Metal salt hydrogen sulfide sensor
OwnerBruce H. Weiller, Richard B. Kaner +1inventors
InventorsBruce H. Weiller, Richard B. Kaner, Shabnam Virji
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Abstract
A hydrogen sulfide sensor is made from a metal acetate film, such as a thin film of copper acetate, formed on a set of monitoring electrodes, by evaporation of a metal acetate aqueous solution disposed on the electrodes, for detecting a weak gas, such as hydrogen sulfide, carried in a gas carrier, such as a nitrogen carrier, for detecting low concentration of the weak gas, such as ten ppm, when the conductivity of the film changes by several orders of magnitude, that produces a metal sulfide, such as copper sulfide, that is a good electrical conductor at room temperature, for example, as the metal acetate is converted directly to a metal sulfide upon exposure to hydrogen sulfide.
Claims20
A sensor for detecting a weak acid, the sensor comprising,
- a substrate,
- a pair of electrodes on said substrate, and a metal salt in contact with the pair of electrodes,
- wherein an electrical characteristic of the metal salt changes when the metal salt is exposed to a weak acid,
- said change in electrical characteristic being sufficient for display by an external monitor.
A method of forming a sensor for detecting the presence of a weak acid comprising the steps of,
- disposing a pair of electrodes on a substrate, forming a metal salt solution,
- placing sufficient metal salt solution on the substrate in contact with each of the pair of electrodes, and
- evaporating the metal salt solution on the electrodes using dried air.
A method for forming a sensor for detecting the presence of a weak acid comprising the steps of,
- disposing a pair of electrodes on a substrate,
- forming a metal salt solution,
- placing sufficient metal salt solution on the substrate in contact with each of the pair of electrodes, and
- evaporating the metal salt solution on the electrodes using heated oven air.
A sensor for detecting hydrogen sulfide, the sensor comprising,
- a substrate,
- a pair of electrodes on said substrate,
- a metal salt in contact with the the pair of electrodes, the metal salt comprising copper sulfate
- wherein the electrical resistance of the copper sulfate changes when exposed to hydrogen sulfide
- said change in electrical resistance being sufficient for display by an external monitor.
A method of forming an electrode for detecting hydrogen sulfide comprising the steps of,
- disposing a pair of electrodes on a substrate
- forming a copper acetate solution,
- placing sufficient copper acetate solution on the substrate in contact with each of the pair of electrodes, and
- evaporating the copper acetate solution on the electrodes.
Dependencies are inferred from the claim text.