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Carbon aerogel and preparation method thereof, and pressure sensor

A carbon aerogel, pressure technology, applied in the field of nanomaterials

Active Publication Date: 2018-07-27
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, there is no report on the preparation of carbon aerogels with omnidirectional compressible superelasticity, omnidirectional recoverable compressibility, high strength and high conductivity at low cost and good controllability.

Method used

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  • Carbon aerogel and preparation method thereof, and pressure sensor
  • Carbon aerogel and preparation method thereof, and pressure sensor
  • Carbon aerogel and preparation method thereof, and pressure sensor

Examples

Experimental program
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preparation example Construction

[0145] Such as Figure 13 , the preparation method of omnidirectional compressible superelastic carbon airgel, comprises the following steps: 1) disperse additive and graphene oxide in solvent to form graphene oxide and additive mixed solution; 2) described mixed solution is dried, Obtaining the graphene oxide aerogel containing the additive; 3) heat-treating the graphene oxide aerogel containing the additive at high temperature under the protection of an inert gas to obtain a carbon aerogel or an all-carbon aerogel.

[0146] Wherein the additive is one or more of monosaccharides, disaccharides, oligosaccharides or polysaccharides;

[0147] Preferably, the monosaccharide is one or more of glucose, fructose, galactose and ribose;

[0148] Preferably, the disaccharide is one or more of maltose, sucrose and lactose;

[0149] Preferably, the oligosaccharide is one or more of raffinose and stachyose;

[0150] Preferably, the polysaccharide is one or more of starch, cellulose, glyc...

specific Embodiment 1

[0175] Step (a) disperse 10 mass parts of graphene oxide and 40 mass parts of sucrose into 500 mass parts of water to form graphene oxide and additive dispersion.

[0176] Step (b) injecting the graphene oxide and sucrose dispersion into a hollow spherical mold for freeze-drying to obtain a hollow spherical additive-containing graphene oxide airgel.

[0177] Step (c) heat-treating the hollow spherical additive-containing graphene oxide airgel at 600° C. for 4 hours under the protection of a nitrogen atmosphere to obtain a hollow spherical carbon airgel.

[0178] The hollow spherical carbon airgel graphene obtained by the method accounts for 80%, and the amorphous carbon accounts for 20%. The atomic percentage of oxygen element is 20%, and it is a slightly reduced carbon airgel. All have omnidirectional compressible superelasticity, and the recoverable compressive strain in different directions is 80%-99%. Strength greater than 700kPa. The density is 10mg / cm 3 , Conductivit...

specific Embodiment 2

[0180] Step (a) disperse 5 parts by mass of graphene oxide into 500 parts by mass of water to form graphene oxide and additive dispersion.

[0181] Step (b) injecting the graphene oxide dispersion liquid into a cuboid mold for supercritical drying to obtain a cuboid graphene oxide airgel, the proportion of additives is 0%, and the proportion of graphene oxide is 100%.

[0182] Step (c) heat-treating the rectangular parallelepiped graphene oxide airgel at 700° C. for 4 hours under the protection of nitrogen atmosphere to obtain the rectangular parallelepiped carbon airgel.

[0183] The carbon airgel graphene obtained by the method accounts for 100% and does not contain amorphous carbon. The atomic percentage of oxygen element is 30%, and it is a slightly reduced carbon airgel. It does not have omnidirectional compressible superelasticity, and the recoverable strain is 0%. It has recoverable compressibility, and can recover 50% of its original length when the pressure is remove...

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Abstract

The invention provides a carbon aerogel and a preparation method thereof, and a pressure sensor, and belongs to the field of researches on nanometer materials. According to the invention, the carbon aerogel formed from amorphous carbon and graphene through a mud brick structure and having omnidirectional compressible super-elasticity, and the preparation method thereof are provided; and the preparation method comprises: dispersing a saccharide-based additive and graphene oxide into a solvent to form a graphene oxide and additive mixed dispersing solution, drying the mixed solution to obtain anadditive-containing graphene oxide aerogel, and carrying out high-temperature heat treatment on the additive-containing graphene oxide aerogel under the protection of an inert gas to obtain the carbon aerogel, wherein the obtained carbon aerogel has the omnidirectional compressible super-elasticity. The present invention further relates to a tactile and pressure sensor based on the aerogel.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a carbon airgel, a preparation method thereof and a pressure sensor. Background technique [0002] Airgel has the characteristics of large specific surface area, large porosity, low density, and low thermal conductivity. It has great application potential in the fields of electronics, aerospace, energy, chemical industry, industrial catalysis, and environmental protection. The most common aerogel is silica aerogel, which has been widely used in heat insulation, sound insulation and shock absorption. In recent years, carbon aerogels, especially graphene aerogels, have attracted extensive attention from researchers and industries. Graphene has high electrical conductivity (1×10 6 S / m), high modulus (1TPa), high strength (130GPa) and high specific surface area (2630m 2 / g) and other new two-dimensional materials with excellent properties, and graphene as the main body...

Claims

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Application Information

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IPC IPC(8): C01B32/00C01B32/184C01B32/198C01B32/05G01L1/20G01L9/02
CPCC01B2204/22C01B2204/30C01P2004/01C01P2006/10C01P2006/16C01P2006/40C01P2006/80G01L1/20G01L9/02
Inventor 肖卓建周维亚王艳春解思深
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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