ION SENSOR

摘要

An ion sensor (30) includes a redox layer (8) covering at least part of a wiring (7a) extended from an isolated gate (7) or the gate of a junction FET, and an ion-sensitive layer (9) covering the surface of the redox layer. The ion sensor exhibits excellent noise characteristics or high-speed operation characteristics owing to the use of the junction FET, and is not affected by moisture or visible light owing to its isolated gate construction. Concentrations of a variety of ions can also be measured simultaneously by using a plurality of junction FET's.