Double-layer structure flexible piezoelectric film with high output and method for its preparation and application

A double-layer structure, flexible piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, material selection for piezoelectric devices or electrostrictive devices, circuits, etc. The problems of high modulus of inorganic nanofillers and increase of modulus of composite materials can achieve the effect of maintaining flexibility, improving dielectric constant, and enhancing piezoelectric output.

Active Publication Date: 2020-04-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The second is that the modulus of the inorganic nanofiller itself is high, and the modulus of the composite material increases and the flexibility decreases after filling.

Method used

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  • Double-layer structure flexible piezoelectric film with high output and method for its preparation and application
  • Double-layer structure flexible piezoelectric film with high output and method for its preparation and application
  • Double-layer structure flexible piezoelectric film with high output and method for its preparation and application

Examples

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Effect test

Embodiment 1

[0029] Weigh 0.5618g of surface-modified BT nanoparticles in a beaker, add 7.5mL of nitrogen-nitrogen dimethylformamide (DMF), ultrasonically disperse for 2h to form a uniform suspension, then add 1.5g of PVDF powder thereto, Stir magnetically at 30°C for 12 hours to dissolve completely. Spin coating - heat treatment process as attached figure 1 Shown: Put the mixed solution in a vacuum drying oven to pump air bubbles, turn on the homogenizer, put on the cleaned and ultrasonically treated glass slide in ethanol, then use a straw to absorb 2mL of the mixed solution, drop it on the glass slide, and perform a single Layer thin film spin coating. Spin coating at 500rpm for 10s, and then at 1000rpm for 15s. The slow speed is for the solution to be spread evenly on the glass sheet, and the fast speed is for ensuring uniform film thickness. Put the single-layer film on the rubber drying table, bake at 150°C for 2 hours (to ensure that the solvent is dried), and cool down to 40°C (t...

Embodiment 2

[0031] Weigh 0.8923g of surface-modified BT nanoparticles into a beaker, add 7.5mL of DMF, ultrasonically disperse for 2h to form a uniform suspension, then add 1.5g of PVDF powder to it, and stir magnetically at 30°C for 12h to make it completely dissolve. Put the mixed solution in a vacuum drying oven to pump air bubbles, turn on the homogenizer, put the cleaned and ultrasonically treated glass slide in ethanol, then use a straw to absorb 2mL of the mixed solution, drop it on the glass slide, and spin the single-layer film. painted. Spin coating at 600rpm for 10s, then spin coating at 1200rpm for 10s, place the single-layer film on the rubber drying table, bake at 160°C for 2h, cool down to 40°C, and apply the second layer of the single-layer film on the glass sheet Pure PVDF is spin-coated under the same spin-coating conditions, and the solvent is completely dried at 70°C for 10 hours. The double-layer film is removed from the glass substrate to obtain the BT / PVDF-PVDF do...

Embodiment 3

[0033] Weigh 1.2640g of surface-modified BT nanoparticles in a beaker, add 7.5mL of nitrogen nitrogen dimethylformamide (DMF), ultrasonically disperse for 2h to form a uniform suspension, then add 1.5g of PVDF powder thereto, Stir magnetically at 30°C for 12 hours to dissolve completely. Put the mixed solution in a vacuum drying oven to pump air bubbles, turn on the homogenizer, put the cleaned and ultrasonically treated glass slide in ethanol, then use a straw to absorb 2mL of the mixed solution, drop it on the glass slide, and spin the single-layer film. painted. Spin-coat at 600rpm for 10s, then spin-coat at 1500rpm for 10s, place the single-layer film on the rubber drying table, bake at 150°C for 2 hours, cool down to 40°C, and apply the second layer of the single-layer film on the glass sheet Pure PVDF is spin-coated under the same spin-coating conditions, and the solvent is completely dried at 70°C for 10 hours. The double-layer film is taken off from the glass substra...

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Abstract

A double-layer structure flexible piezoelectric film with high output and its preparation and application method belong to the field of electronic composite materials and nano functional materials. The solution layer-by-layer spin coating-heat treatment process is adopted, and inorganic piezoelectric materials are used as fillers to improve the piezoelectric output of the composite film, and the double-layer structure is used to obtain higher output and better mechanical properties at the same time. The inorganic fillers are nanoparticles or nanofibers of piezoelectric ceramics such as barium titanate, barium strontium titanate, and lead zirconate titanate, or metal oxide nanoparticles or nanofibers such as magnesium oxide and zinc oxide, or multi-walled carbon nanometers. Tube. The polymer matrix can be materials such as polyvinylidene fluoride, polyvinylidene fluoride-trifluoroethylene, polyvinylidene fluoride-trifluoroethylene-hexafluoropropylene and the like. The efficiency of the filler can be improved by adjusting the filler content and its distribution in the bilayer. The composite material has the characteristics of good flexibility, high piezoelectric output, high sensitivity, and light weight. It can be used as a power source for wearable devices, and as a flexible sensor to detect human activities.

Description

technical field [0001] The invention belongs to the technical field of electronic composite materials and nano-functional materials, and relates to a double-layer structure polymer-based composite film using nano-piezoelectric ceramics, metal oxides, multi-wall carbon nanotubes and other inorganic materials as fillers by using a solution spin-coating process and its preparation method. The composite material has the characteristics of good mechanical properties, high piezoelectric output, high sensitivity and light weight. Background technique [0002] Piezoelectric materials refer to crystalline materials that generate voltage at both ends when subjected to an external force, and can realize mutual conversion between mechanical energy and electrical energy. Utilizing the characteristics of piezoelectric materials, it can be used to make various sensor elements and micro-nano energy devices. [0003] Barium titanate (BT) and lead zirconate titanate (PZT) are typical piezoe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08K9/00C08K3/24C08J5/18H01L41/113H01L41/18H01L41/187H01L41/193H01L41/317
CPCC08J5/18C08J2327/16C08K3/24C08K9/00H10N30/308H10N30/8536H10N30/302H10N30/8554H10N30/857H10N30/077
Inventor 胡澎浩牛津闫丽丽赵朝贤
Owner UNIV OF SCI & TECH BEIJING
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