Extended use planar sensors

Details Extended use planar sensors Extended use planar sensors

1997-08-25

2000-05-30

Zitomer, Fred

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204296, 204415, 204418, 204424, 204431, 521 27, 526297, 5263077, 526310, 526319, 526342, G01N 2740

Patent

active

060687487

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 .mu.l. 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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