CN102071540A - Gas sensor fiber membrane and preparation method thereof - Google Patents
Gas sensor fiber membrane and preparation method thereof Download PDFInfo
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- CN102071540A CN102071540A CN2010105473821A CN201010547382A CN102071540A CN 102071540 A CN102071540 A CN 102071540A CN 2010105473821 A CN2010105473821 A CN 2010105473821A CN 201010547382 A CN201010547382 A CN 201010547382A CN 102071540 A CN102071540 A CN 102071540A
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- inorganic molecule
- electrostatic spinning
- organic polymer
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- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000000835 fiber Substances 0.000 title claims abstract description 11
- 239000012528 membrane Substances 0.000 title abstract 5
- 239000002657 fibrous material Substances 0.000 claims abstract description 17
- 238000010041 electrostatic spinning Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 12
- 238000007731 hot pressing Methods 0.000 claims abstract description 11
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 8
- 239000011118 polyvinyl acetate Substances 0.000 claims abstract description 8
- 229920001610 polycaprolactone Polymers 0.000 claims abstract description 6
- 239000004632 polycaprolactone Substances 0.000 claims abstract description 6
- 239000011780 sodium chloride Substances 0.000 claims abstract description 6
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims abstract description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 5
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 5
- YJGJRYWNNHUESM-UHFFFAOYSA-J triacetyloxystannyl acetate Chemical compound [Sn+4].CC([O-])=O.CC([O-])=O.CC([O-])=O.CC([O-])=O YJGJRYWNNHUESM-UHFFFAOYSA-J 0.000 claims abstract description 5
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000001639 calcium acetate Substances 0.000 claims abstract description 4
- 229960005147 calcium acetate Drugs 0.000 claims abstract description 4
- 235000011092 calcium acetate Nutrition 0.000 claims abstract description 4
- 238000003837 high-temperature calcination Methods 0.000 claims abstract description 4
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract 2
- 239000000243 solution Substances 0.000 claims description 20
- 229920000620 organic polymer Polymers 0.000 claims description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 6
- 235000002639 sodium chloride Nutrition 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims description 4
- -1 poly(ethylene oxide) Polymers 0.000 claims description 4
- 239000003021 water soluble solvent Substances 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000009987 spinning Methods 0.000 claims description 3
- 235000005074 zinc chloride Nutrition 0.000 claims description 3
- 239000011592 zinc chloride Substances 0.000 claims description 3
- 239000011368 organic material Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract 1
- 235000014121 butter Nutrition 0.000 abstract 1
- 229920001577 copolymer Polymers 0.000 abstract 1
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 abstract 1
- 239000004626 polylactic acid Substances 0.000 abstract 1
- 239000011701 zinc Substances 0.000 abstract 1
- 229910052725 zinc Inorganic materials 0.000 abstract 1
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 66
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 18
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 4
- 239000002086 nanomaterial Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 101150003085 Pdcl gene Proteins 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 230000012010 growth Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 1
- LXNAVEXFUKBNMK-UHFFFAOYSA-N acetic acid;palladium Chemical compound [Pd].CC(O)=O.CC(O)=O LXNAVEXFUKBNMK-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910021432 inorganic complex Inorganic materials 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The invention discloses a gas sensor fiber membrane and a preparation method. The gas sensor fiber membrane is formed by composite fiber materials through hot pressing, and the composite fiber consists of organic high molecules with the weight average molecular weight between 50 and 500 thousand and inorganic molecules, wherein the organic high molecules are selected from polyvinyl acetate, polyethylene oxide, polyvinyl alcohol, polylactic acid, polylactic acid-glycollic acid copolymers and polycaprolactone, the inorganic molecules are selected from tin acetate, palladium chloride, sodium chloride, calcium acetate and zinc butter, the organic high molecules and the inorganic molecules are mixed into electrostatic spinning solution after being respectively prepared into solution, then, the electrostatic spinning solution respectively carries out processes such as electrostatic spinning, hot pressing, high-temperature calcination and the like, and the gas sensor fiber membrane is prepared. The gas sensor fiber membrane has the characteristics of ultrahigh sensitivity and high selectivity, in addition, the microporous structure can be maintained at a high temperature, the preparation method is simple, the operation is easy, and the preparation method has wide application prospects in many fields.
Description
Technical field
The present invention relates to composite organic-inorganic material and preparation method thereof, more specifically, is a kind of sensor tunica fibrosa and preparation method thereof.
Background technology
Nano material, especially inorganic nano material are widely used in catalyst, and gas sensor, battery are particularly in solar cell and other technologies and new the application.The crystalline size of crystal type compound, crystal shape, surface area and porosity can exert far reaching influence to its functional characteristic, therefore, realize that the accurate control to these parameters is vital to development novel nano-material and nanometer technology.
It is very difficult wanting to keep little crystallite dimension and nano aperture, prevention grain growth under the high-temperature process condition and making its densification.Just about hundreds of degree centigrade, this is feasible higher to equipment and experimental requirements for the routine operation temperature of gas sensor and SOFC.Once the someone proposed the method for several inhibition grain growths and densification, and comprising the two-step sintering technology, molecule adds cap, in atresia template deposition, and hot water treatment and surface grafting organic molecule etc., but effect is all not satisfactory.Therefore, press for find a kind of under hot conditions the effective way of the stable non-porous structure of preparation.
Summary of the invention
The object of the invention be to provide a kind of highly sensitive, but selectivity is high and the gas sensor tunica fibrosa and preparation method thereof of stable maintenance microcellular structure at high temperature.
The present invention realizes by following technological means: can produce the organic or inorganic fiber at electrostatic spinning technique, and in the electrostatic spinning process, hydrolysis, condensation, the characteristics that reactions such as pregel can cause fibre morphology and micro-structural to change, by carrying out electrostatic spinning after organic polymer solution and the mixing of inorganic molecule solution, obtain complex fiber material, again through hot pressing and calcining, make the complex fiber material film forming, and organic principle is decomposed, the inorganic constituents oxidizing and crystallizing, form metal oxide nanoparticles, provide a kind of highly sensitive, but the gas sensor tunica fibrosa of high selectivity and stable maintenance microcellular structure, and whole preparation process is simple, and cost is low.
Gas sensor tunica fibrosa of the present invention, form by complex fiber material hot pressing, described composite fibre is that 5～500,000 organic polymer and inorganic molecule constitute by weight average molecular weight, wherein, described organic polymer is selected from polyvinyl acetate (PVAc), poly(ethylene oxide) (PEO), polyvinyl alcohol (PVA), PLA (PLA), polylactic-co-glycolic acid (PLGA) and polycaprolactone (PCL); Described inorganic molecule is selected from tin acetate (Sn (CH
3COO)
2), palladium bichloride (PdCl
2), sodium chloride (NaCl), calcium acetate (Ca (CH
3COO)
2), zinc chloride (ZnCl
2).
The method for preparing the gas sensor tunica fibrosa of the present invention comprises the steps:
(1) preparation organic polymer solution: the water-soluble or organic solvent with high-molecular organic material is mixed with mass percentage concentration and is 2～50% organic polymer solution;
Preferably, the pairing solvent of described macromolecular material is respectively: polyvinyl acetate (PVAc) is dissolved in dimethyl formamide (DMF); PEO is water-soluble; The mixed liquor of PVA water-soluble or acetone or water and acetone; PLA (PLA) is dissolved in the mixed liquor of dimethyl formamide (DMF) or dimethyl formamide (DMF) and acetone; Polylactic-co-glycolic acid (PLGA) is dissolved in the mixed liquor of dimethyl formamide (DMF) or dimethyl formamide (DMF) and acetone; Polycaprolactone (PCL) is dissolved in the mixed liquor of acetone or oxolane or acetone and dimethyl formamide (DMF).
(2) preparation inorganic molecule solution: the water-soluble or organic solvent with the inorganic molecule material is mixed with mass concentration and is 1～30% inorganic molecule solution;
Preferably, the pairing solvent of described inorganic molecule material is respectively: tin acetate (Sn (CH
3COO)
2) be dissolved in the mixed liquor of dimethyl formamide (DMF) and acetic acid; Palladium bichloride (PdCl
2) water-soluble or acetone; Water-soluble or the dimethyl formamide (DMF) of sodium chloride (NaCl); Calcium acetate (Ca (CH
3COO)
2) be dissolved in dimethyl formamide (DMF) or dimethyl sulfoxide (DMSO) (DMSO); Zinc chloride (ZnCl
2) be dissolved in the mixed liquor of dimethyl sulfoxide (DMSO) (DMSO) or dimethyl sulfoxide (DMSO) (DMSO) and water.
(3) preparation complex fiber material: described organic polymer solution and inorganic molecule solution mixed obtain electrostatic spinning liquid, and the classical device for spinning of injection single needle head, at voltage is 10～30KV, liquid inventory is 10～100 μ L/min, receiving range is to carry out electrostatic spinning under the condition of 5～25cm, the base material that utilization has the feature micro-structural receives, and obtains the complex fiber material that diameter is 50nm～500nm;
(4) hot pressing film forming: above-mentioned complex fiber material after 1～10 minute, 450～600 ℃ of following high-temperature calcinations 0.5～2 hour, is obtained the gas sensor tunica fibrosa 50～100 ℃ of following hot pressing with the preheating metallic plate.
Preferably, the base material with feature micro-structural for preparing the method employing of gas sensor tunica fibrosa of the present invention is selected from one or both in silica/silicon wafer and the aluminium oxide ceramics.
Prepare the gas sensor tunica fibrosa according to method of the present invention, utilize the method for electrostatic spinning to prepare the nanostructured complex fiber material, technology is simple, easy operating and cost are low, adopts different collection modes, can obtain having the organic/inorganic complex fiber material of different levels structure; In the electrostatic spinning process, the hydrolysis that takes place, condensation, reactions such as pregel can cause the change of fibre morphology and micro-structural, obtain complex fiber material, in follow-up calcination process, organic principle decomposes, the inorganic constituents oxidizing and crystallizing forms metal oxide nanoparticles, be present in the fiber, thereby cause the generation of highly porous structure, show the situation that nano-pore and relatively large hole diplopore exist side by side, this particular shape helps penetrating into of gas or liquid, thereby make to adopt the gas sensor of gas sensor tunica fibrosa preparation of the present invention have high sensitivity, and also can this microcellular structure of stable maintenance under hot conditions; By selection to inorganic molecule, can realize the high selectivity of gas sensor tunica fibrosa of the present invention, have wide practical use in fields such as catalyst, gas sensor, optical clear device and photoelectrochemical cells.
The specific embodiment
Below describe preferred implementation of the present invention, but be not in order to limit the present invention.
Embodiment 1:
Be prepared as follows the gas sensor tunica fibrosa:
(1) preparation organic polymer solution: 5g polyvinyl acetate (PVAc) is dissolved in dimethyl formamide (DMF), is mixed with mass percentage concentration and is 50% organic polymer solution;
(2) preparation inorganic molecule solution: 0.5g tin acetate, 0.5g palladium bichloride are dissolved in dimethyl formamide (DMF) and the mixed liquor that the acetone equal-volume mixes, are mixed with mass concentration and are 5% inorganic molecule solution;
(3) preparation complex fiber material: described organic polymer solution and inorganic molecule solution mixed obtain electrostatic spinning liquid, and the classical device for spinning of injection single needle head, at voltage is 13KV, by syringe pump control liquid inventory is 100 μ L/min, receiving range is to carry out electrostatic spinning under the condition of 15cm, silica/silicon wafer and aluminium oxide ceramics base material that employing has the feature micro-structural receive as substrate, obtain the complex fiber material that diameter is 200nm;
(4) hot pressing film forming: above-mentioned complex fiber material after 1 minute, 450～600 ℃ of following high-temperature calcinations 1 hour, is obtained the gas sensor tunica fibrosa 80 ℃ of following hot pressing with the preheating metallic plate.
Facts have proved that gas sensor tunica fibrosa of the present invention has is highly sensitive, the high characteristics of selecting, and can the stable maintenance microcellular structure under hot conditions, and preparation technology is simple, easy operating, cost are low.
Claims (3)
1. gas sensor tunica fibrosa, it is characterized in that, form by complex fiber material hot pressing, described composite fibre is that 5～500,000 organic polymer and inorganic molecule constitute by weight average molecular weight, wherein, described organic polymer is selected from polyvinyl acetate, poly(ethylene oxide), polyvinyl alcohol, PLA, polylactic-co-glycolic acid, polycaprolactone; Described inorganic molecule is selected from tin acetate, palladium bichloride, sodium chloride, calcium acetate, zinc chloride.
2. a method for preparing the described gas sensor tunica fibrosa of claim 1 is characterized in that, comprises the steps:
(1) preparation organic polymer solution: the water-soluble or organic solvent with high-molecular organic material is mixed with mass percentage concentration and is 2～50% organic polymer solution;
(2) preparation inorganic molecule solution: the water-soluble or organic solvent with the inorganic molecule material is mixed with mass concentration and is 1～30% inorganic molecule solution;
(3) preparation complex fiber material: described organic polymer solution and inorganic molecule solution mixed obtain electrostatic spinning liquid, and the classical device for spinning of injection single needle head, at voltage is 10～30KV, liquid inventory is 10～100 μ L/min, receiving range is to carry out electrostatic spinning under the condition of 5～25cm, the base material that utilization has the feature micro-structural receives, and obtains the complex fiber material that diameter is 50nm～500nm;
(4) hot pressing film forming: above-mentioned complex fiber material after 1～10 minute, 450～600 ℃ of following high-temperature calcinations 0.5～2 hour, is obtained the gas sensor tunica fibrosa 50～100 ℃ of following hot pressing with the preheating metallic plate.
3. the method for preparing the gas sensor tunica fibrosa according to claim 2 is characterized in that, described base material with feature micro-structural is selected from one or both in silica/silicon wafer and the aluminium oxide ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105473821A CN102071540A (en) | 2010-11-17 | 2010-11-17 | Gas sensor fiber membrane and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105473821A CN102071540A (en) | 2010-11-17 | 2010-11-17 | Gas sensor fiber membrane and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102071540A true CN102071540A (en) | 2011-05-25 |
Family
ID=44030288
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817178A (en) * | 2012-09-10 | 2012-12-12 | 北京化工大学 | Method for improving heat stability and mechanical property of polyvinyl alcohol nanofiber membrane |
| CN102965848A (en) * | 2012-11-15 | 2013-03-13 | 广州市香港科大霍英东研究院 | Nanometre porous ceramic film and preparation method thereof |
| CN103103634A (en) * | 2013-01-05 | 2013-05-15 | 浙江大学 | ZnFe2O4 nanoparticle-ZnO nanofiber composite nanomaterial for glucose color ratio sensing and preparation method thereof |
| CN103590132A (en) * | 2013-11-25 | 2014-02-19 | 扬州大学 | Preparation method for electrostatic spinning nano-fiber adopting porous structure |
| CN103644845A (en) * | 2013-12-20 | 2014-03-19 | 北京科技大学 | Nucleic acid modified nano fiber optical sensor and producing method thereof |
| CN105525441A (en) * | 2016-01-28 | 2016-04-27 | 华南理工大学 | Foldable multilayer cross-linked composite fiber net film as well as preparation method and application thereof |
| CN106065515A (en) * | 2016-08-04 | 2016-11-02 | 江阴金泰克生物技术有限公司 | A kind of method using electrostatic spinning technique to prepare artificial antibacterial repair membrane |
| CN106592108A (en) * | 2016-12-15 | 2017-04-26 | 清华大学 | Preparation method of flexible transparent conductive film, and obtained product |
| CN111188129A (en) * | 2020-01-16 | 2020-05-22 | 中国农业科学院农业信息研究所 | Ethylene sensor and preparation method of ethylene sensitive film |
| CN113325043A (en) * | 2021-07-19 | 2021-08-31 | 东北师范大学 | Flexible inorganic semiconductor resistance type room temperature gas sensor and preparation method thereof |
| CN114504951A (en) * | 2022-01-24 | 2022-05-17 | 华南理工大学 | A recyclable electret filter membrane and its preparation method, cleaning and charge regeneration method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817178A (en) * | 2012-09-10 | 2012-12-12 | 北京化工大学 | Method for improving heat stability and mechanical property of polyvinyl alcohol nanofiber membrane |
| CN102965848B (en) * | 2012-11-15 | 2016-06-22 | 广州市香港科大霍英东研究院 | A kind of nano-porous ceramic film and preparation method thereof |
| CN102965848A (en) * | 2012-11-15 | 2013-03-13 | 广州市香港科大霍英东研究院 | Nanometre porous ceramic film and preparation method thereof |
| CN103103634A (en) * | 2013-01-05 | 2013-05-15 | 浙江大学 | ZnFe2O4 nanoparticle-ZnO nanofiber composite nanomaterial for glucose color ratio sensing and preparation method thereof |
| CN103590132A (en) * | 2013-11-25 | 2014-02-19 | 扬州大学 | Preparation method for electrostatic spinning nano-fiber adopting porous structure |
| CN103590132B (en) * | 2013-11-25 | 2016-03-02 | 扬州大学 | A kind of preparation method of loose structure Electrospun nano-fibers |
| CN103644845A (en) * | 2013-12-20 | 2014-03-19 | 北京科技大学 | Nucleic acid modified nano fiber optical sensor and producing method thereof |
| CN103644845B (en) * | 2013-12-20 | 2016-06-08 | 北京科技大学 | Nanofiber optical pickocff that a kind of nucleic acid is modified and preparation method thereof |
| CN105525441A (en) * | 2016-01-28 | 2016-04-27 | 华南理工大学 | Foldable multilayer cross-linked composite fiber net film as well as preparation method and application thereof |
| CN106065515A (en) * | 2016-08-04 | 2016-11-02 | 江阴金泰克生物技术有限公司 | A kind of method using electrostatic spinning technique to prepare artificial antibacterial repair membrane |
| CN106592108A (en) * | 2016-12-15 | 2017-04-26 | 清华大学 | Preparation method of flexible transparent conductive film, and obtained product |
| CN106592108B (en) * | 2016-12-15 | 2019-02-05 | 清华大学 | A kind of preparation method of flexible transparent conductive film and obtained product |
| CN111188129A (en) * | 2020-01-16 | 2020-05-22 | 中国农业科学院农业信息研究所 | Ethylene sensor and preparation method of ethylene sensitive film |
| CN113325043A (en) * | 2021-07-19 | 2021-08-31 | 东北师范大学 | Flexible inorganic semiconductor resistance type room temperature gas sensor and preparation method thereof |
| CN114504951A (en) * | 2022-01-24 | 2022-05-17 | 华南理工大学 | A recyclable electret filter membrane and its preparation method, cleaning and charge regeneration method |
| CN114504951B (en) * | 2022-01-24 | 2023-09-22 | 华南理工大学 | A recyclable electret filter membrane and its preparation method, cleaning and charge regeneration method |
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Application publication date: 20110525 |