ELECTROCHEMICAL SENSOR WITH DRY IONOMER MEMBRANE
First Claim
1. A sensor cell for detecting gas comprising:
- a substrate;
a sensing electrode in close proximity with said substrate for detecting gas;
a dry ionomer membrane in contact with said substrate and said sensing electrode wherein said dry ionomer membrane acts as an electrolyte;
at least one opening in said substrate for keeping gas in contact with both said dry ionomer membrane and said sensing electrode
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Accused Products
Abstract
A miniaturized gas sensor comprised of film type electrodes, on a non-conductive supportive substrate, and in contact with a dry ionomer electrolyte, for detection of toxic gases, i.e., carbon monoxide, and other oxidizable or reducible gases and vapors and method of making same is described. The all-solid planar sensor cell has two or more film type electrodes arranged on a non-conductive planar surface of a supportive substrate. Manufacturing the electrochemical sensor with dry ionomer prevents electrode flooding and allows for improved response time upon assembly. The sensor cell contains no liquid electrolyte and is operated in a constant-voltage, potentiostatic or potentiodynamic mode. A high sensitivity to a select gas or vapor is achieved by a three-phase contact area design for a sensing electrode, which provides contact with the solid ionomer electrolyte, as well as the gas sample via diffusion openings or holes that penetrate through the supportive substrate.
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Citations
29 Claims
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1. A sensor cell for detecting gas comprising:
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a substrate; a sensing electrode in close proximity with said substrate for detecting gas; a dry ionomer membrane in contact with said substrate and said sensing electrode wherein said dry ionomer membrane acts as an electrolyte; at least one opening in said substrate for keeping gas in contact with both said dry ionomer membrane and said sensing electrode - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of making an electrochemical sensor for the detection of an analyte in a gas sample comprising:
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providing a dry ionomer membrane; providing a substrate that has holes through its surface and an electrode layer adjacent to said holes; punching holes in said dry ionomer membrane; and mating said dry ionomer membrane to said substrate such that the holes in said dry ionomer membrane align with the holes in said substrate forming a gas inlet and wherein said dry ionomer membrane has on its surface an electrode layer in operative connection with said ionomer membrane which reacts with a gas to produce mobile electrons. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A method of making an electrochemical sensor for the detection of an analyte in a gas sample comprising:
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a) providing a dry ionomer membrane free from liquid droplets; b) providing a substrate with at least one opening through its surface and a first electrode layer adjacent to said opening; c) connecting said dry ionomer membrane to said substrate; d) aligning said at least one opening in said substrate with the first electrode for defining a gas passage; and e) depositing a second electrode on said substrate for operatively connecting said ionomer membrane, said first electrode, and said second electrode.
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Specification