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Preparation method of modified graphene oxide-piezoelectric polymer energy storage thin film device

A piezoelectric polymer and thin film device technology, applied in the field of piezoelectric polymer composite materials, can solve few problems such as material preparation and performance research, and achieve the effect of increasing dielectric constant, low loss and good dielectric properties

Active Publication Date: 2017-07-11
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The piezoelectric polymer is modified by adding fillers. Under the action of external force, the composite film can convert energy and store it at the same time. Few experts and scholars have studied the preparation and performance of such materials.

Method used

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  • Preparation method of modified graphene oxide-piezoelectric polymer energy storage thin film device
  • Preparation method of modified graphene oxide-piezoelectric polymer energy storage thin film device
  • Preparation method of modified graphene oxide-piezoelectric polymer energy storage thin film device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiments of the present invention will be further described below in conjunction with accompanying drawings:

[0024] First disperse perfluoroazidobenzoic acid and graphene oxide (5:1) in 10ml ethanol, ultrasonic for 40min, then heat at 60°C to make all the ethanol volatilize, then heat to 140°C at high temperature, and react for 40min, so that Perfluoroazidobenzoic acid fully covalently reacts with graphene oxide, and reduces graphene oxide to a certain extent, and then washes and centrifuges with ethanol for more than 3 times to remove excess perfluoroazidobenzoic acid modifier. The bottom precipitate was freeze-dried for 36h.

[0025] Add a certain amount of perfluoroazidobenzoic acid-modified graphene oxide (0.0612g) into N,N-dimethylformamide solvent (20ml), and ultrasonically disperse for 2-3h. Add 3g of polyvinylidene fluoride-hexafluoropropylene copolymer, heat to 80°C, stir for 2 hours, stand still for 30 minutes, and wait for the bubbles to escape.

[002...

Embodiment 2

[0028] Example 2 Dielectric constant and loss of performance test

[0029] Approach:

[0030] 1 Cut the modified graphene oxide / polyvinylidene fluoride-hexafluoropropylene composite films with different contents (0, 1, 1.5, 2, 2.1, 2.2, 2.3, 2.5, 3 wt%) into regular squares, and the test area And thickness, both sides are covered with silver paste, as the upper and lower electrodes.

[0031] 2 Under different input frequencies, the dielectric constant and loss of the composite material are tested.

[0032] analyze:

[0033] figure 2 is the dielectric properties of modified graphene oxide / polyvinylidene fluoride-hexafluoropropylene composite films (0, 1, 1.5, 2, 2.1, 2.2, 2.3, 2.5, 3 wt%) with different contents, by figure 2 It can be seen that as the content of modified graphene oxide increases, its dielectric constant also increases steadily, and the loss also remains low. When it increases to 2.5 wt%, at 100 Hz, the dielectric constant reaches 158, and the loss reache...

Embodiment 3

[0034] Example 3 Performance Test of Electricity Production and Storage Performance

[0035] Approach:

[0036] 1. Paste copper foil on the upper and lower sides of the prepared film, lead out wires from each, and connect them to the test instrument.

[0037] 2. The test film is fixed on the glove. As the finger moves, the film will deform accordingly. The electrical signal generated by this movement and the stored electrical signal are studied.

[0038] analyze:

[0039] from image 3 It can be seen from (a) that through finger movement, the film can generate electrical signals through energy conversion, and the current magnitude is 30-50nA. at the same time as image 3 As shown in (b), through finger movement, the external circuit is disconnected and the electric energy is stored in the film for a short time. When the external circuit is changed to open, the electric energy is released and an electric signal is generated. The current is 31.6nA, indicating that the film h...

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Abstract

The invention discloses a preparing method for a modified graphene oxide-piezoelectric polymer energy-storing thin-film device. According to the preparing method, at first, a thin-film material is prepared, perfluoro nitrine benzoic acid and graphene oxide are subjected to a covalent reaction through heating so that micro-molecular modifying agents can be connected to the surface of modified graphene oxide, then the modified graphene oxide is washed cleanly through ethyl alcohol, frozen, dried, and then dispersed in N, N-dimethylformamide in an ultrasonic mode, a certain quantity of polyvinylidene fluoride-hexafluoropropylene copolymers is added, the mixture is heated and stirred, a tape-casting method is used for preparing a composite thin film, after heating is carried out to remove solvent, the thin film is cooled and recrystallized, then the thin film and a substrate are soaked in water, and the thin film is taken down; finally, the prepared thin film is prepared into the device, two pieces of copper foil are connected to the upper face and the lower face of the thin film respectively to serve as current collectors, wires are led out of the copper foil, or the copper foil can be directly connected with a test instrument for testing, and namely the flexible thin-film device integrating an electricity generation ability and an electricity storage ability is prepared.

Description

technical field [0001] The invention belongs to the category of piezoelectric polymer composite materials, and provides a method for preparing piezoelectric polymer composite materials reinforced by modified graphene oxide. The method enables the composite material to convert mechanical energy into electrical energy and store electrical energy in situ performance in composite materials. Background technique [0002] Piezoelectric polymers are an important class of electronic device materials. They play an important role in modern society and are indispensable in military and civilian fields such as aerospace, energy storage, reconnaissance, underwater navigation, and biological imaging. Traditional ceramic-based piezoelectric materials have the characteristics of high density, high hardness, high brittleness, and difficult processing, which make it difficult to meet the requirements of the electronics industry for dielectric materials. Therefore, piezoelectric polymer-based...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L27/16C08K9/04C08K3/04
Inventor 张以河佟望舒安琪
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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