CN103149245A - Polyelectrolyte-carbon nanotube composite film humidity sensor - Google Patents
Polyelectrolyte-carbon nanotube composite film humidity sensor Download PDFInfo
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- CN103149245A CN103149245A CN201210390046XA CN201210390046A CN103149245A CN 103149245 A CN103149245 A CN 103149245A CN 201210390046X A CN201210390046X A CN 201210390046XA CN 201210390046 A CN201210390046 A CN 201210390046A CN 103149245 A CN103149245 A CN 103149245A
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Abstract
The invention relates to a humidity sensor based on nano material film. The humidity sensor comprises a flexible polymer substrate, a comb-like interdigital electrode, a polyelectrolyte-carbon nanotube composite film, a humidity sensitive film resistor pickup circuit board, a circuit signal line and an air hole casing. An electrostatic self-assembly method is employed to construct the polyelectrolyte-carbon nanotube composite film as a humidity sensing element on the surfaces of the flexible polymer substrate and the comb-like interdigital electrode; the film resistor pickup circuit and the humidity sensitive element are electrically connected together through a contact pin mode; the humidity sensitive element and the signal pickup circuit board are fixed through screws and nuts, and arranged in air hole plastic casing; and the circuit signal line is lead out through a casing lead hole to realize functions of data acquisition, storage, display and alarm. The sensor employs humidity sensitive and electrical characteristics of the polyelectrolyte-carbon nanotube film, and has the advantages of simple and compact structure, low cost, high linearity, good repeatability, and high speed of humidity sensitive response and recovery, etc.
Description
Technical field
What the present invention relates to is a kind of nano material film sensor and preparation method thereof, specifically relates to a kind of humidity sensor based on polyelectrolyte-carbon nano-tube coextruded film.
Background technology
Moisture sensor has important influence power and application background widely in sensor field, not only directly affects the basic living condition of the mankind, and on the very big impact that has of the aspects such as industrial or agricultural, biological products, medical and health, national defense construction.The development of humidity-sensitive element occupies an important position in the sensor industry, is the device that detects external environment humidity based on the humidity sensor of humidity-sensitive element, and it is converted into the moisture signal that detects is convenient to the signal processing, transmit, show, record.At present humidity sensor mainly comprises the kinds such as Electrolyte type, semiconductor ceramics type and high molecular polymer type, and electrolytes humidity sensor principle is simply with low cost, but can not prolonged application in high humidity environment; The stable performance of semiconductor ceramics class wet sensitive device, sensing range is wide, but temperature coefficient is higher, and the difficult desorption of anti-pollution not.It is comparatively extensive that the polymer electrolyte wet sensitive device is used, but exist the shortcomings such as poor and response time of long-time stability is long.Therefore, seek the important directions that novel sensitive material has become the humidity sensor development.
Along with the development of science and technology, nanometer technology has become very popular field, and its range of application is also in continuous expansion.Carbon nano-tube from 1991 by Japanese NEC physics professor Iijima after finding first under high resolution transmission electron microscope, the performances such as the structure that it is unique and good mechanics, electricity and chemistry have attracted the numerous scientists' in field such as material, physics, electronics, chemistry very big concern very soon.Carbon nano-tube is as the hollow tubular monodimension nanometer material, has abundant gap structure, high adsorption ability, good performances such as electric conductivity, becomes research forward position and the focus of international field of new.The research and development Novel wet dependent sensor that is found to be of carbon nano-tube provides a kind of new way.Particularly carbon nano-tube has very large specific surface area, and very strong interaction is arranged between surrounding medium, and the humidity sensitive of environment, be the ideal material of making the moisture sensor sensitive membrane to external world.Polyelectrolyte is as a kind of macromolecular material, has higher resistance under humidity environment, can realize the in-situ polymerization laminated film with effective combination of carbon nano-tube, improve the thermally-stabilised and chemical stability of film, regulate and control to a certain extent its electrology characteristic and wet sensitive sensing capabilities, be expected to prepare the resistance type sensor for wide region humidity.Therefore, the present invention utilizes wet sensitive and the electrology characteristic of polyelectrolyte/carbon nano-tube film, has prepared the resistance type humidity sensor based on polyelectrolyte-carbon nano-tube coextruded film.
Summary of the invention
The invention provides a kind of in wider humidity range, response and regeneration rate are very fast, measurable polyelectrolyte-carbon nano-tube film humidity sensor under room temperature, be provided with flexible polymer substrate, pectination interdigital electrode, polyelectrolyte-carbon nano-tube coextruded film, resistance pick-up circuit plate, electrode contact pin, ventilative shell, fairlead.
The present invention is achieved by the following technical solutions, adopt electrostatic induction nanoassemble method at polymer flexibility substrate and pectination interdigital electrode surface preparation polyelectrolyte-carbon nano-tube coextruded film as the wet sensitive sensing element, be matched with one with sheet resistance pick-up circuit plate and consist of humidity sensor, change by detecting the thin-film electro resistance detection that realizes relative humidity.
Described polyelectrolyte/carbon nano-tube coextruded film preparation method is as follows: adopt dilute sulfuric acid and diluted sodium hydroxide solution soaking and washing to be prepared with the flexible polymer substrate of pectination interdigital electrode, immerse diallyl dimethyl ammoniumchloride (PDDA) solution of 15mg/L, carry out the self assembly of PDDA, take out after 10-15 minute and use deionized water rinsing 2-3 minute, dry up; Poly-4-styrene sulfonic acid (PSS) solution that immerses again 3mg/L carries out the self assembly of PSS, takes out after 10-15 minute and uses deionized water rinsing 2-3 minute, dries up, and operation repeats once.Then immerse diallyl dimethyl ammoniumchloride (PDDA) solution of 15mg/L, carry out the self assembly of PDDA, take out after 10-15 minute and use deionized water rinsing 2-3 minute, dry up rear immersion carbon nano-tube (CNT) solution and carry out the self assembly of CNT, take out after 15-20 minute and use deionized water rinsing 2-3 minute, dry up, operation repeats five times, so far can obtain the polyelectrolyte-carbon nano-tube film of 5 layers of self assemblies.Processed 2-5 hour under 70 ℃ of vacuum drying chambers at last.
Described diallyl dimethyl ammoniumchloride is said polycation solution, and poly-4-styrene sulfonic acid is polyanion solution.
Described carbon nano-tube solution is the carboxylic carbon nano-tube dispersion liquid, concentration 2.0wt%, and particle is with negative charge.
Described comb electrodes is Cu/Ni or Cr/Au, spacing 5-200 μ m, facewidth 5-200 μ m.
Described polyelectrolyte-carbon nano-tube film thickness can carry out the nanoscale regulation and control by the self assembly number of plies.
Described flexible polymer substrate adopts the flexible polymer take polyimide as base material, and on it, photoetching and Evaporation preparation have pectination interdigital electrode pattern.
Described moisture sensor spare electrode and resistance pick-up circuit plate adopt pin type mode electricity to be connected in one.
Described moisture sensor spare is fixed assembling with resistance pick-up circuit plate by screw rod and nut, and is packaged in the bleeder vent plastic casing.
Described resistance pick-up circuit signal wire is drawn by the plastic casing fairlead, can be connected with computing machine or microprocessor, realizes the measuring abilities such as data acquisition, storage, demonstration and warning.
The present invention utilizes the electrostatic self-assembled method to prepare polyelectrolyte-carbon nano-tube film humidity sensor, provides a kind of simple and convenient, and film thickness is controlled, and the resistance type humidity sensor that absorption affinity is strong is with low cost, fast response time, repeatability and good stability.
Description of drawings
Fig. 1 is that the structure of the embodiment of the present invention forms schematic diagram, and wherein 1 is bleeder vent, and 2 is shell on plastics, 3 is standing screw, and 4 is polyelectrolyte-carbon nano-tube coextruded film, and 5 is flexible polymer substrate, 6 is the pectination interdigital electrode, 7 is the electrode contact pin, and 8 is fixing threaded hole, and 9 is resistance pick-up circuit plate, 10 is signal wire, 11 is fairlead, and 12 is the plastics lower casing, and 13 is hold-down nut.
Fig. 2 is nano thin-film wet sensitive sensing element schematic diagram, and wherein 1 is polyelectrolyte-carbon nano-tube coextruded film, and 2 is the pectination interdigital electrode, and 3 is flexible polymer substrate, and 4 is the electrode contact pin.
Fig. 3 is sensing element resistance pick-up circuit plate schematic diagram, and wherein 1 is circuit board, and 2 is fixing threaded hole, and 3,4,5 are respectively ground wire, output signal line and power lead, and 6 is electronic devices and components.
Fig. 4 is moisture sensor spare and resistance pick-up circuit plate assembling schematic diagram, and wherein 1 is moisture sensor spare, and 2 is resistance pick-up circuit plate, and 3 is standing screw, and 4 is hold-down nut, and 5 is the electrode contact pin.
Fig. 5 is the change curve (5 layers of self assemblies) of polyelectrolyte-carbon nano-tube film sensor resistance under different humidity.
Resistance and curve time response (5 layers of self assemblies) that Fig. 6 is polyelectrolyte-carbon nano-tube film sensor under dry environment (approximately 0%) switches with 75% humidity.
Embodiment
The invention will be further described in connection with accompanying drawing for following examples.
Referring to Fig. 1, the embodiment of the present invention is provided with flexible polymer substrate 5, pectination interdigital electrode 6, self assembly polyelectrolyte-carbon nano-tube coextruded film 4, resistance pick-up circuit plate 9, electrode contact pin 7, ventilative shell 2 and 12, fairlead 11, fixing threaded hole 8, standing screw 3 and nut 13.
The flexible polymer substrate of making take polyimide as base material, on it, photoetching and Evaporation preparation have pectination interdigital electrode pattern.Adopt the electrostatic self-assembled method at flexible polymer substrate and pectination interdigital electrode surface preparation polyelectrolyte/carbon nano-tube coextruded film as the wet sensitive sensing element, as shown in Figure 2, union sheet resistance pick-up circuit plate (shown in Figure 3) consists of humidity sensor in one.
Described wet sensitive sensing element electrode and sheet resistance pick-up circuit adopt pin type mode electricity to be connected in one, and wet sensitive sensing element and signal pickup circuit plate as shown in Figure 4, and are packaged in the bleeder vent plastic casing by screw rod and the fixing assembling of nut.
Described polyelectrolyte/carbon nano-tube coextruded film preparation method is as follows: adopt dilution heat of sulfuric acid and dilute sodium hydroxide soaking and washing to be prepared with the flexible polymer substrate of pectination interdigital electrode, immerse diallyl dimethyl ammoniumchloride (PDDA) solution of 15mg/L, carry out the self assembly of PDDA, take out after 10-15 minute and use deionized water rinsing 2-3 minute, dry up; Poly-4-styrene sulfonic acid (PSS) solution that immerses again 3mg/L carries out the self assembly of PSS, takes out after 10-15 minute and uses deionized water rinsing 2-3 minute, dries up, and operation repeats once.Then immerse diallyl dimethyl ammoniumchloride (PDDA) solution of 15mg/L, carry out the self assembly of PDDA, take out after 10-15 minute and use deionized water rinsing 2-3 minute, dry up rear immersion carbon nano-tube (CNT) solution and carry out the self assembly of CNT, take out after 15-20 minute and use deionized water rinsing 2-3 minute, dry up, operation repeats five times, so far can obtain the polyelectrolyte-carbon nano-tube film of 5 layers of self assemblies.Processed 2-5 hour under 70 ℃ of vacuum drying chambers at last.
Described resistance pick-up circuit signal wire is comprised of power lead, ground wire, output signal line, draws by the plastic casing fairlead, can be connected with computing machine or microprocessor, realizes the measuring abilities such as data acquisition, storage, demonstration and warning.
Adopting saturated salt method allotment surrounding environment relative humidity is 0%-97%, record the polyelectrolyte-variation of carbon nano-tube film humidity sensor resistance value under corresponding humidity environment and realize the detection of relative humidity, as shown in Figure 5, resistance variations and relative humidity have good linear relationship.
That the allotment surrounding environment is respectively is dry (approximately 0%) and two kinds of relative humidity of 75%, polyelectrolyte-carbon nano-tube film humidity sensor is switched under two kinds of environment, its resistance and time response curve as shown in Figure 6, show response and regeneration rate soon, the characteristics of good stability.
Claims (7)
1. polyelectrolyte-carbon nano-tube coextruded film humidity sensor, is characterized in that being provided with flexible polymer substrate, pectination interdigital electrode, polyelectrolyte-carbon nano-tube coextruded film, resistance pick-up circuit plate, electrode contact pin, ventilative shell, fairlead; Adopt the electrostatic induction self-assembling method at flexible polymer substrate and pectination interdigital electrode surface construction polyelectrolyte/carbon nano-tube coextruded film as the wet sensitive sensing element, be matched with one with sheet resistance pick-up circuit plate and consist of humidity sensor, change by detecting the thin-film electro resistance detection that realizes relative humidity.
2. polyelectrolyte according to claim 1-carbon nano-tube coextruded film humidity sensor, is characterized in that described laminated film thickness can carry out the nanoscale regulation and control by the self assembly number of plies.
3. polyelectrolyte according to claim 1-carbon nano-tube coextruded film humidity sensor, is characterized in that described flexible polymer substrate adopts the flexible polymer take polyimide as base material, and on it, photoetching and Evaporation preparation have pectination interdigital electrode pattern.
4. polyelectrolyte according to claim 1-carbon nano-tube coextruded film humidity sensor, is characterized in that described wet sensitive sensing element electrode and sheet resistance pick-up circuit adopt pin type mode electricity to be connected in one.
5. polyelectrolyte according to claim 1-carbon nano-tube coextruded film humidity sensor, is characterized in that described wet sensitive sensing element and signal pickup circuit plate by screw rod and the fixing assembling of nut, and be packaged in the bleeder vent plastic casing.
6. polyelectrolyte according to claim 1-carbon nano-tube coextruded film humidity sensor, it is characterized in that described resistance pick-up circuit signal wire draws by the plastic casing fairlead, can be connected with computing machine or microprocessor, realize the measuring abilities such as data acquisition, storage, demonstration and warning.
7. polyelectrolyte according to claim 1-carbon nano-tube coextruded film humidity sensor is characterized in that described polyelectrolyte-carbon nano-tube coextruded film preparation comprises the following steps:
(1) adopt dilute sulfuric acid and diluted sodium hydroxide solution soaking and washing to be prepared with the flexible polymer substrate of pectination interdigital electrode;
(2) configuration diallyl dimethyl ammoniumchloride solution and poly-4-styrene sulfonic acid solution concentration are respectively 15mg/L and 3mg/L, and the carboxylic carbon nano-tube solution concentration is 2wt.%;
(3) soaked above-mentioned substrate 10-15 minute in diallyl dimethyl ammoniumchloride solution, take out, washed with de-ionized water 2-3 minute, dry up;
(4) soaked above-mentioned substrate 10-15 minute in poly-4-styrene sulfonic acid solution, take out, washed with de-ionized water 2-3 minute, dry up;
(5) repeating step (3) and (4) are once;
(6) soaked above-mentioned substrate 10-15 minute in diallyl dimethyl ammoniumchloride solution, take out, washed with de-ionized water 2-3 minute, dry up;
(7) soaked above-mentioned substrate 15-20 minute in carboxylic carbon nano-tube solution, take out, washed with de-ionized water 2-3 minute, dry up;
(8) repeating step (6) and (7) five times;
(9) thin-film device of above-mentioned preparation was processed 2-5 hour 70 ℃ of vacuum drying chambers, obtained being coated with the electric resistance type humidity sensitive element of polyelectrolyte-carbon nano-tube film.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618475A (en) * | 2013-10-22 | 2014-03-05 | 中国石油大学(华东) | Energy collector based on grapheme/ electroactivity polymer thin film |
| CN105807145A (en) * | 2014-12-31 | 2016-07-27 | 清华大学 | Electrometer |
| CN105807144A (en) * | 2014-12-31 | 2016-07-27 | 清华大学 | Electrometer |
| CN105954323A (en) * | 2016-06-02 | 2016-09-21 | 中国石油大学(华东) | Intelligent ultralow-concentration monitoring device for gaseous pollutants discharged by thermal power plant |
| CN109557142A (en) * | 2018-12-27 | 2019-04-02 | 东南大学 | A kind of resistance type humidity sensor of quick response and its preparation method and application |
| CN110987089A (en) * | 2019-12-26 | 2020-04-10 | 华中科技大学 | Multifunctional flexible metamorphic sensor with single metal layer electrode, preparation method and application |
| CN112504497A (en) * | 2020-12-13 | 2021-03-16 | 中国航空工业集团公司北京航空精密机械研究所 | Graphene film sensor and preparation method and equipment thereof |
| CN113092540A (en) * | 2021-03-24 | 2021-07-09 | 吉林大学 | Novel high-sensitivity micro-humidity sensor and preparation method thereof |
| CN113897785A (en) * | 2021-09-24 | 2022-01-07 | 武汉纺织大学 | Preparation method of layer-by-layer self-assembled semiconductor fiber and transistor sensor |
| CN114152359A (en) * | 2020-09-08 | 2022-03-08 | 哈尔滨理工大学 | Flexible temperature sensor and preparation method thereof |
| CN114917771A (en) * | 2022-04-28 | 2022-08-19 | 浙江大学 | Hollow fiber membrane flexible humidity sensor and efficient preparation method thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618475A (en) * | 2013-10-22 | 2014-03-05 | 中国石油大学(华东) | Energy collector based on grapheme/ electroactivity polymer thin film |
| CN105807145A (en) * | 2014-12-31 | 2016-07-27 | 清华大学 | Electrometer |
| CN105807144A (en) * | 2014-12-31 | 2016-07-27 | 清华大学 | Electrometer |
| CN105954323A (en) * | 2016-06-02 | 2016-09-21 | 中国石油大学(华东) | Intelligent ultralow-concentration monitoring device for gaseous pollutants discharged by thermal power plant |
| CN109557142B (en) * | 2018-12-27 | 2021-07-09 | 东南大学 | Quick-response resistance type humidity sensor and preparation method and application thereof |
| CN109557142A (en) * | 2018-12-27 | 2019-04-02 | 东南大学 | A kind of resistance type humidity sensor of quick response and its preparation method and application |
| CN110987089A (en) * | 2019-12-26 | 2020-04-10 | 华中科技大学 | Multifunctional flexible metamorphic sensor with single metal layer electrode, preparation method and application |
| CN110987089B (en) * | 2019-12-26 | 2021-01-15 | 华中科技大学 | Multifunctional flexible metamorphic sensor with single metal layer electrode, preparation method and application |
| CN114152359A (en) * | 2020-09-08 | 2022-03-08 | 哈尔滨理工大学 | Flexible temperature sensor and preparation method thereof |
| CN112504497A (en) * | 2020-12-13 | 2021-03-16 | 中国航空工业集团公司北京航空精密机械研究所 | Graphene film sensor and preparation method and equipment thereof |
| CN113092540A (en) * | 2021-03-24 | 2021-07-09 | 吉林大学 | Novel high-sensitivity micro-humidity sensor and preparation method thereof |
| CN113092540B (en) * | 2021-03-24 | 2022-07-15 | 吉林大学 | Novel high-sensitivity micro-humidity sensor and preparation method thereof |
| CN113897785A (en) * | 2021-09-24 | 2022-01-07 | 武汉纺织大学 | Preparation method of layer-by-layer self-assembled semiconductor fiber and transistor sensor |
| CN114917771A (en) * | 2022-04-28 | 2022-08-19 | 浙江大学 | Hollow fiber membrane flexible humidity sensor and efficient preparation method thereof |
| CN114917771B (en) * | 2022-04-28 | 2023-09-29 | 浙江大学 | Hollow fiber membrane flexible humidity sensor and efficient preparation method thereof |
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Application publication date: 20130612 |