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Chemical sensing apparatus and methods

  • US 6,808,618 B2
  • Filed: 07/25/2001
  • Issued: 10/26/2004
  • Est. Priority Date: 07/25/2001
  • Status: Expired due to Term
First Claim
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1. Amperometric sensing apparatus for detecting an analyte in a gaseous medium, winch comprises:

  • a working electrode at which said analyte is caused to participate in an analyte half-cell reaction;

    a reference electrode for controlling the electrochemical potential of said working electrode;

    a counter electrode at which a complementary half-cell reaction is caused to occur, wherein all three electrodes are electrochemically connected through an electrolyte and said counter and reference electrodes may be combined into a single electrode;

    means of enhancing the reactivity of the counter electrode to the product of the analyte reaction; and

    means for reconverting the product of the analyte reaction back to the analyte and then reacting it again at the working electrode, with such back-and-forth reactions repeating many times, so as to yield an amplification of the analyte signal.

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