CN112532106A - Flexible piezoelectric energy collector based on macroscopic graphene film negative Poisson ratio structure - Google Patents
Flexible piezoelectric energy collector based on macroscopic graphene film negative Poisson ratio structure Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 87
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000002033 PVDF binder Substances 0.000 claims description 7
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 7
- 229910002113 barium titanate Inorganic materials 0.000 claims description 3
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 229910052451 lead zirconate titanate Inorganic materials 0.000 claims description 3
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 description 10
- 239000012528 membrane Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010147 laser engraving Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003306 harvesting Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- -1 good flexibility Chemical compound 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- 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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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/05—Manufacture of multilayered piezoelectric or electrostrictive devices, or parts thereof, e.g. by stacking piezoelectric bodies and electrodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/50—Piezoelectric or electrostrictive devices having a stacked or multilayer structure
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
- H10N30/877—Conductive materials
Abstract
The invention relates to a flexible piezoelectric energy collector based on a macroscopic graphene film negative Poisson's ratio structure, which comprises a macroscopic graphene film and a flexible piezoelectric material, wherein a plurality of long and thin through holes are uniformly formed in the macroscopic graphene film, and the macroscopic graphene film and the flexible piezoelectric material are arranged in a staggered and stacked mode. The elongated through holes comprise horizontal through holes and vertical through holes, the horizontal through holes in the same row are located on the same straight line, a first gap is reserved between every two adjacent through holes, the vertical through holes are provided with a plurality of rows, the vertical through holes in the same row are located on the same straight line, a second gap is reserved between every two adjacent through holes, and the horizontal through holes are located in the second gap. According to the invention, the graphene film is provided with the holes, so that the apparent Poisson ratio and Young modulus of the whole structure can be adjusted in a wide range, the apparent Poisson ratio can be minimum and can be close to a theoretical limit value of-1, and the negative Poisson ratio structure based on the macroscopic graphene film is applied to the flexible piezoelectric energy collector, so that the electrical output performance of the device can be obviously improved.
Description
Technical Field
The invention relates to the technical field of graphene materials, in particular to a flexible piezoelectric energy collector based on a macroscopic graphene film negative Poisson's ratio structure.
Background
The graphene is represented by sp2Two-dimensional materials formed by covalent bonding of hybrid carbon atoms have received extensive attention and research due to their unique physicochemical properties. The macroscopic graphene film formed by stacking and assembling the graphene not only retains the excellent properties of the graphene, such as good flexibility, extremely high electric conductivity and thermal conductivity, but also has a relatively macroscopic material form, thereby providing convenience for the application of a specific occasion. The negative poisson's ratio effect refers to the material or structure expanding laterally when uniaxially stretched. For the macroscopic graphene membrane material, the existing excellent performance is maintained, the mechanical property of the negative Poisson ratio is further endowed, and the application field of the macroscopic graphene membrane is expected to be expanded. At present, a method for introducing a negative poisson ratio effect into a macroscopic graphene film mainly utilizes the control of forming a micro-wrinkle on a graphene sheet in the process of preparing the macroscopic graphene film [ nat. Commun.,2019,10, 2446; carbon,2020,162,545-551]The method has complex process, is difficult to accurately control the mechanical property of the macroscopic graphene film, and has limited adjustable range of the negative poisson ratio.
The piezoelectric energy collection is based on the piezoelectric effect principle, collects a small amount of useless mechanical energy in the environment, converts the mechanical energy into useful electric energy, and can provide a novel green and environment-friendly power supply for low-power-consumption electronic devices. With the development of low-power-consumption technology of electronic devices and the wide market prospect of consumer wearable intelligent electronic products, the flexible piezoelectric energy collector suitable for wearable application also shows huge development potential. At present, most flexible piezoelectric energy collecting devices have low electrical output performance and are difficult to meet the application requirements of electronic devices. Introducing the negative poisson's ratio effect into the piezoelectric energy harvesting device is an effective method for improving the electrical output performance of the piezoelectric energy harvesting device. However, most of the negative poisson's ratio structures currently used in the field of piezoelectric energy harvesting are based on rigid materials, and are difficult to apply in flexible devices [ AIP adv, 2017,7, 015104; sens. activators A,2018,282,90-96 ]. Therefore, the development of a negative poisson ratio structure based on the macroscopic graphene film and having flexibility, high conductivity and a negative poisson ratio effect has great significance for the high-performance development of the flexible piezoelectric energy collector and the promotion of the application of the flexible piezoelectric energy collector in wearable electronics.
Disclosure of Invention
Aiming at the technical problem to be solved, the invention provides a flexible piezoelectric energy collector based on a macroscopic graphene film negative Poisson's ratio structure.
The technical scheme for solving the technical problems is as follows:
the flexible piezoelectric energy collector based on the macroscopic graphene film negative Poisson's ratio structure comprises a macroscopic graphene film and a flexible piezoelectric material, wherein a plurality of long and thin through holes are uniformly formed in the macroscopic graphene film, and the macroscopic graphene film and the flexible piezoelectric material are arranged in a staggered and stacked mode.
Further, the aspect ratio of the elongated through holes is not less than 2, the elongated through holes comprise horizontal through holes and vertical through holes, the horizontal through holes are provided with a plurality of rows, the horizontal through holes in the same row are located on the same straight line, first gaps are reserved between the adjacent through holes, the vertical through holes are provided with a plurality of columns, the vertical through holes in the same column are located on the same straight line, second gaps are reserved between the adjacent through holes, the vertical through holes are located in the first gaps, and the horizontal through holes are located in the second gaps.
Further, the midpoint of the vertical through hole is located in the first gap, and the midpoint of the horizontal through hole is located in the second gap.
Further, the distance between two adjacent rows of horizontal through holes is equal, and the distance between two adjacent columns of vertical through holes is equal.
Further, the shape of the elongated through hole is oval, round-corner rectangle or diamond.
Further, all the first gaps are equal, and all the second gaps are equal.
Further, the piezoelectric material is any one or more of an inorganic piezoelectric material based on lead zirconate titanate or barium titanate, a polymer piezoelectric material based on polyvinylidene fluoride and copolymers thereof, and a piezoelectric composite material.
Further, the macroscopic graphene film has the thickness of 10-50 μm, the Young modulus of 0.1-20GPa and the conductivity of 104-106S/m。
The invention has the beneficial effects that: the negative Poisson ratio structure of the macroscopic graphene film is obtained by further processing on the basis of the macroscopic graphene film, the process is simple, the mechanical property is high in designability, the apparent Poisson ratio and the Young modulus of the whole structure can be adjusted in a wide range by adjusting the thickness of the macroscopic graphene film and the shape, size and orientation of the slender through hole, and the apparent Poisson ratio can be close to a theoretical limit value of-1 at the minimum; the negative Poisson's ratio structure based on the macroscopic graphene film is applied to the flexible piezoelectric energy collector, so that the electrical output performance of the device can be remarkably improved.
Drawings
Fig. 1 is a design diagram of a negative poisson's ratio structure for laser engraving based on a macroscopic graphene film in example 1 of the present invention;
FIG. 2 is a cross-sectional microtopography of a macroscopic graphene film according to example 2 of the present invention;
fig. 3 is a physical photograph of a macroscopic graphene film according to example 2 of the present invention;
fig. 4 is a partial schematic view of a poisson ratio structure based on a macroscopic graphene membrane in example 3 of the present invention;
FIG. 5 shows the variation of the apparent Young's modulus of the negative Poisson ratio structure of the macroscopic graphene film according to the length of the rectangular hole in the round angle in the embodiment 3 of the present invention;
FIG. 6 shows the variation of the apparent Poisson's ratio of the negative Poisson's ratio structure with the length of the rectangular hole in the round angle in the case of macroscopic graphene film in example 3;
FIG. 7 is a schematic structural view of a piezoelectric energy harvester according to example 4 of the present invention;
FIG. 8 is a graph showing the variation of the open-circuit voltage effective value of the piezoelectric energy collector with the external load according to embodiment 4 of the present invention;
FIG. 9 shows the variation of the short-circuit current effective value of the piezoelectric energy collector with the external load according to embodiment 4 of the present invention;
FIG. 10 shows the variation of output power of the piezoelectric energy harvester with external load according to embodiment 4 of the present invention;
in the drawings, the reference numerals designate the following parts:
1. a macroscopic graphene film; 2. an elongated through hole; 21. a horizontal through hole; 22. a vertical through hole; 3. piezoelectric film
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The flexible piezoelectric energy collector based on the macroscopic graphene film negative Poisson's ratio structure comprises a macroscopic graphene film and a flexible piezoelectric material 3, wherein a plurality of long and thin through holes 2 are uniformly formed in the macroscopic graphene film, and the macroscopic graphene film and the flexible piezoelectric material 3 are stacked in a staggered mode.
In one embodiment, the aspect ratio of the elongated through hole 2 is not less than 2, the elongated through hole 2 includes horizontal through holes 21 and vertical through holes 22, the horizontal through holes 21 are arranged in a plurality of rows, the horizontal through holes 21 in the same row are located on the same straight line, a first gap is left between adjacent through holes, the vertical through holes 22 are arranged in a plurality of columns, the vertical through holes 22 in the same column are located on the same straight line, a second gap is left between adjacent through holes, the vertical through holes 22 are located in the first gap, and the horizontal through holes 21 are located in the second gap.
In one embodiment, the midpoint of the vertical through hole 22 is located in the first gap, and the midpoint of the horizontal through hole 21 is located in the second gap.
In one embodiment, the distances between two adjacent rows of horizontal through holes 21 are equal, and the distances between two adjacent columns of vertical through holes 22 are equal.
In one embodiment, the shape of the elongated through-hole 2 is oval, rectangular with rounded corners or diamond.
In one embodiment, all of the first gaps are equal and all of the second gaps are equal.
In one embodiment, the piezoelectric material is any one or more of an inorganic piezoelectric material based on lead zirconate titanate or barium titanate, a polymer piezoelectric material based on polyvinylidene fluoride and copolymers thereof, and a piezoelectric composite material.
As an embodiment, the macroscopic graphene film has a thickness of 10-50 μm, a Young's modulus of 0.1-20GPa and an electric conductivity of 104-106S/m。
Example 1:
the negative Poisson ratio structure based on the macroscopic graphene film can be prepared according to the following steps:
step 1: and (3) cutting the macroscopic graphene film into a rectangle with the size not less than 74mm multiplied by 58 mm.
Step 2: and drawing a negative Poisson ratio structure drawing by adopting CAD software, wherein the through hole on the negative Poisson ratio structure is elliptical, the major axis is 3.2mm, the minor axis is 0.16mm, and the minimum period size of the negative Poisson ratio structure is 4.0 mm.
And step 3: and (3) importing the drawing into a control system of a laser engraving machine, engraving a required hole structure outline on the macroscopic graphene film through the laser engraving machine, and removing redundant graphene films in holes to obtain the negative Poisson's ratio structure based on the macroscopic graphene film.
As shown in fig. 1, the negative poisson ratio structure design diagram based on the macroscopic graphene membrane is processed by adopting a laser engraving method, the design is convenient and quick, the precision is high, and the obtained poisson ratio structure keeps the good conductivity and mechanical flexibility of the original macroscopic graphene membrane and has a negative apparent poisson ratio.
Example 2:
based on the negative Poisson ratio structure of the macroscopic graphene film, the macroscopic graphene film can be prepared by the following method:
step 1: dispersing graphene oxide by using ultrapure water, uniformly coating the obtained dispersion liquid on a PET (polyethylene terephthalate) film, and drying to form a graphene oxide film;
step 2: carrying out reduction treatment on the graphene oxide film obtained in the step 1 under the conditions of inert atmosphere protection and high temperature of 2000-3000 ℃;
and step 3: and rolling and compacting the high-temperature reduction product to obtain the macroscopic graphene membrane.
The macroscopic graphene film obtained by the steps has the thickness of about 30 mu m, the Young modulus of 1.46GPa, the Poisson ratio of-0.19 and the conductivity of about 105And S/m, wherein the size, thickness, mechanics and electrical properties of the obtained macroscopic graphene film can be adjusted by changing the process parameters.
As shown in fig. 2, which is a cross-sectional microscopic morphology of the macroscopic graphene film, it can be seen that the obtained macroscopic graphene film is formed by stacking sheets.
As shown in fig. 3, which is a photograph of a macroscopic graphene film, it can be seen that the obtained macroscopic graphene film has good flexibility and can be easily bent.
The negative Poisson ratio macroscopic graphene film obtained according to the steps can be used for the negative Poisson ratio structure based on the macroscopic graphene film, and can also be used for assembling a piezoelectric energy collector.
Example 3:
the flexible piezoelectric energy collector based on the macroscopic graphene film negative Poisson ratio structure is designed by adopting the following structure:
step 1: the thickness of the macroscopic graphene film is 20 mu m, the Young modulus is 1.70GPa, and the Poisson ratio is-0.05;
step 2: the hole is in the shape of a rounded rectangle, the length is 4.0mm, the width is 0.2mm, and the radius of a rounded corner is 0.1 mm;
and step 3: the distribution of the holes is according to a certain periodicity, and the minimum period size of the structure is 5.0 mm.
As shown in FIG. 4, which is a partial schematic diagram of a negative Poisson's ratio structure based on a macroscopic graphene film, finite element calculation shows that the apparent Young modulus is 0.041GPa, and the Poisson's ratio is-0.90.
As shown in fig. 5 and fig. 6, the apparent young's modulus and the poisson ratio of the negative poisson ratio structure respectively vary with the length of the circular-angle rectangular hole, and it can be seen that as the hole length increases, the apparent young's modulus and the poisson ratio both significantly decrease, the variation range of the young's modulus spans two orders of magnitude, and the poisson ratio can be minimally close to the theoretical limit value of-1, which indicates that the apparent mechanical property of the negative poisson ratio structure of the macroscopic graphene film can be adjusted by adjusting the geometric parameters of the elongated through hole.
Example 4:
the piezoelectric energy collector based on the macroscopic graphene film negative Poisson ratio structure can be manufactured by the following method:
step 1: taking a piece of polyvinylidene fluoride piezoelectric film with the thickness of 10 mu m and subjected to full polarization treatment, wherein the size of the polyvinylidene fluoride piezoelectric film is not less than 25mm multiplied by 15 mm;
step 2: taking two negative Poisson ratio structures based on the macroscopic graphene film, wherein the long axis of an elliptical hole of each negative Poisson ratio structure is 3.0mm, the short axis of the elliptical hole of each negative Poisson ratio structure is 0.2mm, the minimum period size of each negative Poisson ratio structure is 5.0mm, the thickness of each negative Poisson ratio structure is 40 mu m, the in-plane size of each negative Poisson ratio structure is not less than 25mm multiplied by 15mm, the Young modulus of the macroscopic graphene film is 1.60 GPa;
and step 3: respectively and uniformly coating a thin layer of conductive silver adhesive on the upper surface and the lower surface of the polyvinylidene fluoride piezoelectric membrane obtained by cutting in the step (1), respectively sticking two negative Poisson's ratio structures based on the macroscopic graphene membrane obtained by cutting in the step (2) to the upper surface and the lower surface of the PVDF piezoelectric membrane, and standing at room temperature to solidify the conductive silver adhesive;
and 4, step 4: and (3) cutting the three-layer laminated structure into 25mm multiplied by 15mm, and finally leading out a lead from the upper and lower layers of macroscopic graphene films to obtain the piezoelectric energy collector.
As shown in fig. 7, which is a schematic structural diagram of the piezoelectric energy collector, the operation mode of the piezoelectric energy collector obtained according to the above steps is that the device is repeatedly stretched and deformed in the length direction, and the finite element calculation result shows that the device has an average longitudinal strain amplitude of 0.5%, an effective value of open circuit voltage under the action of sinusoidal periodic stretching with a frequency of 1.0Hz of 23.01V, an effective value of short circuit current of 368.3nA, and the output power reaches the maximum value of 4.24 μ W when an external load is about 251M Ω.
Comparing the electrical output performance of the piezoelectric energy collector with a piezoelectric energy collector with the same design but without using a negative poisson's ratio structure based on macroscopic graphene under the same working conditions, as shown in fig. 8, 9 and 10, the finite element calculation results of the load characteristics of the open-circuit voltage effective value, the short-circuit current effective value and the output power of the piezoelectric energy collector are shown, it can be seen that the piezoelectric energy collector using the negative poisson's ratio structure based on the macroscopic graphene film can give larger open-circuit voltage, short-circuit current and output power, wherein the open-circuit voltage is increased by about 23.3%, the short-circuit current is increased by about 23.1%, and the output power is increased by about 51.8%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The flexible piezoelectric energy collector based on the macroscopic graphene film negative Poisson ratio structure is characterized by comprising a macroscopic graphene film and a flexible piezoelectric material (3), wherein a plurality of long and thin through holes (2) are uniformly formed in the macroscopic graphene film, and the macroscopic graphene film and the flexible piezoelectric material (3) are arranged in a staggered and stacked mode.
2. The flexible piezoelectric energy collector based on the macroscopic graphene film negative Poisson's ratio structure according to claim 1, wherein the aspect ratio of the elongated through holes (2) is not less than 2, the elongated through holes (2) comprise horizontal through holes (21) and vertical through holes (22), the horizontal through holes (21) are arranged in several rows, the horizontal through holes (21) in the same row are located on the same straight line, a first gap is left between adjacent through holes, the vertical through holes (22) are arranged in several columns, the vertical through holes (22) in the same column are located on the same straight line, a second gap is left between adjacent through holes, the vertical through holes (22) are located in the first gap, and the horizontal through holes (21) are located in the second gap.
3. The flexible piezoelectric energy harvester based on a macroscopic graphene film negative poisson's ratio structure according to claim 1, characterized in that the midpoint of the vertical through hole (22) is located within a first gap and the midpoint of the horizontal through hole (21) is located within a second gap.
4. The flexible piezoelectric energy collector based on the macroscopic graphene film negative Poisson's ratio structure according to claim 1, wherein the distance between two adjacent rows of horizontal through holes (21) is equal, and the distance between two adjacent columns of vertical through holes (22) is equal.
5. The flexible piezoelectric energy collector based on a macroscopic graphene film negative Poisson's ratio structure according to claim 3, wherein the shape of the elongated through hole (2) is oval, rounded rectangle or diamond.
6. The flexible piezoelectric energy harvester based on a macroscopic graphene film negative poisson's ratio structure according to claim 1, wherein all of the first gaps are equal and all of the second gaps are equal.
7. The flexible piezoelectric energy harvester based on a macroscopic graphene film negative poisson's ratio structure according to claim 1, wherein the piezoelectric material is any one or more of an inorganic piezoelectric material based on lead zirconate titanate or barium titanate, a polymeric piezoelectric material based on polyvinylidene fluoride and copolymers thereof, and a piezoelectric composite material.
8. The flexible piezoelectric energy collector based on the macroscopic graphene film negative Poisson's ratio structure according to any one of claims 1 to 7, wherein the macroscopic graphene film has a thickness of 10 to 50 μm, a Young's modulus of 0.1 to 20GPa, and an electric conductivity of 104-106S/m。
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| CN113630040A (en) * | 2021-08-11 | 2021-11-09 | 武汉理工大学 | Flexible piezoelectric energy collection system based on graphene assembly film |
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| CN105555657A (en) * | 2013-03-15 | 2016-05-04 | 哈佛大学校长及研究员协会 | Void structures with repeating elongated-aperture pattern |
| EP3549262A1 (en) * | 2016-12-05 | 2019-10-09 | Sateco AG | Button assemblies |
| CN111682796A (en) * | 2020-05-20 | 2020-09-18 | 武汉汉烯科技有限公司 | Flexible piezoelectric energy collector based on negative Poisson ratio macroscopic graphene film |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105555657A (en) * | 2013-03-15 | 2016-05-04 | 哈佛大学校长及研究员协会 | Void structures with repeating elongated-aperture pattern |
| EP3549262A1 (en) * | 2016-12-05 | 2019-10-09 | Sateco AG | Button assemblies |
| CN111682796A (en) * | 2020-05-20 | 2020-09-18 | 武汉汉烯科技有限公司 | Flexible piezoelectric energy collector based on negative Poisson ratio macroscopic graphene film |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113630040A (en) * | 2021-08-11 | 2021-11-09 | 武汉理工大学 | Flexible piezoelectric energy collection system based on graphene assembly film |
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