Lithium ion sensor

• US 5,192,417 A
• Filed: 10/05/1990
• Issued: 03/09/1993
• Est. Priority Date: 09/21/1987
• Status: Expired due to Fees

• Current Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Original Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Inventors: Shono, Toshiyuki, Oyama, Noboru
• Primary Examiner(s): Niebling, John
• Assistant Examiner(s): Leader, William T.
• Application Number:
  US07/593,520
• Time in Patent Office: 886 Days
• Field of Search: 204/153.15, 204/418, 357/25, 128/635
• US Class Current: 204/418
• CPC Class Codes: G01N 27/414 Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS

Abstract

A lithium ion sensor includes a FET, a redox layer having a redox function covering a gate isolating membrance of the FET, and a lithium ion-sensitive layer selectively sensing lithium ion covering the redox layer.

Claims

1. A lithium ion sensor comprising:

a FET;

a redox layer having a redox function covering a gate isolating membrane of said FET wherein said redox layer is obtained by electrolytically polymerizing a p-p'"'"'biphenol; and

a lithium ion-sensitive layer for selectively sensing lithium ion covering said redox layer, said lithium ion-sensitive layer being a polyvinyl chloride layer containing dibenzyl-14-crown-4, a derivative of dibenzyl-14-crown-4 or a mixture thereof, dioxaheptyl-dodecyl-14-crown-4, a derivative of dioxaheptyl-dodecyl-14-crown-4 or a mixture thereof, or diethoxyphosphorioxyethyl-dodecyl-14-crown-4, a derivative of diethoxyphosphorioxyethyl-dodecyl-14-crown-4 or a mixture thereof.

2. The lithium ion sensor according to claim 1, wherein said FET is a MOSFET.

3. A lithium ion sensor comprising:

an electrically conductive substrate having an electrically conductive carbon layer on a surface thereof;

a redox layer having a redox function covering a surface of said electrically conductive carbon layer wherein said redox layer is obtained by electrolytically polymerizing a p-p'"'"'biphenol; and

a lithium ion-sensitive layer for selectively sensing lithium ion covering said redox layer, said lithium ion-sensitive layer being a polyvinyl chloride layer containing dibenzyl-14-crown-4, a derivative of dibenzyl-14-crown-4 or a mixture thereof, dioxaheptyl-dodecyl-14-crown-4, a derivative of dioxaheptyl-dodecyl-14-crown-4 or a mixture thereof, or diethoxyphosphorioxyethyl-dodecyl-14-crown-4, a derivative of diethoxyphosphorioxyethyl-dodecyl-14-crown-4 or a mixture thereof.

4. A lithium ion sensor comprising:

a FET;

a redox layer having a redox function covering a gate isolating member of said FET wherein said redox layer is obtained by electrolytically polymerizing a p-p'"'"'biphenol, and

a lithium ion-sensitive layer for selectively sensing lithium ion covering acid redox layer, said lithium ion-sensitive layer containing 1,1 parts by weight of dibenzyl-14-crown-4, a derivative of dibenzyl-14-crown-4 or a mixture thereof, dioxaheptyldodecyl-14-crown-4, a derivative of dioxaheptyl-dodecyl-14-crown-4 or a mixture thereof, or diethoxyphosphorioxyethyl-dodecyl-14-crown-4, a derivative of diethoxyphosphorioxyethyl-dodecyl-14-crown-4 or a mixture thereof, 70.2 parts by weight o-nitrophenyloctylether, 0.7 parts by weight potassium tetrakis(p-chlorophenyl)borate, 28.0 parts by weight polyvinyl chloride and 3 ml solvent.

5. The lithium ion sensor according to claim 4, wherein said FET is a MOSFET.

6. A lithium ion sensor comprising:

an electrically conductive substrate having an electrically conductive carbon layer on a surface thereof;

a redox layer having a redox function covering a surface of said electrically conductive carbon layer wherein said redox layer is obtained by electrolytically polymerizing a p-p'"'"'biphenol; and

a lithium ion-sensitive layer for selectively sensing lithium ion covering said redox layer, said lithium ion-sensitive layer containing 1.1 parts by weight dibenzyl-14-crown-4, a derivative of dibenzyl-14-crown-4 or a mixture thereof, dioxaheptyl-dodecyl-14-crown-4, a derivative of dioxaheptyl-dodecyl-14-crown-4 or a mixture thereof, or diethoxyphosphorioxyethyl-dodecyl-14-crown-4, a derivative of diethoxyphosphorioxyethyl-dodecyl-14-crown-4 or a mixture thereof, 70.2 parts by weight o-nitrophenyloctylether, 0.7 parts by weight potassium tetrakis(p-chlorophenyl)borate, 28.0 parts by weight polyvinyl chloride and 3 ml solvent.