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Optimized capacitive sensor for chemical analysis and measurement

  • US 4,822,566 A
  • Filed: 05/18/1987
  • Issued: 04/18/1989
  • Est. Priority Date: 11/19/1985
  • Status: Expired due to Term
First Claim
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1. A device for detecting the presence of an analyte in a fluid having an aqueous solvent, said device comprising:

  • a sensing capacitor including;

    a substrate having a first conductor and a second conductor spaced a distance from said first conductor,an electrically insulating layer covering said first and second conductors, said electrically insulating layer defining a surface,a binding agent selected from the group consisting of antigens, haptens, bioreceptors and antibodies capable of biospecifically binding with the analyte,a linking molecule adapted for and covalently bonding said binding agent to said surface and extending said binding agent a distance from said surface to minimize steric hindrance between the analyte and the surface; and

    ,a circuit means, electrically coupled to said sensing capacitor, responsive to changes in capacitance between said first and second conductors.

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