CN108511598B - PVDF/graphene flexible piezoelectric material and preparation method of flexible piezoelectric generator thereof - Google Patents
PVDF/graphene flexible piezoelectric material and preparation method of flexible piezoelectric generator thereof Download PDFInfo
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Abstract
The invention provides a preparation method of a PVDF/graphene flexible piezoelectric material, which comprises the following steps: step S1: dissolving a PVDF polymer in an organic solvent to obtain a PVDF polymer solution, and adding a graphene dispersion liquid to obtain a uniform graphene/PVDF polymer dispersion liquid; step S2: and infiltrating a load fiber material into the PVDF/graphene dispersion liquid, immersing the load fiber material in a phase separation agent, and drying to obtain the cured PVDF/graphene piezoelectric material. The invention also provides a method for preparing the PVDF/graphene flexible piezoelectric generator by using the piezoelectric material. According to the preparation method, the rapid solidification is realized by utilizing the phase separation, the polarization is promoted by utilizing the graphene and the phase separation, the method is simple, convenient and efficient, and the piezoelectric performance of the prepared PVDF/graphene flexible piezoelectric generator is improved.
Description
Technical Field
The invention relates to the field of piezoelectric energy conversion, in particular to a flexible piezoelectric power generation material and a preparation method of a piezoelectric generator.
Background
The piezoelectric generator is a device for converting mechanical energy into electric energy by utilizing a piezoelectric effect, and the flexible piezoelectric generator enables the collection of human motion energy. With the advent of wearable devices, more and more people have conceived the use of flexible piezoelectric devices as an energy source for wearable devices. Common piezoelectric materials such as lead titanate, zinc oxide and the like have heavy metals harmful to human bodies or rigidity, and flexible devices are difficult to prepare. Polyvinylidene fluoride (PVDF) or polyvinylidene fluoride (PVDF) is a flexible polymer material with piezoelectric property, is non-toxic, harmless and good in chemical stability, and has been used for preparing flexible piezoelectric devices, for example, an electrostatic spinning method is reported in 2017 ACS Nano No 11, volume 5, Polymeric Nanofibrers with ultra high piezoelectric property, Self-ionization of Nanocrystals by Liu summer et al, and PVDF nanowires with high piezoelectric coefficient are prepared, but high voltage polarization is needed, and energy consumption is high. In a nanoconceptin, an Effective Way to an enhanced PVDF Piezoelectric Properties published in an ACS applied materials & Interfaces journal of 2013 by Valentina Cauda et al, the preparation of a PVDF nano column of a high-voltage electric phase by using an alumina template is reported, but the price of the alumina template is high, the template is consumed when the PVDF nano column is taken out, so that the waste is caused, the efficiency is low, and the rapid and continuous preparation cannot be realized.
In 2016, Sumanta Kumar Karan et al added graphene oxide and alumina into PVDF, and prepared a PVDF piezoelectric device (Advanced energy materials2016,1601016) with high energy conversion efficiency by using PMMA (polymethyl methacrylate) as a substrate, but the existing alumina, graphene oxide and alumina all utilize the interaction of metal cations and fluorine in PVDF to induce molecular orientation to form a polarization structure (β or gamma phase), and the preparation method cannot be rapidly shaped, thereby reducing the preparation efficiency of the device.
Houcheng et al (CN106370221A) disclose a method for preparing a self-response PVDF/graphene/elastic fabric composite sensor, which uses a fiber structure to load graphene and PVDF to enhance current output, but in order to obtain PVDF in a piezoelectric phase, a high voltage polarization field is required, thereby requiring a large amount of energy consumption.
As can be seen from the above, the existing methods for manufacturing flexible piezoelectric generators have the problems of low efficiency, high energy consumption, and the like, and therefore, it is an urgent need to develop a method for manufacturing an energy-saving and efficient flexible piezoelectric generator.
Disclosure of Invention
The invention aims to provide a preparation method of a PVDF/graphene flexible piezoelectric material and a flexible piezoelectric generator thereof, so as to improve the production efficiency of the PVDF/graphene flexible piezoelectric material, reduce energy consumption, improve the piezoelectric crystal form content of the prepared PVDF/graphene flexible piezoelectric generator and improve the piezoelectric output performance of the PVDF/graphene flexible piezoelectric generator.
In order to achieve the above object, the present invention provides a method for preparing a PVDF/graphene flexible piezoelectric material, comprising: step S1: dissolving a PVDF polymer in an organic solvent to obtain a PVDF polymer solution, and adding a graphene dispersion liquid to obtain a uniform graphene/PVDF polymer dispersion liquid; step S2: and infiltrating a load fiber material into the PVDF/graphene dispersion liquid, immersing the load fiber material in a phase separation agent, and drying to obtain the cured PVDF/graphene flexible piezoelectric material.
And uniformly mixing the PVDF polymer solution and the graphene dispersion liquid in the step S1 by ultrasonic.
In step S2, the impregnation or spraying method is used to complete the impregnation of the PVDF/graphene dispersion into the loaded fiber material.
The drying temperature of the step S2 is 40-120 ℃.
The PVDF polymer is one of PVDF and modified PVDF.
The organic solvent is N-methyl pyrrolidone or dimethylformamide.
The load fiber is plant fiber or artificial fiber.
The phase separating agent is water, salt solution or mixture of water and alcohol solvent.
The mass percentage of the PVDF polymer in the organic solvent is 1-10%, and the solid content of the graphene relative to the PVDF polymer is 0.01-3%.
In addition, the invention also provides a preparation method of the PVDF/graphene flexible piezoelectric generator, which is characterized by comprising the following steps: step S1: providing the PVDF/graphene piezoelectric material prepared by the preparation method of the PVDF/graphene flexible piezoelectric material; step S2: and arranging flexible conductive current collectors on two sides of the PVDF/graphene piezoelectric material in the step S1, and packaging to obtain the PVDF/graphene flexible piezoelectric generator.
According to the invention, the phase separation agent is utilized to realize the rapid solidification of the PVDF/graphene flexible piezoelectric material, so that the preparation process of the PVDF/graphene flexible piezoelectric material is simple and rapid, and the production efficiency is improved. Because no external electric field is needed, large-scale special instruments such as an electrostatic spinning machine, a high-voltage polarization power supply and the like are not needed, and the energy consumption is reduced. Meanwhile, the preparation process is completely carried out in a water phase, so that the environment-friendly cost is low.
According to the invention, the hydrogen bonds in the phase separating agent are utilized to polarize fluorine in PVDF, the large pi bond of graphene is utilized to induce PVDF polarization, and the polarization mechanism is different from the polarization mechanism of the existing method of inducing molecular orientation to form polarization by utilizing the interaction of metal cations and fluorine in PVDF, the combined action of graphene and phase separation improves the piezoelectric crystal form content, so that the preparation of PVDF/graphene flexible piezoelectric material is more efficient and faster, the piezoelectric voltage generated by the prepared PVDF/graphene flexible piezoelectric generator is higher, the energy density is higher, and the piezoelectric output performance of the generator is improved.
The substrate adopted by the invention is paper or fiber cloth with a porous structure or a textile structure, and the piezoelectric output performance of the PVDF/graphene flexible piezoelectric generator is greatly improved by utilizing the large specific surface area of the textile structure, and meanwhile, the flexibility of the raw materials is kept.
Drawings
Fig. 1 is a low-power scanning electron microscope image of a PVDF/graphene flexible piezoelectric material prepared according to example 1 of the invention;
FIG. 2 is a high-power scanning electron microscope image of a PVDF/graphene flexible piezoelectric material prepared according to example 1 of the present invention;
fig. 3 is an assembled circuit diagram of an oscilloscope after a PVDF/graphene flexible piezoelectric material prepared according to embodiment 2 of the invention is integrated with a current collector;
fig. 4A is a voltage versus time plot across a PVDF/graphene flexible piezoelectric generator made according to example 2 of the invention, where the voltage is formed by finger pressure;
FIG. 4B is a partial enlarged view of a portion of the dashed-line frame of FIG. 4A;
fig. 5 is a graph of the short-circuit current generated by the PVDF/graphene flexible piezoelectric generator prepared according to example 2 of the invention when bending versus time;
fig. 6A-6B are comparative photographs of a PVDF/graphene piezoelectric material prepared according to example 3 of the present invention before and after preparation, wherein fig. 6A is a face paper before preparation, and fig. 6B is the piezoelectric material obtained;
fig. 7 is a graph of voltage versus time across a PVDF/graphene flexible piezoelectric generator made according to example 3 of the present invention, where the voltage is generated by the face paper under pressure.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.
The PVDF/graphene flexible piezoelectric generator is prepared on the basis of the following principle:
the PVDF has four crystal forms of α, gamma and theta, wherein only β and gamma have piezoelectric effect, so that the PVDF with high β content is prepared, and the key for improving the piezoelectric performance is that the PVDF with high crystalline phase content is prepared by utilizing a phase separation method, and a high-orientation ordered structure is obtained due to the hydrogen bond action generated by hydrogen atoms in a phase separation agent and fluorine atoms on a PVDF molecular chain.
Example 1 preparation of PVDF/graphene Flexible piezoelectric Generator
Step S1: weighing 2.5g of PVDF, dissolving the PVDF in 100ml of NMP (N-methyl pyrrolidone) solvent by stirring to obtain a PVDF solution (the mass percent of the PVDF in the NMP solvent is 2.5%), then weighing 3ml of 20mg/ml graphene dispersion liquid (the solid content of the graphene relative to the PVDF is 3%), and putting the PVDF solution and the graphene dispersion liquid together into an ultrasonic pool to perform ultrasonic dispersion for more than 30min to obtain a uniform graphene/PVDF dispersion liquid. Wherein the oxygen content of the graphene in the graphene dispersion liquid is 0-30%, and the transverse dimension is 0.1-100 μm.
Step S2: cutting the dust-free cloth (made of polyester fiber) for the laboratory into 5cm and 5cm, cleaning with deionized water and isopropanol, and drying for later use. Wherein, the dust-free cloth is one of artificial fibers. And immersing the cleaned dust-free cloth in the PVDF/graphene dispersion liquid obtained in the step S1, and taking out the dust-free cloth after the dust-free cloth is fully absorbed by the dispersion liquid, so as to obtain the dust-free cloth loaded with the PVDF/graphene dispersion liquid. The excess dispersion was then wiped off the dust-free cloth and placed flat in deionized water, which served to phase separate the NMP in the dispersion into the water quickly. And after soaking in water for 1 minute, namely dissolving most of NMP solvent in water, taking out the solidified PVDF/graphene loaded dust-free cloth, and putting the cloth into an oven to dry at the temperature of 40 ℃ to obtain the PVDF/graphene flexible piezoelectric material.
Step S3: and cutting 2 aluminum foils with the same shape as the PVDF/graphene flexible piezoelectric material as current collectors, respectively attaching the current collectors to two sides of the PVDF/graphene piezoelectric material, and finally packaging and fixing to obtain the PVDF/graphene flexible piezoelectric generator.
Fig. 1 is a scanning electron microscope image of PVDF/graphene flexible piezoelectric material prepared according to example 1 of the present invention, and it can be seen that the dust-free cloth is an intertwined textile structure with many small holes and slits therein. Fig. 2 is a high-power scanning electron microscope image of the PVDF/graphene flexible piezoelectric material prepared in example 1 of the present invention, and it can be seen from the image that the surface of the dust-free cloth is uniformly covered with the PVDF/graphene polymer film.
Embodiment 2 preparation of PVDF/graphene Flexible piezoelectric Generator
Step S1: a uniform PVDF/graphene dispersion was obtained in the same manner as in example 1.
Step S2: similarly, the dust-free cloth (made of polyester fiber) for the laboratory is cut into 5cm and 5cm, washed by deionized water and isopropanol and dried for later use. Here, the PVDF/graphene dispersion liquid obtained in step S1 is sprayed on the dust-free cloth by using a spray gun, and the dust-free cloth is taken out after the dust-free cloth is saturated with the dispersion liquid, so as to obtain the dust-free cloth loaded with the PVDF/graphene dispersion liquid. The excess dispersion was then wiped off the dust-free cloth and placed flat in deionized water, which served to phase separate the NMP in the dispersion into the water quickly. And after soaking in water for 1 minute, namely dissolving most of NMP solvent in water, taking out the solidified PVDF/graphene loaded dust-free cloth, and putting the cloth into an oven to dry at the temperature of 120 ℃ to obtain the PVDF/graphene flexible piezoelectric material.
Step S3: and cutting 2 aluminum foils with the same shape as the PVDF/graphene flexible piezoelectric material as current collectors, respectively attaching the current collectors to two sides of the PVDF/graphene piezoelectric material, and finally packaging and fixing to obtain the PVDF/graphene flexible piezoelectric generator.
Fig. 3 is a circuit diagram of an assembly of a PVDF/graphene flexible piezoelectric generator and an oscilloscope prepared according to example 2 of the present invention, which can be used to measure voltage output. Fig. 4A is a voltage versus time curve across a PVDF/graphene flexible piezoelectric generator prepared according to example 2 of the present invention, where the voltage is formed by finger pressing, which is the time when the voltage is generated; fig. 4B is a partially enlarged view of a dotted frame portion of fig. 4A. As is apparent from fig. 4A and 4B: with the finger pressing, a voltage greater than 10V can be generated across the PVDF/graphene flexible piezoelectric generator of this embodiment. Fig. 5 is a graph of the short circuit current generated by the PVDF/graphene flexible piezoelectric generator prepared according to example 2 of the present invention when bent versus time. As shown in fig. 5, the current peak can reach 0.8 μ a.
Example 3 preparation of PVDF/graphene Flexible piezoelectric Generator
Step S1: weighing 2.5g of PVDF, dissolving the PVDF in 100ml of DMF (dimethyl formamide) solvent (the mass percent of the PVDF in the DMF solvent is 2.5%) by stirring to obtain a PVDF solution, then weighing 3ml of 20mg/ml graphene dispersion liquid (the solid content of graphene relative to the PVDF is 3%), putting the PVDF solution and the graphene dispersion liquid together into an ultrasonic pool, and performing ultrasonic dispersion for more than 30min to obtain a uniform PVDF/graphene dispersion liquid.
Step S2: household facial tissue was cut into 5 x 5cm small squares. Wherein the household facial tissue is one of vegetable fibers. And spreading the PVDF/graphene dispersion liquid obtained in the step S1 on the surface paper by using an immersion method, wiping redundant dispersion liquid after the surface paper is saturated with the dispersion liquid, and flatly placing the dispersion liquid in deionized water, wherein the deionized water plays a role in phase separation, so that DMF in the dispersion liquid is quickly diffused into water. And after soaking in water for 5 minutes, namely dissolving most of DMF (dimethyl formamide) serving as a solvent in the water, taking out the cured PVDF/graphene loaded facial tissue, and finally putting the facial tissue into an oven to dry at the temperature of 80 ℃ to obtain the PVDF/graphene flexible piezoelectric material.
Step S3: and cutting 2 aluminum foils with the same shape as the PVDF/graphene flexible piezoelectric material as current collectors, respectively attaching the current collectors to two sides of the PVDF/graphene piezoelectric material, and finally packaging and fixing to obtain the PVDF/graphene flexible piezoelectric generator.
Fig. 6A-6B are comparative photographs of the PVDF/graphene piezoelectric material prepared according to example 3 of the present invention before and after preparation, wherein fig. 6A is the face paper before preparation, and fig. 6B is the piezoelectric material obtained, and it can be seen that the color changes from white (as shown in fig. 6A) to gray (as shown in fig. 6B). Fig. 7 is a graph of voltage versus time across a PVDF/graphene flexible piezoelectric generator made according to example 3 of the present invention, where the voltage is generated by the face paper under pressure, and the peak value can reach over 26V. This shows that the substrate of the PVDF/graphene flexible piezoelectric generator of the present invention is not limited to woven fabric, but may be any fiber insoluble in organic solvent.
Example 4 preparation of modified PVDF/graphene Flexible piezoelectric Material
Step S1: weighing 2.5g of PVDF and 0.2g of PDMS (polydimethylsiloxane), dissolving the PVDF and the PDMS in 100ml of DMF solvent by stirring to obtain a PVDF-PDMS solution (the mass percent of the PVDF in the NMP solvent is 2.5%), then weighing 3ml of 20mg/ml graphene dispersion liquid (the solid content of the graphene relative to the PVDF is 3%), and putting the PVDF-PDMS solution and the graphene dispersion liquid together into an ultrasonic pool for ultrasonic dispersion for more than 30min to obtain a uniform PVDF-PDMS/graphene dispersion liquid. Among them, addition of PDMS to PVDF can modify PVDF, so that PVDF-PDMS is a modified PVDF.
Step S2: the absorbent paper was cut to 5 × 5 cm. And immersing the water-absorbing paper in the PVDF-PDMS/graphene dispersion liquid obtained in the step S1, and taking out the water-absorbing paper after the water-absorbing paper is saturated with the dispersion liquid, so as to obtain the water-absorbing paper loaded with the PVDF-PDMS/graphene dispersion liquid. Excess dispersion on the absorbent paper was then wiped and placed flat in deionized water which served to phase separate the NMP in the dispersion into the water quickly. And after soaking in water for 1 minute, namely dissolving most of NMP solvent in water, taking out the cured PVDF-PDMS/graphene loaded absorbent paper, and putting the absorbent paper into an oven to dry at the temperature of 80 ℃ to obtain the modified PVDF/graphene flexible piezoelectric material.
Example 5 preparation of PVDF/graphene Flexible piezoelectric Generator
Step S1: weighing 10g of PVDF, dissolving the PVDF in 100ml of NMP solvent by stirring to obtain a PVDF solution (the mass percentage of the PVDF in the NMP solvent is 10%), then weighing 4ml of 0.25mg/ml graphene dispersion liquid (the solid content of graphene relative to the PVDF is 0.01%), putting the PVDF solution and the graphene dispersion liquid together into an ultrasonic pool, and performing ultrasonic dispersion for more than 30min to obtain a uniform PVDF/graphene dispersion liquid.
Step S2: cutting linen into 5 × 5cm, washing with deionized water and isopropanol, and oven drying. Wherein the linen is one of the plant fibers. And spraying the PVDF/graphene dispersion liquid obtained in the step S1 on the linen by using a spray gun, taking out the linen after the linen is fully absorbed by the dispersion liquid, and thus obtaining the linen loaded with the PVDF/graphene dispersion liquid. Excess dispersion was then wiped off the scrim and placed flat in deionized water. And after soaking in water for 1 minute, namely dissolving most of NMP solvent in water, taking out the cured PVDF/graphene loaded linen, and putting the linen into an oven to be dried at the temperature of 80 ℃ to obtain the PVDF/graphene flexible piezoelectric material.
Step S3: and cutting 2 gold foils with the same shape as the PVDF/graphene flexible piezoelectric material as current collectors, respectively attaching the current collectors to two sides of the PVDF/graphene piezoelectric material, and finally packaging and fixing to obtain the PVDF/graphene flexible piezoelectric generator.
Example 6 preparation of PVDF/graphene Flexible piezoelectric Generator
Step S1: weighing 2.5g of PVDF, dissolving the PVDF in 100ml of NMP solvent by stirring to obtain a PVDF solution (the mass percentage of the PVDF in the NMP solvent is 2.5%), then weighing 1ml of 0.25mg/ml graphene dispersion liquid (the solid content of graphene is 3% relative to the PVDF), and putting the PVDF solution and the graphene dispersion liquid together into an ultrasonic pool to perform ultrasonic dispersion for more than 30min to obtain a uniform PVDF/graphene dispersion liquid.
Step S2: cutting cotton cloth for laboratory use into 5 × 5cm, washing with deionized water and isopropanol, and oven drying. Wherein the cotton cloth is one of plant fiber. And spraying the PVDF/graphene dispersion liquid obtained in the step S1 on cotton cloth by using a spray gun, and taking out the cotton cloth after the cotton cloth is fully absorbed by the dispersion liquid, so as to obtain the cotton cloth loaded with the PVDF/graphene dispersion liquid. The cotton cloth was then wiped of excess dispersion and placed flat in an aqueous solution of ethanol (1: 1). And soaking in an ethanol water solution for 1 minute, namely dissolving most of NMP solvent in water, taking out the solidified PVDF/graphene loaded cotton cloth, and putting the cotton cloth into an oven to dry at the temperature of 80 ℃ to obtain the PVDF/graphene flexible piezoelectric material.
Step S3: and cutting 2 copper foils with the same shape as the PVDF/graphene flexible piezoelectric material as current collectors, respectively attaching the current collectors to two sides of the PVDF/graphene piezoelectric material, and finally packaging and fixing to obtain the PVDF/graphene flexible piezoelectric generator.
Example 7 preparation of PVDF/graphene Flexible piezoelectric Material
Step S1: weighing 2.5g of PVDF, dissolving the PVDF in 100ml of NMP solvent by stirring to obtain a PVDF solution (the mass percentage of the PVDF in the NMP solvent is 2.5%), then weighing 1ml of 0.25mg/ml graphene dispersion liquid (the solid content of graphene is 3% relative to the PVDF), and putting the PVDF solution and the graphene dispersion liquid together into an ultrasonic pool to perform ultrasonic dispersion for more than 30min to obtain a uniform PVDF/graphene dispersion liquid.
Step S2: cutting the dust-free cloth (made of polyester fiber) for the laboratory into 5cm and 5cm, cleaning with deionized water and isopropanol, and drying for later use. And spraying the PVDF/graphene dispersion liquid obtained in the step S1 on the dust-free cloth by using a spray gun, and taking out the dust-free cloth after the dust-free cloth is fully absorbed by the dispersion liquid, so as to obtain the dust-free cloth loaded with the PVDF/graphene dispersion liquid. Subsequently, the excess dispersion on the dust-free cloth was wiped off and placed flatly in an aqueous solution of sodium chloride (sodium chloride concentration: 1 mol/L). And after soaking in a salt solution for 1 minute, namely dissolving most of NMP solvent in the solution, taking out the solidified PVDF/graphene loaded dust-free cloth, and putting the cloth into an oven to dry at the temperature of 80 ℃ to obtain the PVDF/graphene flexible piezoelectric material.
Example 8 preparation of PVDF/graphene Flexible piezoelectric Material
Step S1: weighing 1g of PVDF, dissolving the PVDF in 100ml of NMP solvent by stirring to obtain a PVDF solution (the mass percentage of the PVDF in the NMP solvent is 1%), then weighing 4ml of 0.25mg/ml graphene dispersion liquid (the solid content of graphene relative to the PVDF is 0.1%), and putting the PVDF solution and the graphene dispersion liquid together into an ultrasonic pool for ultrasonic dispersion for more than 30min to obtain a uniform PVDF/graphene dispersion liquid.
Step S2: cutting the dust-free cloth (made of polyester fiber) for the laboratory into 5cm and 5cm, cleaning with deionized water and isopropanol, and drying for later use. And spraying the PVDF/graphene dispersion liquid obtained in the step S1 on the dust-free cloth by using a spray gun, and taking out the dust-free cloth after the dust-free cloth is fully absorbed by the dispersion liquid, so as to obtain the dust-free cloth loaded with the PVDF/graphene dispersion liquid. The excess dispersion was then wiped off the dust-free cloth and placed flat in deionized water. And after soaking in water for 1 minute, namely dissolving most of NMP solvent in water, taking out the solidified PVDF/graphene loaded dust-free cloth, and putting the cloth into an oven to dry at the temperature of 80 ℃ to obtain the PVDF/graphene flexible piezoelectric material.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.
Claims (9)
1. A preparation method of a PVDF/graphene flexible piezoelectric generator is characterized by comprising the following steps:
step S1: providing a PVDF/graphene flexible piezoelectric material;
the preparation method of the PVDF/graphene flexible piezoelectric material comprises the following steps:
step S11: dissolving a PVDF polymer in an organic solvent to obtain a PVDF polymer solution, and adding a graphene dispersion liquid to obtain a uniform graphene/PVDF polymer dispersion liquid;
step S12: soaking a load fiber material in the PVDF/graphene dispersion solution, immersing the load fiber material in a phase separation agent, and drying to obtain a cured PVDF/graphene flexible piezoelectric material;
step S2: and arranging flexible conductive current collectors on two sides of the PVDF/graphene flexible piezoelectric material in the step S1, and packaging to obtain the PVDF/graphene flexible piezoelectric generator.
2. The method for preparing a PVDF/graphene flexible piezoelectric generator as claimed in claim 1, wherein the PVDF polymer solution and the graphene dispersion solution of step S11 are mixed uniformly by ultrasound.
3. The method for preparing the PVDF/graphene flexible piezoelectric generator according to claim 1, wherein in step S12, the PVDF/graphene dispersion solution is impregnated with the fiber-loaded material by using an impregnation method or a spraying method.
4. The preparation method of the PVDF/graphene flexible piezoelectric generator as claimed in claim 1, wherein the drying temperature of step S12 is 40-120 ℃.
5. The preparation method of the PVDF/graphene flexible piezoelectric generator as claimed in claim 1, wherein the PVDF polymer is one of PVDF and modified PVDF.
6. The method for preparing a PVDF/graphene flexible piezoelectric generator according to claim 1, wherein the organic solvent is N-methylpyrrolidone or dimethylformamide.
7. The preparation method of the PVDF/graphene flexible piezoelectric generator as claimed in claim 1, wherein the load fiber is a plant fiber or an artificial fiber.
8. The method for preparing a PVDF/graphene flexible piezoelectric generator as defined in claim 1, wherein the phase separation agent is water, a salt solution, or a mixture of water and an alcohol solvent.
9. The method for preparing a PVDF/graphene flexible piezoelectric generator as claimed in claim 1, wherein the mass percentage of the PVDF polymer in the organic solvent is 1-10%, and the solid content of the graphene relative to the PVDF polymer is 0.01-3%.
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| TWI830926B (en) * | 2020-06-19 | 2024-02-01 | 國立臺灣科技大學 | Electrical responsive graphene-pvdf material and the manufacturing method thereof |
| CN112216787B (en) * | 2020-09-22 | 2023-04-07 | 电子科技大学 | Flexible piezoelectric generator based on PVDF/DAST composite fiber material and preparation method thereof |
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