A kind of preparation method of ultra-light graphene elastic airgel

Abstract

The invention provides a preparation method of an ultralight graphene elastic aerogel. The method comprises the following steps: mixing a graphite oxide aqueous solution with an aqueous solution of polyvinylpyrrolidone; forming a sol by physically connecting a functional group of a graphite oxide structural unit and polyvinylpyrrolidone by virtue of a binding effect; obtaining a graphene hydrogel by means of hydrothermal reaction reduction and self-assembly process; and freezing and drying the hydrogel to obtain the ultralight graphene elastic aerogel. The preparation method provided by the invention is simple, and the obtained ultralight graphene elastic aerogel has a continuous three-dimensional porous structure, an ultrahigh specific surface area, excellent elasticity and low density. In addition, when the elastic aerogel deforms, the conductivity reversibly changes correspondingly. Therefore, the prepared aerogel has a huge application prospect in adsorption and sensors.

Description

technical field

[0001] The invention belongs to the field of graphene airgel preparation, in particular to a preparation method of ultra-light graphene elastic airgel. Background technique

[0002] Since scientists successfully prepared graphene in 2004, its unique two-dimensional structure and excellent performance have attracted widespread attention from many scholars. Studies have shown that graphene is composed of carbon atoms hybridized by SP2, showing a regular hexagonal periodic honeycomb lattice structure. The thickness of a single layer of graphene is about 0.35nm. Two-dimensional graphene can be warped and wound , stacking, etc. to form zero-dimensional fullerenes, one-dimensional carbon nanotubes and three-dimensional graphite. The excellent mechanical properties, electrical properties and thermodynamic properties of graphene have been widely used in energy storage, environmental protection, catalysis and so on.

[0003] Aerogels are porous nanomaterials with lo...

Examples

Embodiment 1

[0032] At room temperature, weigh 120 mg of graphite oxide, place it in a 100 mL beaker, add 40 mL of distilled water to make a dispersion of graphite oxide concentration of 3 mg / mL, and then put the beaker into an ultrasonic instrument for ultrasonic treatment for 1 h; at the same room temperature, Weigh 60 mg of polyvinylpyrrolidone, place it in a 50mL beaker, add 20mL of distilled water to the beaker, and ultrasonically process the polyvinylpyrrolidone solution for 5 minutes to obtain a uniformly dispersed polyvinylpyrrolidone solution; The polyvinylpyrrolidone solution was mixed, stirred by magnetic force for 5min, and then the mixed solution was continued to be ultrasonically treated for 1h to obtain 60mL of uniformly dispersed sol; Put the steel jacket on, put it in an oven that raised the temperature to 180°C in advance, do a hydrothermal reaction in the oven for 10 hours, turn off the oven, and cool to room temperature naturally; open the hydrothermal kettle to get the ...

Embodiment 2

[0034] At room temperature, weigh 240 mg of graphite oxide, place it in a 100 mL beaker, add 40 mL of distilled water to make a dispersion of graphite oxide with a concentration of 6 mg / mL, and then put the beaker into an ultrasonic instrument for ultrasonic treatment for 1 h; at the same room temperature, Weigh 120mg of polyvinylpyrrolidone, place it in a 50mL beaker, add 20mL of distilled water to the beaker, and carry out ultrasonic treatment to the polyvinylpyrrolidone solution for 5min to obtain a uniformly dispersed polyvinylpyrrolidone solution; The polyvinylpyrrolidone solution was mixed, stirred by magnetic force for 5min, and then the mixed solution was continued to be ultrasonically treated for 1h to obtain 60mL of uniformly dispersed sol; Put the steel jacket on, put it in an oven that raised the temperature to 180°C in advance, do a hydrothermal reaction in the oven for 10 hours, turn off the oven, and cool to room temperature naturally; open the hydrothermal kettl...

Embodiment 3

[0036]At room temperature, weigh 120 mg of graphite oxide, place it in a 100 mL beaker, add 40 mL of distilled water to make a dispersion of graphite oxide concentration of 3 mg / mL, and then put the beaker into an ultrasonic instrument for ultrasonic treatment for 1 h; at the same room temperature, Weigh 60 mg of polyvinylpyrrolidone, place it in a 50mL beaker, add 20mL of distilled water to the beaker, and ultrasonically process the polyvinylpyrrolidone solution for 5 minutes to obtain a uniformly dispersed polyvinylpyrrolidone solution; The polyvinylpyrrolidone solution was mixed, stirred by magnetic force for 5min, and then the mixed solution was continued to be ultrasonically treated for 1h to obtain 60mL of uniformly dispersed sol; Put the steel jacket on, put it into an oven that raised the temperature to 150°C in advance, do a hydrothermal reaction in the oven for 10 hours, turn off the oven, and cool to room temperature naturally; open the hydrothermal kettle to get the...

technical field

[0001] The invention belongs to the field of graphene airgel preparation, in particular to a preparation method of ultra-light graphene elastic airgel. Background technique

[0002] Since scientists successfully prepared graphene in 2004, its unique two-dimensional structure and excellent performance have attracted widespread attention from many scholars. Studies have shown that graphene is composed of carbon atoms hybridized by SP2, showing a regular hexagonal periodic honeycomb lattice structure. The thickness of a single layer of graphene is about 0.35nm. Two-dimensional graphene can be warped and wound , stacking, etc. to form zero-dimensional fullerenes, one-dimensional carbon nanotubes and three-dimensional graphite. The excellent mechanical properties, electrical properties and thermodynamic properties of graphene have been widely used in energy storage, environmental protection, catalysis and so on.

[0003] Aerogels are porous nanomaterials with lo...

Examples

Embodiment 1

[0032] At room temperature, weigh 120 mg of graphite oxide, place it in a 100 mL beaker, add 40 mL of distilled water to make a dispersion of graphite oxide concentration of 3 mg / mL, and then put the beaker into an ultrasonic instrument for ultrasonic treatment for 1 h; at the same room temperature, Weigh 60 mg of polyvinylpyrrolidone, place it in a 50mL beaker, add 20mL of distilled water to the beaker, and ultrasonically process the polyvinylpyrrolidone solution for 5 minutes to obtain a uniformly dispersed polyvinylpyrrolidone solution; The polyvinylpyrrolidone solution was mixed, stirred by magnetic force for 5min, and then the mixed solution was continued to be ultrasonically treated for 1h to obtain 60mL of uniformly dispersed sol; Put the steel jacket on, put it in an oven that raised the temperature to 180°C in advance, do a hydrothermal reaction in the oven for 10 hours, turn off the oven, and cool to room temperature naturally; open the hydrothermal kettle to get the ...

Embodiment 2

[0034] At room temperature, weigh 240 mg of graphite oxide, place it in a 100 mL beaker, add 40 mL of distilled water to make a dispersion of graphite oxide with a concentration of 6 mg / mL, and then put the beaker into an ultrasonic instrument for ultrasonic treatment for 1 h; at the same room temperature, Weigh 120mg of polyvinylpyrrolidone, place it in a 50mL beaker, add 20mL of distilled water to the beaker, and carry out ultrasonic treatment to the polyvinylpyrrolidone solution for 5min to obtain a uniformly dispersed polyvinylpyrrolidone solution; The polyvinylpyrrolidone solution was mixed, stirred by magnetic force for 5min, and then the mixed solution was continued to be ultrasonically treated for 1h to obtain 60mL of uniformly dispersed sol; Put the steel jacket on, put it in an oven that raised the temperature to 180°C in advance, do a hydrothermal reaction in the oven for 10 hours, turn off the oven, and cool to room temperature naturally; open the hydrothermal kettl...

Embodiment 3

[0036]At room temperature, weigh 120 mg of graphite oxide, place it in a 100 mL beaker, add 40 mL of distilled water to make a dispersion of graphite oxide concentration of 3 mg / mL, and then put the beaker into an ultrasonic instrument for ultrasonic treatment for 1 h; at the same room temperature, Weigh 60 mg of polyvinylpyrrolidone, place it in a 50mL beaker, add 20mL of distilled water to the beaker, and ultrasonically process the polyvinylpyrrolidone solution for 5 minutes to obtain a uniformly dispersed polyvinylpyrrolidone solution; The polyvinylpyrrolidone solution was mixed, stirred by magnetic force for 5min, and then the mixed solution was continued to be ultrasonically treated for 1h to obtain 60mL of uniformly dispersed sol; Put the steel jacket on, put it into an oven that raised the temperature to 150°C in advance, do a hydrothermal reaction in the oven for 10 hours, turn off the oven, and cool to room temperature naturally; open the hydrothermal kettle to get the...

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