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pH and CO.sub.2 sensing device and method of making the same

  • US 4,536,274 A
  • Filed: 04/18/1983
  • Issued: 08/20/1985
  • Est. Priority Date: 04/18/1983
  • Status: Expired due to Fees
First Claim
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1. A CO2 gas sensor comprising:

  • an electrically nonconductive substrate;

    a metal/metal oxide junction type active electrode including an active electrode metal, the active electrode metal being applied to the substrate by one of thick film and thin film techniques, and the active metal being then subjected to electro-oxidizing conditions for a period of time sufficient to oxidize a portion of the applied active electrode metal, the applied active electrode metal being made cathodic prior to discontinuance of the electro-oxidizing conditions;

    a silver/silver halide junction type reference electrode, adheringly applied to the substrate;

    an insulating, dielectric coating applied over at least portions of the substrate and electrodes;

    and a polymeric membrane comprising a laminate of a hydrophobic polymeric material atop a hydrophilic membrane material applied over at least those portions of the electrodes not having the insulating dielectric coating applied thereto, the polymeric membrane being capable of relatively rapidly transmitting CO2 thereacross, and the polymeric material including a liquid electrolyte bound by the polymeric membrane.

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