Ion-sensitive FET sensor
First Claim
Patent Images
1. An ion-sensitive FET sensor comprising:
- a MOSFET having a gate portion;
a redox layer containing at least one material capable of undergoing a quinone-hydroquinone type redox reaction covering a surface of an isolating membrane of the gate portion; and
an ion-sensitive layer exhibiting ion selectivity covering a surface of said redox layer, wherein said ion-sensitive layer generates a potential corresponding to a concentration of an ion of interest and said redox layer generates an electric field on the gate portion of the MOSFET corresponding to the potential generated by the ion-sensitive layer.
0 Assignments
0 Petitions
Accused Products
Abstract
An ion-sensitive FET sensor has a MOSFET gate isolating membrane whose surface is covered by an ion-sensitive layer. A redox layer having a redox function is provided between the isolating membrane and the ion-sensitive layer to improve operating stability and speed of response. An electrically conductive layer or a combination of a thin metal film and an electrically conductive layer is provided between the isolating membrane and the redox layer to further improve operating stability, the adhesion of the layers and the durability of the sensor. Also disclosed are optimum materials for use as an ion carrier employed in the ion-sensitive layer.
-
Citations
59 Claims
-
1. An ion-sensitive FET sensor comprising:
-
a MOSFET having a gate portion; a redox layer containing at least one material capable of undergoing a quinone-hydroquinone type redox reaction covering a surface of an isolating membrane of the gate portion; and an ion-sensitive layer exhibiting ion selectivity covering a surface of said redox layer, wherein said ion-sensitive layer generates a potential corresponding to a concentration of an ion of interest and said redox layer generates an electric field on the gate portion of the MOSFET corresponding to the potential generated by the ion-sensitive layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. An ion-sensitive FET sensor comprising:
-
a MOSFET having a gate portion; a redox layer containing at least one material capable of undergoing an amine-quinoid type redox reaction covering a surface of an isolating membrane of the gate portion; and an ion-sensitive layer exhibiting ion selectivity covering the surface of said redox layer, wherein said ion-sensitive layer generates a potential corresponding to a concentration of an ion of interest and said redox layer generates an electric field on the gate portion of the MOSFET corresponding to the potential generated by the ion-sensitive layer. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
-
-
39. An ion-sensitive FET sensor comprising:
-
a MOSFET having a gate portion; a redox layer containing at least one member selected from the group consisting of poly(pyrrole) and poly(thionylene) covering a surface of an isolating membrane of the gate portion; and an ion-sensitive layer exhibiting ion selectivity covering a surface of said redox layer, wherein said ion-sensitive layer generates a potential corresponding to a concentration of an ion of interest and said redox layer generates an electric field on the gate portion of the MOSFET corresponding to the potential generated by the ion-sensitive layer. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
-
Specification