Materials and sensors for detecting gaseous agents
First Claim
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1. A sensor configured to detect a gaseous agent comprising:
- a transducer, wherein the transducer comprises an electrical resonant circuit that forms an antenna; and
a sensing material disposed at least on the portion of the transducer, wherein the sensing material comprises a tunable polymer additive configured to enable the sensing material to achieve an improved sensing performance, and wherein the sensing material is configured to simultaneously exhibit a capacitance response and a resistance response when exposed to a gaseous agent.
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Abstract
A sensor for detecting gaseous agents has a transducer, which includes an electrical resonant circuit that forms an antenna. The sensor further includes a sensing material that is disposed on at least a portion of the transducer. The sensing material is configured to simultaneously exhibit a capacitance response and a resistance response in the presence of a gaseous agent. The sensor may be reversible, battery free, and may require no electrical contact with a sensor reader.
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Citations
36 Claims
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1. A sensor configured to detect a gaseous agent comprising:
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a transducer, wherein the transducer comprises an electrical resonant circuit that forms an antenna; and a sensing material disposed at least on the portion of the transducer, wherein the sensing material comprises a tunable polymer additive configured to enable the sensing material to achieve an improved sensing performance, and wherein the sensing material is configured to simultaneously exhibit a capacitance response and a resistance response when exposed to a gaseous agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 31, 32, 33)
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14. A sensor configured to detect a gaseous agent, the sensor comprising:
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a transducer, wherein the transducer comprises an antenna; a sensing material disposed on the transducer, wherein the sensing material comprises a semiconducting metal oxide, a noble metal catalyst deposited on the semiconducting metal oxide, and a tunable polymer additive configured to enable the sensing material to achieve an improved sensing performance; and wherein the antenna is configured to emit an electric field to probe a response of the sensing material when exposed to a gaseous agent. - View Dependent Claims (15, 16, 17, 18, 24, 34, 35, 36)
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19. A method for preparing a sensor configured to detect a gaseous agent comprising:
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assembling a transducer by disposing an antenna on a substrate; doping a noble metal catalyst to a semiconducting metal oxide to form a metal oxide powder; mixing the metal oxide powder with an aqueous solution of a polymer matrix to form a stable metal oxide suspension; depositing the metal oxide suspension on the transducer; and drying the metal oxide suspension to form a sensing material, wherein the polymer matrix is configured to enable the sensing material to achieve an improved sensing performance. - View Dependent Claims (20, 21, 22, 23)
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25. A method for detecting a concentration of a gaseous agent comprising:
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exposing a sensing material to a gaseous agent, wherein the sensing material comprises a first component, a second component, and a tunable polymer additive, and wherein the first component, the second component, and the tunable polymer additive are deposited on a surface of a sensing coil, wherein the tunable polymer additive is configured to enable the sensing material to achieve an improved sensing performance; oxidizing or reducing the first component and/or the second component; measuring a capacitance response and a resistance response of the sensing material over a frequency range; and conducting analysis on the capacitance response and the resistance response of the sensing material to detect a concentration of the gaseous agent. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification