Flexible transparent piezoelectric composite film, transparent stretchable ultrasonic transducer and preparation method thereof

A piezoelectric film, transparent polymer technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, etc. Solve the problems of insufficient polarization, low-voltage electrical properties, and non-transparency of composite piezoelectric films

Active Publication Date: 2021-12-17
ZHEJIANG LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the technical problems of non-transparent and low-voltage electrical properties caused by insufficient polarization of existing composite piezoelectric films

Method used

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  • Flexible transparent piezoelectric composite film, transparent stretchable ultrasonic transducer and preparation method thereof
  • Flexible transparent piezoelectric composite film, transparent stretchable ultrasonic transducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing a flexible transparent composite piezoelectric film provided in this embodiment includes:

[0041] 1) with AgNO 3 As the solute, with ethanol as the solvent, AgNO with a concentration range of 5mol / L was prepared. 3 solution;

[0042] 2) In the dark, mix PMN-PT piezoelectric single crystal particles with AgNO with a concentration of 5mol / L in the above step 3 The solution was mixed and stirred for 50 minutes to make the mixture uniform;

[0043] 3) irradiate the solution described in step 2) with ultraviolet light for 50 minutes, and keep stirring during the process;

[0044] 4) Then use a centrifuge to separate the prepared Ag@PMN-PT heterojunction from the solution described in step 3) above, wash it several times with deionized water, and dry it in a nitrogen atmosphere to finally prepare Ag@PMN -PT heterojunction particle powder, wherein the Ag content in the heterojunction is 10wt%;

[0045] 5) Weigh an appropriate amount of PVDF-TrFE, d...

Embodiment 2

[0052] A method for preparing a flexible transparent composite piezoelectric film provided in this embodiment includes:

[0053] 1) with AgNO 3 As the solute, with ethanol as the solvent, AgNO with a concentration range of 5mol / L was prepared. 3 solution;

[0054] 2) In the dark, mix PMN-PT piezoelectric single crystal particles with AgNO with a concentration of 5mol / L in the above step 3 The solution was mixed and stirred for 50 minutes to make the mixture uniform;

[0055] 3) irradiate the solution described in step 2) with ultraviolet light for 50 minutes, and keep stirring during the process;

[0056] 4) Then use a centrifuge to separate the prepared Ag@PMN-PT heterojunction from the solution described in step 3) above, wash it several times with deionized water, and dry it in a nitrogen atmosphere to finally prepare Ag@PMN -PT heterojunction particle powder, wherein the Ag content in the heterojunction is 10wt%;

[0057] 5) Weigh an appropriate amount of PVDF-TrFE, d...

Embodiment 3

[0064] A method for preparing a flexible transparent composite piezoelectric film provided in this embodiment includes:

[0065] 1) with AgNO 3 As the solute, using ethanol as the solvent, prepare a AgNO3 solution with a concentration range of 0.001mol / L;

[0066] 2) In the dark, mix PMN-PT piezoelectric single crystal particles with AgNO with a concentration of 0.001mol / L in the above step 3 The solution was mixed and stirred for 50 minutes to make the mixture uniform;

[0067] 3) irradiate the solution described in step 2) with ultraviolet light for 50 minutes, and keep stirring during the process;

[0068] 4) Then use a centrifuge to separate the prepared Ag@PMN-PT heterojunction from the solution described in step 3) above, wash it several times with deionized water, and dry it in a nitrogen atmosphere to finally prepare Ag@PMN -PT heterojunction particle powder, wherein the Ag content in the heterojunction is 0.5wt%;

[0069] 5) Weigh an appropriate amount of PVDF-TrF...

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Abstract

The invention discloses a flexible transparent piezoelectric composite film, a transparent stretchable ultrasonic transducer and a preparation method thereof. The flexible composite transparent film is mainly obtained by constructing a chemical heterojunction and designing the structure of each phase ferroelectric domain wall in the composite piezoelectric film. According to the method, firstly, a chemical heterojunction is formed in a composite film precursor solution through an in-situ synthesis method, the chemical heterojunction can improve voltage distribution of an inorganic piezoelectric phase dispersion unit in the composite film when the inorganic piezoelectric phase dispersion unit is polarized, and dipole moment orientation under the action of an electric field is remarkably improved; and then, applying an alternating electric field to the formed non-transparent flexible composite film for polarization, so continuous ferroelectric domains are fused with each other, and the number of the ferroelectric domains is reduced. And finally, the flexible composite piezoelectric film with high transparency, high piezoelectric property and low acoustic impedance is prepared and is finally applied to a transparent stretchable ultrasonic transducer, particularly applied to photoacoustic imaging of non-planar tissues such as craniocerebral tissues and the like, the light transmission efficiency in photoacoustic imaging is improved, and the imaging quality is improved.

Description

technical field [0001] The invention relates to the technical field of piezoelectric materials, in particular to a flexible transparent piezoelectric composite film, a transparent stretchable ultrasonic transducer and a preparation method thereof. Background technique [0002] In photoacoustic imaging, traditional high-performance piezoelectric ultrasonic transducers are mostly made of PZT piezoelectric ceramics or PMN-PT piezoelectric single crystals. Because PZT and PMN-PT have high piezoelectric coefficient and electromechanical coupling coefficient, but unfortunately they are not transparent in the range of visible light. Relatively speaking, piezoelectric materials with high transparency include lithium niobate single crystal, PVDF, etc., but their piezoelectric coefficient and electromechanical coupling coefficient are much lower than the above-mentioned PZT and PMN-PT, which will limit their manufacturing. into the bandwidth and sensitivity of the ultrasonic transduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K3/08C08K7/00C08K3/013C08J5/18H01L41/09H01L41/257H01L41/45
CPCC08J5/18C08J2327/16C08K2003/0806C08K7/00C08K2201/001C08K3/013C08K2201/011H10N30/2047H10N30/045H10N30/098
Inventor 任丹阳施钧辉尹永刚陈睿黾李驰野
Owner ZHEJIANG LAB
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