CN105486724A - NO2 sensor based on precious metal Ag-supported mesoporous WO3 material and preparation method thereof - Google Patents

NO2 sensor based on precious metal Ag-supported mesoporous WO3 material and preparation method thereof Download PDF

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CN105486724A
CN105486724A CN201510812034.5A CN201510812034A CN105486724A CN 105486724 A CN105486724 A CN 105486724A CN 201510812034 A CN201510812034 A CN 201510812034A CN 105486724 A CN105486724 A CN 105486724A
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mesoporous
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precious metals
sensitive material
solution
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卢革宇
王莹麟
高原
孙鹏
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Jilin University
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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

Abstract

The invention provides a NO2 sensor based on a precious metal Ag-supported mesoporous WO3 material and a preparation method thereof, belonging to the technical field of semiconductor oxide gas sensors. The NO2 sensor is a sensitive material prepared by supporting a hard-template-process mesoporous WO3 material with the precious metal Ag. The sensor has effectively improved sensitivity to nitrogen dioxide due to usage of the great specific surface area of the mesoporous WO3 material and catalytic action of Ag on nitrogen dioxide. Moreover, a sensor structure adopted in the invention is composed of an Al2O3 insulating ceramic tube with two annular gold electrodes, a semiconductor sensitive material coating the annular gold electrodes and the Al2O3 insulating ceramic tube, and a nickel-chromium alloy heating coil threading through the Al2O3 insulating ceramic tube. The NO2 sensor is simple to prepare, small in size and suitable for mass production, so the NO2 sensor has wide application prospects in detection of the content of NO2 in a microenvironment.

Description

A kind of mesoporous WO based on supporting precious metals ag 3the NO of material 2sensor and preparation method
Technical field
The invention belongs to conductor oxidate gas sensor technical field, being specifically related to a kind of mesoporous WO based on supporting precious metals ag 3the NO of material 2gas sensor and preparation method thereof.
Background technology
The burning of coal can produce the toxic and harmful NO of a kind of serious harm environment and human body health 2, this gas also can cause the generation of nitric acid and nitrate and cause the formation of acid rain.Due to NO xtoxicity and destructive relatively serious, the therefore NO of high sensitivity and low-detection lower limit xthe exploitation of gas sensor seems particularly important.As everyone knows, electrochemical gas sensor, thermally conductive gas body sensor and semiconductor gas sensor are widely used this area.In the gas sensor of huge number, be that the resistor-type gas sensor of sensitive material has highly sensitive with conductor oxidate, the advantages such as Monitoring lower-cut is low, selectivity good, respond and resume speed is fast, all solid state, cost is lower are one of current most widely used gas sensors.
The aspect of performance that the micromechanism of sensitive material is improving gas sensor plays a part very important, utilizes silicon templated synthesis mesoporous material to improve material specific surface area, improves the method for material gas-sensitive property and be widely used.The material utilizing the method for this hard template to prepare all has the good network structure of crystallinity and good order structure.In addition, the surface of conductor oxidate supports noble metal and is subject to extensive concern to the method improving material air-sensitive performance, this method not only can reduce the working temperature of gas sensor, can also improve sensitivity and selectivity, and grow a lot potentiality in the modification of gas sensitive.
WO 3a kind of broad stopband n-type conductor oxidate, owing to there is outstanding sensitivity and selectivity is widely used in NO x, O 3and H 2the detection aspect of S.As n-type semiconductor oxide material, WO 3to NO xthere is higher sensitivity, adopt WO 3research work as the gas sensor of sensitive material has also been met the requirement of social application substantially by wide coverage, but, improve sensitivity, reduce WO in the working temperature of material 3also has very large research space.At present, based on mesoporous WO 3the nitrogen dioxide sensor supporting precious metals ag material rarely has report, but noble metal can be good at improving the sensitivity of material and reduces the working temperature of material, and in the modification of gas sensitive, application prospect is good, therefore to mesoporous WO 3the Research Significance supporting the nitrogen dioxide sensor of precious metals ag material is far-reaching.
Summary of the invention
The object of this invention is to provide a kind of mesoporous WO based on supporting precious metals ag 3nitrogen dioxide sensor of material and preparation method thereof.
Utilize the mesoporous WO supporting precious metals ag 3as sensitive material, cubic structure KIT-6 Template preparation is utilized to have the WO of mesoporous shape characteristic on the one hand 3material, increases its specific surface area; Precious metals ag is at WO on the other hand 3the surface of mesoporous material provides more reactivity site; In addition, Ag and WO 3to NO 2also have concerted catalysis effect, the acting in conjunction of this three aspect significantly improves the reaction efficiency of gas and sensitive material, and then improves the sensitivity of sensor.Meanwhile, commercially available tubular structure sensor manufacturing process of the present invention is simple, and volume is little, is beneficial to industrial batch production, therefore has important using value.
A kind of WO based on supporting precious metals ag 3the NO of mesoporous material 2gas sensor, by the Al of outside surface with 2 discrete annular gold electrodes 4 2o 3insulating ceramics pipe 1, through Al 2o 3the NI-G heater coil 3 of insulating ceramics pipe 1 inside and be coated in Al 2o 3sensitive material film 2 on insulating ceramics pipe 1 outside surface and annular gold electrode 4 is formed, and each annular gold electrode 4 is connected to a pair platinum filament 5, and sensitive material film 2 is by the mesoporous WO supporting precious metals ag 3gained after Material coating; The pore size of material is 9 ~ 10nm, has regular meso-hole structure, and the crystallinity of material is good, and precious metals ag major part is attached to inside, duct with simple substance form; This material is prepared by following steps:
1. be dissolved in absolute ethyl alcohol by phosphotungstic acid, stir until dissolve completely, forming concentration is the solution of 0.15 ~ 0.16g/mL;
2. adding in above-mentioned solution be the mesopore molecular sieve KIT-6 (one of porous silicon) of phosphotungstic acid quality 60 ~ 70% is hard template, then reacts 2 ~ 4 hours under 35 DEG C ~ 50 DEG C water bath condition, until ethanol volatilizees completely; The pressed powder obtained to be dried at 60 ~ 80 DEG C and at 250 ~ 300 DEG C of sintering processes 1 ~ 3h;
3. by step 1. in phosphotungstic acid quality consumption be kept to 40 ~ 60% of proper mass, by step 2. in hard template KIT-6 change whole sintered products that 2. step obtain into, sintering temperature is changed into 400 ~ 600 DEG C, other condition is constant, repeat step 1. with step 2.;
4. by step 1. in phosphotungstic acid quality consumption be kept to 20 ~ 30% of proper mass, by step 2. in hard template KIT-6 change whole sintered products that 3. step obtain into, sintering temperature is changed into 400 ~ 600 DEG C, other condition is constant, repeat step 1. with step 2.;
5. by step 1. in phosphotungstic acid quality consumption be kept to 10 ~ 15% of proper mass, by step 2. in hard template KIT-6 change whole sintered products that 4. step obtain into, sintering temperature is changed into 400 ~ 600 DEG C, other condition is constant, repeat step 1. with step 2.;
6. by step 3., step 4. or the sintered product that 5. obtains of step to be dissolved into concentration be in 2 ~ 4mol/L hydrofluoric acid solution, KIT-6 template is removed by stirred at ambient temperature for 2 ~ 3 hours, afterwards by the precipitate with deionized water of generation and ethanol eccentric cleaning, under 400 ~ 450 DEG C of conditions, sinter 1 ~ 2 hour again after drying under 60 ~ 80 DEG C of conditions, thus obtain the WO with meso-hole structure 3nano material powder;
The WO of the meso-hole structure 7. 6. step obtained 3nano material powder joins in ethanol, stirs and makes WO in 5 ~ 10 minutes 3nano material is uniformly dispersed, and then adds AgNO 3solution, stirs 5 ~ 10 minutes; AgNO 3consumption be WO 30.5 ~ 1.0mol% of nano material;
8. mixed solution step 7. obtained reacts 2 ~ 4 hours under 35 DEG C ~ 50 DEG C water bath condition, obtains the WO supporting precious metals ag at 60 ~ 80 DEG C after drying 3mesoporous material powder.
A kind of mesoporous WO based on supporting precious metals ag of the present invention 3the NO of material 2the preparation method of gas sensor, its step is as follows:
1. the mesoporous WO of precious metals ag will be supported 3material powder and deionized water in mass ratio 3 ~ 5:1 mix, and grinding forms pasty slurry, and the slurry that then takes a morsel is coated in the Al that commercially available outside surface carries 2 annular gold electrodes equably 2o 3ceramic pipe surface, forms 10 ~ 30 μm of thick sensitive material films, and makes sensitive material cover annular gold electrode completely; The length of ceramic pipe is 4 ~ 4.5mm, and external diameter is 1.2 ~ 1.5mm, and internal diameter is 0.8 ~ 1.0mm; The wide about 0.8 ~ 1.3mm of gold electrode, thick about 0.2 ~ 0.5mm, the spacing about 3.8 ~ 4.6mm of gold electrode.
2. by step 1. products obtained therefrom toast 30 ~ 45 minutes under infrared lamp, after sensitive material film drying, Al 2o 3ceramic pipe is calcined 2 ~ 3 hours at 400 ~ 450 DEG C; Then be that the nickel-cadmium heater coil of 30 ~ 40 Ω is through Al by resistance value 2o 3above-mentioned device, as heater strip, finally carries out welding and encapsulating according to general heater-type gas sensor by ceramic tube inside, thus obtains the mesoporous WO based on supporting precious metals ag 3the NO of material 2gas sensor.
Mesoporous WO prepared by the present invention 3the gas sensor supporting precious metals ag material has the following advantages:
1. utilize immersion method to prepare this sensitive material, synthetic method is simple, with low cost;
2. utilize hard template method to prepare mesoporous WO 3, preparation method is simple, has stable meso-hole structure, and material crystalline degree is good, effectively raises the specific surface area of material;
3. pass through at WO 3upper dipping AgNO 3solution, successfully makes noble metal be supported on mesoporous WO 3on, the combination of bi-material, improves NO 2sensitivity, reduce the optimum working temperature of material and there is good reversibility, detection NO 2content aspect has broad application prospects;
4. adopt commercially available tubular type sensor, device technology is simple, and volume is little, is suitable for producing in enormous quantities.
Accompanying drawing explanation
Fig. 1: the mesoporous WO supporting precious metals ag 3the TEM shape appearance figure of material, wherein the enlargement factor of (a) figure is 10000 times, and the enlargement factor of (b) figure is 20000 times;
Fig. 2: the mesoporous WO supporting precious metals ag 3the little angle figure of XRD of material;
Fig. 3: the mesoporous WO supporting precious metals ag 3the XRD wide-angle figure of material;
Fig. 4: the mesoporous WO supporting precious metals ag 3the structural representation of the nitrogen dioxide sensor of material;
Fig. 5: in comparative example and embodiment at sensor different operating temperature, NO 2concentration is the Sensitivity comparison figure under 1ppm;
Fig. 6: in comparative example and embodiment sensor under optimum working temperature to the NO of variable concentrations 2sensitivity comparison figure;
As shown in Figure 1, WO can be found out in (a) figure 3for ordered structure, pore size is 9 ~ 10nm, finds out that Ag simple substance is attached to WO in (b) figure 3in ordered structure;
As shown in Figure 2, the mesoporous WO of Ag is supported in figure 3with the mesoporous WO of non-Ag doped 3go out peak position identical, go out peak at (211) place sharp-pointed, illustrate that this bi-material has long-range order;
As shown in Figure 3, XRD spectra represents the mesoporous WO supporting Ag 3with WO 3base peak is completely corresponding and do not have other impurity peaks;
As shown in Figure 4, device is by Al 2o 3ceramic pipe 1, semiconductor sensitive material 2, nickel-cadmium heater coil 3, annular gold electrode 4 and platinum filament 5 form; The optimum working temperature of comparative example and embodiment is 75 DEG C, and now device is to 1ppmNO 2sensitivity be respectively 12 and 46;
As shown in Figure 5, when device is at NO 2gas concentration is under 1ppm, and the optimum working temperature of embodiment and comparative example is 75 DEG C;
As shown in Figure 6, when device at working temperature is 75 DEG C, the sensitivity of device is along with NO 2the increase of concentration and increasing, embodiment is to 100,200,300,500,700 and 1000ppbNO 2sensitivity be respectively 3,8,12,18,35 and 46, and comparative example is to 100 ~ 1000ppbNO 2sensitivity be only 2 ~ 12, wherein, sensitivity is the resistance value R of sensor in gas to be measured gwith aerial resistance value R aratio, be expressed as: S=R g/ R a.
Embodiment
Comparative example 1:
With mesoporous WO 3material makes heater-type NO as sensitive material 2sensor, its concrete manufacturing process:
1.5g phosphotungstic acid is dissolved in 10mL absolute ethyl alcohol by 1, stirs until dissolve completely, and forming concentration is the solution of 0.15g/mL;
The 2 mesopore molecular sieve KIT-6 adding 0.9g in above-mentioned solution are hard template, then react until ethanol obtains pressed powder after volatilizing completely under 40 DEG C of water bath condition; The pressed powder obtained to be dried at 80 DEG C and at 300 DEG C of sintering processes 2h, the product quality of sintering is about 2.3g;
The phosphotungstic acid of 0.75g is dissolved in 10mL absolute ethyl alcohol by 3, stirs until dissolve completely, and forming concentration is the solution of 0.075g/mL;
4 sintered products adding full income in step 2 in the solution of step 3 are template (about 2.3g), then react until ethanol obtains pressed powder after volatilizing completely under 40 DEG C of water bath condition; The pressed powder obtained to be dried at 80 DEG C and at 600 DEG C of sintering processes 2h, the product quality of sintering is about 2.7g;
The phosphotungstic acid of 0.3g is dissolved in 10mL absolute ethyl alcohol by 5, stirs until dissolve completely, and forming concentration is the solution of 0.03g/mL;
6 sintered products adding full income in step 4 in the solution of step 5 are template (about 2.7g), then react until ethanol obtains pressed powder after volatilizing completely under 40 DEG C of water bath condition; The pressed powder obtained to be dried at 80 DEG C and at 600 DEG C of sintering processes 2h, the product quality of sintering is about 2.8g;
It is in 3mol/L hydrofluoric acid solution that 7 calcinated powder materials step 6 obtained are dissolved into concentration, KIT-6 template is removed by stirred at ambient temperature for 2 hours, afterwards by the precipitate with deionized water that generates and ethanol eccentric cleaning 6 times, calcine 2 hours under 450 DEG C of conditions again after 80 DEG C of dryings, thus obtain the WO with meso-hole structure 3nano material powder is about 1.9g;
8. take a morsel obtained sensitive material powder, and 5:1 instills deionized water in mass ratio, grinds to form pasty slurry.Then dip a small amount of slurry with brush and be coated in the Al that commercially available outside surface carries 2 annular gold electrodes equably 2o 3ceramic pipe surface, form 30 μm of thick sensitive material films, the length of ceramic pipe is 4mm, and external diameter is 1.2mm, and internal diameter is 0.8mm, and makes sensitive material cover annular gold electrode completely;
9. toast 30 minutes under infrared lamp, after sensitive material drying, Al 2o 3ceramic pipe is calcined 2 hours at 400 DEG C; Then be that the nickel-cadmium coil of 30 Ω is through Al by resistance value 2o 3above-mentioned device, as heater strip, finally carries out welding and encapsulating according to general heater-type gas sensor, thus obtains mesoporous WO by ceramic tube inside 3material makes heater-type NO as sensitive material 2sensor.
Embodiment 1:
Use mesoporous WO 3support precious metals ag material and make NO as sensitive material 2sensor, its concrete manufacturing process:
1.5g phosphotungstic acid is dissolved in 10mL absolute ethyl alcohol by 1, stirs until dissolve completely, and forming concentration is the solution of 0.15g/mL;
The 2 mesopore molecular sieve KIT-6 (one of porous silicon) adding 0.9g in above-mentioned solution are hard template, then react until ethanol obtains pressed powder after volatilizing completely under 40 DEG C of water bath condition; The pressed powder obtained to be dried at 80 DEG C and at 300 DEG C of sintering processes 2h, the product quality of sintering is about 2.3g;
The phosphotungstic acid of 0.75g is dissolved in 10mL absolute ethyl alcohol by 3, stirs until dissolve completely, and forming concentration is the solution of 0.075g/mL;
4 sintered products adding full income in step 2 in the solution of step 3 are template (about 2.3g), then react until ethanol obtains pressed powder after volatilizing completely under 40 DEG C of water bath condition; The pressed powder obtained to be dried at 80 DEG C and at 600 DEG C of sintering processes 2h, the product quality of sintering is about 2.7g;
The phosphotungstic acid of 0.3g is dissolved in 10mL absolute ethyl alcohol by 5, stirs until dissolve completely, and forming concentration is the solution of 0.03g/mL;
6 sintered products adding full income in step 4 in the solution of step 5 are template (about 2.7g), then react until ethanol obtains pressed powder after volatilizing completely under 40 DEG C of water bath condition; The pressed powder obtained to be dried at 80 DEG C and at 600 DEG C of sintering processes 2h, the product quality of sintering is about 2.8g;
It is in 3mol/L hydrofluoric acid solution that 7 calcinated powder materials step 6 obtained are dissolved into concentration, KIT-6 template is removed by stirred at ambient temperature for 2 hours, afterwards by the precipitate with deionized water that generates and ethanol eccentric cleaning 6 times, calcine 2 hours under 450 DEG C of conditions again after 80 DEG C of dryings, thus obtain the WO with meso-hole structure 3nano material powder is about 1.9g;
8. get above-mentioned mesoporous WO 3the powder of material joins in 20mL ethanolic solution, stirs and makes mesoporous WO in 10 minutes 3powder is dispersed in ethanolic solution completely, then adds WO 3the AgNO of the 0.5mol% of powder 3solution, stirs 10 minutes;
9. above-mentioned mixing material is placed in the water-bath of 45 DEG C, react 2 hours, the powder of the drying obtained is the WO supporting precious metals ag 3mesoporous material;
10. the mesoporous WO will obtained 3the powder supporting precious metals ag material and deionized water in mass ratio 5:1 mix, and grinding forms pasty slurry, then dips a small amount of slurry with brush and is coated in the Al that commercially available outside surface carries 2 annular gold electrodes equably 2o 3ceramic pipe surface, form 30 μm of thick sensitive material films, the length of ceramic pipe is 4mm, and external diameter is 1.2mm, and internal diameter is 0.8mm, and makes sensitive material cover annular gold electrode completely;
11. toast 3 minutes, after sensitive material drying, Al under infrared lamp 2o 3ceramic pipe is calcined 2 hours at 400 DEG C; Then be that the nickel-cadmium coil of 30 Ω is through Al by resistance value 2o 3above-mentioned device, as heater strip, finally carries out welding and encapsulating according to general heater-type gas sensor, thus obtains mesoporous WO by ceramic tube inside 3support the NO of precious metals ag material as sensitive material 2sensor.

Claims (2)

1. one kind based on the WO supporting precious metals ag 3the NO of mesoporous material 2gas sensor, by the Al of outside surface with 2 discrete annular gold electrodes (4) 2o 3insulating ceramics pipe (1), through Al 2o 3the NI-G heater coil (3) that insulating ceramics pipe (1) is inner and be coated in Al 2o 3sensitive material film (2) on insulating ceramics pipe (1) outside surface and annular gold electrode (4) is formed, and each annular gold electrode (4) is connected to a pair platinum filament (5); It is characterized in that: sensitive material film (2) is by the WO supporting precious metals ag 3gained after mesoporous material coating, and this material is prepared by following steps:
1. be dissolved in absolute ethyl alcohol by phosphotungstic acid, stir until dissolve completely, forming concentration is the solution of 0.15 ~ 0.16g/mL;
2. adding in above-mentioned solution be the mesopore molecular sieve KIT-6 of phosphotungstic acid quality 60 ~ 70% is hard template, then reacts 2 ~ 4 hours under 35 DEG C ~ 50 DEG C water bath condition, until ethanol volatilizees completely; The pressed powder obtained to be dried at 60 ~ 80 DEG C and at 250 ~ 300 DEG C of sintering processes 1 ~ 3h;
3. by step 1. in phosphotungstic acid quality consumption be kept to 40 ~ 60% of proper mass, by step 2. in hard template KIT-6 change whole sintered products that 2. step obtain into, sintering temperature is changed into 400 ~ 600 DEG C, other condition is constant, repeat step 1. with step 2.;
4. by step 1. in phosphotungstic acid quality consumption be kept to 20 ~ 30% of proper mass, by step 2. in hard template KIT-6 change whole sintered products that 3. step obtain into, sintering temperature is changed into 400 ~ 600 DEG C, other condition is constant, repeat step 1. with step 2.;
5. by step 1. in phosphotungstic acid quality consumption be kept to 10 ~ 15% of proper mass, by step 2. in hard template KIT-6 change whole sintered products that 4. step obtain into, sintering temperature is changed into 400 ~ 600 DEG C, other condition is constant, repeat step 1. with step 2.;
6. by step 3., step 4. or the sintered product that 5. obtains of step to be dissolved into concentration be in 2 ~ 4mol/L hydrofluoric acid solution, KIT-6 template is removed by stirred at ambient temperature for 2 ~ 3 hours, afterwards by the precipitate with deionized water of generation and ethanol eccentric cleaning, under 400 ~ 450 DEG C of conditions, sinter 1 ~ 2 hour again after drying under 60 ~ 80 DEG C of conditions, thus obtain the WO with meso-hole structure 3nano material powder;
The WO of the meso-hole structure 7. 6. step obtained 3nano material powder joins in ethanol, stirs and makes WO in 5 ~ 10 minutes 3nano material is uniformly dispersed, and then adds AgNO 3solution, stirs 5 ~ 10 minutes; AgNO 3consumption be WO 30.5 ~ 1.0mol% of nano material;
8. mixed solution step 7. obtained reacts 2 ~ 4 hours under 35 DEG C ~ 50 DEG C water bath condition, obtains the WO supporting precious metals ag at 60 ~ 80 DEG C after drying 3mesoporous material powder.
2. a kind of mesoporous WO based on supporting precious metals ag according to claim 1 3the NO of material 2the preparation method of gas sensor, its step is as follows:
1. the mesoporous WO of precious metals ag will be supported 3material powder and deionized water in mass ratio 3 ~ 5:1 mix, and grinding forms pasty slurry, and the slurry that then takes a morsel is coated in the Al that commercially available outside surface carries 2 annular gold electrodes equably 2o 3ceramic pipe surface, forms 10 ~ 30 μm of thick sensitive material films, and makes sensitive material cover annular gold electrode completely; The length of ceramic pipe is 4 ~ 4.5mm, and external diameter is 1.2 ~ 1.5mm, and internal diameter is 0.8 ~ 1.0mm;
2. by step 1. products obtained therefrom toast 30 ~ 45 minutes under infrared lamp, after sensitive material film drying, Al 2o 3ceramic pipe is calcined 2 ~ 3 hours at 400 ~ 450 DEG C; Then be that the NI-G heater coil of 30 ~ 40 Ω is through Al by resistance value 2o 3above-mentioned device, as heater strip, finally carries out welding and encapsulating according to general heater-type gas sensor by ceramic tube inside, thus obtains the mesoporous WO based on supporting precious metals ag 3the NO of material 2gas sensor.
CN201510812034.5A 2015-11-20 2015-11-20 NO2 sensor based on precious metal Ag-supported mesoporous WO3 material and preparation method thereof Pending CN105486724A (en)

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CN105784789A (en) * 2016-05-25 2016-07-20 吉林大学 NH3 sensor of mesoporous WO3 material based on supported precious metal Pt and preparation method of NH3 sensor
CN105866191A (en) * 2016-06-08 2016-08-17 吉林大学 Zr-doped mesoporous oxide indium nitrogen dioxide sensor based on pore passage order and preparation method thereof
CN106018480A (en) * 2016-05-13 2016-10-12 重庆理工大学 Indirectly-heated ammonia gas sensor and manufacturing method thereof
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CN108254416A (en) * 2018-01-02 2018-07-06 吉林大学 Meso-hole structure In is supported based on Au2O3The NO of nano sensitive material2Sensor, preparation method and applications
CN108572198A (en) * 2018-05-18 2018-09-25 南京工业大学 Nitric oxide gas sensitive and its application on preparing sensor
CN109115834A (en) * 2018-08-01 2019-01-01 华东师范大学 A kind of ppb grades of NO2Gas sheet type sensor and preparation method
CN113406155A (en) * 2021-06-23 2021-09-17 长春理工大学 Tin oxide/polyacid/tungsten oxide three-layer coaxial nanofiber gas sensing material and preparation method thereof
CN113916944A (en) * 2021-09-30 2022-01-11 北京化工大学 Nano graphite powder doped flower-like indium oxide material, preparation method and application thereof, and nitrogen dioxide gas sensor

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106018480A (en) * 2016-05-13 2016-10-12 重庆理工大学 Indirectly-heated ammonia gas sensor and manufacturing method thereof
CN106018480B (en) * 2016-05-13 2018-08-24 重庆理工大学 A kind of heater-type ammonia gas sensor and preparation method
CN105784789A (en) * 2016-05-25 2016-07-20 吉林大学 NH3 sensor of mesoporous WO3 material based on supported precious metal Pt and preparation method of NH3 sensor
CN105866191A (en) * 2016-06-08 2016-08-17 吉林大学 Zr-doped mesoporous oxide indium nitrogen dioxide sensor based on pore passage order and preparation method thereof
CN106124575A (en) * 2016-08-08 2016-11-16 苏州科技大学 A kind of NO2sensor and preparation method thereof
CN108254416A (en) * 2018-01-02 2018-07-06 吉林大学 Meso-hole structure In is supported based on Au2O3The NO of nano sensitive material2Sensor, preparation method and applications
CN108572198A (en) * 2018-05-18 2018-09-25 南京工业大学 Nitric oxide gas sensitive and its application on preparing sensor
CN109115834A (en) * 2018-08-01 2019-01-01 华东师范大学 A kind of ppb grades of NO2Gas sheet type sensor and preparation method
CN113406155A (en) * 2021-06-23 2021-09-17 长春理工大学 Tin oxide/polyacid/tungsten oxide three-layer coaxial nanofiber gas sensing material and preparation method thereof
CN113916944A (en) * 2021-09-30 2022-01-11 北京化工大学 Nano graphite powder doped flower-like indium oxide material, preparation method and application thereof, and nitrogen dioxide gas sensor

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Application publication date: 20160413