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A kind of carbon sponge and its preparation method and pressure sensor

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

Active Publication Date: 2020-05-26
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] To sum up, there is no report on the preparation of carbon sponges with omnidirectional compressible superelasticity, omnidirectional recoverable compressibility, high strength and high conductivity at low cost and good controllability.

Method used

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  • A kind of carbon sponge and its preparation method and pressure sensor
  • A kind of carbon sponge and its preparation method and pressure sensor
  • A kind of carbon sponge and its preparation method and pressure sensor

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Experimental program
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preparation example Construction

[0191] like Figure 14 Shown, the present invention also provides a kind of preparation method of omnidirectional compressible superelastic carbon sponge, comprises the following steps:

[0192] Step 1, dispersing the additive and graphene oxide into a solvent to form a mixed solution of graphene oxide and additive.

[0193] Step 2, drying the mixed solution to obtain an additive-containing graphene oxide sponge.

[0194] Step 3, heat-treat the additive-containing graphene oxide sponge at high temperature under the protection of an inert gas to obtain a carbon sponge or a full carbon sponge.

[0195] Specifically, the additive is one or more of small molecule organic acids. Preferably, the additive is one or more of ascorbic acid, citric acid, tartaric acid, lactic acid and benzoic acid. The solvent is water and an organic solvent for dispersing the additive and graphene oxide. Preferably, the solvent is one or a mixture of water, ethanol, acetone, dimethylformamide, and c...

specific Embodiment 1

[0210] Step (a) disperse 15 parts by mass of graphene oxide and 45 parts by mass of citric acid into 400 parts by mass of water to form graphene oxide and additive dispersion.

[0211] Step (b) Injecting the graphene oxide and citric acid dispersion into a hollow spherical mold for freeze-drying to obtain a hollow spherical additive-containing graphene oxide sponge.

[0212] Step (c) heat-treating the hollow spherical additive-containing graphene oxide sponge under the protection of a nitrogen atmosphere at 400° C. for 4 hours to obtain a hollow spherical carbon sponge.

[0213] The hollow spherical carbon sponge graphene obtained by the method accounts for 45%, and the amorphous carbon accounts for 55%. The atomic percentage of oxygen element is 15%, which is a slightly reduced carbon sponge. It has superelasticity in all directions, and the recoverable compressive strain in different directions is 90%-99%. Strength greater than 450kPa. The density is 8.5mg / cm 3 , Conduct...

specific Embodiment 2

[0216] Step (a) disperse 45 parts by mass of graphene oxide into 450 parts by mass of water to form graphene oxide and additive dispersion.

[0217] Step (b) injecting the graphene oxide dispersion liquid into a cuboid mold for supercritical drying to obtain a cuboid graphene oxide sponge, the proportion of additives is 0%, and the proportion of graphene oxide is 100%.

[0218] Step (c) heat-treating the rectangular parallelepiped graphene oxide sponge at 800° C. for 4 hours under the protection of a nitrogen atmosphere to obtain a rectangular parallelepiped carbon sponge.

[0219] The carbon sponge graphene obtained by the method accounts for 100% and does not contain amorphous carbon. The atomic percentage of oxygen element is 60%, which is a slightly reduced carbon sponge. Without superelasticity, the recoverable strain is 0%, and the density is 3.5mg / cm 3 . Conductance is less than 70S / m.

[0220] In this example, the additive is a small molecule organic acid; the rati...

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Abstract

The invention provides a carbon sponge 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 sponge 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 small molecular organic acid additive and graphene oxide into a solvent to form a graphene oxide and additive mixed dispersing solution, drying the mixed solution toobtain an additive-containing graphene oxide sponge, and carrying out high-temperature heat treatment on the additive-containing graphene oxide sponge under the protection of an inert gas to obtain the carbon sponge, wherein the obtained carbon sponge has characteristics of omnidirectional compressible super-elasticity, omnidirectional reversible compressibility, high strength and high electricalconductivity. The present invention further relates to a tactile and pressure sensor based on the sponge, and a preparation method thereof.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a carbon sponge, a preparation method thereof and a pressure sensor. Background technique [0002] Sponge is a kind of porous material with good elasticity, and airgel is called "super sponge". 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 common airgel is silica airgel, which is widely used in heat insulation, sound insulation, shock absorption and other fields. In recent years, all-carbon aerogels, especially graphene aerogels, have attracted extensive attention from researchers and industries. Since graphene has high electrical conductivity (1×10 6 S / m), high modulus (1TPa), high strength (130GPa) and high specific surface area (26...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/00C01B32/184C01B32/198C01B32/05G01L5/00
CPCC01B2204/22C01B2204/30C01P2004/01C01P2006/10C01P2006/16C01P2006/40C01P2006/80G01L5/00
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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