CN113189154A - Room-temperature low-concentration hydrogen sulfide gas-sensitive material and preparation method thereof - Google Patents
Room-temperature low-concentration hydrogen sulfide gas-sensitive material and preparation method thereof Download PDFInfo
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- 239000007789 gas Substances 0.000 title claims abstract description 80
- 239000000463 material Substances 0.000 title claims abstract description 44
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002105 nanoparticle Substances 0.000 claims abstract description 11
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 8
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 8
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 17
- 239000008367 deionised water Substances 0.000 claims description 11
- 229910021641 deionized water Inorganic materials 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- HEBRGEBJCIKEKX-UHFFFAOYSA-M sodium;2-hexadecylbenzenesulfonate Chemical compound [Na+].CCCCCCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O HEBRGEBJCIKEKX-UHFFFAOYSA-M 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- QWMFKVNJIYNWII-UHFFFAOYSA-N 5-bromo-2-(2,5-dimethylpyrrol-1-yl)pyridine Chemical compound CC1=CC=C(C)N1C1=CC=C(Br)C=N1 QWMFKVNJIYNWII-UHFFFAOYSA-N 0.000 claims description 6
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 6
- 241000482268 Zea mays subsp. mays Species 0.000 claims description 6
- FBXVOTBTGXARNA-UHFFFAOYSA-N bismuth;trinitrate;pentahydrate Chemical compound O.O.O.O.O.[Bi+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FBXVOTBTGXARNA-UHFFFAOYSA-N 0.000 claims description 6
- 239000012467 final product Substances 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000002131 composite material Substances 0.000 description 7
- 230000004044 response Effects 0.000 description 7
- 239000002135 nanosheet Substances 0.000 description 6
- 239000002086 nanomaterial Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 229910020350 Na2WO4 Inorganic materials 0.000 description 4
- 230000032683 aging Effects 0.000 description 4
- 238000001027 hydrothermal synthesis Methods 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 description 4
- HFQQZARZPUDIFP-UHFFFAOYSA-M sodium;2-dodecylbenzenesulfonate Chemical compound [Na+].CCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O HFQQZARZPUDIFP-UHFFFAOYSA-M 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000000241 respiratory effect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 206010006326 Breath odour Diseases 0.000 description 1
- 208000032139 Halitosis Diseases 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 239000000090 biomarker Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000002173 high-resolution transmission electron microscopy Methods 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000004393 prognosis Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000011540 sensing material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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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
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- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a room-temperature low-concentration hydrogen sulfide gas-sensitive material and a preparation method thereof in the technical field of gas-sensitive materials, wherein the gas-sensitive material comprises a bismuth tungstate micro-flower hierarchical structure and tungsten trioxide nano-particles, and the tungsten trioxide nano-particles are loaded on the surface of the bismuth tungstate micro-flower hierarchical structure; the gas-sensitive material disclosed by the invention has excellent gas-sensitive performance on low-concentration hydrogen sulfide at room temperature.
Description
Technical Field
The invention belongs to the technical field of gas sensitive materials, and particularly relates to a room-temperature low-concentration hydrogen sulfide gas sensitive material and a preparation method thereof.
Background
While pursuing a healthy life, environmental and food safety are also attracting more attention. Hydrogen sulfide (H)2S) is colorless, has foul smell (egg odor) and toxicity, has great threat to human health, and can stimulate and damage respiratory organs and eyes even if the concentration is low. H in industrial environment2The Threshold Limit Value (TLV) for S is defined as 10 ppm, and furthermore H is present in human health2Acceptable levels of S should not exceed 100 ppb. H2S is also a volatile biomarker gas produced by the decomposition of amino acids containing sulfhydryl groups in fish, and H is the time when fish begin to deteriorate2Trace amounts of S will reach or even exceed ppb and, in addition, changes in the concentration of hydrogen sulfide in exhaled breath (usually ppb levels) can be used for real-time prognosis for diagnosing halitosis and systemic diseasesAnd (4) preventing. Thus, ppb levels of H were developed for real-time and effective for the environment, food safety and human health2High performance gas sensing materials for S detection are necessary.
In the prior art, the name "Nanostructure Bi" is published in the journal of Sensors and actors B: Chemical2WO6: Surfactant-assisted hydrothermal synthesis for high sensitive and selective sensing of H2S ", which describes the preparation of Bi by hydrothermal method using sucrose as template in the presence of four surfactants2WO6Nanostructure, studied for H at medium and high temperature2S and ethanol, but not hydrogen sulfide at room temperature.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a room-temperature low-concentration hydrogen sulfide gas-sensitive material and a preparation method thereof, solves the technical problem that the gas-sensitive material in the prior art has high working temperature for low-concentration hydrogen sulfide gas, and has excellent gas-sensitive performance for low-concentration hydrogen sulfide at room temperature.
The purpose of the invention is realized as follows: the room-temperature low-concentration hydrogen sulfide gas-sensitive material comprises a bismuth tungstate popcorn hierarchical structure and tungsten trioxide nanoparticles, wherein the tungsten trioxide nanoparticles are loaded on the surface of the bismuth tungstate popcorn hierarchical structure.
As a further improvement of the invention, the mass percent of the tungsten trioxide nano particles is 10-40%.
The method for preparing the room-temperature low-concentration hydrogen sulfide gas-sensitive material comprises the following steps:
(1) dissolving bismuth nitrate pentahydrate, sodium tungstate dihydrate and sodium hexadecylbenzene sulfonate in a certain molar ratio in deionized water at room temperature, and magnetically stirring to obtain a uniformly mixed solution;
(2) and transferring the mixed solution into a stainless steel high-pressure reaction kettle, sealing, reacting for a period of time at a certain temperature, naturally cooling to room temperature after the reaction is finished, and sequentially centrifuging, washing and drying to obtain a final product.
In order to prepare the low-concentration hydrogen sulfide gas-sensitive material, the molar ratio of the bismuth nitrate pentahydrate to the sodium tungstate dihydrate is 2 mmol: 1+ x mmol, wherein x = 0.5-2.0.
In order to further prepare the low-concentration hydrogen sulfide gas-sensitive material, the molar mass of the sodium hexadecylbenzene sulfonate is 0.09-0.11 mmol.
As a further improvement of the invention, in the step (2), the drying temperature is 80 ℃ and the drying time is 6 h.
As a further improvement of the invention, in the step (2), the reaction temperature is 170-190 ℃, and the reaction time is 24-26 h.
Compared with the prior art, the invention has the following technical effects:
the invention prepares WO by a one-step hydrothermal synthesis method3-Bi2WO6Composite gas-sensitive material of nano-sheet assembled hierarchical structure, WO3-Bi2WO6The hierarchical structure presents a spherical shape, the average diameter of the hierarchical structure is about 1.5 mu m, the final shape and structure of a product are changed by successfully introducing tungsten trioxide, the nanosheets are converted into the spherical hierarchical structure assembled by the nanosheets, the microscopic shape and the specific surface area of the material are improved, the gas-sensitive performance of the material is effectively enhanced, the preparation method is simple, convenient and safe, the cost is low, the practicability is high, and the application of the hierarchical structure is that the WO is used for preparing the nano-material3-Bi2WO6Room temperature gas sensor as gas sensitive layer, which is used for H at room temperature2S gas exhibits good gas-sensitive properties including an extremely low detection limit (2 ppb) and is sensitive to low concentrations of H2S has high selectivity and stability, and 50 ppb H2The response value of S is as high as 4.4 (R)a/Rg) (ii) a The gas-sensitive material prepared by the invention can be applied to the safety monitoring of industrial production environment, and can also be used as an optimal new material for nondestructive diagnosis of respiratory gas and freshness evaluation of agricultural products.
Drawings
FIG. 1 is x wt% WO3-Bi2WO6(x = 20, 30, 40) SEM image of the composite material, wherein (a) is20wt% WO3-Bi2WO6(b) 30wt% WO3-Bi2WO6(c) 40wt% WO3-Bi2WO6。
FIG. 2 is 20wt% WO prepared in example 23- Bi2WO6HRTEM and elemental distribution plots of (g).
FIG. 3 is a schematic structural diagram of a test platform according to the present invention.
FIG. 4 is x wt% WO3- Bi2WO6(x =0, 10, 20, 30, 40) gas sensor pair 50 ppb H2S response curve.
FIG. 5 shows 20wt% WO3- Bi2WO6Selectivity (a) and cycle stability (b) profiles of gas sensors.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A room-temperature low-concentration hydrogen sulfide gas sensitive material comprises a bismuth tungstate popcorn hierarchical structure and tungsten trioxide nanoparticles, wherein the tungsten trioxide nanoparticles are loaded on the surface of the bismuth tungstate popcorn hierarchical structure, and the mass percentage of the tungsten trioxide nanoparticles is 10% -40%.
The method for preparing the room-temperature low-concentration hydrogen sulfide gas-sensitive material comprises the following steps:
(1) dissolving bismuth nitrate pentahydrate, sodium tungstate dihydrate and sodium hexadecylbenzene sulfonate in a certain molar ratio in deionized water at room temperature, and magnetically stirring to obtain a uniformly mixed solution;
(2) transferring the mixed solution into a stainless steel high-pressure reaction kettle, sealing, reacting for a period of time at a certain temperature, naturally cooling to room temperature after the reaction is finished, and sequentially centrifuging, washing and drying to obtain a final product;
in the step (2), the drying temperature is 80 ℃, the drying time is 6 hours, the reaction temperature is 170-.
In order to prepare the low-concentration hydrogen sulfide gas-sensitive material, the molar ratio of bismuth nitrate pentahydrate to sodium tungstate dihydrate is 2 mmol: 1+ x mmol, wherein x = 0.5-2.0; the molar mass of the sodium hexadecyl benzene sulfonate is 0.9-0.11 mmol, and the molar mass of the sodium hexadecyl benzene sulfonate is preferably 0.1 mmol as a surfactant and a structure directing agent simultaneously.
Compared with the prior art, the invention has the following technical effects:
the invention prepares WO by a one-step hydrothermal synthesis method3-Bi2WO6Composite gas-sensitive material of nano-sheet assembled hierarchical structure, WO3-Bi2WO6The hierarchical structure presents a spherical shape, the average diameter of the hierarchical structure is about 1.5 mu m, the final shape and structure of a product are changed by successfully introducing tungsten trioxide, the nanosheets are converted into the spherical hierarchical structure assembled by the nanosheets, the microscopic shape and the specific surface area of the material are improved, the gas-sensitive performance of the material is effectively enhanced, the preparation method is simple, convenient and safe, the cost is low, the practicability is high, and the application of the hierarchical structure is that the WO is used for preparing the nano-material3-Bi2WO6Room temperature gas sensor as gas sensitive layer, which is used for H at room temperature2S gas exhibits good gas-sensitive properties including an extremely low detection limit (2 ppb) and is sensitive to low concentrations of H2S has high selectivity and stability; the gas-sensitive material prepared by the invention can be applied to the safety monitoring of industrial production environment, and can also be used as an optimal new material for nondestructive diagnosis of respiratory gas and freshness evaluation of agricultural products.
Example 1
The method for preparing the room-temperature low-concentration hydrogen sulfide gas-sensitive material comprises the following steps:
(1) at normal temperature, 0.97 g of Bi (NO)3)3·5H2O and 0.495 g Na2WO4·2H2Mixing O into 35 mL of deionized water, magnetically stirring for 1 h to obtain a uniformly mixed and clarified solution, slowly adding 0.0348 g of SDBS into the solution, and magnetically stirring for 1 h to uniformly mix the solution;
(2) transferring the mixed solution obtained in the step (1) into a 50 mL stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, sealing, keeping at 180 ℃ for 24 h, naturally cooling to room temperature after the reaction is finished, centrifuging, washing, and drying the product at 80 ℃ for 6 h to obtain 10wt% WO3- Bi2WO6A hierarchical composite gas sensitive material.
Adding deionized water into the powder prepared in the step (2) and grinding the powder to form paste, uniformly coating the paste on the outer surface of the sensor substrate, completely covering a platinum electrode, drying the paste at room temperature for 30 min to form a gas-sensitive coating, moving the gas-sensitive coating to an aging table, and standing the gas-sensitive coating for 24 h at 120 ℃ to obtain 10wt% of WO3 - Bi2WO6A room temperature gas sensor.
The prepared gas sensitive element is tested by using the test platform shown in fig. 3, the flow rates of high-purity air and target gas are respectively controlled by two gas mass flowmeters to obtain target gas with different concentrations, the test contents are respectively introduced into the sensor test device, the sensor test device tests the real-time resistance change condition, the sensitivity is calculated, and after the test, as shown in fig. 4, the low-concentration H gas is tested under the room temperature condition2And S has poor gas-sensitive performance and almost no response.
Example 2
The method for preparing the room-temperature low-concentration hydrogen sulfide gas-sensitive material comprises the following steps:
(1) at normal temperature, 0.97 g of Bi (NO)3)3·5H2O and 0.66 g Na2WO4·2H2Mixing O into 35 mL of deionized water, magnetically stirring for 1 h to obtain a uniformly mixed and clarified solution, slowly adding 0.0348 g of SDBS into the solution, and magnetically stirring for 1 h to uniformly mix the solution;
(2) transferring the mixed solution obtained in the step (1) into a 50 mL stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, sealing, keeping at 180 ℃ for 24 h, naturally cooling to room temperature after the reaction is finished, centrifuging, washing, and drying the product at 80 ℃ for 6 h to obtain 20wt% WO3- Bi2WO6The nano structure and element distribution of the composite gas-sensitive material with the hierarchical structure are shown in FIG. 2.
Adding deionized water into the powder prepared in the step (2) to grind to form paste, and then uniformly coating the paste on a sensorCompletely covering the platinum electrode on the outer surface of the substrate, drying at room temperature for 30 min to form a gas-sensitive coating, transferring to an aging table, standing at 120 deg.C for 24 h to obtain 20wt% WO3- Bi2WO6A room temperature gas sensor.
The prepared gas sensor was tested, as shown in FIGS. 4 and 5, and the sensor was used for 50 ppb H at room temperature2The response value of S is 4.4, and the selectivity and the repeatability are also excellent.
Example 3
The method for preparing the room-temperature low-concentration hydrogen sulfide gas-sensitive material comprises the following steps:
(1) at normal temperature, 0.97 g of Bi (NO)3)3·5H2O and 0.824 g Na2WO4·2H2O was mixed into 35 mL of deionized water and after magnetic stirring for 1 h a well mixed and clear solution was obtained. Slowly adding 0.0348 g of SDBS into the solution, and magnetically stirring for 1 h until the solution is uniformly mixed;
(2) transferring the mixed solution obtained in the step (1) into a 50 mL stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, sealing, keeping at 180 ℃ for 24 h, naturally cooling to room temperature after the reaction is finished, centrifuging, washing, and drying the product at 80 ℃ for 6 h to obtain 30wt% WO3- Bi2WO6A hierarchical composite gas sensitive material.
Adding deionized water into the powder prepared in the step (2) to grind to form paste, uniformly coating the paste on the outer surface of the sensor substrate, completely covering the platinum electrode, drying at room temperature for 30 min to form a gas-sensitive coating, moving the gas-sensitive coating to an aging table, and standing at 120 ℃ for 24 h to obtain 30wt% of WO3- Bi2WO6The room temperature gas sensor is tested, and H is improved to a certain extent under room temperature conditions after the test2S gas sensitivity, as shown in FIG. 4, the sensor is sensitive to 50 ppb H at room temperature2The response value of S was 2.0.
Example 4
(1) At normal temperature, 0.97 g of Bi (NO)3)3·5H2O and 0.99 g Na2WO4·2H2Mixing O into 35 mL of deionized water, magnetically stirring for 1 h to obtain a uniformly mixed and clarified solution, slowly adding 0.0348 g of SDBS into the solution, and magnetically stirring for 1 h to uniformly mix the solution;
(2) transferring the mixed solution obtained in the step (1) into a 50 mL stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, sealing, keeping at 180 ℃ for 24 h, naturally cooling to room temperature after the reaction is finished, centrifuging, washing, and drying the product at 80 ℃ for 6 h to obtain 40wt% WO3- Bi2WO6A hierarchical composite gas sensitive material.
Adding deionized water into the powder prepared in the step (2) to grind to form paste, uniformly coating the paste on the outer surface of the sensor substrate, completely covering the platinum electrode, drying at room temperature for 30 min to form a gas-sensitive coating, moving the gas-sensitive coating to an aging table, and standing at 120 ℃ for 24 h to obtain 40wt% of WO3- Bi2WO6The room temperature gas sensor is tested and shows a certain degree of improved H under room temperature conditions2S gas sensitivity, as shown in FIG. 4, the sensor is sensitive to 50 ppb H at room temperature2The response value of S was 1.9.
From the above examples, it can be seen that when the mass percentage of tungsten trioxide in the gas-sensitive material is 20%, the gas-sensitive material exhibits the most excellent gas-sensitive performance at room temperature for low-concentration hydrogen sulfide, and 50 ppb H2The response value of S is as high as 4.4 (R)a/Rg) Wherein R isaIs an initial resistance value, RgThe resistance value of the gas-sensitive material after the hydrogen sulfide gas is introduced.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (7)
1. The room-temperature low-concentration hydrogen sulfide gas sensitive material is characterized by comprising a bismuth tungstate popcorn hierarchical structure and tungsten trioxide nanoparticles, wherein the tungsten trioxide nanoparticles are loaded on the surface of the bismuth tungstate popcorn hierarchical structure.
2. The room-temperature low-concentration hydrogen sulfide gas-sensitive material as claimed in claim 1, wherein the mass percentage of the tungsten trioxide nanoparticles is 10% -40%.
3. A method for preparing a room temperature low concentration hydrogen sulfide gas sensitive material according to claim 1 or 2, comprising the steps of:
(1) dissolving bismuth nitrate pentahydrate, sodium tungstate dihydrate and sodium hexadecylbenzene sulfonate in a certain molar ratio in deionized water at room temperature, and magnetically stirring to obtain a uniformly mixed solution;
(2) and transferring the mixed solution into a stainless steel high-pressure reaction kettle, sealing, reacting for a period of time at a certain temperature, naturally cooling to room temperature after the reaction is finished, and sequentially centrifuging, washing and drying to obtain a final product.
4. The room-temperature low-concentration hydrogen sulfide gas-sensitive material and the preparation method thereof as claimed in claim 3, wherein the molar ratio of bismuth nitrate pentahydrate to sodium tungstate dihydrate is 2 mmol: 1+ x mmol, wherein x = 0.5-2.0.
5. The room-temperature low-concentration hydrogen sulfide gas-sensitive material and the preparation method thereof as claimed in claim 1, wherein the molar mass of the sodium hexadecylbenzene sulfonate is 0.09-0.11 mmol.
6. The room-temperature low-concentration hydrogen sulfide gas-sensitive material and the preparation method thereof as claimed in claim 1, wherein in the step (2), the drying temperature is 80 ℃ and the drying time is 6 h.
7. The room-temperature low-concentration hydrogen sulfide gas-sensitive material and the preparation method thereof as claimed in claim 1, wherein in the step (2), the reaction temperature is 170-190 ℃ and the reaction time is 24-26 h.
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