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Preparation method of organic ferroelectric film with high polarization intensity

A technology of polarization strength and thin film preparation, applied in the field of organic ferroelectric polymer materials, can solve the problems of no improvement in electrical properties, and achieve the effects of easy process control, excellent electrical properties, and simple preparation process

Active Publication Date: 2016-10-12
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on the modification of PVDF-TrFE includes nano-confinement method, polar solvent method, template method, epitaxial growth and other methods, but although these methods can control the orientation of the structure to a certain extent, their electrical properties have not improved. a lot of

Method used

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  • Preparation method of organic ferroelectric film with high polarization intensity
  • Preparation method of organic ferroelectric film with high polarization intensity
  • Preparation method of organic ferroelectric film with high polarization intensity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) The ITO substrate was ultrasonically cleaned in deionized water, acetone, and absolute ethanol in sequence, and then dried by infrared lamps;

[0023] 2) Dissolve 1 g of PVDF-TrFE in 20 mL of tetrahydrofuran to obtain a tetrahydrofuran solution of PVDF-TrFE;

[0024] 3) Add 0.002g of PbTiO 3 nanosheets placed in the solution obtained in step 2), PbTiO 3 The mass / volume ratio of the tetrahydrofuran solution of nanosheets and PVDF-TrFE is 0.2%, and stirred to obtain a suspension;

[0025] 4) Ultrasonic treatment of the suspension obtained in step 3) to make PbTiO 3 The nanosheets were uniformly dispersed in PVDF-TrFE solution in tetrahydrofuran, and after standing for 20 min, it was spin-coated (1500 rpm, 30 s) onto a clean ITO substrate to obtain a thin film;

[0026] 5) The film obtained in step 4) was vacuum-dried and heat-treated at 180° C. for 1 hour.

[0027] The thickness of the organic ferroelectric film prepared in this example is 0.8 μm, and its grazing i...

Embodiment 2

[0029] The specific process steps are the same as in Example 1, the difference is that the PbTiO taken in step 3) 3 Nanosheets are 0.005g , PbTiO 3 The mass / volume ratio of nanosheets to PVDF-TrFE in tetrahydrofuran solution was 0.5%, the resting time in step 4) was 40 min, and the heat treatment time in step 5) was 0.5 h. The remanent polarization of the organic ferroelectric thin film prepared in this example is 10μC / cm 2 .

Embodiment 3

[0031] The specific process steps are the same as in Example 1, the difference is that the Si substrate is used, and the PbTiO taken in step 3) is 3 Nanosheets are 0.0527g , PbTiO 3 The mass / volume ratio of nanosheets and PVDF-TrFE in tetrahydrofuran solution is 5.0%, step 4) standing time is 30 min, and step 5) heat treatment time is 2 hours, the remanent polarization of the organic ferroelectric thin film prepared in this example 8μC / cm 2 .

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Abstract

The invention discloses a preparation method of an organic ferroelectric film with high polarization intensity. PbTiO3 nanosheets and PVDF-TrFE (polyvinylidene fluoride-trifluoroethylene) are taken as main raw materials, firstly, PVDF-TrFE is dissolved in tetrahydrofuran, a proper quantity of PbTiO3 nanosheets are added, and a turbid liquid is obtained; the PbTiO3 nanosheets are uniformly dispersed in a solution through ultrasonic treatment, a clean substrate is spin-coated with the solution uniformly with a spin-coating method, and a film is formed and subjected to heat treatment at the temperature of 180 DEG C. The preparation technology is simple, the process is easy to control, the prepared organic ferroelectric film has an oriented micro-nano structure and also has excellent electrical properties, and the residual polarization is up to 12.4 mu C / cm<2>.

Description

technical field [0001] The invention relates to a method for preparing an organic ferroelectric thin film, belonging to the field of organic ferroelectric polymer materials. Background technique [0002] Traditional ceramic materials have very high ferroelectric remanent polarization, but the preparation process is complex, brittle and ferroelectric loss is large. Organic polymers are flexible, have low ferroelectric losses, and are easy to process. PVDF-TrFE (polyvinylidene fluoride-trifluoroethylene), as a class of organic ferroelectrics, can be widely used in energy harvesters, pyroelectric infrared detectors and non-volatile memories, etc., with excellent electrical properties and wide applications prospect. Compared with traditional inorganic perovskite phase ferroelectric materials, the remnant polarization of PVDF-TrFE is lower (6 μC / cm 2 left and right), which limits its application in electronic device materials. Therefore, PVDF-TrFE can be modified by different ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L27/16C08K3/24
CPCC08J5/18C08J2327/16C08K3/24C08K2201/011C08L2203/16C08L27/16
Inventor 任召辉刘金李诗韩高荣
Owner ZHEJIANG UNIV
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