CN102495034A - Nano-gold/silicon dioxide nuclear shell material surface fluorescent enhancement sensor for explosive - Google Patents
Nano-gold/silicon dioxide nuclear shell material surface fluorescent enhancement sensor for explosive Download PDFInfo
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- CN102495034A CN102495034A CN2011103974721A CN201110397472A CN102495034A CN 102495034 A CN102495034 A CN 102495034A CN 2011103974721 A CN2011103974721 A CN 2011103974721A CN 201110397472 A CN201110397472 A CN 201110397472A CN 102495034 A CN102495034 A CN 102495034A
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Abstract
The invention discloses a nano-gold/silicon dioxide nuclear shell material surface fluorescent enhancement sensor for detecting nitro-aromatic explosives. The sensor comprises a light emitting diode end face coupled plastic optical fiber sensor head, a gas chamber, a high-pass filter sheet and a photomultiplier, wherein the light emitting diode end face coupled plastic optical fiber sensor head comprises a light emitting diode, a bandpass filter sheet and a plastic optical fiber sensor head of which the surface is coated with an MEH-PPV sensitive material containing the nano-gold/silicon dioxide nuclear shell material and a fluorescent indicator. The lower detection limit of the nano-gold/silicon dioxide nuclear shell material surface fluorescent enhancement sensor for detecting the nitro-aromatic explosives can be improved by 5 to 10 times; furthermore, the sensor has the advantages of high detection speed, stable working performance, long service life, low cost and the like.
Description
Technical field
The present invention relates to a kind of sensor, particularly a kind of nm of gold/silica core-shell material surface strengthens the fluorescence explosives sensor.
Background technology
Along with the growth of international terrorism force, the extremist has made a series of pernicious explosive incidents all over the world, and these incidents have constituted great threat to human existence safety, therefore how to detect the Tibetan
The explosive of hideing on luggage, mail, vehicle, aircraft and suspect's health has become the problem that various countries law enforcement agency faces jointly.
The detection technique of explosive can be divided into body Detection Techniques and microscratch amount detection technique.
The body of explosive is visited shortcomings such as the detection technique existence costs an arm and a leg, sensitivity is low, equipment volume is big, thereby has limitation in application facet.
The microscratch amount detection technique of explosive mainly be steam that explosive is volatilized and to thing (the comprising human body) surface that adheres to explosive vessel surface and any contacted explosive the technology that detects of residual microscratch amount explosive.
At present, can be used for to the technology that microscratch amount explosive detects mainly be various spectroscopic techniques, based on the sensing technology of fluorescent quenching principle and biosensor technique etc.The wave spectrum detection method mainly contains vapor-phase chromatography (GC), mass spectroscopy (MS) and ionic migration method (IMS) etc.At present, these microscratch amount detection techniques all also are in continuous exploration and the development.With regard to DEVELOPMENT PROSPECT; The fluorescent quenching explosives sensor has that detection speed is fast, detection sensitivity is high, good stability, the sensor cost is low, volume is little, advantage such as easy and simple to handle, is considered to one of present explosive trace detection, detection aspect best techniques.
Nm of gold strengthens the fluorescence explosives sensor based on the fluorescent quenching principle; The nm of gold material has special surface effect, quantum size effect and macro quanta tunnel effect, is demonstrating the superior function that conventional material does not possess aspect electricity, magnetics, optics and the chemical property.Therefore, wide application prospect is being arranged aspect catalysis, electronic material, micro element, reinforcing material and the sensor material.When nm of gold is used for optics and electrochemical sensing,, can play the effect that signal strengthens and amplifies, therefore can improve the sensitivity of detection detection owing to have good optical and electronics property.The surface plasma body resonant vibration of nano Au particle can greatly strengthen the electromagnetic field around the particle; This local fields can change its surperficial condition of the free space of fluorophor on every side that reaches that is adsorbed in; The fluorescence of fluorophor is enhanced, and this phenomenon is called the nm of gold surface and strengthens fluorescent effect.This effect has characteristics such as the fluorescence quantum yield of increasing, increase Forster distance, raising light stability.Become the focus of people's research as the development technique of biological detection of new generation, mark and fluorescence chemical sensor.
At present based on the main difficult technical of the microscratch amount explosives sensor of fluorescent quenching principle be fluorescence indicator fluorescence intensity a little less than, survey the difficulty of fluorescence signal thereby increased, and the sensitivity that makes system with detect lower limit and reduce.
Summary of the invention
The objective of the invention is provides a kind of nm of gold/silica core-shell material surface to strengthen the fluorescence explosives sensor in order to solve above-mentioned technical matters; Promptly adopt the nm of gold surface to strengthen fluorescent effect and improve the fluorescence intensity of fluorescence indicator, and then can improve the sensitivity and detection lower limit of system.
Know-why of the present invention
Utilization has highly sensitive nm of gold surface and strengthens the concentration that fluorescent effect is measured nitro arene explosive substance, fluorescence indicator employing 2-methoxyl-5-(2 '-ethyl hexyl oxy)-1,4-is to phenylacetylene (MEH-PPV).When the nitro arene explosive substance change in concentration; Basic photophysical property such as the fluorescence intensity of indicator MEH-PPV sensitive material, fluorescence lifetime changes; Confirm the concentration of nitro arene explosive substance through fluorescence intensity or fluorescence lifetime; In sensitive material, introduce nm of gold/silica core shell material particle, utilize nm of gold/silica core-shell material surface to strengthen the fluorescence efficiency that fluorescent effect improves fluorescence indicator, and then improve the sensitivity that detects.
Technical scheme of the present invention
A kind of detection nitro arene explosive substance sensor that utilizes nm of gold/silica core-shell material surface to strengthen fluorescence; Comprise light emitting diode end face coupling plastic optical fiber sensor head, air chamber, high-pass filter, photomultiplier, wherein said light emitting diode end face coupling plastic optical fiber sensor head comprises that light emitting diode, bandpass filter and surface scribble the plastic optical fiber sensing head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material;
Wherein the light that sends of the light emitting diode in the plastic optical fiber sensor head of light emitting diode end face coupling is coupled to the surface through end face and scribbles on the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material; In order to eliminate the influence of light that light emitting diode sends to fluorescence detection; Before light emitting diode, add a bandpass filter; The surface scribbles the plastic optical fiber sensing head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material and is placed in the air chamber; Adopt photomultiplier to receive fluorescence, before photomultiplier, placing one is that the high-pass filter of 510nm is to filter exciting light by wavelength;
The centre wavelength of described bandpass filter is 470nm, and bandwidth is 20nm.
A kind of detection nitro arene explosive substance sensor that utilizes nm of gold/silica core-shell material surface enhancing fluorescence and preparation method thereof comprises the steps:
(1), the pre-service of plastic optical fiber
Plastic optical fiber is peelled off the long sheath of about 2cm with blade with center section, will peel off the optical fiber of sheath then and wipe clean, the optical fiber of peelling off sheath is curved U-shaped with cotton ball soaked in alcohol;
(2), preparation contains the sol-gel solution of nm of gold and fluorescence indicator MEH-PPV sensitive material:
1., be that positive tetraethyl orthosilicate, MTES, the concentration of 1:3:1:0.55 is that 95% ethanol, the aqueous hydrochloric acid solution of 0.03mol/l are poured wiring solution-forming A in the flask successively into volume ratio, then with fluorescence indicator MEH-PPV add in the solution solution B;
The addition of fluorescence indicator MEH-PPV is fluorescence indicator MEH-PPV by the mass volume ratio of itself and solution A: solution A is 2-10mg:1mL;
2., with 50mL concentration be 0.01% gold chloride ethanolic solution through the 1000r/min magnetic agitation, be heated to boiling simultaneously, the concentration that is added in the 50ml that is incubated in 50 ℃ of water-baths rapidly is in 1% the sodium citrate aqueous solution, to form solution C;
3., the solution C of the solution B of step (1) gained and (2) gained mixes, and under 50 ℃ of water bath condition, stirs 6h, promptly obtains the transparent sol-gel solution that contains nm of gold/silica core shell material and indicator MEH-PPV sensitive material;
(3), the surface scribbles the preparation of the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material
Pretreated U-shaped plastic optical fiber in the step (1) is inserted in the sol-gel solution for preparing; Use czochralski method to coat the colloidal sol that contains nm of gold/silica core shell material and indicator MEH-PPV sensitive material of thickness, promptly scribble the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material in the surface at the room temperature airing as 1mm;
(4), light emitting diode and plastic optical fiber sensor head are carried out the end face coupling
The surface that step (3) is prepared scribbles plastic optical fiber sensor head process end face coupled method that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material and the light emitting diode coupling that has optical filter, and concrete grammar is: at first processing an external diameter is 20mm, and internal diameter is 5mm; Length is the metal bar of 5mm; With diameter is the hole that the light emitting diode of 5mm is put into metal bar, and processing one one end internal diameter then is 20mm, and external diameter is 25mm; Length is 10mm; Other end internal diameter is 2mm, and external diameter is 5mm, and length is the metal sleeve of 5mm; With diameter is that the bandpass filter of 20mm is placed on the end that internal diameter is 20mm; With diameter is that the surface of 2mm scribbles the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material to insert internal diameter be the other end of 2mm, and the metal sleeve that optical filter will be housed at last is set on the metal bar that light emitting diode is housed, and obtains the plastic optical fiber sensor head of light emitting diode end face coupling;
(5), the assembling of sensor
Surface in the plastic optical fiber sensor head of the light emitting diode end face of step (4) gained coupling is scribbled the plastic optical fiber sensing head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material to be placed in the air chamber; Adopt photomultiplier to receive fluorescence; Place before the photomultiplier one by wavelength be the high-pass filter of 510nm filtering exciting light, final a kind of detection nitro arene explosive substance sensor that utilize nm of gold/silica core-shell material surface to strengthen fluorescence.
A kind of detection nitro arene explosive substance sensor that utilizes nm of gold/silica core-shell material surface to strengthen fluorescence of above-mentioned gained is used for environmental quality monitoring; The nitro arene explosive substance on ground such as airport, station detects; Like the security check on airport, the ground such as inlet at station; When client carried nitro arene explosive substance, this device can detect in the several seconds.Because enhancement effect of fluorescence, the lower limit of explosive detection and sensitivity can be than present based on the fluorescent quenching principle the high 5-10 of explosive detection device times.
Beneficial effect of the present invention
Nm of gold of the present invention/silica core-shell material surface strengthens the detection nitro arene explosive substance sensor of fluorescence; Wherein the plastic optical fiber sensing head in the light emitting diode end face coupling plastic optical fiber sensor head is owing to adopted nm of gold/silica core shell material; This material can make the fluorescence intensity of indicator MEH-PPV sensitive material improve 5-10 doubly, therefore can make detection lower limit and sensitivity improve 5-10 doubly.
Simultaneously, owing to the explosive molecule can interact with fluorescence indicator in the several seconds, so sensor speed of the present invention is fast, and because the method that adopts fluorescence intensity and fluorescence lifetime to detect simultaneously, so working sensor stable performance of the present invention.
In addition, owing to adopt light emitting diode rather than the higher laser instrument of price, so sensor cost of the present invention is low.
Description of drawings
Fig. 1, a kind of detection nitro arene explosive substance sensor construction synoptic diagram that utilizes nm of gold/silica core-shell material surface to strengthen fluorescence; Wherein 1 is light emitting diode; 2 is bandpass filter, and 3 is air chamber, and 4 are the surperficial sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material that scribbles; 5 is high-pass filter, and 6 is photomultiplier.
Embodiment
Through embodiment the present invention is further set forth below, but do not limit the present invention.
Embodiment 1
A kind of detection nitro arene explosive substance sensor that utilizes nm of gold/silica core-shell material surface to strengthen fluorescence comprises plastic optical fiber sensor head, air chamber, high-pass filter, photomultiplier that the light emitting diode end face is coupled;
The plastic optical fiber sensor head of wherein said light emitting diode end face coupling comprises that light emitting diode, bandpass filter and surface scribble the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material;
Wherein the light that sends of the light emitting diode in the plastic optical fiber sensor head of light emitting diode end face coupling is coupled to the surface through end face and scribbles on the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material; In order to eliminate the influence of light that light emitting diode sends to fluorescence detection; Add a bandpass filter at the light source luminescent diode; The surface scribbles the plastic optical fiber sensing head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material and is placed in the air chamber; Adopt photomultiplier to receive fluorescence, before photomultiplier, placing one is the high-pass filter of 510nm by wavelength;
The centre wavelength of described bandpass filter is 470nm, and bandwidth is 20nm.
Its structural representation is as shown in Figure 1, and wherein 1 is light emitting diode, and 2 is bandpass filter; 3 is air chamber; 4 for the surface scribbles the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material, and 5 is high-pass filter, and 6 is photomultiplier;
Above-mentioned a kind of preparation method who utilizes nm of gold/silica core-shell material surface to strengthen the detection nitro arene explosive substance sensor of fluorescence comprises the steps:
(1), the pre-service of plastic optical fiber
Plastic optical fiber is peelled off the sheath of about 2 centimeter length with blade with center section, will peel off the optical fiber of sheath then and wipe clean, the optical fiber of peelling off sheath is curved U-shaped with cotton ball soaked in alcohol;
(2), preparation contains the sol-gel solution of nm of gold and fluorescence indicator MEH-PPV sensitive material:
1., be that positive tetraethyl orthosilicate, MTES, the concentration of 1:3:1:0.55 is that 95% alcohol, the aqueous hydrochloric acid solution of 0.03mol/l are poured wiring solution-forming A in the flask successively into volume ratio, then with fluorescence indicator MEH-PPV add in the solution solution B;
The addition of fluorescence indicator MEH-PPV is MEH-PPV by the mass volume ratio of itself and solution A: solution A is 2-10mg:1ml;
2., with 50mL concentration be 0.01% gold chloride ethanolic solution through the 1000r/min magnetic agitation, be heated to boiling simultaneously, the concentration that is added in the 50ml that is incubated in 50 ℃ of water-baths rapidly is in 1% the sodium citrate aqueous solution, to form solution C;
3., the solution C of the solution B of step (1) gained and (2) gained mixes, and under 50 ℃ of water bath condition, stirs 6h, promptly obtains the transparent sol-gel solution that contains nm of gold/silica core shell material and indicator MEH-PPV sensitive material;
(3), the surface scribbles the preparation of the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material
Pretreated U-shaped plastic optical fiber in the step (1) is inserted in the sol-gel solution that contains nm of gold/silica core shell material and indicator MEH-PPV sensitive material for preparing; Use czochralski method coat thickness as 2mm contain nm of gold/silica core shell material and indicator MEH-PPV sensitive material, promptly scribble the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material in the surface at the room temperature airing;
(4), light emitting diode and plastic optical fiber sensor head are carried out the end face coupling
The above-mentioned surface for preparing is scribbled the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material be coupled through end face coupled method and the light emitting diode that has optical filter, concrete grammar is: at first processing an external diameter is 20mm, and internal diameter is 5mm; Length is the metal bar of 5mm; With diameter is the hole that the light emitting diode of 5mm is put into metal bar, and processing one one end internal diameter then is 20mm, and external diameter is 25cm; Length is 10mm; Other end internal diameter is 2mm, and external diameter is 5mm, and length is the metal sleeve of 5mm; With diameter is that the bandpass filter of 20mm is placed on the end that internal diameter is 20mm; With diameter is that the surface of 2mm scribbles the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material to insert internal diameter be the other end of 2mm, and the metal sleeve that optical filter will be housed at last is set on the metal bar that light emitting diode is housed, and obtains the plastic optical fiber sensor head of light emitting diode end face coupling;
(5), the assembling of sensor
Plastic optical fiber sensing head in the plastic optical fiber sensor head of the light emitting diode end face of step (4) gained coupling is placed in the air chamber; Adopt photomultiplier to receive fluorescence; Place before the photomultiplier one by wavelength be the high-pass filter of 510nm filtering exciting light, final a kind of detection nitro arene explosive substance sensor that utilize nm of gold/silica core-shell material surface to strengthen fluorescence.
Foregoing is merely the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (2)
1. a detection nitro arene explosive substance sensor that utilizes nm of gold/silica core-shell material surface to strengthen fluorescence comprises plastic optical fiber sensor head, air chamber, high-pass filter, photomultiplier that the light emitting diode end face is coupled;
The plastic optical fiber sensor head of wherein said light emitting diode end face coupling comprises light emitting diode, bandpass filter; The plastic optical fiber sensor head that it is characterized in that described light emitting diode end face coupling comprises that also the surface scribbles the plastic optical fiber sensing head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material;
Wherein the light that sends of the light emitting diode in the light emitting diode end face coupling plastic optical fiber sensor head is coupled to the surface through end face and scribbles on the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material; Before the light source luminescent diode, add a bandpass filter; The surface scribbles the plastic optical fiber sensing head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material and is placed in the air chamber; Adopt photomultiplier to receive fluorescence, before photomultiplier, placing one is the high-pass filter of 510nm by wavelength;
The centre wavelength of described bandpass filter is 470nm, and bandwidth is 20nm.
2. a preparation method who utilizes nm of gold/silica core-shell material surface to strengthen the detection nitro arene explosive substance sensor of fluorescence is characterized in that comprising the steps:
(1), the pre-service of plastic optical fiber
Plastic optical fiber is peelled off the long sheath of about 2cm with blade with center section, will peel off the optical fiber of sheath then and wipe clean, the optical fiber of peelling off sheath is curved U-shaped with cotton ball soaked in alcohol;
(2), preparation contains the sol-gel solution of nm of gold and fluorescence indicator MEH-PPV sensitive material
1., be that positive tetraethyl orthosilicate, MTES, the concentration of 1:3:1:0.55 is that 95% ethanol, the aqueous hydrochloric acid solution of 0.03mol/l are poured wiring solution-forming A in the flask successively into volume ratio, then with fluorescence indicator MEH-PPV add in the solution solution B;
The addition of fluorescence indicator MEH-PPV is fluorescence indicator MEH-PPV by the mass volume ratio of itself and solution A: solution A is 2-10mg:1mL;
2., with 50mL concentration be 0.01% gold chloride ethanolic solution through the 1000r/min magnetic agitation, be heated to boiling simultaneously, the concentration that is added in the 50ml that is incubated in 50 ℃ of water-baths rapidly is in 1% the sodium citrate aqueous solution, to form solution C;
3., the solution C of the solution B of step (1) gained and (2) gained mixes, and under 50 ℃ of water bath condition, stirs 6h, promptly obtains the transparent sol-gel solution that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material;
(3), the surface scribbles the preparation of the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material
Pretreated U-shaped plastic optical fiber in the step (1) is inserted in the sol-gel solution for preparing; Use czochralski method to coat the colloidal sol that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material of thickness, promptly scribble the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material in the surface at the room temperature airing as 1mm;
(4), light emitting diode and plastic optical fiber sensor head are carried out the end face coupling
The surface that step (3) is prepared scribbles plastic optical fiber sensing head process end face coupled method that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material and the light emitting diode coupling that has optical filter, and concrete grammar is: at first processing an external diameter is 20mm, and internal diameter is 5mm; Length is the metal bar of 5mm; With diameter is the hole that the light emitting diode of 5mm is put into metal bar, and processing one one end internal diameter then is 20mm, and external diameter is 25mm; Length is 10mm; Other end internal diameter is 2mm, and external diameter is 5mm, and length is the metal sleeve of 5mm; With diameter is that the bandpass filter of 20mm is placed on the end that internal diameter is 20mm; With diameter is that the surface of 2mm scribbles the plastic optical fiber sensor head that contains nm of gold/silica core shell material and fluorescence indicator MEH-PPV sensitive material to insert internal diameter be the other end of 2mm, and the metal sleeve that optical filter will be housed at last is set on the metal bar that light emitting diode is housed, and obtains the plastic optical fiber sensor head of light emitting diode end face coupling;
(5), the assembling of sensor
Plastic optical fiber sensing head in the plastic optical fiber sensor head of the light emitting diode end face of step (4) gained coupling is placed in the air chamber; Adopt photomultiplier to receive fluorescence; Place before the photomultiplier one by wavelength be the high-pass filter of 510nm filtering exciting light, final a kind of detection nitro arene explosive substance sensor that utilize nm of gold/silica core-shell material surface to strengthen fluorescence.
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| CN103674909A (en) * | 2013-09-27 | 2014-03-26 | 上海电力学院 | Sensor for detecting gas nitro-aromatics explosives |
| CN104251847A (en) * | 2013-06-28 | 2014-12-31 | 天津奇谱光电技术有限公司 | Fluorescence method optical fiber sensing system |
| CN105866091A (en) * | 2016-06-03 | 2016-08-17 | 湖南华南光电科技股份有限公司 | Portable trace explosive detector |
| CN106525789A (en) * | 2016-10-24 | 2017-03-22 | 武汉鹰飞拓光电子有限公司 | Preparation method for detecting explosive sensitive thin-film |
| CN107063434A (en) * | 2017-05-24 | 2017-08-18 | 苏州至禅光纤传感技术有限公司 | A kind of distributed vibration sensing method based on special optical fiber |
| CN111812163A (en) * | 2020-06-23 | 2020-10-23 | 武汉工程大学 | Semiconductor resistor type ethanol gas sensor and preparation method thereof |
| CN105866091B (en) * | 2016-06-03 | 2024-06-07 | 湖南华南光电科技股份有限公司 | Portable trace explosive detector |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104251847A (en) * | 2013-06-28 | 2014-12-31 | 天津奇谱光电技术有限公司 | Fluorescence method optical fiber sensing system |
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| CN105866091A (en) * | 2016-06-03 | 2016-08-17 | 湖南华南光电科技股份有限公司 | Portable trace explosive detector |
| CN105866091B (en) * | 2016-06-03 | 2024-06-07 | 湖南华南光电科技股份有限公司 | Portable trace explosive detector |
| CN106525789A (en) * | 2016-10-24 | 2017-03-22 | 武汉鹰飞拓光电子有限公司 | Preparation method for detecting explosive sensitive thin-film |
| CN107063434A (en) * | 2017-05-24 | 2017-08-18 | 苏州至禅光纤传感技术有限公司 | A kind of distributed vibration sensing method based on special optical fiber |
| CN111812163A (en) * | 2020-06-23 | 2020-10-23 | 武汉工程大学 | Semiconductor resistor type ethanol gas sensor and preparation method thereof |
| CN111812163B (en) * | 2020-06-23 | 2022-11-29 | 武汉工程大学 | Semiconductor resistor type ethanol gas sensor and preparation method thereof |
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