Compositions and methods for gas sample analysis
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Publication Number
US-11353419-B2
Publication Date
2022-06-07
Expiration Date
Abstract
A method of detecting acetone in a gas sample, comprising, at an operation temperature of 50° C. or less, exposing the gas sample to a gas sensor comprising an electrode and a sensing material deposited on the electrode, wherein the sensing material comprises tungsten bronze, and a level of the acetone in the gas sample is detected by a change in resistivity of the sensing material.
Core Innovation
A gas sensor includes an electrode and a sensing material deposited on the electrode. The sensing material comprises a tungsten bronze, a carbon complex of the tungsten bronze, or a complex of the tungsten bronze with reduced graphene oxide. The sensing material configuration is used to detect acetone in a gas sample based on a limit of detection at an operation temperature of 50°C or less.
The disclosure identifies tungsten bronze compositions for acetone sensing, including Na0.12K0.2WO3. It further describes carbon–tungsten bronze and reduced graphene oxide–tungsten bronze complexes as part of the sensing material, including rGO–MxWOy and specific examples such as (rGO)-Na0.1WO3, Na0.1WO3, Na0.15WO3, Cs0.33WO3, and Na0.12K0.2WO3. Acetone level is determined by a change in resistivity/resistance.
The problem addressed is acetone detection in a gas sample at low operation temperature with a limit of detection of 100 ppm or less. The disclosure also points to sensor design and integration options, including interdigitated electrodes, sensing material deposited as a film, and potential wearable/low-power device implementation for detecting acetone in breath or skin VOCs.
Claims Coverage
1 independent claim defines a low-temperature acetone gas sensor with a specific limit of detection and a defined sensing-material class. The dependent claims refine the acetone limit, specify electrode substrate options, narrow the sensing material to a film form, and extend the sensor into a self-calibrating wearable device with digital readout and size/power constraints.
Low-temperature acetone gas sensor with tungsten bronze-based sensing material
A gas sensor comprising an electrode and a sensing material deposited on the electrode, wherein the sensing material comprises a tungsten bronze, a carbon complex of the tungsten bronze, or a complex of the tungsten bronze with reduced graphene oxide, and the gas sensor has a limit of detection of 100 parts per million (ppm) or less of acetone in a gas sample at an operation temperature of 50°C or less, wherein the tungsten bronze is Na0.12K0.2WO3.
Lower acetone limit of detection at reduced operating temperature
The gas sensor has a limit of detection of 50 ppm or less.
Electrode substrate material selection
The gas sensor includes an electrode whose substrate is selected from ceramic, silica, silicon, glass, a printed circuit board (PCB), or a polyethylene terephthalate (PET) substrate.
Film-form sensing material
The gas sensor has a sensing material configured in the form of a film.
Compact wearable device size constraint
The wearable device has a volume of 5 cm3 or less.
Self-calibration and digital concentration readout for acetone
The wearable device is configured to calibrate itself and/or to digitally read concentration of acetone.
Across the independent claim and its refinements, the coverage centers on a low-temperature acetone gas sensor using tungsten bronze-based sensing materials, including carbon complex and reduced graphene oxide complexes, with a limit of detection of 100 ppm or less at 50°C or less. Dependent claims further tighten the acetone limit to 50 ppm or less, specify electrode substrate material options, require film-form sensing material, and describe a compact, self-calibrating wearable device with digital acetone concentration readout.
Stated Advantages
Provides acetone detection with a limit of detection of 100 ppm or less at an operation temperature of 50°C or less.
Provides acetone detection with a limit of detection of 50 ppm or less.
Enables sensor fabrication options via specified electrode substrate materials and a film-form sensing material.
Enables a wearable device form factor with self-calibration and digital readout of acetone concentration.
Documented Applications
Acetone detection in a gas sample, including use in breath sample/skin VOC contexts as described in the disclosure.
Wearable use for acetone detection with self-calibration and/or digital readout of acetone concentration.
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