CN106053549A - Gas sensitive material for detecting low-concentration acetone - Google Patents
Gas sensitive material for detecting low-concentration acetone Download PDFInfo
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- CN106053549A CN106053549A CN201610384382.1A CN201610384382A CN106053549A CN 106053549 A CN106053549 A CN 106053549A CN 201610384382 A CN201610384382 A CN 201610384382A CN 106053549 A CN106053549 A CN 106053549A
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- gas
- acetone
- sensitive material
- gas sensitive
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- 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
- G01N27/127—Composition of the body, e.g. the composition of its sensitive layer comprising nanoparticles
Abstract
The invention discloses a gas sensitive material for detecting low-concentration acetone and belongs to the technical field of gas sensitive materials. The gas sensitive material is composed of graphene quantum dot-SnO2, wherein the mass of graphene quantum dots is 5-15% of the total mass of the gas sensitive material. The sensitivity (the ratio of element resistance in the air to element resistance in gas to be detected), to acetone of 0.1 ppm, of an indirectly heated gas sensor prepared with the gas sensitive material as a sensitive material is 1.2-1.5 at the working temperature of 270 DEG C, and the sensitivity to acetone of 1000 ppm is 100-140. Response recovery time is smaller than 50 s. The sensitivity, to methanol, ethanol, methylbenzene, benzene and trimethylamine gas of 1000 ppm, of the element is lower than 4.1 at the same working temperature, and therefore quick detection of low-concentration acetone in the air can be achieved.
Description
Technical field
The invention belongs to gas sensitive technical field, be specifically related to a kind of low concentration acetone in air is had high sensitivity and
The most selective gas sensitive.
Technical background
Acetone is a kind of colourless transparent liquid, has special acrid odors.Industrially mainly as solvent for explosive,
In plastics, rubber, fiber, process hides, oils and fats, the industry such as spray paint, it is possible to as synthesis ketenes, acetic anhydride, iodoform, polyisoprene rubber
The important source material of the materials such as glue, methyl methacrylate, chloroform, epoxy resin.Acetone has suppression, anesthesia to central nervous system
Effect, high concentration contact is likely to occur the infringement of liver, kidney and pancreas to one or two people.China regulation working place and residential area
The limit value of acetone in air is 400mg/m respectively3(about 168ppm) and 0.8mg/m3(about 0.34ppm).Measure at present in air third
The method of ketone concentration mainly uses gas chromatography, and the method needs instrument and equipment costly, and sampling analysis needs to expend relatively
For a long time.
Summary of the invention
For overcoming the deficiencies in the prior art, the technical problem to be solved in the present invention is to provide a kind of gas sensitive, this material
Can be used for make gas sensor gas sensor, the gas sensor made low concentration acetone in air is had high sensitivity and
Preferably selectivity.
In order to solve above technical problem, the present invention is achieved by the following technical programs.
The invention provides a kind of gas sensitive for detecting low concentration acetone, this gas sensitive is by SnO2And Graphene
Quantum dot forms, wherein: the quality of graphene quantum dot accounts for the 5-15% of gas sensitive gross mass.
Preparation method and the process of described graphene quantum dot be: first, 1.0800g graphite oxide is scattered in 80mL diformazan
Ultrasonic 30min in base Methanamide (DMF).Then, mixture is proceeded to 200 DEG C of reactions in politef stainless steel cauldron
8h.Being cooled to room temperature after question response, with the filter membrane sucking filtration of aperture 0.22 μm, the brown filtrate after sucking filtration is containing Graphene amount
The solution of son point, collects brown filtrate stand-by.
Described graphene quantum dot-SnO2Composite preparation process is: the graphene quantum dot solution of different volumes divides
Dissipate formation 40mL solution, ultrasonic 30min in DMF.Simultaneously by 0.7012g analytical pure SnCl4·5H2O and 0.2402g carbamide adds
Enter in above-mentioned solution ultrasonic 30min.Finally this solution is transferred in 50mL politef stainless steel autoclave 160 DEG C,
10h.React and be cooled to room temperature, by product deionized water and dehydrated alcohol filtration washing five times, obtained after 80 DEG C of dry 12h
Graphene quantum dot-SnO2Nano composite material.
The material of the present invention can utilize this material to make heater-type gas as the sensitive material of acetone gas sensing element
The method of quick element is: 0.1 gram of material and 0.5 gram of terpineol mixed grinding are made slurry, with small brushes, slurry is coated onto oxygen
Change the surface of aluminum earthenware；The size of alumina ceramic tube is: long 6 millimeters, internal diameter 1.6 millimeters, external diameter 2 millimeters, at aluminium oxide
Pipe two ends gold medal makees electrode, electrode is welded with spun gold as lead-in wire, and the spacing of electrode is 1 millimeter；Put in alumina tube
Put nichrome wire as heater strip, flow through the electric current of heater strip by control and heater strip both end voltage can control aluminium oxide
The temperature of tube-surface sensitive material；The alumina tube scribbling sensitive material slurry is placed under infrared lamp drying, i.e. obtains indirect heat
Formula gas sensor.Element is at the working temperature to the sensitivity of certain gas, and element resistance in atmosphere and element are tested
The ratio of resistance in gas.
Compared with prior art, the present invention has following technical effect that
1, the present invention passes through hydro-thermal reaction method at SnO2In graphene-doped quantum dot make composite, make with this material
The heater-type gas sensor made for sensitive material, it is possible to achieve the quick detection of low concentration acetone in air.
2, this gas sensitive has high sensitivity and preferable selectivity to low concentration acetone in air.Using this material as sensitivity
The heater-type gas sensor that material is made, when operating temperature is 270 DEG C, element reaches sensitivity to 1000ppm acetone and reaches
100-140, reaches 1.2-1.5 to the sensitivity of 0.1ppm acetone gas, and to the response of 0.1-1000ppm acetone gas and
Recovery time is respectively less than 25s and 50s.This element under identical operating temperature to the formaldehyde of 1000ppm, ethanol, toluene,
Benzene, the sensitivity of trimethylamine gas are below 4.1.
Detailed description of the invention
Below in conjunction with specific embodiment in detail the present invention is described in detail, but the present invention is not limited to following embodiment.
Embodiment 1
5mL graphene quantum dot solution is scattered in 35mL DMF formation 40mL solution, ultrasonic 30min.By 0.7012g
Analytical pure SnCl4·5H2O and 0.2402g carbamide joins ultrasonic 30min in above-mentioned solution.Finally this solution is transferred to 50mL
In politef stainless steel autoclave 160 DEG C, 10h.React and be cooled to room temperature, by product deionized water and dehydrated alcohol
Filtration washing five times, obtains graphene quantum dot-SnO after 80 DEG C of dry 12h2Nano composite material.Through thermogravimetric analysis composite wood
In material, graphene quantum dot content is 5%wt.
Material is made heater-type element, record element under 270 DEG C of operating temperatures to 0.1,1,10,100,1000ppm
The maximum sensitivity of acetone gas is respectively 1.2,5.4,29,78,100.Acetone response time and recovery to 0.1-1000pp
Time is less than 20 seconds and 45 seconds.This element under identical operating temperature to the formaldehyde of 1000ppm, ethanol, toluene, benzene, front three
The sensitivity of amine gas is below 3.5.
Embodiment 2
10mL graphene quantum dot solution is scattered in 30mL DMF formation 40mL solution, ultrasonic 30min.Will
0.7012g analytical pure SnCl4·5H2O and 0.2402g carbamide joins ultrasonic 30min in above-mentioned solution.Finally this solution is turned
Move in 50mL politef stainless steel autoclave 160 DEG C, 10h.Reacted and be cooled to room temperature, by product deionized water and
Dehydrated alcohol filtration washing five times, obtains graphene quantum dot-SnO after 80 DEG C of dry 12h2Nano composite material.Divide through thermogravimetric
In analysis composite, graphene quantum dot content is 9%wt.
Material is made heater-type element, record element under 270 DEG C of operating temperatures to 0.1,1,10,100,1000ppm
The maximum sensitivity of acetone gas is respectively 1.5,7.4,33,91,140.Acetone response time and recovery to 0.1-1000pp
Time is less than 25 seconds and 50 seconds.This element under identical operating temperature to the formaldehyde of 1000ppm, ethanol, toluene, benzene, front three
The sensitivity of amine gas is below 4.1.
Embodiment 3
12mL graphene quantum dot solution is scattered in 28mL DMF formation 40mL solution, ultrasonic 30min.Will
0.7012g analytical pure SnCl4·5H2O and 0.2402g carbamide joins ultrasonic 30min in above-mentioned solution.Finally this solution is turned
Move in 50mL politef stainless steel autoclave 160 DEG C, 10h.Reacted and be cooled to room temperature, by product deionized water and
Dehydrated alcohol filtration washing five times, obtains graphene quantum dot-SnO after 80 DEG C of dry 12h2Nano composite material.Divide through thermogravimetric
In analysis composite, graphene quantum dot content is 11%wt.
Material is made heater-type element, record element under 270 DEG C of operating temperatures to 0.1,1,10,100,1000ppm
The maximum sensitivity of acetone gas is respectively 1.4,7.0,30,86,123.Acetone response time and recovery to 0.1-1000pp
Time is less than 23 seconds and 48 seconds.This element under identical operating temperature to the formaldehyde of 1000ppm, ethanol, toluene, benzene, front three
The sensitivity of amine gas is below 3.8.
Embodiment 4
16mL graphene quantum dot solution is scattered in 24mL DMF formation 40mL solution, ultrasonic 30min.Will
0.7012g analytical pure SnCl4·5H2O and 0.2402g carbamide joins ultrasonic 30min in above-mentioned solution.Finally this solution is turned
Move in 50mL politef stainless steel autoclave 160 DEG C, 10h.Reacted and be cooled to room temperature, by product deionized water and
Dehydrated alcohol filtration washing five times, obtains graphene quantum dot-SnO after 80 DEG C of dry 12h2Nano composite material.Divide through thermogravimetric
In analysis composite, graphene quantum dot content is 15%wt.
Material is made heater-type element, record element under 270 DEG C of operating temperatures to 0.1,1,10,100,1000ppm
The maximum sensitivity of acetone gas is respectively 1.3,6.7,28,80,112.Acetone response time and recovery to 0.1-1000pp
Time is less than 23 seconds and 50 seconds.This element under identical operating temperature to the formaldehyde of 1000ppm, ethanol, toluene, benzene, front three
The sensitivity of amine gas is below 3.7.
Claims (1)
1. the gas sensitive being used for detecting low concentration acetone, it is characterised in that this gas sensitive is by SnO2With Graphene quantum
Point composition, wherein: the quality of graphene quantum dot accounts for the 5-15% of gas sensitive gross mass.
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| CN201610384382.1A CN106053549B (en) | 2016-05-30 | 2016-05-30 | It is a kind of for detecting the gas sensitive of low concentration acetone |
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| CN201610384382.1A CN106053549B (en) | 2016-05-30 | 2016-05-30 | It is a kind of for detecting the gas sensitive of low concentration acetone |
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| CN106053549B CN106053549B (en) | 2019-02-19 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770466A (en) * | 2016-11-30 | 2017-05-31 | 庞倩桃 | Enhanced gas sensor of a kind of iron oxide quantum dot and preparation method thereof |
| CN106770498A (en) * | 2017-01-12 | 2017-05-31 | 吉林大学 | Acetone sensor, the preparation method and application of the rhodium doped stannic oxide nanometer fiber sensitive material prepared based on electrostatic spinning technique |
| CN107121454A (en) * | 2017-04-17 | 2017-09-01 | 云南大学 | A kind of different element doping graphene quantum dots are respectively with molecular engram compound gas sensitive and preparation method and application |
| CN108693221A (en) * | 2018-04-18 | 2018-10-23 | 安徽工业大学 | A kind of composite air-sensitive material highly selective to low concentration acetone |
| CN108732207A (en) * | 2018-04-17 | 2018-11-02 | 上海理工大学 | A kind of sensitive material used in formaldehyde examination and preparation method and application |
| CN109133176A (en) * | 2018-07-31 | 2019-01-04 | 漯河医学高等专科学校 | ZnO-CeO2-WO3-Al2O3The preparation method and acetone cyanohydrin gas sensor of sensor material |
| CN109459470A (en) * | 2018-11-27 | 2019-03-12 | 中国石油大学(华东) | Palladium/cobaltosic oxide-the graphene film sensitive to extremely low concentration acetone under a kind of lower temperature |
| CN110736770A (en) * | 2019-10-16 | 2020-01-31 | 郑州大学 | N-GQDs modified 3DOM In2O3Composite material and preparation method and application thereof |
| CN112362702A (en) * | 2020-11-13 | 2021-02-12 | 安徽工业大学 | Composite gas-sensitive material with high gas-sensitive selectivity and low detection limit for toluene at room temperature |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770466A (en) * | 2016-11-30 | 2017-05-31 | 庞倩桃 | Enhanced gas sensor of a kind of iron oxide quantum dot and preparation method thereof |
| CN106770498A (en) * | 2017-01-12 | 2017-05-31 | 吉林大学 | Acetone sensor, the preparation method and application of the rhodium doped stannic oxide nanometer fiber sensitive material prepared based on electrostatic spinning technique |
| CN106770498B (en) * | 2017-01-12 | 2019-03-05 | 吉林大学 | Acetone sensor, the preparation method and application of rhodium doped stannic oxide nanometer fiber sensitive material based on electrostatic spinning technique preparation |
| CN107121454B (en) * | 2017-04-17 | 2019-08-30 | 云南大学 | A kind of difference element doping graphene quantum dot is respectively with molecular engram compound gas sensitive and the preparation method and application thereof |
| CN107121454A (en) * | 2017-04-17 | 2017-09-01 | 云南大学 | A kind of different element doping graphene quantum dots are respectively with molecular engram compound gas sensitive and preparation method and application |
| CN108732207A (en) * | 2018-04-17 | 2018-11-02 | 上海理工大学 | A kind of sensitive material used in formaldehyde examination and preparation method and application |
| CN108732207B (en) * | 2018-04-17 | 2020-03-20 | 上海理工大学 | Sensitive material for formaldehyde detection and preparation method and application thereof |
| CN108693221A (en) * | 2018-04-18 | 2018-10-23 | 安徽工业大学 | A kind of composite air-sensitive material highly selective to low concentration acetone |
| CN109133176A (en) * | 2018-07-31 | 2019-01-04 | 漯河医学高等专科学校 | ZnO-CeO2-WO3-Al2O3The preparation method and acetone cyanohydrin gas sensor of sensor material |
| CN109133176B (en) * | 2018-07-31 | 2020-07-31 | 漯河医学高等专科学校 | ZnO-CeO2-WO3-Al2O3Preparation method of sensor material and acetone cyanohydrin gas sensor |
| CN109459470A (en) * | 2018-11-27 | 2019-03-12 | 中国石油大学(华东) | Palladium/cobaltosic oxide-the graphene film sensitive to extremely low concentration acetone under a kind of lower temperature |
| CN110736770A (en) * | 2019-10-16 | 2020-01-31 | 郑州大学 | N-GQDs modified 3DOM In2O3Composite material and preparation method and application thereof |
| CN110736770B (en) * | 2019-10-16 | 2022-04-19 | 郑州大学 | N-GQDs modified 3DOM In2O3Composite material and preparation method and application thereof |
| CN112362702A (en) * | 2020-11-13 | 2021-02-12 | 安徽工业大学 | Composite gas-sensitive material with high gas-sensitive selectivity and low detection limit for toluene at room temperature |
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