Bismuth ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film and preparation method thereof

A polyvinylidene fluoride and trifluoroethylene technology, applied in semiconductor/solid-state device manufacturing, coating, electric solid-state devices, etc., can solve the problems of high remanent polarization, high coercive field, large leakage current, etc. Achieve the effect of solving large leakage current, simple preparation method and easy operation

Active Publication Date: 2020-09-15
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PVDF-TrFE has high elasticity and excellent piezoelectric ferroelectric properties, and has broad application prospects in elastic organic electronic devices, such as organic solar cells, lithium-ion batteries, non-volatile memories, and piezoelectric sensors; however, organic iron The disadvantage of electrical materials is that the coercive field is relatively high, generally about 10 times that of ceramic materials, which will prevent it from obtaining high remanent polarization at low fields
Experiments have found that the composite membrane of pure BFO and PVDF-TrFE still has the disadvantage of large leakage current.

Method used

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  • Bismuth ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film and preparation method thereof
  • Bismuth ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film and preparation method thereof
  • Bismuth ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment provides a method for preparing a bismuth ferrite / polyvinylidene fluoride-trifluoroethylene composite film, comprising the following steps:

[0042] S1, preparing nanoscale BFO nanoscale powder;

[0043] S1.1. Dissolve bismuth nitrate pentahydrate and ferric nitrate nonahydrate in ethylene glycol methyl ether solvent at a molar ratio of 1.05:1 to obtain solution C with a concentration of 0.5 mol / L; Dissolve citric acid and polyethylene glycol in the continuously stirring solution C, the molar ratio of citric acid monohydrate to metal cations in the solution is 1:1, the mass ratio of polyethylene glycol to citric acid monohydrate is 1:8, and Bismuth ferrite precursor solution;

[0044] S1.2. The obtained bismuth ferrite precursor solution was continuously stirred in a 50°C water bath for 30 minutes to obtain a stable bismuth ferrite sol, and then dried in a drying oven at 80°C for 48 hours to obtain a bismuth ferrite xerogel;

[0045] S1.3. Place the obta...

Embodiment 2

[0057] This embodiment provides a bismuth ferrite / polyvinylidene fluoride-trifluoroethylene multilayer composite film comprising two layers of BFO / PVDF-TrFE composite film and PVDF-TrFE film, and the two layers of BFO / PVDF-TrFE composite film are stacked in sequence combined and located on the uppermost BFO / PVDF-TrFE composite film with a PVDF-TrFE film attached.

[0058] The preparation method of the above-mentioned bismuth ferrite / polyvinylidene fluoride-trifluoroethylene multilayer composite film comprises the following steps:

[0059] S1, preparing nanoscale BFO nanoscale powder;

[0060] S1.1. Dissolve bismuth nitrate pentahydrate and ferric nitrate nonahydrate in ethylene glycol methyl ether solvent at a molar ratio of 1.05:1 to obtain solution C with a concentration of 0.5 mol / L; Dissolve citric acid and polyethylene glycol in the continuously stirring solution C, the molar ratio of citric acid monohydrate to metal cations in the solution is 1:1, the mass ratio of poly...

Embodiment 3

[0075] This embodiment provides a method for preparing bismuth ferrite / polyvinylidene fluoride-trifluoroethylene composite film, comprising the following steps:

[0076] S1, preparing nanoscale BFO nanoscale powder;

[0077] S1.1. Dissolve bismuth nitrate pentahydrate and ferric nitrate nonahydrate in ethylene glycol methyl ether solvent at a molar ratio of 1.05:1 to obtain solution C with a concentration of 0.5 mol / L; Citric acid and polyethylene glycol were dissolved in solution C that was continuously stirred, the molar ratio of citric acid monohydrate to metal cations in the solution was 1:1, and the mass ratio of polyethylene glycol to citric acid monohydrate was 1:8, and Bismuth ferrite precursor solution;

[0078] S1.2. The obtained bismuth ferrite precursor solution was continuously stirred in a 50°C water bath for 30 minutes to obtain a stable bismuth ferrite sol, and then dried in a drying oven at 80°C for 48 hours to obtain a bismuth ferrite xerogel;

[0079] S1.3...

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Abstract

The invention belongs to the technical field of multiferroic films, and concretely relates to a bismuth ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film. The multilayer composite film comprises a PVDF-TrFE thin film and at least one layer of BFO/PVDF-TrFE composite film, and the PVDF-TrFE film is attached to the uppermost BFO/PVDF-TrFE composite film. A preparation method of the multilayer composite film comprises the following steps: dissolving PVDF-TrFE powder to obtain a solution A, and adding BFO nanoscale powder into the solution A to obtain a mixed solution B;taking FTO conductive glass as a substrate, spin-coating the FTO conductive glass with the mixed solution B to prepare a BFO/PVDF-TrFE composite film, drying, and spin-coating the BFO/PVDF-TrFE composite film with the solution A to prepare a PVDF-TrFE film; and then annealing the wet film to obtain a cobalt ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film, and finally plating a platinum point electrode on the cobalt ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film. The bismuth ferrite/polyvinylidene fluoride-trifluoroethylene multilayer composite film disclosed by the invention not only has low leakage current, but also has relatively high remnant polarization intensity, and is low in process equipment cost, simple in process and high in controllability.

Description

technical field [0001] The invention relates to a multiferroic composite film and a preparation method thereof, in particular to a bismuth ferrite / polyvinylidene fluoride-trifluoroethylene multilayer composite film and a preparation method thereof, belonging to the technical field of multiferroic films. Background technique [0002] In recent years, multiferroic composites formed of ceramics and polymers have attracted extensive attention and research due to their great application potential in multiferroic devices, such as sensors, actuators, and energy harvesters. Combination of polymers and ceramic particles can use traditional technology to prepare body materials and thin films, which has good process stability and is easy to implement. For example, the composite of traditional lead zirconate titanate, lead titanate or ferromagnetic materials such as cobalt ferrite and copolymer PVDF-TrFE can easily realize the dispersion of ceramic powder in the copolymer to form variou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J7/04C08L27/16C08K3/24H01L51/05H01L51/10H01L51/30
CPCC08J5/18C08J7/0427C08J7/042C08J2327/16C08J2427/16C08K3/24H10K85/00H10K10/00H10K10/80
Inventor 徐玲芳桂迟张雨肖海波王瑞龙杨昌平
Owner HUBEI UNIV
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