CN114539574B - Preparation method and application of piezoelectric-triboelectric coupling induction material - Google Patents
Preparation method and application of piezoelectric-triboelectric coupling induction material Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- H—ELECTRICITY
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- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
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Abstract
The invention discloses a preparation method and application of a piezoelectric-friction electric coupling induction material, wherein the preparation method comprises the following steps: s1: dissolving hydroxypropyl cellulose, chitosan and carbon nano tube in an acid solution to prepare a hydroxypropyl cellulose/chitosan/carbon nano tube solution; s2: and (3) casting the hydroxypropyl cellulose/chitosan/carbon nanotube solution on a polytetrafluoroethylene substrate for drying to obtain the piezoelectric-triboelectric coupling induction material. The sensing material of the invention adopts HPC, CTS and CNT to prepare the film which is used for the positive electrode of the piezoelectric-triboelectric coupling sensing material and has piezoelectric property by a tape casting method, and has excellent mechanical property and signal conversion property.
Description
Technical Field
The invention relates to a piezoelectric-friction electric coupling induction material, in particular to a preparation method and application of the piezoelectric-friction electric coupling induction material.
Background
At present, the growing problem of energy shortage and the huge power consumption caused by the high dependence of people on intelligent electronic products are contradictory, and the research of various sustainable alternative clean energy sources, such as wind energy, geothermal energy, biological energy, mechanical energy, nuclear energy and the like, is promoted, and the characteristics of environmental protection, recycling and the like are widely focused. The mechanical energy has the advantages of extremely wide distribution in the environment, rich and various forms, little influence by the external environment, dense energy, convenient collection and the like, and has great potential. In recent years, the mechanical energy collection research is mainly focused on piezoelectric mechanisms such as piezoelectric, triboelectric and piezoelectric-triboelectric coupling, and the like, and particularly the flexible sensing energy storage device of the piezoelectric-triboelectric coupling has wide research and application in various fields due to the unique advantages of small mass, high flexibility, high performance, high sensitivity and the like. With the development of modern technology and national defense technology, the volume requirements of electronic devices are smaller and smaller, the performance requirements are higher and the concealment is higher and higher. To meet such a demand, currently, in real life, tiny electronic products and devices are mainly powered by chemical batteries, because the chemical batteries have the advantage of stable output energy. However, in some special environments, chemical batteries have some drawbacks that are difficult to avoid. For example, for small electronic devices, most are used for a long period of time, but are discarded because of the high recovery cost. Therefore, the use of chemical batteries causes great environmental pollution, and the chemical batteries cannot meet the demands of micro electronic devices due to the volume limitation. The presence of these defects makes the chemical batteries inadequate for the power requirements of the tiny detection electronics.
The piezoelectric-triboelectric coupling nano generator (PTENG) combines the coupling effect of friction electrification and electrostatic induction with the piezoelectric effect, converts mechanical energy in the environment into electric signals for output, has the characteristics of simple structure, low cost, high integration level, excellent performance, various preparation materials and the like, and can be widely used for mechanical energy collection, self-powered sensors and the like. However, the piezoelectric-triboelectric coupling nano-meter in the prior art still has a certain problem of low output amplitude and low force/electric conversion efficiency.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method and application of a piezoelectric-friction electric coupling induction material, wherein HPC, CTS and CNT are adopted to prepare a film which is used for preparing the positive electrode of the piezoelectric-friction electric coupling induction material and has piezoelectric performance, and the film has excellent mechanical performance and signal conversion performance.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for preparing a piezoelectric-triboelectric coupling inductive material, comprising the steps of:
s1: dissolving hydroxypropyl cellulose, chitosan and carbon nano tube in an acid solution to prepare a hydroxypropyl cellulose/chitosan/carbon nano tube solution;
s2: and (3) casting the hydroxypropyl cellulose/chitosan/carbon nanotube solution on a polytetrafluoroethylene substrate for drying to obtain the piezoelectric-triboelectric coupling induction material.
Hydroxypropyl cellulose (HPC) is a potential self-assembled cellulose nano material and has the advantages of low cost, reproducibility, easy mass production, environmental protection, no toxicity and the like; chitosan (CTS) is a product of removing partial acetyl of natural polysaccharide chitin, has the characteristics of biodegradability, biocompatibility, non-toxicity, bacteriostasis and the like, and is widely applied to various fields of food addition, textile, artificial tissue materials, biomedicine and the like; carbon Nanotubes (CNTs) are used as one-dimensional nano materials, have light weight, perfect hexagonal structure connection and excellent mechanical, electrical and chemical properties, and have wide application prospects along with the deep research of the carbon nanotubes and nano materials in recent years. HPC and CTS are high polymer materials with extremely high biocompatibility and have degradability, and the HPC also has certain piezoelectric property, so that the HPC and CTS are taken as raw materials, and a proper amount of CNT is added for coordination and enhancement of mechanical and electrical properties, so that the film with piezoelectric property can be obtained by compounding. The piezoelectric principle is as follows: HPC is a crystal having an asymmetric structure, so that nanocrystalline cellulose in a thin film can be ordered by applying voltage polarization. The film deforms under the action of mechanical force to cause the relative displacement of charged particles, so that the total electric moment of the crystal is changed to generate piezoelectric effect. Also because HPC is positively charged and CTS is protonated by the amino groups under acidic conditions, films cast from HPC/CTS/CNT solutions can also act as positive electrodes for generators.
Specifically, in step S1, the preparation method of the hydroxypropyl cellulose/chitosan/carbon nanotube solution comprises the following steps: dissolving chitosan in an acid solution with the acid concentration of 0.5-1.5%, adding hydroxypropyl cellulose into the acid solution in batches, mixing the acid solution uniformly, and finally adding carbon nano tubes, mixing the acid solution uniformly, wherein the concentration of the chitosan in the hydroxypropyl cellulose/chitosan/carbon nano tube solution is 2-5%, the concentration of the hydroxypropyl cellulose is 9-12%, and the concentration of the carbon nano tubes is 0.5-1%.
In the above technical solution, the acidic solution is glacial acetic acid, carbonic acid, etc., so as to make the CTS amino group protonated and positively charged under acidic condition, so as to form a part of the whole triboelectrification.
Preferably, the hydroxypropyl cellulose is added each time for 15-30 min and sonicated at a temperature below 30 ℃.
Since HPC precipitates at temperatures exceeding 35 ℃, it is necessary to carry out ultrasonic treatment at low temperatures of 30℃or less.
Specifically, after the addition of the hydroxypropyl cellulose is completed and uniformly mixed, standing the solution at 0-10 ℃ for 3-6 hours, after the addition of the carbon nano tube is completed and uniformly mixed, standing the solution at room temperature for 24-30 hours, and then degassing treatment is carried out.
In the above technical solution, the degassing is to remove bubbles. Preferably, centrifugal degassing is adopted, and the treatment condition is 8-12 kpm, 15-30 min.
Specifically, in step S2, the hydroxypropyl cellulose/chitosan/carbon nano tube solution is cast on a polytetrafluoroethylene substrate, the surface of the cast solution is parallel to the substrate, water is dehydrated until the solution is cast into a film, and the film is taken down and polarized after standing for 1-2 hours at room temperature, so that the piezoelectric-triboelectric coupling induction material film is obtained.
In the technical scheme, the water loss adopts a drying mode, the drying temperature is 50-55 ℃, and the water loss time is 6-12 h.
In a piezoelectric-triboelectric coupling sensing material, the relative orientation of the grains is completely disordered, which makes the orientation of the electric domains completely disordered. Therefore, the untreated composite material does not exhibit a piezoelectric effect or exhibits a poor piezoelectric effect, and a suitable electric field must be applied at a suitable temperature to make it monodomain before use, and the monodomain treatment of the crystal is called poling treatment, which is a necessary treatment process for the piezoelectric polymer and the piezoelectric composite material to follow even if the crystal has polarity. The ideal polarization treatment can align the spontaneous polarization of each part of the whole crystal along the electric field direction.
In the invention, the voltage applied by the polarization is 8-15 kV, and the time is 180-360 min.
The second aspect of the invention provides an application of the piezoelectric-friction electric coupling induction material prepared by the method in a piezoelectric-friction electric coupling nano generator, and in particular, the piezoelectric-friction electric coupling induction material is used as a positive electrode material of the piezoelectric-friction electric coupling nano generator.
Further, the piezoelectric-triboelectric coupling nano generator further comprises a negative electrode material, and the preparation method of the negative electrode material comprises the following steps: taking dimethylformamide as a solvent, adding an electronegative piezoelectric polymer accounting for 5-15% of the mass fraction of the dimethylformamide, continuously stirring until the solution becomes transparent, drying, taking out, cooling to room temperature and standing; then adding ethanol with the mass fraction of 100% of dimethylformamide for replacement, and adding deionized water with the mass fraction of 100% of dimethylformamide for replacement to obtain hydrogel; and drying the obtained hydrogel to obtain the aerogel of the electronegative piezoelectric polymer, and finally pressing the aerogel into a film.
In the technical scheme, the HPC/CTS/CNT film and the electronegative piezoelectric polymer film can be separated and output electric signals through continuous contact by applying mechanical stress such as pressure (tapping, re-tapping and bending), and the films are used as carriers of a stimulus-response mechanism, so that signal conversion between force and electricity is realized.
The electronegative piezoelectric polymer is polyvinylidene fluoride, polyvinylidene fluoride trifluoroethylene and the like, and is negatively charged to form a part of the whole friction electrification.
For complete replacement, ethanol replacement and deionized water replacement were each performed multiple times.
The pressure intensity of the pressed film is 5-10 MPa, and the time is 10-20 min.
Preferably, the electronegative piezoelectric polymer solution is poured into a polytetrafluoroethylene mould, sealed and dried. The hydrogel thus prepared was polyvinylidene fluoride (PVDF) hydrogel. The drying temperature is 75-85 ℃ and the drying time is 1.5-3 h.
Through the technical scheme, the invention has the following beneficial effects:
1. the sensing material of the invention adopts HPC, CTS and CNT to prepare the film which is used for the positive electrode of the piezoelectric-triboelectric coupling sensing material and has piezoelectric property by a tape casting method, and has excellent mechanical property and signal conversion property.
2. The piezoelectric-triboelectric coupling induction material prepared by the invention has flexibility, can be used as stress-induced electronic skin, supplies power to the piezoelectric-triboelectric coupling induction material on one hand, and can distinguish the contact pressure of the piezoelectric-triboelectric coupling induction material according to the change of output voltage on the other hand.
3. The continuous contact separation movement between the electronegative piezoelectric polymer film and the electropositive film material of the nano generator enables the cross-superposed multilayer structure to realize continuous alternating current output through external loading, and the piezoelectric-triboelectric coupling sensing material is used as a stimulus-response mechanism carrier, so that force hypersensitive response is realized, the nano generator has high sensitivity and high output conversion performance, different signal outputs can be generated through applying mechanical pressure, a very wide response range is provided, and the pressure of different degrees can be intuitively and accurately detected.
Drawings
FIG. 1 is an output of a piezoelectric-triboelectric coupled nano-generator prepared according to examples and comparative examples of the present invention in a pure frictional state;
FIG. 2 is the output of the piezoelectric-triboelectric coupled nano-generators prepared in examples and comparative examples of the present invention at different pressures;
FIG. 3 is the output of the piezo-triboelectric coupled nano-generators made according to the examples and comparative examples of the present invention at different frequencies;
fig. 4 is an operational circuit of the piezo-triboelectric coupled nano-generator energy storage system made in accordance with the examples and comparative examples of the present invention.
Description of the reference numerals
1 capacitor, 2 rectifier, 3 load
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to examples. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In the following examples, the polytetrafluoroethylene substrate was cut using a polytetrafluoroethylene plate, and the cut substrate was 5cm long, 5mm wide and 1 to 2mm high.
Example 1
S1: 2g of CTS was added to 87.5g of 1.5% strength acetic acid-water solution and stirred magnetically at room temperature until completely dissolved. Then slowly adding 10g of HPC into the solution for 5 times every 30min, performing ultrasonic treatment at room temperature, standing the solution at 10 ℃ for 6h, taking out and placing the solution at room temperature, adding 0.5g of CNT again, magnetically stirring the solution for 3h, standing the solution at room temperature for 24h, and performing centrifugal degassing under the condition of 10kpm for 30min to obtain HPC/CTS/CNT solution;
s2: uniformly casting the HPC/CTS/CNT solution obtained in the step S1 on a smooth and flat polytetrafluoroethylene substrate, enabling the surface of the cast solution to be parallel to the substrate, slowly dehydrating in an oven at the temperature of 55 ℃ for 8 hours until the cast solution is formed into a film, standing at room temperature for 2 hours, taking off the film, and polarizing at the voltage of 12kV for 250 minutes to obtain a film which is used as a triboelectric positive electrode of the piezoelectric-triboelectric coupling sensing material and has piezoelectric performance;
s3: taking dimethylformamide as a solvent, adding polyvinylidene fluoride accounting for 10% of the mass fraction of the dimethylformamide, continuously stirring until the solution becomes transparent, pouring into a polytetrafluoroethylene mould, and then sealing and placing into an oven at 80 ℃ for 3 hours; taking out, cooling to room temperature, standing at room temperature for 12h, adding ethanol with the mass fraction of 100% of dimethylformamide for replacement, sealing, standing for 6h, pouring out, and repeating for 3 times; adding deionized water with the mass fraction of 100% of dimethylformamide, standing for 6 hours after sealing, pouring, repeating for 3 times to obtain PVDF hydrogel, freeze-drying the obtained hydrogel to obtain aerogel, and finally pressing for 15 minutes under the pressure of 10 MPa;
s4: and (3) respectively attaching a copper sheet and a polyimide tape to one surface of the film obtained in S2 and S3, separating the two films by using two sponges (10 x 5 x 2 mm), packaging, and connecting with a capacitor 1 and a rectifier 2 with the specification of 22UF 50V 5 x 11 to obtain the piezoelectric-triboelectric coupling nano generator (shown in figure 4).
Example 2
S1: 5g of CTS was added to 85g of 0.5% strength acetic acid-water solution and magnetically stirred at room temperature for 30min until completely dissolved. Then adding 9g of HPC into the solution slowly for 9 times every 15min, carrying out ultrasonic treatment at room temperature until the concentration reaches 9%, standing the solution at 0 ℃ for 3h, taking out and placing the solution at room temperature, adding 1g of CNT again, magnetically stirring the solution for 2h, standing the solution at room temperature for 30h, and then carrying out centrifugal degassing under 8kpm for 30min to obtain HPC/CTS/CNT solution;
s2: uniformly casting the HPC/CTS/CNT solution obtained in the step S1 on a smooth and flat polytetrafluoroethylene substrate, enabling the surface of the cast solution to be parallel to the substrate, slowly dehydrating in an oven at 50 ℃ for 12 hours until the cast film is formed, standing for 1 hour at room temperature, taking off the film, and polarizing for 360 minutes at 8kV voltage to obtain a film which is used as a triboelectric positive electrode of the piezoelectric-triboelectric coupling sensing material and has piezoelectric performance;
s3: taking dimethylformamide as a solvent, adding polyvinylidene fluoride trifluoroethylene accounting for 5% of the mass fraction of the dimethylformamide, continuously stirring until the solution becomes transparent, pouring into a polytetrafluoroethylene mould, and then sealing and placing into an oven at 75 ℃ for 3 hours. Taking out, cooling to room temperature, standing at room temperature for 24 hours, adding ethanol with the mass fraction of 100% of dimethylformamide for replacement, sealing, standing for 6 hours, pouring out, and repeating for 3 times; adding deionized water with the mass fraction of 100% of dimethylformamide, standing for 6 hours after sealing, pouring, repeating for 3 times to obtain PVDF hydrogel, freeze-drying the obtained hydrogel to obtain aerogel, and finally pressing for 20 minutes under the pressure of 5 MPa.
S4: and (3) respectively attaching a copper sheet and a polyimide tape to one surface of the film obtained in S2 and S3, separating the two films by using two sponges (10 x 5 x 2 mm), packaging, and connecting with a capacitor 1 and a rectifier 2 with the specification of 22UF 50V 5 x 11 to obtain the piezoelectric-triboelectric coupling nano generator (shown in figure 4).
Example 3
The preparation method of the piezoelectric-triboelectric coupling induction material comprises the following steps:
s1: 3g of CTS was added to 84.2g of 1.0% strength acetic acid-water solution and magnetically stirred at room temperature for 45min until completely dissolved. Then adding 12g of HPC into the solution slowly for 6 times every 20min, carrying out ultrasonic treatment at room temperature until the concentration reaches 12%, standing the solution at 5 ℃ for 4h, taking out and placing the solution at room temperature, adding 0.8g of CNT, magnetically stirring the solution for 6h, standing the solution at room temperature for 27h, and carrying out centrifugal degassing under the conditions of 12kpm and 15min to obtain HPC/CTS/CNT solution;
s2: uniformly casting the HPC/CTS/CNT solution obtained in the step S1 on a smooth and flat polytetrafluoroethylene substrate, enabling the surface of the cast solution to be parallel to the substrate, slowly dehydrating in an oven at the temperature of 55 ℃ for 6 hours until the cast film is formed, standing for 2 hours at room temperature, taking off the film, and polarizing for 180 minutes at the voltage of 15kV to obtain a film which is used as a triboelectric positive electrode of the piezoelectric-triboelectric coupling sensing material and has piezoelectric performance;
s3: taking dimethylformamide as a solvent, adding polyvinylidene fluoride accounting for 15% of the mass fraction of the dimethylformamide, continuously stirring until the solution becomes transparent, pouring into a polytetrafluoroethylene mould, and then sealing and placing into an oven at 85 ℃ for 1.5h. Taking out, cooling to room temperature, standing at room temperature for 24 hours, adding ethanol with the mass fraction of 100% of dimethylformamide for replacement, sealing, standing for 6 hours, pouring out, and repeating for 3 times; adding deionized water with the mass fraction of 100% of dimethylformamide, standing for 6 hours after sealing, pouring, repeating for 3 times to obtain PVDF hydrogel, freeze-drying the obtained hydrogel to obtain aerogel, and finally pressing for 10min under the pressure of 10 MPa.
S4: and (3) respectively attaching a copper sheet and a polyimide tape to one surface of the film obtained in S2 and S3, separating the two films by using two sponges (10 x 5 x 2 mm), packaging, and connecting with a capacitor 1 and a rectifier 2 with the specification of 22UF 50V 5 x 11 to obtain the piezoelectric-triboelectric coupling nano generator (shown in figure 4).
Comparative example 1
The positive electrode film of the piezoelectric-triboelectric coupling induction material in example 1 was replaced with a polyester film, and the same as in example 1 was repeated.
Comparative example 2
The electronegative piezoelectric polymer film in example 1 was replaced with a PDMS film, otherwise identical to that in example 1.
Comparative example 3
In 2019, a team of singapore materials research and engineering institute (Agency for Science, technology and Research) Yousry proposed a theoretical model of a piezoelectric and friction composite power generation mechanism based on electrospun PVDF fiber membranes (Yousry Y M, yao K, mohamed a M, et al, theoretical model and outstanding performance from constructive piezoelectric and triboelectric mechanism in electrospun PVDF fiber film [ J ]. Advanced Functional Materials,2020,30 (25): 1910592.). Based on theoretical analysis of the system, the researches establish a theoretical model for clarifying the structure piezoelectric-triode mechanism of the polarized PVDF optical fiber film, thereby well explaining experimental observation results. The electrospinning process causes polarization orientation, thereby modulating the electron affinity of PVDF fibers with different polarization ends, resulting in piezoelectric and tri-electric structural responses of the PVDF fiber films. The output voltage of the generator device is about 4V at the frequency of 100Hz, and compared with the generator device, the generator device has excellent electric signal output performance.
Performance detection
The piezoelectric-triboelectric coupled nano-generators prepared in example 1-example 3 and comparative example 1-comparative example 2 are connected with a load 3 (shown in fig. 4), and the sensitivity and stability of the piezoelectric-triboelectric coupled nano-generator are characterized by controlling the vibration frequency and the pressure (SH-III-500N) through the following specific methods: two conductive tapes were respectively attached to copper sheets of the two films, and then the conductive tapes were connected to conductive clips at both ends of an electrometer (EST 102, beijing hua test laboratory instruments ltd) to measure the voltage of the piezo-triboelectric coupled generator in the pressure mode of operation (as shown in fig. 2). Repeated pressing tests of different pressures are carried out on the piezoelectric-triboelectric coupled generator in the range of 25-150N, and the value and stability of the voltage are observed through the repeated pressing tests. The specific test results are shown in fig. 2-3 and table 1.
TABLE 1 Performance test results
As can be seen from table 1, as the pressure increases, the output voltage of the generator also gradually increases, peaks at 150N, and the stability of the voltage varies little with the increase in pressure.
As can be seen from fig. 2, the test was performed in a pressure range of 25 to 150N, and the variation of the voltage value at different pressures and the stability of the output voltage at the same pressure were observed by repeating the pressing test. It was found that as the pressure increased, the output voltage of the piezo-triboelectric coupled nano-generator also gradually increased, peaking at a pressure of 150N and an output voltage of 20V. The voltage output is stable in whole under the same pressure, which shows that the piezoelectric-triboelectric coupled nano generator is very sensitive to different pressures and has the characteristic of high sensitivity, but the voltage output under the same pressure also has stability.
As shown in fig. 3, repeated experiments were performed at different frequencies by applying the same magnitude of pressure to the piezo-triboelectric coupled nano-generator in the range of 0.75 to 1.25Hz, and stability of the voltage output at different frequencies was observed through the repeated experiments, and it was found that the output voltage of the piezo-triboelectric coupled nano-generator was hardly changed with the increase of frequency, and the output voltage was stabilized in the range of 10V to 11V.
The output voltage in pure triboelectric mode was also measured (as shown in fig. 1), and it can be seen that the output voltage in pure triboelectric mode (5-8V) was much lower than the piezo-triboelectric coupling (6.5-10V) at the same pressure (25-75N).
From the above description, it can be seen that the piezoelectric-triboelectric coupled nano generator of the present invention has superior output performance and extremely strong stability, and can stably and intuitively display the change of external pressure with a certain sensitivity while outputting voltage. In addition, the invention is flexible and can be used as a stress-induced electronic skin or sensor, which is powered on the one hand and which can distinguish the pressure with which it is in contact according to the change in output voltage on the other hand.
The preferred embodiments of the present invention have been described in detail above with reference to the examples, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solutions of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (10)
1. The preparation method of the piezoelectric-triboelectric coupling induction material is characterized by comprising the following steps of:
s1: dissolving hydroxypropyl cellulose, chitosan and carbon nano tube in an acid solution to prepare a hydroxypropyl cellulose/chitosan/carbon nano tube solution;
s2: and (3) casting the hydroxypropyl cellulose/chitosan/carbon nanotube solution on a polytetrafluoroethylene substrate for drying to obtain the piezoelectric-triboelectric coupling induction material.
2. The method for preparing a piezoelectric-triboelectric coupling sensing material according to claim 1, wherein in step S1, the method for preparing the hydroxypropyl cellulose/chitosan/carbon nanotube solution comprises: dissolving chitosan in an acid solution with the acid concentration of 0.5-1.5%, then adding hydroxypropyl cellulose into the solution in batches, uniformly mixing the solution, and finally adding carbon nano tubes and uniformly mixing the solution; the concentration of chitosan in the hydroxypropyl cellulose/chitosan/carbon nano tube solution is 2-5%, the concentration of hydroxypropyl cellulose is 9-12%, and the concentration of carbon nano tube is 0.5-1%.
3. The method of preparing a piezoelectric-triboelectric coupling sensing material according to claim 2, wherein each time the hydroxypropyl cellulose is added for 15-30 min, and the ultrasonic treatment is performed at a temperature lower than 30 ℃.
4. The method for preparing a piezoelectric-triboelectric coupling induction material according to claim 2, wherein the solution is allowed to stand at 0-10 ℃ for 3-6 hours after the completion of the addition and the uniform mixing of the hydroxypropyl cellulose, and the solution is allowed to stand at room temperature for 24-30 hours after the completion of the addition and the uniform mixing of the carbon nanotubes, and then subjected to degassing treatment.
5. The method for preparing a piezoelectric-triboelectric coupling induction material according to claim 1, wherein in the step S2, a solution of hydroxypropyl cellulose/chitosan/carbon nanotube is cast on a polytetrafluoroethylene substrate, the surface of the cast solution is parallel to the substrate, water is lost until the casting is carried out to form a film, and the film is taken off and polarized after standing for 1-2 hours at room temperature to obtain the piezoelectric-triboelectric coupling induction material film.
6. The method for preparing a piezoelectric-triboelectric coupling induction material according to claim 5, wherein the voltage applied by the polarization is 8-15 kV for 180-360 min.
7. Use of a piezoelectric-triboelectric coupling induction material prepared according to any one of claims 1 to 6 in a piezoelectric-triboelectric coupling nano-generator, characterized in that the piezoelectric-triboelectric coupling induction material is used as a positive electrode material of the piezoelectric-triboelectric coupling nano-generator.
8. The use of claim 7, wherein the piezoelectric-triboelectric coupled nano-generator further comprises a negative electrode material, the preparation method of the negative electrode material is as follows: taking dimethylformamide as a solvent, adding an electronegative piezoelectric polymer accounting for 5-15% of the mass fraction of the dimethylformamide, continuously stirring until the solution becomes transparent, drying, taking out, cooling to room temperature and standing; then adding ethanol with the mass fraction of 100% of dimethylformamide for replacement, and adding deionized water with the mass fraction of 100% of dimethylformamide for replacement to obtain hydrogel; and drying the obtained hydrogel to obtain the aerogel of the electronegative piezoelectric polymer, and finally pressing the aerogel into a film.
9. The use according to claim 8, wherein the electronegative piezoelectric polymer solution is poured into a polytetrafluoroethylene mould, sealed and baked.
10. The use according to claim 8, wherein the electronegative piezoelectric polymer is polyvinylidene fluoride or polyvinylidene fluoride trifluoroethylene.
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