CN215299291U - PVDF piezoelectric film - Google Patents
PVDF piezoelectric film Download PDFInfo
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- CN215299291U CN215299291U CN202120522596.7U CN202120522596U CN215299291U CN 215299291 U CN215299291 U CN 215299291U CN 202120522596 U CN202120522596 U CN 202120522596U CN 215299291 U CN215299291 U CN 215299291U
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- 239000002033 PVDF binder Substances 0.000 title claims abstract description 51
- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims abstract description 51
- 239000004020 conductor Substances 0.000 claims abstract description 11
- 230000006698 induction Effects 0.000 claims abstract description 6
- 238000002834 transmittance Methods 0.000 abstract description 16
- 230000035945 sensitivity Effects 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 4
- 238000005452 bending Methods 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 19
- 239000010410 layer Substances 0.000 description 14
- 238000012360 testing method Methods 0.000 description 6
- 239000002042 Silver nanowire Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
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Abstract
The utility model relates to a piezoelectric material field specifically indicates a PVDF piezoelectric film. The PVDF piezoelectric film comprises a PVDF piezoelectric film layer, wherein the upper surface of the PVDF piezoelectric film layer is provided with a convex pressure induction microstructure, and the lower surface of the PVDF piezoelectric film layer is provided with a concave groove structure; and the concave groove structure is filled with a conductive material, and the conductive material is connected with the control module through a lead. The piezoelectric induction and the transparent electrode are integrated on one PVDF piezoelectric film, so that the cost is saved, and the adhesive strength and the flexibility are obviously improved during bending; the raised pressure sensing microstructure is pressed on the upper surface, so that the sensitivity of the piezoelectric layer is improved; the grooves are pressed on the lower surface and filled with the conductive material, so that the conductivity is improved, and the light transmittance of the piezoelectric film is kept to the maximum extent.
Description
Technical Field
The utility model relates to a piezoelectric material field specifically indicates a PVDF piezoelectric film.
Background
The PVDF piezoelectric film is a novel high-molecular piezoelectric sensor functional material, has the advantages of soft texture, light weight, high application sensitivity, wide frequency response range, strong flexibility, high sensitivity, strong impact resistance, small noise signal, small influence on the mechanical property of the structure, high mechanical strength, good impedance matching and the like, and is increasingly widely applied to the measurement aspects of force, acceleration, displacement, structural strain and the like along with the deepening of research.
When the existing PVDF piezoelectric film is applied, a double-layer film structure is adopted, an electrode layer and a piezoelectric induction layer respectively realize the functions of the PVDF piezoelectric film, the two PVDF piezoelectric films are combined together in a bonding mode, the bonding strength of the PVDF piezoelectric film can be changed when the PVDF piezoelectric film is bent, and the flexibility of the PVDF piezoelectric film is low. The combination of the two piezoelectric films also enables the light transmittance and the consistency to be lower, and the low light transmittance of the piezoelectric film can not meet the requirements of products in some application occasions with requirements on light transmittance.
Disclosure of Invention
An object of the utility model is to provide a PVDF piezoelectric film to reach reinforcing piezoelectric film's sensitivity and pliability, improve the purpose of luminousness, preparation precision and uniformity.
The utility model provides a PVDF piezoelectric film, including PVDF piezoelectric film layer, the upper surface of piezoelectric film layer has convex pressure-sensitive microstructure, the lower surface has concave groove structure; and the concave groove structure is filled with a conductive material, and the conductive material is connected with the control module through a lead.
Furthermore, the shape of the protruding pressure sensing microstructure is any one or a combination of two or more than two of a pyramid, a cone, a circular truncated cone, a hemisphere, a cylinder and a prism.
Furthermore, the arrangement mode of the convex pressure sensing microstructures on the upper surface of the PVDF piezoelectric film is any one of rectangle, triangle, hexagon, octagon and parallelogram.
Further, the conductive material filled in the concave groove structure is any one or a combination of two or more of nano silver particles, nano silver wires, nano gold particles, nano gold wires, nano copper particles, PH1000, graphene and carbon nanotubes.
Further, the cross-sectional shape of the concave groove structure is any one of a rectangle, a V-shape, a trapezoid, a semicircle, a pentagon and a hexagon.
Furthermore, the width of the notch of the concave groove structure is 500 nm-50 μm, and the ratio of the depth of the groove to the width of the notch is 0.1-10.
The PVDF piezoelectric film provided by the utility model realizes that the two functions of piezoelectric induction and transparent electrode are integrated on one PVDF piezoelectric film, thereby saving the cost and obviously improving the bonding strength and flexibility during bending; the raised pressure sensing microstructure is pressed on the upper surface, so that the sensitivity of the piezoelectric layer is improved; the grooves are pressed on the lower surface and filled with the conductive material, so that the conductivity is improved, and the light transmittance of the piezoelectric film is kept to the maximum extent.
Drawings
FIG. 1 is a diagram of a PVDF piezoelectric film.
Fig. 2 is a bottom view of a PVDF piezoelectric film.
FIG. 3 is a schematic diagram of the connection of a PVDF piezoelectric film multi-control module.
FIG. 4 is a schematic connection diagram of a PVDF piezoelectric film single control module.
Detailed Description
Example 1:
a PVDF piezoelectric film comprises a PVDF piezoelectric film layer 1, wherein the upper surface of the piezoelectric film layer is provided with a convex pressure induction microstructure 101, and the lower surface of the piezoelectric film layer is provided with a concave groove structure 102; the shape of the protruded pressure sensing microstructure 101 is triangular pyramid, and the protruded pressure sensing microstructure is arranged on the upper surface of the PVDF in a parallelogram array; the height of the triangle on the bottom surface of the pressure sensing microstructure 101 is 500nm, and the height of the triangular pyramid is 250 nm; the cross section of the concave groove structure 102 is rectangular, and the concave groove structures 102 are arranged in parallel on the lower surface; the width of the notch of the concave groove 102 is 500nm, the depth of the notch is 3 μm, the distance between the grooves is 100 μm, the conductive material 3 filled in the concave groove structure 102 is a nano silver wire, the filling width of the nano silver wire is 500nm, and the nano silver wire is connected with the control module 2 through a wire 201.
When the PVDF piezoelectric film 1 is touched by a hand, the pressure change is captured through the upper micro-structure array 101 of the PVDF piezoelectric film, the pressure change is converted into an electric signal, the electric signal is transmitted to the control module 2 through the nano silver wire, and after the control module 2 receives the signal, different feedback signals are given according to the strength through a series of calculations.
Further, on the basis of the embodiment 1, the utility model also carries out the embodiment 2-8; the method comprises the following specific steps:
example 2:
the width of the notch of the concave groove structure 102 is 1 μm, and the filling width of the nano silver line is 1 μm. The rest is the same as example 1.
Example 3
The width of the notch of the concave groove structure 102 is 10 μm, and the filling width of the nano silver line is 10 μm. The rest is the same as example 1.
Example 4
The width of the notch of the concave groove structure 102 is 25 μm, and the filling width of the nano silver wire is 25 μm. The rest is the same as example 1.
Example 5
The width of the notch of the concave groove structure 102 is 50 μm, and the filling width of the nano silver wire is 50 μm. The rest is the same as example 1.
Example 6:
a single layer PVDF piezoelectric film was used as a control without any treatment.
Example 7:
the nano silver wires in each concave groove structure 102 correspond to the individual control modules 3 one by one and are respectively connected, as shown in fig. 3, and the rest is the same as that of embodiment 1.
Example 8:
the nano silver wires in each concave groove structure 102 are connected to the same control module 3 through wires, as shown in fig. 4, and other embodiments are the same as embodiment 1.
Comparing example 7 with example 8, it can be seen that in example 7, when the PVDF piezoelectric film 1 is touched by hand, the change in pressure is captured by the PVDF piezoelectric film upper layer microstructure array 101, and is converted into an electrical signal, the electrical signal is transmitted to the corresponding control module 2 through the PVDF lower surface nano silver wire, and after receiving the signal, the control module 2 outputs address information of a pressure application part through calculation, and gives different feedback signals according to the force; in embodiment 8, all the silver nanowires are connected to the same control module 2, which can reduce the cost, and the electrical signal generated by touch is transmitted to the same control module 2 through the silver nanowires, and the control module 2 can capture the information transmitted by all the silver nanowires, so that the sensitivity is high, but the pressed part cannot be distinguished.
And (3) performance testing:
testing light transmittance and sheet resistance:
measuring points are selected on the PVDF piezoelectric films of the embodiments 1 to 5, and the light transmittance and the sheet resistance of the PVDF piezoelectric films under different filling widths of the nano silver wires are measured.
The method for measuring the light transmittance is based on a spectrophotometer method in GB/T2410-2008 determination standard of transparent plastic light transmittance and haze, and the square resistance is measured by using a Loresta-AX low-resistivity meter of MCP-T370 model. Specific values of transmittance and sheet resistance in examples 1-5 were determined as follows:
table 1 influence of the filling width of the silver nanowires on the transmittance and sheet resistance
The test results of comparative example 1 and example 6 show that the silver nanowires filled into the concave groove structure can improve the electrical conductivity of the film and reduce the light transmittance.
As a result of comparing example 1 with examples 2, 3, 4, and 5, it can be found that the transmittance gradually decreases with the increase of the filling width, and the sheet resistance gradually increases with the increase of the filling width. The light transmittance and the sheet resistance serve as a pair of contradictory indexes, and in the practical application process, the filling width can be selected according to actual needs, and the geometric distribution of the concave groove structure is optimized to obtain the proper light transmittance and sheet resistance.
And (3) testing the sensitivity:
measuring points are selected on the PVDF piezoelectric films of the embodiment 1 and the embodiment 6, and the influence of the piezoelectric sensing microstructure array with the bulges arranged on the upper surface on the sensitivity is measured.
According to the signal acquisition mode of the PVDF piezoelectric film, measuring points are selected on the piezoelectric film, and a quasi-static D33 measuring instrument with the model of ZJ-3AN is used for performing quasi-static test of a longitudinal piezoelectric strain constant D33 according to GB/T11309-1989 piezoceramic material performance test method.
The sensitivity value of example 1 was measured to be 18.6 (pC/N) and the sensitivity value of example 6 was measured to be 15.2 (pC/N). The result of comparative test can find that the sensitivity of PVDF piezoelectric film in example 1 is obviously higher than that of example 6.
The pressure sensing microstructure is arranged on the upper surface of the PVDF piezoelectric film, so that the pressure applied from the outside can be gathered at one point or a plurality of points, and the pressure is prevented from being distributed in a plane manner in the embodiment 6, so that the film can generate more sensitive pressure response, and the sensitivity of the piezoelectric sensing layer can be obviously improved by arranging the pressure sensing microstructure 101 on the upper surface of the PVDF piezoelectric film.
The PVDF piezoelectric film provided by the utility model integrates the functions of two layers of piezoelectric films into one layer, thereby saving the cost and improving the bonding strength and flexibility during bending; the raised pressure sensing microstructure is pressed on the upper surface, so that the sensitivity of the piezoelectric sensing layer is obviously improved; the grooves are pressed on the lower surface and filled with the conductive material, so that the conductivity is improved, and the light transmittance of the piezoelectric film is kept to the maximum extent.
Claims (5)
1. A PVDF piezoelectric film, comprising: the PVDF piezoelectric film comprises a PVDF piezoelectric film layer (1), wherein the upper surface of the piezoelectric film layer is provided with a convex pressure induction microstructure (101), and the lower surface of the piezoelectric film layer is provided with a concave groove structure (102); and the concave groove structure (102) is filled with a conductive material (3), and the conductive material (3) is connected with the control module (2) through a lead (201).
2. The PVDF piezoelectric film of claim 1, wherein: the shape of the protruding pressure sensing micro-structure (101) is any one or the combination of two or more than two of a pyramid, a cone, a round table, a hemisphere, a cylinder and a prism.
3. The PVDF piezoelectric film of claim 2, wherein: the arrangement mode of the convex pressure sensing microstructures (101) on the upper surface of the PVDF piezoelectric film is any one of rectangle, triangle, hexagon, octagon and parallelogram.
4. The PVDF piezoelectric film of claim 1, wherein: the cross-sectional shape of the concave groove structure (102) is any one of rectangle, V-shaped, trapezoid, semicircle, pentagon and hexagon.
5. The PVDF piezoelectric film of claim 1, wherein: the width of the notch of the concave groove structure (102) is 500 nm-50 μm, and the ratio of the depth of the groove to the width of the notch is 0.1-10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120522596.7U CN215299291U (en) | 2021-03-12 | 2021-03-12 | PVDF piezoelectric film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120522596.7U CN215299291U (en) | 2021-03-12 | 2021-03-12 | PVDF piezoelectric film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112885956A (en) * | 2021-03-12 | 2021-06-01 | 三三智能科技(日照)有限公司 | PVDF piezoelectric film and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112885956A (en) * | 2021-03-12 | 2021-06-01 | 三三智能科技(日照)有限公司 | PVDF piezoelectric film and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A PVDF Piezoelectric Film Effective date of registration: 20221227 Granted publication date: 20211224 Pledgee: Rizhao Donggang Rural Commercial Bank Co.,Ltd. Pledgor: Sansan Intelligent Technology (Rizhao) Co.,Ltd. Registration number: Y2022980029192 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |