahmed Galal

Bibliographic Details