Graphene conductive elastomer and its preparation method and sensor

A graphene and elastomer technology, applied in the field of sensors, can solve the problems of poor induction of small deformation, limited detection range, low sensitivity, etc., and achieve the effect of increasing elasticity, improving detection range and good sensitivity

Active Publication Date: 2020-07-24
北京石墨烯技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a graphene conductive elastomer and its preparation method and sensor for the problems of poor sensing of small deformations, limited detection range and low sensitivity of traditional conductive elastomers.

Method used

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  • Graphene conductive elastomer and its preparation method and sensor
  • Graphene conductive elastomer and its preparation method and sensor
  • Graphene conductive elastomer and its preparation method and sensor

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preparation example Construction

[0048] The embodiment of the present invention also provides a preparation method of the graphene conductive elastomer of the above embodiment, comprising:

[0049] S100, providing an elastic matrix 100, the elastic matrix 100 has at least partially interconnected holes 102 therein;

[0050] S200, immersing the elastic matrix 100 in a mold equipped with a graphene aqueous dispersion for freeze molding to obtain a graphene frozen ice-like composite structure of the elastic matrix 100; and

[0051] S300, freeze-drying the graphene frozen ice-like composite structure of the elastic matrix 100 at -200°C to -40°C to form graphene gas condensation in the graphene frozen ice-like structure in the interconnected holes 102 Glue the 3D network structure.

[0052] In a specific embodiment, the preparation process of graphene conductive elastomer can refer to figure 2 shown.

[0053] In step S100, the preparation method of the elastic matrix 100 having a multi-interconnected structure...

Embodiment 1

[0072] (1) 10g of two-component polydimethylsiloxane, 0.3g of graphene, 5g of ethyl acetate, and 50g of sodium chloride were mixed and stirred evenly, and after centrifugal defoaming using a centrifuge, they were packed into a plastic mold and placed in a plastic mold. Curing at a constant temperature in an oven at 50° C. for 24 hours to obtain an elastic matrix preform 140 .

[0073] (2) Place the cured elastic matrix preform 140 in water, wash at 80° C. for 24 hours, and remove the sodium chloride particles in the elastic matrix preform 140 . Then place it in an organic solvent (ethanol) and wash at 30° C. for 1 hour to remove other impurities in the material. Dry the material after the organic solvent treatment overnight to obtain a spongy elastic matrix 100 with a spongy-like structure. For the microstructure, please refer to Figure 3A and Figure 3B shown.

[0074] (3) Add 0.2 g of graphene oxide and 0.4 g of ascorbic acid into 100 mL of water to form a graphene aqueo...

Embodiment 2

[0078] (1) Mix and stir 10g of silicone rubber, 0.3g of copper nanowires, 5g of polythiophene, and 70g of sodium chloride evenly, use a centrifuge to defoam, put it into a plastic mold, and cure at a constant temperature in an oven at 50°C for 24h An elastic matrix preform 140 is obtained.

[0079] (2) Place the cured elastic matrix preform 140 in water, wash at 80° C. for 24 hours, and remove the sodium chloride particles in the elastic matrix preform 140 . Then place it in an organic solvent (ethanol) and wash at 30° C. for 1 hour to remove other impurities in the material. The material treated with the organic solvent was dried overnight to obtain the elastic matrix 100 with a sponge-like structure.

[0080] (3) Add 1 g of graphene oxide and 1 g of hydrazine hydrate into 100 mL of water to form a graphene aqueous dispersion. The spongy elastic matrix 100 is immersed into the mold containing the graphene aqueous dispersion, so that the graphene aqueous dispersion is fully ...

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Abstract

The invention discloses a graphene conductive elastomer which comprises an elastic base body and graphene three-dimensional network structures. Holes are formed in the elastic base body, the communication rate between the holes is 30%-80%, the holes are filled with the graphene three-dimensional network structures, and at least part of graphene in the graphene three-dimensional network structuresis intrinsic graphene or reduced graphene oxide. The invention also discloses a preparation method of the graphene conductive elastomer. The invention also discloses a sensor.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a graphene conductive elastomer, a preparation method thereof and a sensor. Background technique [0002] Conductive elastomers are the core material units of flexible electronic sensors. Flexible electronic sensors have the characteristics of high sensitivity, fast response, wearability, and versatility, and are widely used in pressure sensors, electronic skin, wearable devices, and medical diagnosis. Graphene is a two-dimensional material composed of sp2 carbon atoms. It has excellent electrical conductivity, flexibility, mechanical properties and stability. These characteristics make graphene an ideal basic functional material for the preparation of flexible electronic sensors. [0003] At present, the main method of preparing graphene conductive elastomer is to form graphene into a sensing layer, and then directly superimpose the graphene sensing layer on the surface of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/22G01L9/04C01B32/182C01B32/194
CPCC01B32/182C01B32/194G01L1/22G01L9/04
Inventor 王佳伟李文博刘丹阳刘静李静李炯利王旭东
Owner 北京石墨烯技术研究院有限公司
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