CN114487032A - Gas sensing element and detection system - Google Patents

Gas sensing element and detection system Download PDF

Info

Publication number
CN114487032A
CN114487032A CN202011155607.9A CN202011155607A CN114487032A CN 114487032 A CN114487032 A CN 114487032A CN 202011155607 A CN202011155607 A CN 202011155607A CN 114487032 A CN114487032 A CN 114487032A
Authority
CN
China
Prior art keywords
gas
sensing element
cavity
gas sensing
carbon dioxide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011155607.9A
Other languages
Chinese (zh)
Inventor
戴念华
李紫原
张敬
林正杰
彭殿王
萧逸函
苏刚正
柯信国
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202011155607.9A priority Critical patent/CN114487032A/en
Publication of CN114487032A publication Critical patent/CN114487032A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/125—Composition of the body, e.g. the composition of its sensitive layer
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A61B5/082—Evaluation by breath analysis, e.g. determination of the chemical composition of exhaled breath
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—Specially adapted to detect a particular component
    • G01N33/004—Specially adapted to detect a particular component for CO, CO2

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Biophysics (AREA)
  • Surgery (AREA)
  • Pulmonology (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Physiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Combustion & Propulsion (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

The invention relates to a gas sensing element and a detection system. The invention provides a gas sensing element for detecting the concentration of carbon dioxide in gas, which comprises a substrate, a conductive unit and a sensing layer. The conductive unit is arranged on the substrate and comprises two electrodes, and the sensing layer comprises polyethyleneimine and polyethylene glycol and is arranged on the conductive unit and electrically connected with the electrodes. The sensitivity of the sensing layer to carbon dioxide measurement is improved by the addition of polyethylene glycol. In addition, the invention also provides a detection system, which comprises the gas sensing element, a testing device and an analysis device, wherein the testing device comprises a cavity, a gas inlet for introducing gas and a connecting seat arranged in the cavity and electrically connected with the outside, and the gas sensing element can be electrically connected with the analysis device through the connecting seat to the outside so as to provide a non-invasive and convenient detection mode.

Description

Gas sensing element and detection system
Technical Field
The present invention relates to a gas sensor and a detection system, and more particularly, to a gas sensor and a detection system for detecting carbon dioxide concentration.
Background
Chronic Obstructive Pulmonary Disease (COPD) is one of the common Chronic diseases, and is generally caused by long-term smoking or air pollution, which causes the respiratory tract of a patient to be inflamed for a long time, leads to respiratory tract obstruction, and leads to the patient to be unable to inhale and exhale smoothly, and in addition, patients with COPD contain carbon dioxide in the exhaled breath at a concentration different from that of normal people.
In clinical medicine, methods for detecting chronic obstructive pulmonary disease have been proposed, and common methods are, for example, a radial artery puncture method for collecting arterial blood of a patient, which causes great pain to the patient compared with a general venous blood collection method; another common detection method is performed by a carbon dioxide physiological monitor (Capnography), but this detection method needs to be performed by the patient under the condition of intubation, otherwise, the measured result is affected by carbon dioxide in the atmosphere to cause errors. Both of the above-mentioned detection methods are invasive and therefore easily cause pain and discomfort to the patient. In addition, the detection process is performed by professional medical staff, so the detection cost is very high.
Therefore, how to develop a non-invasive and more convenient method for detecting CO contained in the expired air of COPD patients2Concentration, is one of the important research points in the related field.
Disclosure of Invention
The invention aims to provide a gas sensing element for sensing the concentration of carbon dioxide in a gas to be detected.
The gas sensor of the present invention comprises: the sensor includes a substrate, a conductive unit, and a sensing layer.
The conductive unit is arranged on the substrate and comprises two electrodes which are used for being connected with the outside.
The sensing layer is used for adsorbing carbon dioxide gas, is arranged on the conductive unit and is electrically connected with the electrodes, and comprises polyethyleneimine and polyethylene glycol.
Preferably, the weight ratio of the polyethyleneimine to the polyethylene glycol is between 1:0.03 and 1: 1.
Preferably, in the gas sensing device of the present invention, the sensing layer further includes at least one of polypyrrole and polyaniline.
Preferably, the gas sensing device of the present invention further includes an insulating layer disposed on the electrodes and exposing opposite ends of the electrodes.
Preferably, the gas sensing element of the present invention further includes a conductive layer made of a conductive material, the conductive layer is disposed on one end of the electrodes on the same side and electrically connected to the electrodes, and the sensing layer is disposed on the conductive layer.
Preferably, in the gas sensing device of the present invention, the conductive layer may be selected from conductive polymer, graphene, reduced graphene oxide, or carbon nanotubes.
Preferably, the gas sensing element of the present invention, wherein the electrodes are selected from carbon electrodes.
It is still another object of the present invention to provide a detection system having the gas sensor device as described above.
The detection system of the present invention is suitable for detecting the concentration of carbon dioxide contained in a gas to be detected, and includes: the gas sensing element, the testing device, and the analyzing device as described above.
The gas sensing element absorbs carbon dioxide in the gas to be detected through the sensing layer.
The testing device comprises a housing, a cavity formed in the housing and used for accommodating the gas sensing element, a gas inlet arranged in the housing and communicated with the cavity and used for introducing the gas to be tested into the cavity, and an electric connecting seat arranged in the cavity and electrically connected with the outside, wherein the gas sensing element can be detachably and electrically connected to the electric connecting seat and electrically connected with the outside through the electric connecting seat.
The analysis device is electrically connected with the electric connection seat and is used for detecting the electric state of the gas sensing element after the gas sensing element absorbs carbon dioxide.
Preferably, the detection system of the present invention further includes an air extractor disposed in the housing and communicated with the cavity, wherein the air extractor is configured to extract air from the cavity.
Preferably, the testing device further includes a filtering air inlet member disposed at a side of the casing and communicating with the cavity, for filtering and introducing external air into the cavity.
The invention has the beneficial effects that: the sensing layer is selected from the combination of polyethyleneimine and polyethylene glycol, and the characteristic that the polyethylene glycol absorbs moisture from the gas to be detected is utilized to effectively improve the reaction rate of the polyethyleneimine in adsorbing carbon dioxide, so that the sensing sensitivity of the sensing layer on the carbon dioxide is improved. In addition, the detection system can provide a non-invasive detection mode for a user, the gas sensing element can be detachably and electrically connected to the electric connection seat, and then the gas to be detected is led into the test device through the gas inlet, so that the concentration of carbon dioxide in the gas to be detected can be automatically detected, the use is easy, and pain in the detection process can be avoided.
Drawings
FIG. 1 is a schematic perspective view illustrating one embodiment of a gas sensing device according to the present invention;
FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1 illustrating the structure of the gas sensing element;
FIG. 3 is a schematic diagram illustrating one embodiment of a detection system of the present invention;
FIG. 4 is a perspective view illustrating a testing device of the inspection system;
FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4 illustrating the chamber of the testing device and the gas sensing element disposed on the electrical connection socket; and
FIG. 6 is a graph of current versus time illustrating the results of an experiment in which the detection system measures the concentration of carbon dioxide in the gas under test.
Detailed Description
The invention is described in detail below with reference to the figures and examples, wherein like reference numbers indicate functionally identical or similar elements. Before the present invention is described in detail, it should be noted that the drawings are for illustrative purposes only and are not drawn to scale, and are not intended to represent actual dimensions or actual relative dimensions of the components described below.
Referring to fig. 1 and 2, an embodiment of a gas sensor 100 of the present invention includes a substrate 1, a conductive unit 2, a sensing layer 3, and an insulating layer 4.
The substrate 1 suitable for the present embodiment is made of an insulating material, and may be selected from a glass, a silicon wafer, or a plastic substrate, but not limited thereto.
The conductive unit 2 is disposed on the substrate 1 and includes two electrodes 21 for external connection and a conductive layer 22 disposed on the electrodes 21 and electrically connected to the electrodes 21. The electrodes 21 may be selected from carbon electrodes and are formed on the substrate 1 by printing.
In the present embodiment, the electrodes 21 are disposed on the substrate 1 in a strip shape and in parallel at intervals, and the insulating layer 4 is disposed on the electrodes 21 by means of pasting or coating, so as to provide protection to prevent the electrodes 21 from falling off the substrate 1 during use, and expose opposite ends of the electrodes 21 in a strip shape.
The conductive layer 22 is disposed on the same side and exposed end of the electrodes 21, and forms a conductive path with the electrodes 21, and the other end of the electrodes 21 opposite to the exposed end of the conductive layer 22 is used for external electrical connection.
The conductive layer 22 is selected from a conductive material, such as a conductive polymer, graphene, reduced graphene oxide (rGO), or carbon nanotubes. In the embodiment, the conductive layer 22 is selected from carbon nanotubes with a good specific surface area, and the conductive layer 22 is mainly fabricated by uniformly dispersing the carbon nanotubes in isopropanol as a solvent, and then forming the solution on the electrodes 21 by spraying, dropping coating (or screen printing).
The sensing layer 3 is disposed on the conductive layer 22 and electrically connected to the electrodes 21 through the conductive layer 22. The sensing layer 3 includes Polyethyleneimine (Polyethyleneimine) and Polyethylene glycol (PEG), wherein the weight ratio of the Polyethyleneimine to the PEG is between 1:0.03 and 1: 1. Preferably, the weight ratio of polyethyleneimine to polyethylene glycol is 1:0.1, and the polyethyleneimine is selected from polyethyleneimine with a branched structure, which has more amine groups for capturing carbon dioxide than polyethyleneimine with a linear structure. In this embodiment, after dissolving the polyethyleneimine and polyethylene glycol with branched structure which are liquid at room temperature in isopropanol, the solution is fully mixed and then formed on the conductive layer 22 by spraying, and then the isopropanol is removed to obtain the conductive layer. In addition, a thermal treatment process may be further performed on the formed sensing layer 3 to remove the remaining micro-bubbles between the sensing layer 3 and the conductive layer 2, so as to improve the adhesion of the sensing layer 3, and increase the current conduction path between the sensing layer 3 and the conductive layer 2, thereby improving the current conduction efficiency.
In some embodiments, the sensing layer 3 may further include at least one of Polypyrrole (PPy) and Polyaniline (PANI), which can capture carbon dioxide in the gas by its own amine group.
Specifically, the polyethyleneimine of the sensing layer 3 adsorbs carbon dioxide in the contacted gas through its own Amine group (Amine group), and at the same time, the Amine group also adsorbs moisture from the air, and the reaction formula of the polyethyleneimine adsorbing carbon dioxide and moisture is: r2NH+CO2+H2O→R2NH2 ++HCO3 -. The polyethylene glycol of the sensing layer 3 can capture more water vapor from the gas to be detected through the hydroxyl of the polyethylene glycol, and based on the Lexatese principle, when the water vapor captured by the sensing layer 3 is increased, the reaction rate of the amine of the polyethyleneimine for absorbing carbon dioxide can be increased, so that the sensing is increasedLayer 3 detects the sensitivity of carbon dioxide in the gas to be measured. Therefore, the signal sensing strength of the polyethyleneimine to the carbon dioxide is improved by adding the polyethylene glycol, so that the sensitivity of the sensing layer 3 for detecting the carbon dioxide is improved.
Referring to fig. 3 to 5, the gas sensor device 100 of the present embodiment can be applied to a detection system for detecting the concentration of carbon dioxide in a gas to be detected. The detection system comprises a testing device 5, the gas sensing element 100 disposed in the testing device 5, an air extracting device (not shown) communicated with the testing device 5 and disposed in the housing 51, and an analyzing device 6 connected with the gas sensing element 100.
The testing device 5 includes a housing 51, a cavity 52, an air inlet 53, an electrical connection socket 54, a filtering air inlet 55, and an air outlet 58.
The housing 51 has a bottom wall 521, a surrounding wall 522 extending upward from the bottom wall 521 to an upper surface of the housing 51, and an upper cover 523 capable of being sealed to a side of the surrounding wall 522 away from the bottom wall 521, wherein the bottom wall 521, the surrounding wall 522, and the upper cover 523 together define the cavity 52 for accommodating the gas sensor 100.
The air inlet 53 and the air outlet 58 are disposed on the housing 51 and are respectively connected to the cavity 52. The gas inlet 53 allows the gas to be measured to be introduced into the cavity 52, and the gas in the cavity 52 can be discharged out of the housing 51 through the gas outlet 58.
The electrical connection seat 54 is disposed on the bottom wall 521 of the cavity 52, and is electrically connected to the outside, and has a slot for the gas sensing device 100 to be detachably inserted, so that the gas sensing device 100 can be electrically connected to the outside through the electrical connection seat 54.
The filtering air inlet 55 is disposed at a side of the housing 51, and is communicated with the cavity 52, for filtering external air and guiding the filtered air into the cavity 52.
In this embodiment, the testing device 5 is further provided with a flow meter 56 adjacent to the inlet 53, and a pressure gauge 57. The flow meter 56 is used for measuring the gas flow of the gas to be measured flowing through the gas inlet 53, and the pressure gauge 57 is used for measuring the pressure inside the cavity 52. However, in practice, the flow meter 56 and the pressure meter 57 may be selectively set according to the requirement, or need not be set.
The analysis device 6 is electrically connected to the electrical connection socket 54 and is connected to the electrodes 21 of the gas sensor 100 through the electrical connection socket 54 for detecting the electrical state of the gas sensor 100 after adsorbing carbon dioxide.
The air-extracting device is disposed in the housing 51 and is communicated with the cavity 52 for extracting the air in the cavity 52.
When the detection system is used to detect the carbon dioxide concentration of the gas to be detected, the gas sensing element 100 is inserted into the slot of the electrical connection seat 54 by the end portions of the electrodes 21 exposed outside the insulating layer 4 and far away from the sensing layer 3, and is electrically connected to the outside through the electrical connection seat 54, and the upper cover 523 is covered to close the inside of the cavity 52.
Then, pumping out the gas in the chamber 52 by the pumping device to reduce the pressure inside the chamber 52 to 650mmHg to 700 mmHg; the filtering air intake part 55 is activated to make the air outside the housing 51 be led into the cavity 52 through the filtering air intake part 55 due to the pressure difference between the outside and the inside of the cavity 52, and make the air remove the solid particles and moisture therein while flowing through the filtering air intake part 55, at this time, the analysis device 6 can be used to measure the electrical state of the gas sensing element 100, so as to obtain the background signal.
Finally, the gas to be detected is introduced into the cavity 52 through the gas inlet 53, and at the same time, a portion of the gas in the cavity 52 is discharged from the gas outlet 58 to stabilize the pressure inside the cavity 52, at this time, the gas sensing element 100 adsorbs carbon dioxide in the gas to be detected through the sensing layer 3 to generate a resistance change, and the analysis device 6 can receive the resistance change of the gas sensing element 100 through the electrical connection seat 54 to obtain a detection signal. The analysis device 6 analyzes the detection signal with the background signal as a reference value to obtain the carbon dioxide concentration in the gas to be detected.
In detail, when the sensing layer 3 adsorbs/desorbs carbon dioxide in the gas to be detected, the charge density of the sensing layer 3 itself changes, and the resistance value changes. The conductive layer 22 formed by carbon nanotubes has a high specific surface area and a plurality of conductive paths, so that the conductive layer 22 can efficiently transmit the detection signal to the analysis device 6 when the electrical state of the sensing layer 3 changes.
Referring to fig. 6, in the specific implementation of the present embodiment, the gas sensing element 100 is exemplified by a combination of the sensing layer 3 and the polyethyleneimine to polyethylene glycol in a weight ratio of 1:0.1, and the current measurement diagram shown in fig. 6 is obtained by measuring the gas to be detected with different carbon dioxide concentrations through the detection system of the present invention, in which after the gas sensing element 100 is inserted into the electrical connection seat 54, a fixed voltage is provided from the outside through the electrical connection seat 54, then the gas to be detected with carbon dioxide with different concentrations is continuously introduced into the cavity 52 through the gas inlet 53, and the current value change of the gas sensing element 100 when the gas to be detected with different carbon dioxide concentrations is sensed is read through the analysis device 6, so as to obtain the experimental result shown in fig. 6. By measuring the gas to be measured with different carbon dioxide concentrations (the embodiment is described by taking the measurement concentration range between 2% and 15% as an example), the gas sensing element 100 of the present invention has good sensitivity to carbon dioxide, and can obtain significantly different signal intensities under different carbon dioxide concentrations, and in addition, the stability of the gas sensing element 100 can be verified from this continuous cycle test.
In summary, the sensing layer 3 of the gas sensing device 100 of the present invention is selected from a combination of polyethyleneimine and polyethylene glycol, so as to improve the sensitivity of measuring carbon dioxide when detecting the gas to be measured, and the addition of polyethylene glycol can effectively capture moisture from the gas to be measured, thereby improving the reaction rate of polyethyleneimine adsorbing carbon dioxide, and further enhancing the signal intensity of carbon dioxide measured by the sensing layer 3. In addition, the detection system can provide a non-invasive detection method for the user, so long as the gas to be detected (such as the gas exhaled by the COPD patient) is introduced into the testing device 5 through the gas inlet 53, the carbon dioxide concentration in the gas to be detected can be automatically detected without the assistance of professionals, the detection method is simple and convenient, and the pain of the patient is avoided in the process, so the aim of the invention can be really achieved.

Claims (10)

1. A gas sensing element, characterized by: comprises the following steps:
a substrate;
the conductive unit is arranged on the substrate and comprises two electrodes which are used for being connected with the outside; and
the sensing layer is used for adsorbing carbon dioxide gas, is arranged on the conductive unit and is electrically connected with the electrode, and comprises polyethyleneimine and polyethylene glycol.
2. The gas sensing element of claim 1, wherein: the weight ratio of polyethyleneimine to polyethylene glycol is between 1:0.03 and 1: 1.
3. The gas sensing element of claim 1, wherein: the sensing layer further comprises at least one of polypyrrole and polyaniline.
4. The gas sensing element of claim 1, wherein: the electrode structure also comprises an insulating layer which is arranged on the electrode and exposes two opposite ends of the electrode.
5. The gas sensing element of claim 4, wherein: the conductive unit further includes a conductive layer made of a conductive material, disposed on one end of the electrodes on the same side to be electrically connected to the electrodes, and the sensing layer is disposed on the conductive layer.
6. The gas sensing element of claim 5, wherein: the conductive layer may be selected from conductive polymers, graphene, reduced graphene oxide, or carbon nanotubes.
7. The gas sensing element of claim 1, wherein: the electrode is selected from carbon electrodes.
8. The utility model provides a detecting system, is applicable to the carbon dioxide concentration who contains in the gas that detects, its characterized in that: comprises the following steps:
the gas sensing element according to any one of claims 1 to 7, adsorbing carbon dioxide in the gas to be measured by the sensing layer;
the testing device comprises a housing, a cavity which is formed in the housing and can accommodate the gas sensing element, a gas inlet which is arranged on the housing and communicated with the cavity and is used for leading the gas to be tested into the cavity, and an electric connecting seat which is arranged in the cavity and is electrically connected with the outside, wherein the gas sensing element can be detachably and electrically connected with the electric connecting seat and is electrically connected with the outside through the electric connecting seat; and
and the analysis device is electrically connected with the electric connection seat and is used for detecting the electric state of the gas sensing element after the gas sensing element adsorbs the carbon dioxide.
9. The detection system of claim 8, wherein: the gas extraction device is arranged in the housing and communicated with the cavity and used for extracting gas in the cavity.
10. The detection system of claim 9, wherein: the testing device also comprises a filtering air inlet piece which is arranged on the side edge of the cover shell and communicated with the cavity, and is used for filtering and guiding external air into the cavity.
CN202011155607.9A 2020-10-26 2020-10-26 Gas sensing element and detection system Pending CN114487032A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011155607.9A CN114487032A (en) 2020-10-26 2020-10-26 Gas sensing element and detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011155607.9A CN114487032A (en) 2020-10-26 2020-10-26 Gas sensing element and detection system

Publications (1)

Publication Number Publication Date
CN114487032A true CN114487032A (en) 2022-05-13

Family

ID=81470560

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011155607.9A Pending CN114487032A (en) 2020-10-26 2020-10-26 Gas sensing element and detection system

Country Status (1)

Country Link
CN (1) CN114487032A (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6200444B1 (en) * 1996-03-29 2001-03-13 Institut Fuer Chemo Und Biosensorik Muenster E.V. Cation-selective sensor
CN2700876Y (en) * 2003-12-23 2005-05-18 西安交通大学 Carbon nano tube thin film gas transducer
US20050150778A1 (en) * 2002-11-18 2005-07-14 Lewis Nathan S. Use of basic polymers in carbon black composite vapor detectors to obtain enhanced sensitivity and classification performance for volatile fatty acids
US20070048181A1 (en) * 2002-09-05 2007-03-01 Chang Daniel M Carbon dioxide nanosensor, and respiratory CO2 monitors
CN106872549A (en) * 2015-12-11 2017-06-20 台湾奈米碳素股份有限公司 Gas sensor and manufacturing method thereof
WO2018009032A1 (en) * 2016-07-07 2018-01-11 인하대학교 산학협력단 Biologically extracted melanin/polymer composite having high electrical conductivity and dense structure, and preparation method therefor
CN107686093A (en) * 2016-08-03 2018-02-13 财团法人交大思源基金会 Method for manufacturing semiconductor gas sensing device and semiconductor gas sensing device thereof
JP2018130699A (en) * 2017-02-17 2018-08-23 東京瓦斯株式会社 Separation membrane and separation membrane module
JP2019091577A (en) * 2017-11-13 2019-06-13 株式会社クラレ Carbonic acid gas generating agent and nonaqueous electrolyte storage battery using the same

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6200444B1 (en) * 1996-03-29 2001-03-13 Institut Fuer Chemo Und Biosensorik Muenster E.V. Cation-selective sensor
US20070048181A1 (en) * 2002-09-05 2007-03-01 Chang Daniel M Carbon dioxide nanosensor, and respiratory CO2 monitors
US20050150778A1 (en) * 2002-11-18 2005-07-14 Lewis Nathan S. Use of basic polymers in carbon black composite vapor detectors to obtain enhanced sensitivity and classification performance for volatile fatty acids
CN2700876Y (en) * 2003-12-23 2005-05-18 西安交通大学 Carbon nano tube thin film gas transducer
CN106872549A (en) * 2015-12-11 2017-06-20 台湾奈米碳素股份有限公司 Gas sensor and manufacturing method thereof
WO2018009032A1 (en) * 2016-07-07 2018-01-11 인하대학교 산학협력단 Biologically extracted melanin/polymer composite having high electrical conductivity and dense structure, and preparation method therefor
CN107686093A (en) * 2016-08-03 2018-02-13 财团法人交大思源基金会 Method for manufacturing semiconductor gas sensing device and semiconductor gas sensing device thereof
JP2018130699A (en) * 2017-02-17 2018-08-23 東京瓦斯株式会社 Separation membrane and separation membrane module
JP2019091577A (en) * 2017-11-13 2019-06-13 株式会社クラレ Carbonic acid gas generating agent and nonaqueous electrolyte storage battery using the same

Similar Documents

Publication Publication Date Title
Güder et al. Paper‐based electrical respiration sensor
CA2248321C (en) Condensate colorimetric nitrogen oxide analyzer
US9861298B2 (en) Gas sampling line
US20110208081A1 (en) Apparatus and method
US8323469B2 (en) Sensor and apparatus for analysing gases present in blood
KR20140104406A (en) End-tidal gas monitoring apparatus
JP2005530553A (en) Method and apparatus for monitoring respiratory gas during anesthesia
WO2011104567A1 (en) Apparatus and method for detection of ammonia in exhaled air
BG65874B1 (en) Device for measuring the temperature of exhaled air
CN109938736A (en) A kind of portable expiratory air acquisition device and method
WO2018081877A9 (en) Non-invasive photonic sensing for monitoring diabetes
JP2002306432A5 (en)
ES2369903T3 (en) METHOD AND APPLIANCE FOR VERTIFICATION OF INTRAVENOUS CONCENTRATION (IV) OF DRUGS USING EXHALED BREATH.
CN202330343U (en) Acetone gas sensor detection device
CN111505217A (en) Human body exhaled gas detection system
CN113777244A (en) Alveolar gas concentration detection device and method for separating air passage
CN114487032A (en) Gas sensing element and detection system
TWI758918B (en) Sensor device and system thereof
CN108267480A (en) One kind exhales hydrogen functions of intestines and stomach and disease detecting system and detection method
KR101168262B1 (en) Method for measuring halitosis
CN207306669U (en) One kind exhales hydrogen functions of intestines and stomach and disease detecting system
CN110780063A (en) Expiratory ammonia detection method and device
KR100608434B1 (en) Concentration measured apparatus and method thereof of oral gas
Shelat et al. Breath analysis by electronic nose for Asthma detection
CN211478332U (en) Expiration ammonia detection device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination