Reference electrode of insulated gate field effect transistor
First Claim
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1. A system for measuring chemical properties of substances in an electrolyte solution, comprising:
- a measuring unit comprising an insulated gate FET which selectively detects specific chemical substances;
a reference electrode comprising an insulated gate FET whose gate region is overlayed with a membrane, said membrane consisting of a hydrophobic organic polymeric membrane material that is impermeable to the electrolyte solution, free of an ionic dissociate group and insensitive to chemical properties of the solution;
a pseudo reference electrode formed of a good electrical conductor which applies bias to each FET transducer and fixes the electric potential of the electrolyte solution.
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Abstract
A reference electrode of an insulated gate field effect transistor having the surface of the gate region thereof coated with a hydrophobic organic polymer membrane. Since this reference electrode is much smaller in size than conventional reference electrodes, an integrated measurement system can easily be constructed by using this reference electrode. This measurement system is especially effective for measuring various ions in the living body.
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Citations
18 Claims
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1. A system for measuring chemical properties of substances in an electrolyte solution, comprising:
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a measuring unit comprising an insulated gate FET which selectively detects specific chemical substances; a reference electrode comprising an insulated gate FET whose gate region is overlayed with a membrane, said membrane consisting of a hydrophobic organic polymeric membrane material that is impermeable to the electrolyte solution, free of an ionic dissociate group and insensitive to chemical properties of the solution; a pseudo reference electrode formed of a good electrical conductor which applies bias to each FET transducer and fixes the electric potential of the electrolyte solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification