CN103235010B - Water dispersible polyaniline/carbon nanotube composite resistive type film gas-sensitive element and preparation method thereof - Google Patents
Water dispersible polyaniline/carbon nanotube composite resistive type film gas-sensitive element and preparation method thereof Download PDFInfo
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- CN103235010B CN103235010B CN201310127805.8A CN201310127805A CN103235010B CN 103235010 B CN103235010 B CN 103235010B CN 201310127805 A CN201310127805 A CN 201310127805A CN 103235010 B CN103235010 B CN 103235010B
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Abstract
The invention discloses a water dispersible polyaniline/carbon nanotube composite resistive type film gas-sensitive element and preparation method thereof, and the product is prepared by coating a layer of water dispersible polyaniline/carbon nanotube composite sensitive film on an interdigital gold electrode. The gas sensitive film is composed of polyaniline and carbon nanotube compound. The method has the advantages of simple preparation technology and mild condition, and the product is suitable for batch production. The prepared gas-sensitive element has the advantages of wide measurement scope of ammonia gas, high response sensitivity, good restorability, good linearity, room temperature detection, etc., and can be widely applied to room temperature accurate measurement of ammonia gas concentration in the industrial and agricultural production process and atmosphere environment.
Description
Technical field
The present invention relates to a kind of water dispersible polyaniline/carbon nano-tube composite resistance film gas sensor and preparation method thereof.
Background technology
In recent years, due to more and more higher, therefore also more and more important to the research and development of gas sensor to the requirement in the precision of gas sensor, performance, stability in fields such as commercial production, household safe, environmental monitoring and medical treatment.Along with the application of advanced science and technology, the trend of gas sensor development is microminiaturized, intelligent and multifunction.Because organic polymer sensitive material has that material is abundant, cost is low, filming technology is simple, is easy to other technical compatibility, works at normal temperatures, can to advantages such as microminiaturization, miniaturization, become the focus of research, cause extensive concern and the attention of various countries scientist.Polyaniline is as the typical conducting polymer composite of one, low price, there is high electric conductivity and reversible redox, doping and separate doping characteristic, be that gas sensor response sensitivity prepared by sensitive material is high with polyaniline, selectivity ratios is better, have a good application prospect at gas sensor domain, development rapidly.But polyaniline gas sensor also has its shortcoming, as turnaround time is long, reversibility is not good enough, and Polyaniline Processability can be poor, and these all limit its further research and practical application.For this reason, the polyaniline composite material that preparation can be processed is that the gas sensor of sensitive material attracts attention.Polyaniline and carbon nano-tube are carried out compound and prepares water dispersible Polymerization of Polyaniline/carbon Nanotube compound substance, the gas sensor prepared using it as sensitive material can in conjunction with polyaniline and carbon nano-tube (large specific surface area, high conductivity) advantage, add fast-response and reply, improve response sensitivity simultaneously.
Summary of the invention
The object of this invention is to provide a kind of water dispersible polyaniline/carbon nano-tube composite resistance film gas sensor and preparation method thereof.
Water dispersible polyaniline of the present invention/carbon nano-tube composite resistance film gas sensor is connected with lead-in wire on interdigital gold electrode, is coated with air-sensitive film in interdigital gold electrode surfaces, and air-sensitive film is the compound of polyaniline and carbon nano-tube.
The method for making of water dispersible polyaniline/carbon nano-tube composite resistance film gas sensor, comprises the following steps:
The interdigital gold electrode of 1 cleaning, dry for standby.
The aqueous solution of 2 configuration polystyrolsulfon acids, wherein the molecular weight of polystyrolsulfon acid is 8000-100000, and concentration is 0.5 ~ 10mg/mL.By carbon nano-tube ultrasonic disperse 10 ~ 60min in above-mentioned aqueous solution, again the aniline monomer through decompression distillation is added in the mixed water dispersion liquid of above-mentioned polystyrolsulfon acid and carbon nano-tube, consumption is add carbon nano-tube 20 ~ 500mg in every aqueous solution, aniline 4 ~ 25mL, stir 0.5 ~ 2h, obtain A aqueous solution.Then add the ammonium persulfate aqueous solution that concentration is 1 ~ 5mol/L, the volume ratio of A aqueous solution and ammonium persulfate aqueous solution is 150: 1 ~ 50: 1, is uniformly mixed reaction 5 ~ 12h, obtains the aqueous solution of water dispersible polyaniline/carbon nano tube compound material at 0 ~ 5 DEG C.
3 by step 2) aqueous solution of Polymerization of Polyaniline/carbon Nanotube compound substance is spun on interdigital electrode surface, and form sensitive membrane after drying, make gas sensor, the thickness of sensitive membrane is 2 ~ 50nm.
The interdigital width of above-mentioned interdigital gold electrode is 20 ~ 200 μm, and interdigital gap is 20 ~ 200 μm.
The present invention has the following advantages:
1) environmental protection approach is adopted, obtain the Polymerization of Polyaniline/carbon Nanotube compound substance that water dispersible is good, solve the unmanageable shortcoming of polyaniline, the methods such as spin coating can be utilized easily to cover one deck Polymerization of Polyaniline/carbon Nanotube laminated film in interdigital gold electrode surfaces, prepare resistance type thin film gas sensor.
2) water dispersible polyaniline/carbon nano tube compound material prepared by is that the carbon nano tube surface in-situ polymerization aniline by modifying at polystyrolsulfon acid obtains, instead of simple physical blending.Polystyrolsulfon acid can not only improve the aqueous dispersion performance of Polymerization of Polyaniline/carbon Nanotube compound substance, the adulterant of polyaniline can also be served as, the polymerization of induction aniline occurs in carbon nano tube surface, the Polymerization of Polyaniline/carbon Nanotube aqueous nancomposite that can obtain stable uniform falls apart liquid, thus significantly improve the composite performance of polyaniline and carbon nano-tube, improve the consistance of gas sensor, stability and yield rate.
3) the gas sensitization film that the water dispersible polyaniline prepared/carbon nano tube compound material is formed, have bigger serface, Thickness Ratio is thinner, is conducive to the scattering and permeating detecting gas, has higher sensitivity and response fast to ammonia.
4) adopt spin-coating method to prepare gas sensor, simple and easy to do, be convenient to control thickness, element consistance is good, and yield rate is high, is suitable for batch production.
It is little that gas sensor of the present invention has volume, the advantages such as cost is low, easy to use, can be widely used in the detection for ammonia in commercial production, environmental monitoring.
Embodiment
Embodiment 1:
The interdigital gold electrode of 1 cleaning, dry for standby.
The aqueous solution of 2 configuration polystyrolsulfon acids, wherein the molecular weight of polystyrolsulfon acid is 80000, and concentration is 2mg/mL.By carbon nano-tube ultrasonic disperse 30min in above-mentioned aqueous solution, add in the mixed water dispersion liquid of above-mentioned polystyrolsulfon acid and carbon nano-tube by the aniline monomer through decompression distillation again, consumption is add carbon nano-tube 100mg in every aqueous solution, aniline 15mL, stir 1h, obtain A aqueous solution.Then add the ammonium persulfate aqueous solution that concentration is 2.5mol/L, the volume ratio of A aqueous solution and ammonium persulfate aqueous solution is 100: 1, is uniformly mixed reaction 8h, obtains the aqueous solution of water dispersible polyaniline/carbon nano tube compound material at 0 ~ 5 DEG C.
3 by step 2) aqueous solution of Polymerization of Polyaniline/carbon Nanotube compound substance is spun on interdigital electrode surface, and form sensitive membrane after drying, make gas sensor, the thickness of sensitive membrane is 2 ~ 50nm.
Claims (1)
1. water dispersible polyaniline/carbon nano-tube composite resistance film gas sensor, is characterized in that: on interdigital gold electrode, be connected with lead-in wire, is coated with air-sensitive film in interdigital gold electrode surfaces, and air-sensitive film is the compound of polyaniline and carbon nano-tube; The interdigital width of described interdigital gold electrode is 20 ~ 200 μm, and interdigital gap is 20 ~ 200 μm; The method for making of described Polymerization of Polyaniline/carbon Nanotube composite resistance film gas sensor, is characterized in that:
1) interdigital gold electrode is cleaned, dry for standby;
2) configure the aqueous solution of polystyrolsulfon acid, wherein the molecular weight of polystyrolsulfon acid is 8000-100000, and concentration is 0.5 ~ 10mg/mL; By carbon nano-tube ultrasonic disperse 10 ~ 60min in above-mentioned aqueous solution, again the aniline monomer through decompression distillation is added in the mixed water dispersion liquid of above-mentioned polystyrolsulfon acid and carbon nano-tube, consumption is add carbon nano-tube 20 ~ 500mg in every aqueous solution, aniline 4 ~ 25mL, stir 0.5 ~ 2h, obtain A aqueous solution; Then add the ammonium persulfate aqueous solution that concentration is l ~ 5mol/L, the volume ratio of A aqueous solution and ammonium persulfate aqueous solution is 150: 1 ~ 50: 1, is uniformly mixed reaction 5 ~ 12h, obtains the aqueous solution of water dispersible polyaniline/carbon nano tube compound material at 0 ~ 5 DEG C;
3) by step 2) aqueous solution of Polymerization of Polyaniline/carbon Nanotube compound substance is spun on interdigital electrode surface, and form sensitive membrane after drying, make gas sensor, the thickness of sensitive membrane is 2 ~ 50nm.
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| CN201310127805.8A CN103235010B (en) | 2013-04-15 | 2013-04-15 | Water dispersible polyaniline/carbon nanotube composite resistive type film gas-sensitive element and preparation method thereof |
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| CN103235010B true CN103235010B (en) | 2015-05-13 |
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| CN107674202B (en) * | 2017-10-14 | 2020-04-28 | 郑州炜盛电子科技有限公司 | Protonic acid doped polyaniline material, room-temperature ammonia gas sensor and preparation method thereof |
| CN109030576A (en) * | 2018-06-28 | 2018-12-18 | 成都新柯力化工科技有限公司 | A kind of nitrogen dioxide gas electronic sensor material and preparation method |
| CN110128890B (en) * | 2019-06-04 | 2021-04-02 | 江南大学 | Hybrid acrylic acid electrophoretic coating and preparation method thereof |
| CN112763548A (en) * | 2020-12-16 | 2021-05-07 | 北京无线电计量测试研究所 | Carbon monoxide detection method and system based on polymer composite film |
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| CN100520385C (en) * | 2007-04-27 | 2009-07-29 | 电子科技大学 | Method for making polyaniline nanometer oxidate compound film micro-gas sensors array |
| CN101799441A (en) * | 2010-03-09 | 2010-08-11 | 浙江大学 | Polymer resistor type humidity element of water dispersion nano-polyaniline and manufacturing method thereof |
| KR101155164B1 (en) * | 2010-04-19 | 2012-06-12 | 충남대학교산학협력단 | Gas sensor having chitosan filter-conducting polyaniline nanofiber composite and its fabrication method |
| CN101936937A (en) * | 2010-07-06 | 2011-01-05 | 电子科技大学 | Micro-cantilever gas sensor and manufacturing method thereof |
| KR20120016444A (en) * | 2010-08-16 | 2012-02-24 | 연세대학교 산학협력단 | Conducting polymer and carbon nanotubes composite based gas sensor fabrication method thereof |
| CN102636522A (en) * | 2012-03-29 | 2012-08-15 | 浙江大学 | Graphene/ stannic oxide nanometer compounding resistance type film gas sensor and manufacturing method thereof |
| CN102854226B (en) * | 2012-09-14 | 2014-08-13 | 济南大学 | Metal oxide/polyaniline composite resistor-type gas-sensitive element and preparation method thereof |
| CN102866181B (en) * | 2012-09-30 | 2015-07-15 | 浙江大学 | Polyaniline/ titanium dioxide nanometer composite impedance type thin film gas sensor and preparation method thereof |
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