CN102617125A - CO2 gas sensing material as well as preparation method and application thereof - Google Patents
CO2 gas sensing material as well as preparation method and application thereof Download PDFInfo
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- CN102617125A CN102617125A CN2012100528456A CN201210052845A CN102617125A CN 102617125 A CN102617125 A CN 102617125A CN 2012100528456 A CN2012100528456 A CN 2012100528456A CN 201210052845 A CN201210052845 A CN 201210052845A CN 102617125 A CN102617125 A CN 102617125A
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Abstract
The invention relates to CO2 gas sensing material as well as a preparation method and the application thereof. The ingredient of the CO2 gas sensing material can be expressed as La1-xAxFeO3, wherein, A refers to one or two elements of Ba, Sr and Ca, and x is more than or equals to 0 and is less than or equals to 0.4. The CO2 gas sensing material takes citric acid and one or two of lanthanum nitrate or iron nitrate or calcium nitrate or barium nitrate or strontium nitrate as raw materials, adopts a sol-gel method to synthesize precursors, and obtains La1-xAxFeO3 powder material through drying, annealing, grinding and re-annealing. The CO2 gas sensing material can be used as a thick film-type CO2 gas sensing element, and can also be used as a ceramic tube filling-type thick film-type CO2 gas sensing element. The CO2 gas sensing material achieves high gas sensing sensitivity on CO2 gas, achieves wide application and simple manufacture process, and is easy to control the preparation conditions.
Description
Technical field
The present invention relates to the sensing material technical field, particularly a kind of CO
2Gas sensitive.
Background technology
Human exhalation CO
2, under the automobile that seals, submarine, aircraft, space vehicles, need determine CO
2Concentration, with timely startup air exchange system.CO in addition
2In the quenching of making bicarbonate of ammonia, sodium bicarbonate, soda ash, urea, white lead pigment, beverage, flash arrestor, steel casting, use, also need CO
2Gas sensor or monitor are controlled CO
2Concentration.CO also often need be controlled in the fruits and vegetables warehouse
2Concentration.So exploitation CO
2Be very necessary.
Present infrared absorption type transmitter, CO
2Electrochemistry Severinghaus electrode sensor all is not suitable for generally using, and NASICON solid electrolyte type CO
2Also because processing requirement is very harsh, actual manufacture difficulty is big for transmitter, has therefore increased cost.Resistor-type CO
2Gas sensitive is generally with CuO-BaTiO
3Matrix material or mix silver CuO-BaTiO
3Matrix material is main, and this matrix material is because relate to CuO, BaTiO
3Two types of materials, processing requirement are also complicated.In addition, BaTiO
3Become the phase temperature high, CuO-BaTiO
3Matrix material CO
2The optimal working temp of gas sensor is also up to more than 400 ℃.
Summary of the invention
The object of the invention is exactly for shortcomings such as the complicated process of preparation that solves the prior art existence, working temperature height, and designs a kind of new iron-based La
1-xA
xFeO
3Nanocrystalline CO
2Gas sensitive, and provided preparation method and application.
The present invention is realized by following technical scheme: this CO
2The general formula of gas sensitive is La
1-xA
xFeO
3, wherein A is one or both in Ba, Sr, the Ca element, 0≤x≤0.4.
The present invention gives La
1-xA
xFeO
3The preparation method, concrete steps are following:
(1) when x=0, presses LaFeO
3Stoichiometric ratio takes by weighing Lanthanum trinitrate respectively, and iron nitrate is dissolved in the deionized water, is mixed with the solution of 0.5～1mol/L; When 0＜x≤0.4, press La
1-xA
xFeO
3Stoichiometric ratio takes by weighing Lanthanum trinitrate respectively, one or both of nitrate of baryta or nitrocalcite or strontium nitrate, and iron nitrate is dissolved in the deionized water, is mixed with the solution of 0.5～1mol/L;
(2) taking by weighing mol ratio with gas sensitive is 1～3 Hydrocerol A, is dissolved in the deionized water, after the solution that is mixed with 0.5～1mol/L is treated to dissolve fully, will more than various solution mix;
(3) under 50～90 ℃ of conditions, heated while stirring 12～48 hours, make colloidal sol;
(4) colloidal sol is put into baking oven, drying is 2～20 hours under 80～120 ℃, obtains gel;
(5) gel is placed 300～500 ℃ of lehres, annealed 2～5 hours, naturally cooling grinds cooled material 10～30 minutes, obtains powder;
(6) the material powder after will grinding was annealed 2～6 hours in 600～1100 ℃ of air, and naturally cooling obtains material La
1-xA
xFeO
3
The La that obtains according to the inventive method
1-xA
xFeO
3Material is the calcium titanium ore structure phase, and this phase thermal stability is good.Gas sensitive is not only relevant with prescription, and relevant with the powder annealing after grinding, and temperature is higher than 1100 ℃, and crystal grain is bigger, is lower than 600 ℃, and the crystallization of uhligite phase is relatively poor, and is unfavorable to air-sensitive performance.
The invention provides a kind of CO
2The application of gas sensitive is with CO of the present invention
2Gas sensitive is as thick-film type CO
2Gas sensor.Thick-film type CO
2The preparation of gas sensor mark ratio by weight is by 32～44 parts of CO
2Gas sensitive, 1～3 part of glass powder and 55～65 parts of Terpineol 350s mix sizes mixing, and is printed on the Al for preparing electrode
2O
3On the substrate, and under 80～120 ℃, dried 10～30 minutes, annealed 1～2 hour down at 600～800 ℃ at last, make CO
2The thick film gas-sensitive device.
The invention provides another kind of CO
2Gas sensitive La
1-xA
xFeO
3Application, with CO of the present invention
2Gas sensitive is as vitrified pipe filled CO
2Gas sensor.Vitrified pipe filled CO
2The preparation of gas sensor mark ratio by weight is by 85～90 parts of CO
2Gas sensitive, 10～15 parts of Terpineol 350s mix, and are filled in the vitrified pipe for preparing electrode, anneal 2～4 hours down at 550～650 ℃.
The invention has the beneficial effects as follows CO of the present invention
2Gas sensitive and prior art CO
2Gas sensitive is compared, and technology is simple, and preparation condition is easy to control, and to CO
2The air-sensitive of gas is highly sensitive.
Embodiment
Embodiment 1:
Take by weighing the Hydrocerol A of 0.1mol Lanthanum trinitrate, 0.1mol iron nitrate and 0.1mol; Be dissolved in respectively in the deionized water, be mixed with the solution of 0.5mol/L, after treating to dissolve fully, several solns is mixed; Under 50 ℃ of conditions, stirred 48 hours the colloidal sol of system; Colloidal sol is put into baking oven, descended 20 dry hours, obtain gel at 80 ℃; Gel is placed 300 ℃ of lehres, annealed 5 hours, ground 10 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 600 ℃ of lehres once more, annealed 6 hours, obtain powder material LaFeO
3
LaFeO with gained
3Material mixes by mass ratio with Terpineol 350 at 85: 15, and Al packs into
2O
3Vitrified pipe, and 550 ℃ annealing 4 hours, make CO
2The gas sensitive device.Prepared CO
2The gas sensitive element is under 320 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 1.12 and 1.25.
Embodiment 2:
Take by weighing the Hydrocerol A of 0.06mol Lanthanum trinitrate, 0.04 nitrate of baryta, 0.1mol iron nitrate and 0.3mol; Be dissolved in respectively in the deionized water, be mixed with the solution of 1mol/L, after treating to dissolve fully, several solns is mixed; Under 90 ℃ of conditions, stirred 12 hours the colloidal sol of system; Colloidal sol is put into baking oven, and drying is 2 hours under 120 ℃, obtains gel; Gel is placed 500 ℃ of lehres, annealed 2 hours, ground 30 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 1100 ℃ of lehres once more, annealed 2 hours, obtain powder material La
0.6Ba
0.4FeO
3
La with gained
0.6Ba
0.4FeO
3Material mixes by mass ratio with Terpineol 350 at 90: 10, and Al packs into
2O
3Vitrified pipe, and under 650 ℃, annealed 2 hours, make CO
2The gas sensitive device.Prepared CO
2The gas sensitive element is under 320 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 1.15 and 1.2.
Embodiment 3:
Take by weighing the Hydrocerol A of 0.08mol Lanthanum trinitrate, 0.02mol nitrocalcite, 0.1mol iron nitrate and 0.2mol; Be dissolved in respectively in the deionized water, be mixed with the solution of 0.6mol/L, after treating to dissolve fully, several solns is mixed; Under 70 ℃ of conditions, stirred 20 hours the colloidal sol of system; Colloidal sol is put into baking oven, and drying is 5 hours under 110 ℃, obtains gel; Gel is placed 400 ℃ of lehres, annealed 3 hours, ground 20 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 800 ℃ of lehres once more, annealed 3 hours, obtain powder material La
0.8Ca
0.2FeO
3
La with gained
0.8Ca
0.2FeO
3Material mixes by mass ratio with Terpineol 350 at 86: 14, and Al packs into
2O
3Vitrified pipe, and under 600 ℃, annealed 3 hours, make CO
2The gas sensitive device.Prepared CO
2The gas sensitive element is under 320 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 1.27 and 1.41.
Embodiment 4:
Take by weighing the Hydrocerol A of 0.08mol Lanthanum trinitrate, 0.02mol strontium nitrate, 0.1mol iron nitrate and 0.3mol; Be dissolved in respectively in the deionized water, be mixed with the solution of 1mol/L, after treating to dissolve fully, several solns is mixed; Under 85 ℃ of conditions, stirred 30 hours the colloidal sol of system; Colloidal sol is put into baking oven, and drying is 7 hours under 100 ℃, obtains gel; Gel is placed 450 ℃ of lehres, annealed 4 hours, ground 25 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 800 ℃ of lehres once more, annealed 3 hours, obtain powder material La
0.8Sr
0.2FeO
3
La with gained
0.8Sr
0.2FeO
3Material mixes by mass ratio with Terpineol 350 at 87: 13, and Al packs into
2O
3Vitrified pipe, and under 600 ℃, annealed 2 hours, make CO
2The gas sensitive device.Prepared CO
2The gas sensitive element is under 380 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 1.25 and 1.36.
Embodiment 5:
Take by weighing the Hydrocerol A of 0.075mol Lanthanum trinitrate, 0.025mol nitrate of baryta, 0.1mol iron nitrate and 0.1mol; Be dissolved in respectively in the deionized water, be mixed with the solution of 1mol/L, after treating to dissolve fully, several solns is mixed; Under 75 ℃ of conditions, stirred 35 hours the colloidal sol of system; Colloidal sol is put into baking oven, and drying is 10 hours under 95 ℃, obtains gel; Gel is placed 350 ℃ of lehres, annealed 5 hours, ground 15 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 800 ℃ of lehres once more, annealed 3 hours, obtain powder material La
0.75Ba
0.25FeO
3
La with gained
0.75Ba
0.25FeO
3Material mixes by mass ratio with Terpineol 350 at 89: 11, and Al packs into
2O
3Vitrified pipe, and under 600 ℃, annealed 2 hours, make CO
2The gas sensitive device.Prepared CO
2The gas sensitive element is under 100 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 3.2 and 3.5.
Embodiment 6:
Take by weighing the Hydrocerol A of 0.065mol Lanthanum trinitrate, 0.035mol nitrocalcite, 0.1mol iron nitrate and 0.25mol; Be dissolved in respectively in the deionized water, be mixed with the solution of 1mol/L, after treating to dissolve fully, several solns is mixed; Under 60 ℃ of conditions, stirred 25 hours the colloidal sol of system; Colloidal sol is put into baking oven, and drying is 3 hours under 115 ℃, obtains gel; Gel is placed 400 ℃ of lehres, annealed 2 hours, ground 30 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 820 ℃ of lehres once more, annealed 4 hours, obtain powder material La
0.65Ca
0.35FeO
3
La with gained
0.65Ca
0.35FeO
3Material mixes by mass ratio with Terpineol 350 at 88: 12, and Al packs into
2O
3Vitrified pipe, and under 600 ℃, annealed 2 hours, make CO
2The gas sensitive device.Prepared CO
2The gas sensitive element is under 320 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 1.51 and 2.13.
Embodiment 7:
Take by weighing the Hydrocerol A of 0.07mol Lanthanum trinitrate, 0.03mol strontium nitrate, 0.1mol iron nitrate and 0.15mol; Be dissolved in respectively in the deionized water, be mixed with the solution of 1mol/L, after treating to dissolve fully, several solns is mixed; Under 65 ℃ of conditions, stirred 30 hours the colloidal sol of system; Colloidal sol is put into baking oven, and drying is 15 hours under 90 ℃, obtains gel; Gel is placed 300 ℃ of lehres, annealed 3 hours, ground 25 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 1000 ℃ of lehres once more, annealed 2.5 hours, obtain powder material La
0.7Sr
0.3FeO
3
La with gained
0.7Sr
0.3FeO
3Material mixes by mass ratio with Terpineol 350 at 87: 13, and Al packs into
2O
3Vitrified pipe, and under 600 ℃, annealed 2 hours, make CO
2The gas sensitive device.Prepared CO
2The gas sensitive element is under 320 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 1.15 and 1.29.
Embodiment 8:
Take by weighing 0.075mol Lanthanum trinitrate, 0.025mol strontium nitrate, 0.1mol iron nitrate and 0.2mol Hydrocerol A; Be dissolved in respectively in the deionized water, be mixed with the solution of 1mol/L, after treating to dissolve fully, four kinds of solution are mixed; Under 70 ℃ of conditions, stirred 20 hours the colloidal sol of system; Colloidal sol is put into baking oven, and drying is 4 hours under 115 ℃, obtains gel; Gel is placed 350 ℃ of lehres, annealed 4 hours, ground 30 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 850 ℃ of lehres once more, annealed 5 hours, obtain powder material La
0.75Sr
0.25FeO
3
La with gained
0.75Sr
0.25FeO
3Material, frit, Terpineol 350 are pressed mass ratio and are mixed at 32: 3: 65, are printed on the Al for preparing electrode
2O
3On the substrate, and under 80 ℃, dried 30 minutes, annealed 2 hours down at 600 ℃ at last, make CO
2The thick film gas-sensitive device.Prepared CO
2The gas sensitive element is under 140 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 1.41 and 1.63.
Embodiment 9:
Take by weighing 0.095mol Lanthanum trinitrate, 0.005mol nitrate of baryta, 0.1mol iron nitrate and 0.3mol Hydrocerol A; Be dissolved in respectively in the deionized water, be mixed with the solution of 1mol/L, after treating to dissolve fully, four kinds of solution are mixed; Under 85 ℃ of conditions, stirred 20 hours the colloidal sol of system; Colloidal sol is put into baking oven, and drying is 6 hours under 100 ℃, obtains gel; Gel is placed 450 ℃ of lehres, annealed 3 hours, ground 25 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 850 ℃ of lehres once more, annealed 3 hours, obtain powder material La
0.95Ba
0.05FeO
3
La with gained
0.95Ba
0.05FeO
3Material, frit, Terpineol 350 are pressed mass ratio and are mixed at 44: 1: 55, grind 20 minutes, mix with an amount of Terpineol 350, size mixing, and are printed on the Al for preparing electrode
2O
3On the substrate, and under 120 ℃, dried 10 minutes, annealed 1 hour down at 800 ℃ at last, make CO
2The thick film gas-sensitive device.Prepared CO
2The gas sensitive element is under 140 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 1.27 and 1.45.
Embodiment 10:
Take by weighing 0.085mol Lanthanum trinitrate, 0.015mol nitrocalcite, 0.1mol iron nitrate and 0.15mol Hydrocerol A; Be dissolved in respectively in the deionized water, be mixed with the solution of 1mol/L, after treating to dissolve fully, four kinds of solution are mixed; Under 70 ℃ of conditions, stirred 25 hours the colloidal sol of system; Colloidal sol is put into baking oven, and drying is 5 hours under 110 ℃, obtains gel; Gel is placed 400 ℃ of lehres, annealed 5 hours, ground 30 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 850 ℃ of lehres once more, annealed 4 hours, obtain powder material La
0.85C
0.15AFeO
3
La with gained
0.85Ca
0.15FeO
3Material, frit, Terpineol 350 are pressed mass ratio and are mixed at 35: 2: 63, grind 20 minutes, mix with an amount of Terpineol 350, size mixing, and are printed on the Al for preparing electrode
2O
3On the substrate, and under 100 ℃, dried 20 minutes, annealed 2 hours down at 700 ℃ at last, make CO
2The thick film gas-sensitive device.Prepared CO
2The gas sensitive element is under 150 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 1.16 and 1.26.
Embodiment 11:
Take by weighing 0.095mol Lanthanum trinitrate, 0.002mol nitrate of baryta, 0.003mol nitrocalcite, 0.1mol iron nitrate and 0.3mol Hydrocerol A; Be dissolved in respectively in the deionized water, be mixed with the solution of 1mol/L, after treating to dissolve fully, four kinds of solution are mixed; Under 75 ℃ of conditions, stirred 20 hours the colloidal sol of system; Colloidal sol is put into baking oven, and drying is 6 hours under 100 ℃, obtains gel; Gel is placed 460 ℃ of lehres, annealed 3.5 hours, ground 25 minutes in agate mortar the cooling back, obtains powder; Material powder after grinding is put into 920 ℃ of lehres once more, annealed 4 hours, obtain powder material La
0.95Ba
0.02Ca
0.03FeO
3
La with gained
0.95Ba
0.02Ca
0.03FeO
3Material, frit, Terpineol 350 are pressed mass ratio and are mixed at 40: 2: 58, grind 20 minutes, mix with an amount of Terpineol 350, size mixing, and are printed on the Al for preparing electrode
2O
3On the substrate, and under 90 ℃, dried 15 minutes, annealed 1.5 hours down at 700 ℃ at last, make CO
2The thick film gas-sensitive device.Prepared CO
2The gas sensitive element is under 150 ℃, at the CO of 2000ppm and 4000ppm
2Sensitivity S=R in the gas
g/ R
aBe respectively 1.27 and 1.55.
Though above-mentioned specific embodiments of the invention is described; But be not restriction to protection domain of the present invention; One of ordinary skill in the art should be understood that; On the basis of technical scheme of the present invention, those skilled in the art need not pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. CO
2Gas sensitive is characterized in that, CO
2The general formula of gas sensitive is La
1-xA
xFeO
3, wherein A is one or both in Ba, Sr, the Ca element, 0≤x≤0.4.
2. CO as claimed in claim 1
2The preparation method of gas sensitive comprises the steps:
(1) when x=0, presses LaFeO
3Stoichiometric ratio takes by weighing Lanthanum trinitrate respectively, and iron nitrate is dissolved in the deionized water, is mixed with the solution of 0.5～1mol/L; When 0＜x≤0.4, press La
1-xA
xFeO
3Stoichiometric ratio takes by weighing Lanthanum trinitrate respectively, one or both of nitrate of baryta or nitrocalcite or strontium nitrate, and iron nitrate is dissolved in the deionized water, is mixed with the solution of 0.5～1mol/L;
(2) taking by weighing mol ratio with gas sensitive is 1～3 Hydrocerol A, is dissolved in the deionized water, after the solution that is mixed with 0.5～1mol/L is treated to dissolve fully, will more than various solution mix;
(3) under 50～90 ℃ of conditions, heated while stirring 12～48 hours, make colloidal sol;
(4) colloidal sol is put into baking oven, drying is 2～20 hours under 80～120 ℃, obtains gel;
(5) gel is placed 300～500 ℃ of lehres, annealed 2～5 hours, naturally cooling grinds cooled material 10～30 minutes, obtains powder;
(6) the material powder after will grinding was annealed 2～6 hours in 600～1100 ℃ of air, and naturally cooling obtains material La
1-xA
xFeO
3
3. CO as claimed in claim 1
2Gas sensitive is made thick-film type CO
2The application of gas sensor.
4. CO as claimed in claim 3
2Gas sensitive is made thick-film type CO
2The application of gas sensor is characterized in that, said thick-film type CO
2The preparation of gas sensor mark ratio by weight is by 32～44 parts of CO
2Gas sensitive, 1～3 part of glass powder and 55～65 parts of Terpineol 350s mix sizes mixing, and is printed on the Al for preparing electrode
2O
3On the substrate, and under 80～120 ℃, dried 10～30 minutes, annealed 1～2 hour down at 600～800 ℃ at last, make CO
2The thick film gas-sensitive device.
5. one kind by CO as claimed in claim 1
2The thick-film type CO that gas sensitive is processed
2Gas sensor.
6. CO as claimed in claim 1
2Gas sensitive is made vitrified pipe filled CO
2The application of gas sensor.
7. CO as claimed in claim 6
2Gas sensitive is made vitrified pipe filled CO
2The application of gas sensor is characterized in that, said vitrified pipe filled CO
2The preparation of gas sensor mark ratio by weight is by 85～90 parts of CO
2Gas sensitive, 10～15 parts of Terpineol 350s mix, and are filled in the vitrified pipe for preparing electrode, anneal 2～4 hours down at 550～650 ℃.
8. one kind by CO as claimed in claim 1
2The vitrified pipe filled CO that gas sensitive is processed
2Gas sensor.
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| CN2012100528456A CN102617125A (en) | 2012-03-02 | 2012-03-02 | CO2 gas sensing material as well as preparation method and application thereof |
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| CN2012100528456A CN102617125A (en) | 2012-03-02 | 2012-03-02 | CO2 gas sensing material as well as preparation method and application thereof |
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| CN106119100A (en) * | 2016-07-07 | 2016-11-16 | 钟林超 | A kind of Fermentation type carbon dioxide generation device |
| CN108205002A (en) * | 2017-12-19 | 2018-06-26 | 太原理工大学 | A kind of high gas response and the LaFeO of selectivity3Base alcohol gas sensor element and preparation method thereof |
| CN109355704A (en) * | 2018-12-11 | 2019-02-19 | 西南科技大学 | A kind of gas-sensitive type LaCoO3The preparation method of epitaxial film |
| CN112009859A (en) * | 2020-08-24 | 2020-12-01 | 阿克苏优能农业科技股份有限公司 | Special mould-proof, dust-proof and fresh-keeping net bag for sugar-cored apples and preparation method thereof |
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| CN101162211A (en) * | 2007-11-23 | 2008-04-16 | 黑龙江大学 | Acetone air-sensitive material and uses thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106119100A (en) * | 2016-07-07 | 2016-11-16 | 钟林超 | A kind of Fermentation type carbon dioxide generation device |
| CN106119100B (en) * | 2016-07-07 | 2018-01-30 | 冯榕城 | A kind of Fermentation type carbon dioxide generation device |
| CN108205002A (en) * | 2017-12-19 | 2018-06-26 | 太原理工大学 | A kind of high gas response and the LaFeO of selectivity3Base alcohol gas sensor element and preparation method thereof |
| CN108205002B (en) * | 2017-12-19 | 2020-07-17 | 太原理工大学 | L aFeO with high gas response and selectivity3Ethanol-based gas sensor element and method for manufacturing same |
| CN109355704A (en) * | 2018-12-11 | 2019-02-19 | 西南科技大学 | A kind of gas-sensitive type LaCoO3The preparation method of epitaxial film |
| CN112009859A (en) * | 2020-08-24 | 2020-12-01 | 阿克苏优能农业科技股份有限公司 | Special mould-proof, dust-proof and fresh-keeping net bag for sugar-cored apples and preparation method thereof |
| CN112009859B (en) * | 2020-08-24 | 2022-05-17 | 阿克苏优能农业科技股份有限公司 | Special mould-proof, dust-proof and fresh-keeping net bag for sugar-cored apples and preparation method thereof |
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Application publication date: 20120801 |