CN113607785A - Based on flower ball shaped Ag/Bi2WO6Ethanol gas sensor of sensitive material and preparation method thereof - Google Patents
Based on flower ball shaped Ag/Bi2WO6Ethanol gas sensor of sensitive material and preparation method thereof Download PDFInfo
- Publication number
- CN113607785A CN113607785A CN202110914357.0A CN202110914357A CN113607785A CN 113607785 A CN113607785 A CN 113607785A CN 202110914357 A CN202110914357 A CN 202110914357A CN 113607785 A CN113607785 A CN 113607785A
- Authority
- CN
- China
- Prior art keywords
- sensitive material
- flower
- ball
- ceramic tube
- shaped
- 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
Links
- 239000000463 material Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000000919 ceramic Substances 0.000 claims abstract description 32
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052737 gold Inorganic materials 0.000 claims abstract description 25
- 239000010931 gold Substances 0.000 claims abstract description 25
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 24
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 24
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 13
- 239000000725 suspension Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(I) nitrate Inorganic materials [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 229910020350 Na2WO4 Inorganic materials 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 229910003307 Ni-Cd Inorganic materials 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 39
- 230000035945 sensitivity Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011540 sensing material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G41/00—Compounds of tungsten
- C01G41/006—Compounds containing, besides tungsten, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/50—Solid solutions
- C01P2002/52—Solid solutions containing elements as dopants
- C01P2002/54—Solid solutions containing elements as dopants one element only
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
Abstract
The invention discloses a flower ball-shaped Ag/Bi-based material2WO6An ethanol gas sensor of sensitive material and its preparation method, the sensor is arranged as indirectly heated structure, including Al2O3Ceramic tube, flower ball shaped Ag/Bi2WO6Sensitive material and Ni-Cd heating coil, Al2O3Two parallel, annular and mutually separated gold electrodes are arranged on the surface of the ceramic tube, and the gold electrodes are in a flower ball shape, namely Ag/Bi2WO6Sensitive material is coated on Al2O3The surface of the ceramic tube and the gold electrode are provided with a nickel-cadmium heating coil arranged on Al2O3The preparation method of the inner part of the ceramic tube comprises the preparation of the sensor and the flower-ball-shaped Ag/Bi2WO6The sensor disclosed by the invention has the advantages of simple structure, low price, small volume and easiness in integration, and can be used for detecting ethanol gasHas good application prospect.
Description
Technical Field
The invention belongs to the technical field of gas sensors, and particularly relates to a flower ball-based Ag/Bi sensor2WO6An ethanol gas sensor of sensitive material and a preparation method thereof.
Background
As an important organic compound, ethanol is widely applied to national defense industry, medical treatment and health, organic synthesis, food industry, industrial and agricultural production and daily life. Although ethanol is widely used, because of its flammability, steam can form an explosive mixture with air, posing a great threat to industrial safety. In addition, in daily life, the consciousness of a driver can be seriously influenced by drunk driving, the safety of the driver and other people is harmed, and certain risk exists in the problem of irregular use method due to improper storage of the household ethanol. Therefore, the development of the ethanol gas sensor with low price, strong practicability and high sensitivity is necessary, and based on the requirement, various national scholars are dedicated to developing the ethanol gas sensor with high sensitivity and are applied to the aspects of drinking driving inspection, industrial production safety and the like, the invention provides the Ag/Bi based on the flower ball shape2WO6An ethanol gas sensor of sensitive material and a preparation method thereof.
Disclosure of Invention
In view of the above problems, the main object of the present invention is to design a Ag/Bi material based on flower ball2WO6An alcohol gas sensor of sensitive material and its preparing process, which uses flower ball shaped Ag/Bi2WO6The sensitive material is contacted with the ethanol gas, the resistance rises, namely, the change of the gas environment is converted into a detectable electric signal, and the ethanol gas sensor with high performance has very important significance in various fields such as environmental monitoring and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
based on flower ball shaped Ag/Bi2WO6B of sensitive materialThe alcohol gas sensor is arranged in an indirectly heated structure and comprises Al2O3Ceramic tube, flower ball shaped Ag/Bi2WO6A sensing material and a nickel-cadmium heating coil;
the Al is2O3Two parallel, annular and mutually-separated gold electrodes are arranged on the surface of the ceramic tube, and the flower-ball-shaped Ag/Bi2WO6Sensitive material is coated on Al2O3The surface of the ceramic tube and the gold electrode, the nickel-cadmium heating coil is arranged on the Al2O3Inside the ceramic tube.
As a further description of the invention, the flower-ball shaped Ag/Bi2WO6The thickness of the sensitive material is set to 15-30 μm.
As a further description of the invention, said Al2O3The inner diameter of the ceramic tube is set to be 0.6-0.8mm, the outer diameter is set to be 1.0-1.5mm, and the length is set to be 4-5 mm; the width of each gold electrode is set to be 0.4-0.5mm, the distance between the two gold electrodes is set to be 0.5-0.6mm, a platinum wire is led out of the gold electrodes, and the length of the platinum wire is set to be 4-6 mm.
As a further description of the present invention, the nickel cadmium heating coil is provided in 50-60 turns and has a resistance value of 30-40 omega.
As a further description of the invention, Ag/Bi based on flower ball shape2WO6The preparation method of the ethanol gas sensor of the sensitive material comprises the following steps:
the method comprises the following steps: taking flower ball-shaped Ag/Bi2WO6The mass ratio of the sensitive material to ethanol and PVP is 0.25-0.5: 1: 0.1 is evenly mixed into slurry, and the slurry is evenly coated on Al2O3The surface of the ceramic tube is made to completely cover the gold electrode and Al2O3A platinum wire is led out of the surface of the ceramic tube on the gold electrode;
step two: coating the ball-shaped Ag/Bi2WO6Al of sensitive material2O3Sintering the ceramic tube at 200-350 ℃ for 2-5 h, and then enabling the nickel-cadmium heating coil to penetrate through Al2O3The inside of the ceramic tube is supplied with direct currentThe working temperature is 190 ℃ and 300 ℃; welding a platinum wire on the universal indirectly heated hexagonal tube base to obtain a sensor;
step three: aging the sensor obtained in the step two for 5-7 days in an air environment at 200-400 ℃ to obtain Ag/Bi2WO6Alcohol-based gas sensors.
As a further description of the invention, the flower-ball shaped Ag/Bi2WO6The preparation steps of the sensitive material are as follows:
the method comprises the following steps: 0.005 mol of Bi (NO)3)3·5H2O and 0.1mmol AgNO3Adding 15 mL0.8 mol.L-1HNO of (2)3Stirring the solution to obtain suspension a, and adding 0.0025mol Na2WO4·2H2Dissolving O in 15 mL of distilled water to prepare a solution b;
step two: mixing the solution a and the solution b for 30min under the condition of keeping the constant temperature of 30 ℃ to obtain a suspension;
step three: pouring the suspension into a polytetrafluoroethylene reaction kettle, reacting at a constant temperature of 180 ℃ for 7h, naturally cooling to room temperature, filtering, washing, and drying in a constant temperature drying oven at 60 ℃ for 2h to obtain Ag/Bi with the Ag doping amount of 2% (n/n)2WO6A sensitive material.
Compared with the prior art, the invention has the technical effects that:
the invention provides a flower ball-based Ag/Bi2WO6Ethanol gas sensor of sensitive material and preparation method thereof, and flower-ball-shaped Ag/Bi manufactured by using ethanol gas sensor2WO6The sensor has the advantages of good stability, strong reliability, expression of good long-term stability and wide application prospect in the aspect of detecting the ethanol gas in various environments.
Drawings
FIG. 1 shows Ag/Bi of the present invention2WO6Structure of alcohol-based gas sensorAn intent;
FIG. 2 shows Ag/Bi of the present invention2WO6SEM (scanning electron microscope) images (a), (b) and (c) of sensitive material flower balls;
FIG. 3 shows Ag/Bi of the present invention at an operating temperature of 240 deg.C2WO6The real-time change curve of the resistance of the ethanol-based gas sensor in 0-700 s;
FIG. 4 shows Ag/Bi of the present invention at an operating temperature of 240 deg.C2WO6A real-time change curve of the sensitivity of the ethanol gas sensor in an ethanol gas atmosphere of 50-500 ppm;
FIG. 5 shows Ag/Bi of the present invention at an operating temperature of 240 deg.C2WO6A real-time change curve of the resistance of the ethanol gas sensor in an ethanol gas atmosphere of 50-500 ppm;
FIG. 6 shows Ag/Bi2WO6XRD pattern of the sample;
FIG. 7 shows Ag/Bi of the present invention2WO6The sensitivity of the ethanol-based gas sensor is related to the working temperature in an ethanol atmosphere of 100 ppm.
In the figure, 1.Al2O3Ceramic tube, 2. flower ball shaped Ag/Bi2WO6Sensitive material, 3, nickel-cadmium heating coil, 4, gold electrode, 5, platinum wire.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
based on flower ball shaped Ag/Bi2WO6The ethanol gas sensor of sensitive material is arranged in an indirectly heated structure, as shown in figure 1, and comprises Al2O3 Ceramic tube 1, flower ball shaped Ag/Bi2WO6A sensitive material 2 and a nickel-cadmium heating coil 3; the Al is2O3Two parallel and annular gold electrodes 4 which are separated from each other are arranged on the surface of the ceramic tube 1, and the flower ball shaped Ag/Bi2WO6 Sensitive material 2 is coated on Al2O3The surface of the ceramic tube 1 and the gold electrode 4, the nickel-cadmium heating coil 3 is arranged on Al2O3Inside the ceramic tube 1.
The flower-ball-shaped Ag/Bi2WO6Thickness of the sensitive material 2Set to 15-30 μm.
The Al is2O3The inner diameter of the ceramic tube 1 is set to be 0.6-0.8mm, the outer diameter is set to be 1.0-1.5mm, and the length is set to be 4-5 mm; the width of each gold electrode 4 is set to be 0.4-0.5mm, the distance between the two gold electrodes 4 is set to be 0.5-0.6mm, a platinum wire 5 is led out of each gold electrode 4, and the length of each platinum wire 5 is set to be 4-6 mm.
The nickel-cadmium heating coil 3 is set to be 50-60 turns, and the resistance value is 30-40 omega.
The structural characteristics of the sensor to be protected according to the invention are disclosed above, and it should be noted that the Ag/Bi is in the shape of a flower ball2WO6The sensitive material 2 has a uniform size, and as shown in fig. 2 (a), each ball has a diameter of about 5um, as shown in fig. 2 (b), each ball has a diameter of about 2um, and as shown in fig. 2 (c), each ball has a diameter of about 1 um.
As shown in FIG. 3, the Ag/Bi of the present invention is at an operating temperature of 240 deg.C2WO6The sensitivity (Ra/Rg) of the ethanol-based gas sensor is unchanged when the real-time change curve of the resistance of the ethanol-based gas sensor starts in ethanol gas, the sensitivity of the sensor is increased when the environmental component of the sensor is changed from air to ethanol gas, and the sensitivity of the sensor is reduced when the environmental component of the sensor is changed from ethanol gas to air.
As shown in FIG. 4, the Ag/Bi of the present invention is at an operating temperature of 240 deg.C2WO6The real-time change curve of the sensitivity of the ethanol-based gas sensor in the ethanol gas atmosphere of 50-500ppm has the most obvious sensitivity change in the range of 200-300 ppm.
As shown in FIG. 5, when the sensor disclosed by the invention is operated at 240 ℃, the sensor has good repeatability and response recovery characteristics, and the response time (T) isres) At 7s, recovery time (T)rec) Was 25 s.
As shown in FIG. 6 (a), made of Ag/Bi2WO6The XRD pattern of the sample shows that Bi appears at 28 degrees, 33 degrees, 47 degrees, 56 degrees, 59 degrees, 76 degrees and 79 degrees of 2 theta2WO6Characteristic peaks, each diffraction peak completely coincided with the standard card,no impurity phase appears; as can be seen from (b) (c) of FIG. 6, after doping Ag, the peaks at 28 ℃ and 33 ℃ are changed because Ag+And Bi-Have similar ionic radii so that Ag is+Can replace Bi3+Thereby causing lattice distortion and shifting the peak position to some extent.
Based on flower ball shaped Ag/Bi2WO6The preparation method of the ethanol gas sensor of the sensitive material comprises the following steps:
the method comprises the following steps: 0.005 mol of Bi (NO)3)3·5H2O and 0.1mmol AgNO3Adding 15 mL0.8 mol.L-1HNO of (2)3Stirring the solution to obtain suspension a, and adding 0.0025mol Na2WO4·2H2Dissolving O in 15 mL of distilled water to prepare a solution b;
step two: mixing the solution a and the solution b for 30min under the condition of keeping the constant temperature of 30 ℃ to obtain a suspension;
step three: pouring the suspension into a polytetrafluoroethylene reaction kettle, reacting at a constant temperature of 180 ℃ for 7h, naturally cooling to room temperature, filtering, washing, and drying in a constant temperature drying oven at 60 ℃ for 2h to obtain Ag/Bi with the Ag doping amount of 2% (n/n)2WO6A sensitive material;
step four: taking flower ball-shaped Ag/Bi2WO6The mass ratio of the sensitive material to ethanol and PVP is 0.25-0.5: 1: 0.1 is evenly mixed into slurry, and the slurry is evenly coated on Al2O3The surface of the ceramic tube is made to completely cover the gold electrode and Al2O3A platinum wire is led out of the surface of the ceramic tube on the gold electrode;
step five: coating the ball-shaped Ag/Bi2WO6Al of sensitive material2O3Sintering the ceramic tube at 200-350 ℃ for 2-5 h, and then enabling the nickel-cadmium heating coil to penetrate through Al2O3The inside of the ceramic tube is electrified with direct current to provide working temperature, and the working temperature is 190 ℃ and 300 ℃; welding a platinum wire on the universal indirectly heated hexagonal tube base to obtain a sensor;
step six: aging the sensor obtained in the fifth step in an air environment at 200-400 ℃ for 5-7 days to obtain Ag/Bi2WO6Alcohol-based gas sensors.
The working principle of the invention is as follows: when Ag/Bi2WO6When the gas sensor is placed in the air, oxygen molecules in the air can be separated from Bi2WO6By abstraction of electrons by O2 -、O-Or O2-When the sensor is contacted with reductive ethanol gas at a certain temperature, ethanol gas molecules will react with oxygen molecules adsorbed on the surface of the sensor and release electrons, and the resistance is reduced.
As shown in fig. 7, we define the sensitivity S = Ra/Rg of the sensor here, where Ra is the resistance of the sensor in air and Rg is the resistance of the sensor after contact with ethanol.
The invention provides a flower ball-based Ag/Bi2WO6Ethanol gas sensor of sensitive material and preparation method thereof, and flower-ball-shaped Ag/Bi manufactured by using ethanol gas sensor2WO6The sensor has the advantages of good stability, strong reliability, expression of good long-term stability and wide application prospect in the aspect of detecting the ethanol gas in various environments.
The above embodiments are only for illustrating the technical solutions of the present invention and are not limited, and other modifications or equivalent substitutions made by the technical solutions of the present invention by the ordinary skilled person in the art are included in the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. Based on flower ball shaped Ag/Bi2WO6The ethanol gas sensor of the sensitive material is characterized in that: arranged in an indirectly heated configuration comprising Al2O3Ceramic tube, flower ball shaped Ag/Bi2WO6Sensitive material and nickel cadmium heatingA coil;
the Al is2O3Two parallel, annular and mutually-separated gold electrodes are arranged on the surface of the ceramic tube, and the flower-ball-shaped Ag/Bi2WO6Sensitive material is coated on Al2O3The surface of the ceramic tube and the gold electrode, the nickel-cadmium heating coil is arranged on the Al2O3Inside the ceramic tube.
2. Based on flower ball shaped Ag/Bi2WO6The ethanol gas sensor of the sensitive material is characterized in that: the flower-ball-shaped Ag/Bi2WO6The thickness of the sensitive material is set to 15-30 μm.
3. Based on flower ball shaped Ag/Bi2WO6The ethanol gas sensor of the sensitive material is characterized in that: the Al is2O3The inner diameter of the ceramic tube is set to be 0.6-0.8mm, the outer diameter is set to be 1.0-1.5mm, and the length is set to be 4-5 mm; the width of each gold electrode is set to be 0.4-0.5mm, the distance between the two gold electrodes is set to be 0.5-0.6mm, a platinum wire is led out of the gold electrodes, and the length of the platinum wire is set to be 4-6 mm.
4. Based on flower ball shaped Ag/Bi2WO6The ethanol gas sensor of the sensitive material is characterized in that: the nickel-cadmium heating coil is set to be 50-60 turns, and the resistance value is 30-40 omega.
5. Flower-ball-based Ag/Bi according to any one of claims 1 to 42WO6The preparation method of the ethanol gas sensor of the sensitive material is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: taking flower ball-shaped Ag/Bi2WO6The mass ratio of the sensitive material to ethanol and PVP is 0.25-0.5: 1: 0.1 is evenly mixed into slurry, and the slurry is evenly coated on Al2O3The surface of the ceramic tube is made to completely cover the gold electrode and Al2O3A platinum wire is led out of the surface of the ceramic tube on the gold electrode;
step two: coating the ball-shaped Ag/Bi2WO6Al of sensitive material2O3Sintering the ceramic tube at 200-350 ℃ for 2-5 h, and then enabling the nickel-cadmium heating coil to penetrate through Al2O3The inside of the ceramic tube is electrified with direct current to provide working temperature, and the working temperature is 190 ℃ and 300 ℃; welding a platinum wire on the universal indirectly heated hexagonal tube base to obtain a sensor;
step three: aging the sensor obtained in the step two for 5-7 days in an air environment at 200-400 ℃ to obtain Ag/Bi2WO6Alcohol-based gas sensors.
6. Flower-ball-based Ag/Bi according to claim 52WO6The preparation method of the ethanol gas sensor of the sensitive material is characterized by comprising the following steps: the flower-ball-shaped Ag/Bi2WO6The preparation steps of the sensitive material are as follows:
the method comprises the following steps: 0.005 mol of Bi (NO)3)3·5H2O and 0.1mmol AgNO3Adding 15 mL0.8 mol.L-1HNO of (2)3Stirring the solution to obtain suspension a, and adding 0.0025mol Na2WO4·2H2Dissolving O in 15 mL of distilled water to prepare a solution b;
step two: mixing the solution a and the solution b for 30min under the condition of keeping the constant temperature of 30 ℃ to obtain a suspension;
step three: pouring the suspension into a polytetrafluoroethylene reaction kettle, reacting at a constant temperature of 180 ℃ for 7h, naturally cooling to room temperature, filtering, washing, and drying in a constant temperature drying oven at 60 ℃ for 2h to obtain Ag/Bi with the Ag doping amount of 2% (n/n)2WO6A sensitive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110914357.0A CN113607785A (en) | 2021-08-10 | 2021-08-10 | Based on flower ball shaped Ag/Bi2WO6Ethanol gas sensor of sensitive material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110914357.0A CN113607785A (en) | 2021-08-10 | 2021-08-10 | Based on flower ball shaped Ag/Bi2WO6Ethanol gas sensor of sensitive material and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113607785A true CN113607785A (en) | 2021-11-05 |
Family
ID=78308015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110914357.0A Pending CN113607785A (en) | 2021-08-10 | 2021-08-10 | Based on flower ball shaped Ag/Bi2WO6Ethanol gas sensor of sensitive material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113607785A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115445616A (en) * | 2022-10-21 | 2022-12-09 | 厦门理工学院 | Preparation method and application of silver-doped bismuth tungstate heterojunction photocatalyst |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458827A (en) * | 2014-12-15 | 2015-03-25 | 吉林大学 | NO2 gas sensor based on hollow spherical WO3 and preparation method of NO2 gas sensor based on the hollow spherical WO3 |
| CN108169291A (en) * | 2017-12-18 | 2018-06-15 | 吉林大学 | The ethanol sensor of Zn doping CdS nano sensitive materials based on graded structure, preparation method and applications |
| CN108355678A (en) * | 2018-03-09 | 2018-08-03 | 南昌航空大学 | A kind of compound micron bouquet of artificial gold-bismuth tungstate and its preparation method and application |
| CN108828021A (en) * | 2018-05-03 | 2018-11-16 | 吉林大学 | Based on branching SnO2The alcohol gas sensor and preparation method thereof of/ZnO heterojunction structure sensitive material |
-
2021
- 2021-08-10 CN CN202110914357.0A patent/CN113607785A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458827A (en) * | 2014-12-15 | 2015-03-25 | 吉林大学 | NO2 gas sensor based on hollow spherical WO3 and preparation method of NO2 gas sensor based on the hollow spherical WO3 |
| CN108169291A (en) * | 2017-12-18 | 2018-06-15 | 吉林大学 | The ethanol sensor of Zn doping CdS nano sensitive materials based on graded structure, preparation method and applications |
| CN108355678A (en) * | 2018-03-09 | 2018-08-03 | 南昌航空大学 | A kind of compound micron bouquet of artificial gold-bismuth tungstate and its preparation method and application |
| CN108828021A (en) * | 2018-05-03 | 2018-11-16 | 吉林大学 | Based on branching SnO2The alcohol gas sensor and preparation method thereof of/ZnO heterojunction structure sensitive material |
Non-Patent Citations (4)
| Title |
|---|
| 刘勇 等: "Ag/Bi2WO6复合材料的制备及光催化性能" * |
| 第10期: "溶胶－凝胶法制备Ag+掺杂Bi2WO6及其可见光光催化性能研究", 《化工新型材料》 * |
| 胡兴定，张文朴，张改莲: "钨酸铋和钨酸铁铋气体敏感材料的研究", 《稀有金属》 * |
| 陈建等: "光沉积Pd修饰Bi_2WO_6微米花用作乙醇气敏传感器", 《仪表技术与传感器》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115445616A (en) * | 2022-10-21 | 2022-12-09 | 厦门理工学院 | Preparation method and application of silver-doped bismuth tungstate heterojunction photocatalyst |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Dong et al. | Hierarchically rosette-like In2O3 microspheres for volatile organic compounds gas sensors | |
| CN103901081A (en) | Preparation method for ZnO-In2O3 nano semiconductor crystal gas sensitive material | |
| Shen et al. | Highly sensitive ethanol gas sensor based on In 2 O 3 spheres | |
| CN113607785A (en) | Based on flower ball shaped Ag/Bi2WO6Ethanol gas sensor of sensitive material and preparation method thereof | |
| CN110006958A (en) | Co3O4The preparation method of ZnO nano material acetone thick film gas-sensitive sensor | |
| CN109668936A (en) | One kind being based on flower-shaped SnSe2/SnO2Nitrogen dioxide gas sensor, preparation process and the application of hetero-junctions | |
| CN108535334B (en) | Preparation method of methanol gas sensor with tin oxide nano-particles and zinc oxide nano-wire agglomeration structure | |
| CN111830089A (en) | Based on two shell shape Cu2N-propanol gas sensor of O-grade structure micron sphere sensitive material and preparation method thereof | |
| Cai et al. | Preparation of YVO4 octahedral nanomaterials and gas-sensing characteristics to triethylamine | |
| Qin et al. | Self-template-derived ZnCo 2 O 4 porous microspheres decorated by Ag nanoparticles and their selective detection of formaldehyde | |
| Wang et al. | Fast detection of alcohols by novel sea cucumber-like indium tungsten oxide | |
| CN107884446B (en) | Ethanol gas sensor based on multi-element metal oxide sensitive material | |
| CN107132252A (en) | A kind of preparation method of tin dope nickel oxide gas sensitive | |
| CN109626425B (en) | Nano linear Na1.1V3O7.9Material, method for the production thereof and use thereof | |
| CN116873973B (en) | La 0.5 Li 0.5 TiO 3 CuO nano material, MEMS propyl acetate sensor and preparation method | |
| CN109133183B (en) | α-Fe2O3Production of nano microsphere hydrogen sulfide gas-sensitive material and element | |
| CN110530941B (en) | Cu doped Sn3O4Gas sensitive material, formaldehyde gas sensor, preparation method and application thereof | |
| CN109187659B (en) | MoO based on Pt modification 3 Nanowire sensor and manufacturing method thereof | |
| CN115072808A (en) | Nickel molybdate-nickel oxide flower-like microsphere material, preparation method and application thereof, ethanol gas sensor and preparation method thereof | |
| CN109589982A (en) | A kind of preparation method of nickel oxide-base composite semiconductor nanofiber | |
| CN110044975B (en) | Acetylene gas sensor made of zinc oxide-doped titanium dioxide nano material and manufacturing method thereof | |
| CN113912115A (en) | Preparation method of vanadium oxide nano material and application of vanadium oxide nano material in gas sensor | |
| CN113960119A (en) | Ni-doped SnO2Preparation method of CuO-modified gas sensor | |
| Jońca et al. | Towards selective and sensitive detection of carbon monoxide with CuO/ZnO heterojunction nanocomposite prepared by an organometallic approach | |
| CN110907503A (en) | Manufacturing method of hierarchical porous structure metal oxide and metal oxide semiconductor gas sensor |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211105 |