Abstract
A new dissolved oxygen sensor based on a pH-ISFET is discussed. A working electrode surrounding a pH-sensing gate of the pH-ISFET electrolyzes dissolved oxygen, resulting in a corresponding pH change near the pH-sensing gate. The pH-ISFET is expected to determine dissolved oxygen concentration by detecting this pH change. The results suggest that the proposed sensor operated by a combined mechanism of an amperometric sensor (Clark type sensor) and a potentiometric sensor (pH-ISFET) is feasible to determine the content of dissolved oxygen. The dependence of sensor output on several factors, such as buffering capacity, bulk pH and stirring of the solution, is investigated and a comparison between the Clark type sensor and proposed sensor is also discussed.
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