Extended use planar sensors
First Claim
1. A membrane suitable for use with a planar oxygen sensor comprising the polymerization product of:
- at least one monomer having the formula CH2 ═
C(R1)(COOR2), where R1 and R2 are each selected from the group consisting of hydrogen, hydrocarbon groups, and alcohol groups and R1 and R2 can be the same or different;
at least one monomer selected from the group consisting of those having the formulas CH2 ═
C(R1)(CONR2 R3), CH2 ═
C(R1)(OCOR2), where R1, R2, and R3 are each selected from the group consisting of hydrogen, hydrocarbon groups, and alcohol groups and R1, R2, and R3 can be the same or different; and
at least one nitrile-containing monomer,wherein the composition is constructed and arranged as a membrane, suitable for use with an electrochemical planar oxygen sensor for separating electrodes from a sample, and having impermeability to liquid water, but rapid permeability to water vapor.
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Abstract
A planar, solid-state electrochemical oxygen sensor having a substrate, conductive strips deposited on the substrate, and a dielectric layer insulating portions of the conductive strips except those portions which define a working electrode and at least one second electrode. The working electrode may be defined by an open printed region of the dielectric, or by a needle-punched or laser-burned hole or opening in the dielectric which exposes a small region of one of the conduct strips. A solid electrolyte contacting the electrodes is covered by a semipermeable membrane which may comprise an acrylonitrile butadiene copolymer or an acrylate-based copolymer. A sample chamber is defined by the membrane, a cover member, and a gasket therebetween, and has a volume of from about 1 to about 2 μl. The gasket is formulated from the highly cross-linked polymerization product of epichlorohydrin. All sensor components are selected such that a sensor operable for at least 2 days under normal conditions is produced.
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Citations
16 Claims
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1. A membrane suitable for use with a planar oxygen sensor comprising the polymerization product of:
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at least one monomer having the formula CH2 ═
C(R1)(COOR2), where R1 and R2 are each selected from the group consisting of hydrogen, hydrocarbon groups, and alcohol groups and R1 and R2 can be the same or different;at least one monomer selected from the group consisting of those having the formulas CH2 ═
C(R1)(CONR2 R3), CH2 ═
C(R1)(OCOR2), where R1, R2, and R3 are each selected from the group consisting of hydrogen, hydrocarbon groups, and alcohol groups and R1, R2, and R3 can be the same or different; andat least one nitrile-containing monomer, wherein the composition is constructed and arranged as a membrane, suitable for use with an electrochemical planar oxygen sensor for separating electrodes from a sample, and having impermeability to liquid water, but rapid permeability to water vapor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification