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US 10,502,705 B2Granted
Resonant gas sensor
AssigneeLyten, Inc.
InventorsMichael W. Stowell, Bruce Lanning, Sung H. Lim, Shreeyukta Singh, John Chmiola
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Abstract
A method for detecting an analyte comprises providing a first carbon-based material comprising reactive chemistry additives, providing conductive electrodes connected to the first carbon-based material, exposing the first carbon-based material to an analyte, applying a plurality of alternating currents having a range of frequencies across the conductive electrodes, and measuring the complex impedance of the first carbon-based material using the plurality of alternating currents.
Claims20
A method for detecting an analyte, comprising:
- providing a first carbon-based material comprising reactive chemistry additives;
- providing conductive electrodes connected to the first carbon-based material;
- exposing the first carbon-based material to the analyte;
- applying a plurality of alternating currents having a range of frequencies across the conductive electrodes;
- and
- measuring a complex impedance of the first carbon-based material using the plurality of alternating currents;
- wherein:
- the providing the first carbon-based material comprises using a microwave plasma to produce carbon particles, and printing the carbon particles to form the first carbon-based material;
- and
- the reactive chemistry additives are tuned to the analyte.
7 more elements
A sensor for detecting an analyte, comprising:
- a flexible substrate;
- a resonant gas sensor circuit, comprising:
- a transducer arranged on the flexible substrate;
- a sensing material arranged on the flexible substrate and electrically coupled to the transducer, wherein the sensing material comprises a first particulate carbon and a reactive chemistry additive;
- and
- a ground electrode electrically coupled to a first terminal of the transducer;
- and
- a microprocessor arranged on the flexible substrate and electrically coupled to a second terminal of the transducer and to the ground electrode, the microprocessor comprising:
- an alternating current (AC) source configured to supply a plurality of AC signals to the first terminal of the transducer, the plurality of AC signals comprising a range of frequencies;
- and
- a detection circuit that measures a plurality of AC signals reflected from the first terminal of the transducer;
- wherein the first particulate carbon in the sensing material comprises:
- a plurality of carbon aggregates each comprising a plurality of carbon nanoparticles, each carbon nanoparticle comprising graphene;
- the graphene in the plurality of carbon nanoparticles comprises up to 15 layers;
- a percentage of carbon to other elements, except hydrogen, in the carbon aggregates is greater than 99%;
- a median size of the carbon aggregates comprising the carbon nanoparticles is from 0.1 microns to 50 microns;
- a surface area of the carbon aggregates is from 10 m2/g to 300 m2/g, when measured via a Brunauer-Emmett-Teller (BET) method with nitrogen as the adsorbate;
- and
- the carbon aggregates, when compressed, have an electrical conductivity from 500 S/m to 20,000 S/m.
16 more elements
Dependencies are inferred from the claim text.