Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 81, Issue 2-3, Pages 313-315Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-4005(01)00972-8
Keywords
pH electrode; iridium oxide; metal oxide electrode; potentiometric sensor
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In this work, a long-term stable pH electrode based on iridium oxide film is reported. A new method, i.e., a 'carbonate melt oxidation' method, has been developed to fabricate iridium oxide pH electrode. In this method, a uniform iridium oxide film is coated on the surface of an iridium metal wire through oxidation of the wire in a carbonate melt. The electrode made this way shows a drift-free behavior in pH buffer solutions. Calibration curves for the same electrode implied that the electrode is very stable over a long period of 2.5 years. Therefore, the present electrode is very suitable for continuous pH measurement without the need of frequent calibration. (C) 2002 Elsevier Science B.V. All rights reserved.
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