Compound chemically sensitive element
AssigneeOlympus Optical Co., Ltd.
InventorKiyozo Koshiishi
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Abstract
A compound chemically sensitive element comprises a chemically sensitive assembly which is selectively sensitive to a specific ion or a specific substance in a material to be examined, and a pH sensor having an insulated gate field effect transistor structure, both of which are separately manufactured. The chemically sensitive assembly and the insulated gate of the pH sensor are electrochemically connected together by a conductive resin, thus improving the durability and the selectivity of the element. In this manner, limitations imposed upon the manufacture of MOS pH sensor is removed, permitting a wide variety of chemically sensitive films to be used.
Claims14
A compound chemically sensitive element in which a potential difference developed across an interface between a solution to be examined and an ion sensitive assembly in accordance with the concentration of a specific ion contained in the solution is applied to an insulated gate of a pH sensor having an insulated gate field effect transistor structure, and in which a change in the source-drain current of the pH sensor is detected to determine the concentration of the specific ion in the solution, comprising
- an ion sensitive assembly, a pH sensor having an insulated gate field effect transistor structure, the sensor having an insulated gate and a conductive resin electrochemically connecting the assembly and insulated gate.
Dependencies are inferred from the claim text.