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Composite piezoelectric film and preparation method and application thereof

A piezoelectric film, piezoelectric technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, material selection for piezoelectric devices or electrostrictive devices Etc., can solve problems such as poor impact resistance, and achieve high yield, good environmental benefits, and good thermal stability.

Pending Publication Date: 2020-04-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic piezoelectric materials such as ceramic powders also have good piezoelectric properties, but due to the hardness and brittleness of inorganic piezoelectric materials and poor impact resistance, they cannot be directly applied to flexible devices.

Method used

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  • Composite piezoelectric film and preparation method and application thereof
  • Composite piezoelectric film and preparation method and application thereof
  • Composite piezoelectric film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The present embodiment carries out the preparation of PVDF nanofiber membrane, comprises the following steps:

[0059] 1) Put the PVDF powder in a 50°C drying oven and bake it at a constant temperature for 3 hours; mix acetone and DMF solution, and then add PVDF powder to the DMF / acetone solvent under stirring at 40°C until a 16wt% transparent and homogeneous PVDF solution is obtained . Wherein, the volume ratio of DMF and acetone in the solvent is 3:7, 4:6, 5:5, 6:4 and 7:3 in sequence.

[0060] Pour the homogeneous PVDF solution into a 20mL syringe, and perform electrospinning on the electrospinning instrument, the DC voltage of the electrospinning is 15kV, the distance between the needle of the electrospinning and the collector is 10cm, The temperature is 25°C, the humidity of electrospinning is 30%, the flow rate of polymer solution for electrospinning is 1.0mL / h, and 20mm deep deionized water is placed or not placed in the receiving container, so that the electros...

Embodiment 2

[0063] This embodiment carries out the preparation of composite piezoelectric film, comprises the following steps:

[0064] 1) Pretreatment of inorganic piezoelectric powder

[0065] The barium titanate powder with a particle size of 500nm was immersed in 95wt% ethanol solution, stirred ultrasonically for 30min, and then dried at 300°C. Repeat the above steps 5 times to ensure the depolarization of the barium titanate powder (BT) and effectively remove the impurities in the barium titanate powder. The scanning electron microscope image of the obtained inorganic piezoelectric powder barium titanate is as follows Figure 4 shown.

[0066] 2) Configuration of precursor solution

[0067] Dissolve polyvinylidene fluoride (PVDF) powder in a mixed solvent of N,N-dimethylformamide (DMF) and acetone (the volume ratio of DMF / acetone is 6:4, and stir at a temperature of 60°C for 6h , and subjected to 30min ultrasonic treatment to obtain a 16wt% transparent and homogeneous PVDF solutio...

Embodiment 3

[0071] In this embodiment, a composite piezoelectric film is prepared, and the steps are the same as those in Embodiment 1, except that the mass of barium titanate powder is 1% of that of the PVDF solution.

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Abstract

The invention belongs to the technical field of piezoelectric materials, and particularly relates to a composite piezoelectric film and a preparation method and application thereof. The preparation method comprises the following steps: adding inorganic piezoelectric powder into a polymer solution to obtain a precursor solution; and carrying out electrostatic spinning on the precursor solution andperforming collection in a water medium to obtain the composite piezoelectric film. The composite piezoelectric film is a porous structure fiber film and is filled with inorganic piezoelectric powder,and a polymer piezoelectric material and a rigid piezoelectric material are well compounded. Moreover, the composite piezoelectric film is a beta-phase enhanced flexible composite film, can generatea relatively large output piezoelectric voltage, has a relatively high piezoelectric constant, is uniform in piezoelectric effect distribution, and can solve the problem that an existing polymer piezoelectric film cannot be effectively combined with an inorganic piezoelectric material to form a flexible device with high piezoelectric performance. In addition, the preparation method is simple in preparation process and beneficial to large-scale production.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric materials, in particular to a composite piezoelectric film and its preparation method and application. Background technique [0002] Piezoelectric effect means that "when a material is deformed by an external force in a certain direction, a polarization phenomenon will occur inside it, and at the same time, positive and negative charges will appear on its two opposite surfaces. When the external force is removed, it will It will return to the uncharged state” phenomenon. Piezoelectric materials with piezoelectric properties have broad application prospects in heart rate monitoring, acoustic sensors, and energy harvesting. Polymers such as polyvinylidene fluoride (PVDF) are semi-crystalline polymer piezoelectric materials with CH2-CF2 monomer repeating units, and contain five different crystal phases of α, β, γ, δ and ε. Among them, the β crystal phase in a single unit cell has the stronges...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/314H01L41/18H01L41/35H10N30/074H10N30/09H10N30/85
CPCH10N30/852H10N30/074H10N30/09
Inventor 鲁圣国林雄威普拉萨德姚英邦陶涛梁波
Owner GUANGDONG UNIV OF TECH
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