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A kind of graphene/sodium alginate/carbon nanotube composite elastic aerogel for strain sensor and preparation method thereof

A carbon nanotube composite, strain sensor technology, applied in aerogel preparation, chemical instruments and methods, instruments, etc., can solve the problems of complex preparation process, unstable resistance, limiting the practical application of mixed aerogel, etc. The method is simple and practical, the resistance change is sensitive, and the effect of excellent strain sensing performance

Active Publication Date: 2020-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the preparation process of these reports is usually complicated, the electrical resistance is unstable, and cyclic deformations such as compression, bending, stretching, or changing torsion greatly limit the practical application of hybrid aerogels.

Method used

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  • A kind of graphene/sodium alginate/carbon nanotube composite elastic aerogel for strain sensor and preparation method thereof
  • A kind of graphene/sodium alginate/carbon nanotube composite elastic aerogel for strain sensor and preparation method thereof
  • A kind of graphene/sodium alginate/carbon nanotube composite elastic aerogel for strain sensor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The preparation of the graphene / sodium alginate / carbon nanotube composite elastic airgel for strain sensor specifically includes the following steps:

[0052] (1) Place the prepared graphene oxide in deionized water, and adjust the concentration of the graphene oxide aqueous solution to 5 mg·mL -1 , sonicate for 2.5 h to disperse evenly; then sodium alginate (SA) solution (1 mg·mL -1 ), graphene oxide (GO) solution (1mg·mL -1 ) and carbon nanotubes (CNTs) suspension (1 mg·mL -1 ) was mixed according to the mass ratio GO:SA:CNTs=GO:SA:CNTs=20:7:3, and the mixture was stirred continuously at 140rpm for 3.5 hours, then put into a freeze dryer, and freeze-dried at -58°C for 48 hours. Obtain composite airgel;

[0053] (2) Then, the obtained composite airgel was placed in a tetrafluoroethylene reactor (ceramic microbeads were silicon nitride), and 4 N 2 ·H 2 Under O steam atmosphere, the reduction reaction was carried out at 100°C for 8 hours; after the reaction, it was...

Embodiment 2

[0055] The preparation of the graphene / sodium alginate / carbon nanotube composite elastic airgel for strain sensor specifically includes the following steps:

[0056] (1) Place the prepared graphene oxide in deionized water, and adjust the concentration of the graphene oxide aqueous solution to 3 mg•mL -1 , sonicate for 1.5 h to disperse evenly; then sodium alginate (SA) solution (3 mg·mL -1 ), graphene oxide (GO) solution (3mg·mL -1 ) and carbon nanotubes (CNTs) suspension (3mg·mL -1 ) After mixing according to the mass ratio GO:SA:CNTs=20:5:5, the mixture was continuously stirred at 130rpm for 2.5 hours, then put into a freeze dryer, and freeze-dried at -65°C for 48 hours to obtain a composite airgel;

[0057] (2) Then, the obtained composite airgel was placed in a tetrafluoroethylene reactor (ceramic microbeads were silicon nitride), and 4 N 2 ·H 2 Under O steam atmosphere, carry out the reduction reaction at 85°C for 10.5 hours; after the reaction, let it stand and ven...

Embodiment 3

[0059] The preparation of the graphene / sodium alginate / carbon nanotube composite elastic airgel for strain sensor specifically includes the following steps:

[0060] (1) Place the prepared graphene oxide in deionized water, and adjust the concentration of the graphene oxide aqueous solution to 4 mg•mL -1 , sonicated for 1h to disperse evenly; then sodium alginate (SA) solution (4mg·mL -1 ), graphene oxide (GO) solution (4mg·mL -1 ) and carbon nanotubes (CNTs) suspension (4mg·mL -1 ) After mixing according to the mass ratio GO:SA:CNTs=20:3:7, the mixture was continuously stirred at 150rpm for 2 hours, then put into a freeze dryer, and freeze-dried at -60°C for 48 hours to obtain a composite airgel;

[0061] (2) Then, the obtained composite airgel was placed in a tetrafluoroethylene reactor (ceramic microbeads were zirconia), and 4 N 2 ·H 2 Under O steam atmosphere, carry out reduction reaction at 90 DEG C for 10 hours; After the reaction is over, let it stand for ventilati...

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Abstract

The invention discloses graphene / sodium alga acid / carbon nano tube compound elastic aerogel applied in a strain sensor and a preparation method of the graphene / sodium alga acid / carbon nano tube compound elastic aerogel. The method comprises the following steps: on the basis of an idea of building a fiber-reinforced composite and adopting a carbon nano tube for improving sensitivity, mixing graphene, sodium alga acid and the carbon nano tube to form aerogel, carrying out reduction reaction in an H4N2.H2O steam atmosphere, and preparing to obtain the graphene / sodium alga acid / carbon nano tube compound elastic aerogel applied in the strain sensor. The aerogel provided by the invention has high mechanical endurance, favorable elasticity, structural continuity and high sensitivity; through controlling the matching proportion of the graphene, the sodium alga acid and the carbon nano tube, the regulation of a pore structure of the aerogel is controlled, and a more regular network is formed, so that mechanical performance and resistance change response performance of the aerogel are regulated and controlled; meanwhile, through sufficient reduction of hydrazine hydrate steam, the prepared aerogel has hydrophobic performance.

Description

technical field [0001] The invention belongs to the field of strain sensor materials, in particular to a graphene / sodium alginate / carbon nanotube composite elastic airgel and a preparation method thereof. Background technique [0002] Highly elastic strain sensors have become a research hotspot due to their applications in structural health detection, electronic skin, stretchable solar cells, and pressure distribution analysis. So far, elastic strain sensors have generally been fabricated by using carbon black, carbon nanotubes, graphene, nanowires, nanoparticles, and their composite nanostructured organizations. For example, Gong Shu, Schwalb Willem et al. constructed a highly sensitive, flexible pressure sensor by sandwiching ultrathin gold nanowire-impregnated tissue paper between two thin polydimethylsiloxane sheets (Gong S, Schwalb W, Wang Y, et al. A wearable and highly sensitive pressure sensor with ultrathin gold nanowires[J]. Nature Communications, 2014, 5(2):3132....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00G01B21/32
CPCB01J13/0091G01B21/32
Inventor 钟明峰吴文刚张志杰张腾飞
Owner SOUTH CHINA UNIV OF TECH
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