Preparation method of high-strength flexible graphene foam body

A flexible graphite, high-strength technology, applied in graphene, nano-carbon and other directions, can solve the problems of insufficient mechanical strength and performance degradation of three-dimensional graphene, and achieve the effect of large-scale production, low production cost and few processes.

Inactive Publication Date: 2017-12-12
CHONGQING UNIV
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Problems solved by technology

[0005] The present invention aims at defects such as lack of mechanical strength of three-dimensional graphene prepared by the existing CVD method, difficulty in transferring and performance decline after transfer, and provides a method for preparing a high-strength flexible graphene foam. The method has the advantages of convenient operation and low production cost. , high product performance, strong applicability and other advantages

Method used

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  • Preparation method of high-strength flexible graphene foam body
  • Preparation method of high-strength flexible graphene foam body

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Experimental program
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Effect test

Embodiment 1

[0034] A kind of preparation method of high strength flexible graphene foam body, it is characterized in that the concrete steps of described method are as follows:

[0035] (1) Metal foam surface treatment

[0036] The metal foam has a bulk density of 0.8g / cm 3 , nickel foam with a thickness of 1mm;

[0037] ① Soak the nickel foam completely in 0.1M dilute hydrochloric acid, and ultrasonically clean it for 10 minutes under the condition of ultrasonic power of 70W to remove the oxide on the surface;

[0038] ② Wash the nickel foam with deionized water for 10 minutes until the deionized water is neutral to completely remove residual hydrochloric acid;

[0039] ③Finally, wash the nickel foam with absolute ethanol for 10 minutes and let it dry in a cool place.

[0040] (2) Loading of carbon nano toughening agent

[0041] ① prepare the aqueous solution A of F127, the concentration of the surfactant in the solution A is 0.5g / L;

[0042] 2. Disperse the reduced graphene nanobel...

Embodiment 2

[0054] A kind of preparation method of high strength flexible graphene foam, with embodiment 1, wherein:

[0055] In the (1) step, the metal foam is iron foam with a thickness of 1mm and a bulk density of 0.5g / cm 3 ; The concentration of hydrochloric acid is 1M, wash for 3 minutes; wash with deionized water and absolute ethanol for 10 minutes respectively.

[0056] In the (2) step, the carbon nano toughening agent is an oxidized graphene nanoribbon with a width of 5nm and a length of 30um, and the dispersion concentration is 5.0g / L; the surfactant is SDBS, and the concentration is 5.0g / L. L.

[0057] In step (3), the constant temperature interval is 1070°C, and the thermal reduction time is 10 minutes; the inert gas is helium; the carbon source is acetylene, and the flow ratio during chemical vapor growth is C 2 h 2 :H 2 =3:20, CVD time is 10 minutes; cooling rate is 100°C / min.

[0058] In the (4) step, the etching solution is prepared according to the molar volume ratio ...

Embodiment 3

[0060] A kind of preparation method of high strength flexible graphene foam, with embodiment 1, wherein:

[0061] In step (1), the metal foam is copper foam with a thickness of 1mm and a bulk density of 0.8g / cm 3 ; Wash with 2M hydrochloric acid for 5 minutes under the condition of ultrasonic power of 60W; wash with deionized water and absolute ethanol for 10 minutes respectively.

[0062] In the (2) step, the carbon nano-toughening agent is a single-walled carbon nanotube with partial openings treated by a thermal acid method, with a width of 2nm and a length of 30um, and the concentration of the dispersion is 3.0g / L; the surface activity The agent is SDS, the concentration is 1.0g / L.

[0063] In the (3) step, the constant temperature interval is 1000 DEG C, and the thermal reduction time is 12 minutes; the inert gas is radon; the carbon source is ethylene, and the flow ratio C is during chemical vapor phase growth. 2 h 4 :H 2 =1:30, CVD time is 20 minutes; cooling rate i...

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Abstract

The invention relates to a preparation method of a high-strength flexible graphene foam body, and belongs to the technical field of graphene materials. The preparation method comprises the following steps: loading carbon nanoscale toughening agents on the surface of foam metal uniformly, and performing CVD and removing the matrix to obtain the high-strength flexible graphene foam body. The carbon nanoscale toughening agents and graphene generate covalent bond combination to realize in-situ toughening of the graphene foam body, so that the mechanical property of the graphene foam body is improved, and assistance of the polymer in the metal matrix removing and transferring processes is not needed. The method has the characteristics of simple process, convenience in operation, controllable product appearance, suitability for large-scale production, convenience in popularization and application, low production cost and the like. The graphene foam body prepared by the method has excellent mechanical property, has the characteristics of small specific gravity, large specific surface area, high flexibility, high electric conductivity, high heat conductivity and the like, and can be widely applied in the fields of adsorption, electric catalysis, high-sensitivity sensors, energy storage, flexible electronic devices and the like.

Description

technical field [0001] The invention belongs to the technical field of graphene preparation, in particular to the preparation technology of in-situ toughened graphene foam by a carbon nano toughening agent. Background technique [0002] Graphene foam has the characteristics of developed pore structure, high surface activity, strong conductivity and loadability, and high mass transfer rate. It has broad application prospects in adsorption, catalyst support, electrochemical energy storage, electrocatalysis, and electronic devices. At present, the methods for preparing graphene foam mainly include hydrothermal method, redox method and vapor phase deposition method. Among them, the hydrothermal method requires high temperature and is relatively time-consuming, so it is difficult to apply to actual production; during the preparation process of redox method, due to Oxygen-containing functional groups on the surface are not completely removed, resulting in a charge effect that lead...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/186
Inventor 李新禄张石磊王荣华邓媛元赵奚誉
Owner CHONGQING UNIV
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