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High-elasticity graphene composite deformation sensing material and preparation and application method thereof

A technology for graphene composite and sensing materials, which is applied in the field of highly elastic graphene composite deformation sensing materials and their preparation, and achieves the effect of simple and efficient preparation methods

Inactive Publication Date: 2017-09-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And now there are few reports on conductive graphene / cellulose degradable airgel deformation sensing materials.

Method used

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  • High-elasticity graphene composite deformation sensing material and preparation and application method thereof

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preparation example Construction

[0035] Preparation of graphene oxide:

[0036] Pre-oxidize 10g flake graphite with 100ml concentrated sulfuric acid, 8g potassium persulfate and 8g phosphorus pentoxide (80°C, 4 hours), centrifuge, wash (wash to neutral with deionized water), dry (50°C under vacuum 12 hours) to obtain pre-oxidized graphite; 4g pre-oxidized graphite, 4g sodium nitrate and 104ml sulfuric acid were stirred in an ice bath, then 21g potassium permanganate was added in three batches, reacted for 4h, moved to a 40°C water bath for 40min, and then Add 600ml of deionized water, raise the temperature to 95°C and keep it warm for 10 minutes, then add excess hydrogen peroxide until no bubbles are generated, let it stand still, pour off the supernatant, add water to the lower layer and centrifugally wash until neutral, dry at 40°C for 12 hours, and obtain graphene oxide .

Embodiment 1

[0038] (1) Ultrasonic dispersion of graphene oxide in deionized water (ultrasonic power is 100W, ultrasonic 2 hours), to obtain a graphene oxide aqueous solution with a concentration of 5mg / ml;

[0039] (2) Add carboxymethyl cellulose sodium powder to the graphene oxide aqueous solution prepared in step (1), and stir together for 2 hours under 40°C water bath conditions (the stirring speed is 400 rpm), wherein graphene oxide and carboxylate The mass ratio of sodium methylcellulose is 20:1, and then stand for 12 hours to fully cross-link the mixed solution, form ice at -40°C, and then vacuum freeze-dry (-40°C, 20Pa) for 60 hours to obtain graphene oxide / fiber Plain airgel;

[0040] (3) Gas-phase reduction of graphene oxide / cellulose airgel with hydrazine hydrate (reduction temperature is 80°C, reduction time is 3h, hydrazine hydrate steam-reduces airgel in a reactor), and dried at 120°C for 12 hours to obtain Highly elastic graphene composite deformation sensing material RGO / C...

Embodiment 2

[0042] (1) Ultrasonic dispersion of graphene oxide in deionized water (ultrasonic power is 100W, ultrasonic 2 hours), to obtain a graphene oxide aqueous solution with a concentration of 5mg / ml;

[0043] (2) Add carboxymethylcellulose sodium powder into the graphene oxide aqueous solution prepared in step (1) and stir together for 2 hours under 40°C water bath conditions (the stirring speed is 400 rpm), wherein graphene oxide and carboxymethyl The mass ratio of base cellulose sodium is 10:1, and then let stand for 12 hours to fully cross-link the mixed solution, form ice at -40°C, and then vacuum freeze-dry (-40°C, 20Pa) for 60 hours to obtain graphene oxide / cellulose Aerogel;

[0044] (3) Gas-phase reduction of graphene oxide / cellulose airgel with hydrazine hydrate (reduction temperature is 80°C, reduction time is 3h, hydrazine hydrate steam-reduces airgel in a reactor), and dried at 120°C for 12 hours to obtain Highly elastic graphene composite deformation sensing material R...

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Abstract

The invention belongs to the technical field of deformation sensing materials and discloses a high-elasticity graphene composite deformation sensing material and a preparation and application method thereof. The preparation method of the high-elasticity graphene composite deformation sensing material comprises (1) dispersing graphene oxide in water to obtain graphene oxide dispersing agent; (2) stirring cellulose derivatives inside the graphene oxide dispersing agent, performing standing and freeze-drying processes to obtain graphene oxide / cellulose aerogel; (3) reducing the graphene oxide / cellulose aerogel through reducing agent, and then performing thermal drying to obtain the high-elasticity graphene composite deformation sensing material. The preparation method of the high-elasticity graphene composite deformation sensing material is simple, efficient, green and environmentally friendly; the prepared high-elasticity graphene composite deformation sensing material is high in stable sensing performance and can achieve more than 4000 times of repeated and rapid loading and unloading under 70% stress conditions and recover within 1 second, thereby being good in elastic property; during deformation, the high-elasticity graphene composite deformation sensing material obtains stable, reliable and regular electrical resistance response. The high-elasticity graphene composite deformation sensing material is applied to the field of deformation sensing.

Description

technical field [0001] The invention belongs to the technical field of preparation of graphene composite deformation sensing materials, in particular to a highly elastic graphene composite deformation sensing material and its preparation method and application. Background technique [0002] Flexible deformation sensing materials can convert the deformation of materials into electrical signals, and are widely used in many fields such as automobiles, electronic skins, robots, and wearable devices. Graphene composite aerogels with good conductivity and flexibility have attracted the attention of researchers. Because the graphene composite deformation sensing material has high electrical conductivity, sensitive response, and stable signal response, it has become an ideal flexible sensing material. [0003] However, three-dimensional graphene airgel materials are agglomerated due to the π-π interaction and van der Waals force between graphene sheets, resulting in the collapse of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/28C08K3/04C08J9/28C08J3/075
CPCC08J3/075C08J9/28C08J2301/28C08K3/04C08L2201/06C08L1/286C08L1/284
Inventor 王慧黄智明刘霄昱
Owner SOUTH CHINA UNIV OF TECH
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