CN110793677A - Degradable paper capacitive flexible pressure sensor and preparation method thereof - Google Patents
Degradable paper capacitive flexible pressure sensor and preparation method thereof Download PDFInfo
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- CN110793677A CN110793677A CN201911022819.7A CN201911022819A CN110793677A CN 110793677 A CN110793677 A CN 110793677A CN 201911022819 A CN201911022819 A CN 201911022819A CN 110793677 A CN110793677 A CN 110793677A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
- G01L1/142—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F2009/165—Chemical reaction in an Ionic Liquid [IL]
Abstract
The invention discloses a degradable paper capacitance type flexible pressure sensor and a preparation method thereof. The paper pressure sensor not only has the advantages of high sensitivity, low cost, high temperature stability, excellent dynamic response and the like of the traditional capacitor, but also has the advantages of being disposable and environmentally friendly. The paper pressure sensor also shows good application prospect, such as assisting patients in daily body detection in the medical industry.
Description
Technical Field
The invention belongs to the field of flexible sensors, and relates to a degradable paper capacitive flexible pressure sensor and a preparation method thereof.
Background
With the development of human society, people pay more and more attention to the characteristics of electronic products such as user experience and subsequent recycling while pursuing the optimization of the use performance of electronic equipment. Most of materials adopted by the existing flexible pressure sensor, such as PDMS, rubber and the like, have the problems of difficult degradation and difficult recycling treatment. Meanwhile, the doping method and the novel composite material adopted for improving the sensitivity of the sensor further reduce the possibility of environmental protection and recovery. Therefore, the pressure sensor in the prior art has a non-negligible problem in the aspect of environmental recycling.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a degradable paper capacitive flexible pressure sensor and a preparation method thereof, and solves the problems that the sensor in the prior art is not environment-friendly and is not beneficial to recycling treatment.
The technical scheme of the invention is as follows:
a method for preparing a degradable paper capacitive flexible pressure sensor adopts paper coated with silver nanowires as two electrodes, and the two electrodes and a middle paper interlayer are sealed through PVA.
The preparation method of the silver nanowire solution comprises the following steps:
(a) adding PVP into ethylene glycol, wherein the mass ratio of the PVP to the ethylene glycol is 1: 50-1: 150;
(b) magnetically stirring the solution obtained in the step (a) at 80-120 ℃ for 2-10 h at 500-3000 rpm to completely dissolve the solution in ethylene glycol;
(c) adding silver nitrate to PVP/ethylene glycol solution, dissolving completely, adding FeCl3The solution was stirred for one minute;
(d) transferring the mixed solution obtained in the step (c) to a hydro-thermal synthesis reaction kettle, and placing the hydro-thermal synthesis reaction kettle in a hot blast circulating drying oven to react for 2-10 hours at the temperature of 110-180 ℃;
(e) after the suspension in the step (d) is cooled, centrifuging by using a centrifugal machine, and finally purifying by using absolute ethyl alcohol;
(f) dispersing the purified silver nanowires in absolute ethyl alcohol.
The preparation method of the PVA solution comprises the following steps:
(a) weighing PVA solid;
(b) adding deionized water into the PVA solid, wherein the ratio of the PVA to the deionized water is 1: 30-1: 3;
(c) and (c) magnetically stirring the solution obtained in the step (b) at the temperature of 60-100 ℃ at the rotating speed of 300-3000 rpm for 1-8 hours until the PVA is completely dissolved in the water.
The preparation method of the paper capacitive sensor comprises the following steps:
(a) pasting the paper on a glass slide, and uniformly dripping silver nanowire solution;
(b) placing the glass slide on a spin coater, setting the rotation speed of the spin coater to be 500-5000 rpm, and taking down the glass slide after 5-60 seconds to uniformly disperse the silver nanowires on the paper;
(c) repeating the previous step to manufacture another electrode, and respectively leading out two electrodes from one side coated with the silver nanowires by using copper foils; and (c) inwards coating the silver nanowire-coated side of the bipolar plate manufactured in the step (c), clamping paper between the bipolar plates, and dripping PVA along the edge of the paper for sealing.
The paper is copy paper.
The degradable paper capacitance type flexible pressure sensor is prepared according to the method.
The invention has the beneficial effects that:
1. the paper innovatively adopted by the invention is taken as a main material, and a new material research direction is provided for the development and application of degradable and recyclable sensor electronic equipment.
2. The preparation method of the invention can realize large-area large-scale production, has simple process and low cost, and the prepared paper pressure sensor has the characteristics of high sensitivity, good temperature stability and good dynamic response, and has good application prospect.
The paper pressure sensor not only has the advantages of high sensitivity, low cost, high temperature stability, excellent dynamic response and the like of the traditional capacitor, but also has the advantages of being disposable and environmentally friendly. The paper pressure sensor also shows good application prospect, such as assisting patients in daily body detection in the medical industry.
Drawings
FIG. 1; the capacitance (C) of the copy paper material sensor varies with time;
FIG. 2: the capacitance (C) of the PVA-coated copy paper material sensor varies with time;
FIG. 3: the capacitance (C) of the weighing paper material sensor varies with time.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are intended to be illustrative only and not to limit the scope of the invention.
Example 1
Take a capacitive pressure sensor with a copy paper coated with silver nanowires as an electrode and a double-layer paper towel sandwiched therebetween as an example:
1. preparing a silver nanowire solution used for an experiment;
(a) add 0.2g pvp to 25ml ethylene glycol;
(b) magnetically stirring the solution obtained in the step (a) at 100 ℃ for 1000rpm for 4-5 hours to completely dissolve the solution in ethylene glycol;
(c) adding 0.25g silver nitrate to the PVP/ethylene glycol solution, dissolving completely, adding 4ml FeCl3The solution was stirred for one minute;
(d) transferring the mixed solution obtained in the step (c) to a hydrothermal synthesis reaction kettle, and placing the mixed solution in a hot blast circulating drying oven to react for 5 hours at 140 ℃;
(e) after the suspension in the step (d) is cooled, centrifuging by using a centrifugal machine (4000rpm for 10min), and finally purifying by using absolute ethyl alcohol;
(f) dispersing the purified silver nanowires in absolute ethyl alcohol.
2. And preparing PVA solution required by the experiment.
(a) Weigh 5g of PVA solid;
(b) adding deionized water into the PVA solid, wherein the ratio of the PVA to the deionized water is 1: 10;
(c) magnetically stirring the solution obtained in the step (b) at 90 ℃ for 3-4 hours at the rotating speed of 300rpm until the PVA is completely dissolved in the water.
3. A copy paper material sensor is prepared.
(a) Pasting the single-layer copying paper cut into the square on a glass slide, and uniformly dripping silver nanowire solution;
(b) placing the glass slide on a spin coater, setting the rotation speed of the spin coater to be 750rpm, and taking down the glass slide after 15 seconds to uniformly disperse the silver nanowires on the paper;
(c) repeating the above steps to manufacture another electrode, and respectively leading out two electrodes on one side coated with the silver nanowires by using copper foils. (d) And (c) inwards coating the silver nanowires on the side of the bipolar plate manufactured in the step (c), clamping double-layer thin facial tissue paper cut into the same square shape between the bipolar plates, and dripping PVA along the edge of the paper for sealing.
(e) After PVA is completely dried, two copper electrodes of the sensor are connected with two detection ends of an instrument for detecting capacitance and are flatly laid and fixed on the back of a hand, and a series of capacitance change data are obtained through repeated fist making actions of human hands.
The detection results in FIG. 1.
Fig. 1 shows that in example 1, minute pressures are applied to both sides of a sensor at equal time intervals, and the capacitance value of the sensor at the corresponding time is recorded every 0.02s time interval by a precision instrument, and the change in capacitance of the sensor is measured while the minute pressures are repeated.
Example 2
Take a capacitive pressure sensor with a double-layer paper towel sandwiched between copy paper (spin-coated PVA) coated with silver nanowires as an electrode as an example:
1. preparing a silver nanowire solution used for an experiment;
(a) add 0.2g pvp to 25ml ethylene glycol;
(b) magnetically stirring the solution obtained in the step (a) at 100 ℃ for 1000rpm for 4-5 hours to completely dissolve the solution in ethylene glycol;
(c) adding 0.25g silver nitrate to the PVP/ethylene glycol solution, dissolving completely, adding 4ml FeCl3The solution was stirred for one minute;
(d) transferring the mixed solution obtained in the step (c) to a hydrothermal synthesis reaction kettle, and placing the mixed solution in a hot blast circulating drying oven to react for 5 hours at 140 ℃;
(e) after the suspension in the step (d) is cooled, centrifuging by using a centrifugal machine (4000rpm for 10min), and finally purifying by using absolute ethyl alcohol;
(f) dispersing the purified silver nanowires in absolute ethyl alcohol.
2. And preparing PVA solution required by the experiment.
(a) Weigh 5g of PVA solid;
(b) adding deionized water into the PVA solid, wherein the ratio of the PVA to the deionized water is 1: 10;
(c) magnetically stirring the solution obtained in the step (b) at 90 ℃ for 3-4 hours at the rotating speed of 300rpm until the PVA is completely dissolved in the water.
3. A PVA coated copy paper material sensor was prepared.
(a) Pasting the single-layer copying paper cut into the square on a glass slide, and uniformly dripping silver nanowire solution;
(b) placing the glass slide on a spin coater, setting the rotation speed of the spin coater to be 750rpm, and taking down the glass slide after 15 seconds to uniformly disperse the silver nanowires on the paper; after the paper is dried completely, the rotating speed of the glue homogenizing machine is set to be 500rpm for 5 seconds, and PVA is uniformly coated on the surface layer of the silver nanowires in a spinning mode.
(c) Repeating the above steps to manufacture another electrode, and respectively leading out two electrodes on one side coated with the silver nanowires by using copper foils.
(d) And (c) inwards coating the silver nanowires on the side of the bipolar plate manufactured in the step (c), clamping double-layer thin facial tissue paper cut into the same square shape between the bipolar plates, and dripping PVA along the edge of the paper for sealing.
(e) After PVA is completely dried, two copper electrodes of the sensor are connected with two detection ends of an instrument for detecting capacitance and are flatly laid and fixed on the back of a hand, and a series of capacitance change data are obtained through repeated fist making actions of human hands.
The detection results in FIG. 2.
Fig. 2 shows that in example 2, minute pressures are applied to both sides of the sensor at equal time intervals, and the capacitance value of the sensor at the corresponding time is recorded every 0.02s time interval by using a precision instrument, and the change in capacitance of the sensor is measured while the minute pressures are repeated.
Example 3
Taking a capacitive pressure sensor with weighing paper coated with silver nanowires as an electrode and a double-layer paper towel sandwiched therebetween as an example:
1. preparing a silver nanowire solution used for an experiment;
(a) add 0.2g pvp to 25ml ethylene glycol;
(b) magnetically stirring the solution obtained in the step (a) at 100 ℃ for 1000rpm for 4-5 hours to completely dissolve the solution in ethylene glycol;
(c) adding 0.25g silver nitrate to the PVP/ethylene glycol solution, dissolving completely, adding 4ml FeCl3The solution was stirred for one minute;
(d) transferring the mixed solution obtained in the step (c) to a hydrothermal synthesis reaction kettle, and placing the mixed solution in a hot blast circulating drying oven to react for 5 hours at 140 ℃;
(e) after the suspension in the step (d) is cooled, centrifuging by using a centrifugal machine (4000rpm for 10min), and finally purifying by using absolute ethyl alcohol;
(f) dispersing the purified silver nanowires in absolute ethyl alcohol.
2. And preparing PVA solution required by the experiment.
(a) Weigh 5g of PVA solid;
(b) adding deionized water into the PVA solid, wherein the ratio of the PVA to the deionized water is 1: 10;
(c) magnetically stirring the solution obtained in the step (b) at 90 ℃ for 3-4 hours at the rotating speed of 300rpm until the PVA is completely dissolved in the water.
3. A weighed paper material sensor was prepared.
(a) Pasting the square-cut single-layer experimental weighing paper on a glass slide, and uniformly dripping silver nanowire solution;
(b) placing the glass slide on a spin coater, setting the rotation speed of the spin coater to be 750rpm, and taking down the glass slide after 15 seconds to uniformly disperse the silver nanowires on the paper;
(c) repeating the above steps to manufacture another electrode, and respectively leading out two electrodes on one side coated with the silver nanowires by using copper foils.
(d) The side of the bipolar plate manufactured in the step (c) coated with the silver nanowires faces inwards, double-layer thin facial tissue paper cut into the same square shape is clamped between the bipolar plates, and PVA is dripped along the edge of the paper for sealing
(e) After PVA is completely dried, two copper electrodes of the sensor are connected with two detection ends of an instrument for detecting capacitance and are flatly laid and fixed on the back of a hand, and a series of capacitance change data are obtained through repeated fist making actions of human hands.
The detection results in FIG. 3.
Fig. 3 shows that in example 3, minute pressures are applied to both sides of the sensor at equal time intervals, and the capacitance value of the sensor at the corresponding time is recorded every 0.02s time interval by using a precision instrument, and the change in capacitance of the sensor is measured while the minute pressures are repeated.
The experimental results show that:
the same manufacturing process and different materials (copy paper, copy paper coated with PVA, weighing paper) are adopted in the three embodiments, and the data graph curves show that: comparing the data of fig. 1, 2 and 3 shows that the sensitivity of the sensor for the copy paper material is highest, the PVA coated copy paper is centered and the weighing paper is worst when the same pressure is applied. This also testifies the requirement of the paper capacitance sensor to be made of soft and light material. Therefore, under the same process, the copying paper is used as the electrode substrate material as the optimal choice.
Claims (6)
1. A method for preparing a degradable paper capacitive flexible pressure sensor is characterized in that paper coated with silver nanowires is used as two electrodes, and the two electrodes and a middle paper interlayer are sealed through PVA.
2. The method for preparing the degradable paper capacitive flexible pressure sensor according to claim 1, wherein the method for preparing the silver nanowire solution comprises the following steps:
(a) adding PVP into ethylene glycol, wherein the mass ratio of the PVP to the ethylene glycol is 1: 50-1: 150;
(b) magnetically stirring the solution obtained in the step (a) at 80-120 ℃ for 2-10 h at 500-3000 rpm to completely dissolve the solution in ethylene glycol;
(c) adding silver nitrate to PVP/ethylene glycol solution, dissolving completely, adding FeCl3The solution was stirred for one minute;
(d) transferring the mixed solution obtained in the step (c) to a hydro-thermal synthesis reaction kettle, and placing the hydro-thermal synthesis reaction kettle in a hot blast circulating drying oven to react for 2-10 hours at the temperature of 110-180 ℃;
(e) after the suspension in the step (d) is cooled, centrifuging by using a centrifugal machine, and finally purifying by using absolute ethyl alcohol;
(f) dispersing the purified silver nanowires in absolute ethyl alcohol.
3. The method for preparing the degradable paper capacitive flexible pressure sensor according to claim 1, wherein the method for preparing the PVA solution comprises the following steps:
(a) weighing PVA solid;
(b) adding deionized water into the PVA solid, wherein the ratio of the PVA to the deionized water is 1: 30-1: 3;
(c) magnetically stirring the solution obtained in the step (b) at the temperature of 60-100 ℃ at the rotating speed of 300-3000 rpm for 1-8 hours,
until the PVA was completely dissolved in the water.
4. The method for preparing the degradable paper capacitive flexible pressure sensor according to claim 1, wherein the method for preparing the paper capacitive sensor comprises the following steps:
(a) pasting the paper on a glass slide, and uniformly dripping silver nanowire solution;
(b) placing the glass slide on a spin coater, setting the rotation speed of the spin coater to be 500-5000 rpm, and taking down the glass slide after 5-60 seconds to uniformly disperse the silver nanowires on the paper;
(c) repeating the previous step to manufacture another electrode, and respectively leading out two electrodes from one side coated with the silver nanowires by using copper foils; and (c) inwards coating the silver nanowire-coated side of the bipolar plate manufactured in the step (c), clamping paper between the bipolar plates, and dripping PVA along the edge of the paper for sealing.
5. The method for making the degradable paper capacitive flexible pressure sensor of claim 1, wherein the paper is a copy paper.
6. A degradable paper capacitive flexible pressure sensor prepared according to the method of any one of claims 1 to 5.
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| CN2524232Y (en) * | 2001-12-03 | 2002-12-04 | 张开逊 | Two Dimensional flexible pressure sensor |
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| WO2017122178A1 (en) * | 2016-01-14 | 2017-07-20 | King Abdullah University Of Science And Technology | Paper based electronics platform |
| CN109520645A (en) * | 2018-11-22 | 2019-03-26 | 南方科技大学 | A kind of integral type capacitance type sensor and its preparation method and application |
| CN109752029A (en) * | 2018-12-11 | 2019-05-14 | 东北大学 | A kind of preparation method of the capacitive flexible sensor of paper base |
| CN109764979A (en) * | 2018-12-18 | 2019-05-17 | 深圳先进技术研究院 | Ion paper, from electronic flexible pressure sensor and preparation method thereof |
| US20190200890A1 (en) * | 2016-07-14 | 2019-07-04 | Lifelens Technologies, Llc | Thin film support structures |
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2019
- 2019-10-25 CN CN201911022819.7A patent/CN110793677A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2524232Y (en) * | 2001-12-03 | 2002-12-04 | 张开逊 | Two Dimensional flexible pressure sensor |
| WO2017122178A1 (en) * | 2016-01-14 | 2017-07-20 | King Abdullah University Of Science And Technology | Paper based electronics platform |
| US20190200890A1 (en) * | 2016-07-14 | 2019-07-04 | Lifelens Technologies, Llc | Thin film support structures |
| CN206116459U (en) * | 2016-08-09 | 2017-04-19 | 江苏艾伦摩尔微电子科技有限公司 | Flexible capacitanc pressure sensor of sandwich formula |
| CN109520645A (en) * | 2018-11-22 | 2019-03-26 | 南方科技大学 | A kind of integral type capacitance type sensor and its preparation method and application |
| CN109752029A (en) * | 2018-12-11 | 2019-05-14 | 东北大学 | A kind of preparation method of the capacitive flexible sensor of paper base |
| CN109764979A (en) * | 2018-12-18 | 2019-05-17 | 深圳先进技术研究院 | Ion paper, from electronic flexible pressure sensor and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| WEIZHI LI.ETC: "High-Performance Paper-Based Capacitive Flexible Pressure Sensor and Its Application in Human-Related Measurement", 《NANOSCALE RESEARCH LETTERS》 * |
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Application publication date: 20200214 |