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High-strength high-tenacity high-conductivity graphene membrane and preparation method thereof

A graphene film, high-strength and high-toughness technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of reduced elongation at break of graphene thin, poor fracture toughness of materials, etc., and achieve an excellent balance of rigidity and toughness The effect of high performance, high strength and good electrical conductivity

Active Publication Date: 2018-06-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such strong covalent bonds often lead to a lower elongation at break of thin graphene, which ultimately leads to poor fracture toughness of the material.

Method used

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preparation example Construction

[0027] The embodiment of the present invention discloses a method for preparing a high-strength, high-toughness, and high-conductivity graphene film, comprising the following steps:

[0028] (1) Mix a small amount of rare earth metal ions, water-soluble polymers and GO to obtain a uniform hydrosol;

[0029] (2) Casting the hydrosol into a mold and drying to obtain a GO-based film;

[0030] (3) The GO-based thin film is reduced by soaking in a reducing agent, washed, and dried to obtain a graphene film.

[0031] In the present invention, the size of the GO is 2-50 μm, preferably 5-10 μm. The GO is stored in a liquid form without drying and ultrasonication to avoid further reduction in GO size. The total concentration of the polymer and GO is 3-5 mgmL -1 , preferably 5 mg mL -1 . The mass ratio of the GO in the total weight of GO and polymer is listed as 90-99%, preferably 95%.

[0032] The water-soluble polymer needs to contain polar functional groups, which is conducive ...

Embodiment 1

[0041]118.75 mg GO, 6.25 mg PAAP and 3.75 mg Eu 3+ Mix well and prepare to a concentration of 5 mg mL -1 homogeneous hydrosol. Cast the above hydrosol on an area of ​​60 cm 2 GO film was obtained by natural evaporation at room temperature for three days in a PTFE mold. The obtained GO membrane was soaked in a 30 wt% hydroiodic acid solution and reacted at room temperature for 24 h. After repeated rinsing with deionized water and ethanol, and vacuum drying at 60°C, a graphene film with high strength, high toughness and high conductivity was obtained. The graphene film has a thickness of about 10 μm, is bendable and foldable, has a tensile fracture strength of 183 MPa, and a fracture toughness of 19 MJ m -3 , with a conductivity of 36.4 S cm -1 .

Embodiment 2

[0043] 112.5 mg GO, 2.5 mg PAAP and 3.75 mg Eu 3+ Mix well and prepare to a concentration of 5 mg mL -1 homogeneous hydrosol. Cast the above hydrosol on an area of ​​60 cm 2 GO film was obtained by natural evaporation at room temperature for three days in a PTFE mold. The obtained GO membrane was soaked in a 30 wt% hydroiodic acid solution and reacted at room temperature for 24 h. After repeated rinsing with deionized water and ethanol, and vacuum drying at 60°C, a graphene film with high strength, high toughness and high conductivity was obtained. The graphene film has a thickness of about 9 μm, is bendable and foldable, has a tensile fracture strength of 75 MPa, and a fracture toughness of 5.5 MJ m -3 , with a conductivity of 38 S cm -1 .

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Abstract

The invention relates to the technical field of fine chemical engineering, in particular to a high-strength high-tenacity high-conductivity graphene membrane and a preparation method thereof. The method comprises the following steps: mixing a few rare earth metal ions, macromolecules and graphene oxide to prepare uniform hydrosol, pouring, air drying and membrane forming, and then enabling the hydrosol to be successively subjected to the steps of reduction, cleaning and drying to obtain the graphene membrane. Three interactions are simultaneously constructed, comprising a coordinate bond between the graphene oxide and rare earth ions, a hydrogen bond between the graphene oxide and the macromolecules and pi-pi action between the graphene oxide and the macromolecules, so that the prepared modified graphene membrane has high strength, high tenacity and excellent conductivity simultaneously. According to the method, the raw materials are cheap, the operation is simple, and the method is suitable for large-scale production and has a good industrial production foundation and a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a high-strength and high-toughness conductive graphene film and a preparation method thereof. Background technique [0002] Graphene has excellent properties such as large specific surface area, light weight, high strength, and high electrical conductivity. The assembly of graphene nanosheets into two-dimensional graphene films has successfully realized the application of graphene on a macroscopic scale. So far, researchers have developed a variety of functional graphene membranes, which have been initially applied in thermal conductive materials, separation membranes, electrode materials, and electronic displays. [0003] In the development of graphene membranes, improving their mechanical properties is an important topic. Researchers can significantly improve the strength and modulus of graphene films by introducing polymers to construct covalently bonded g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B2204/22C01B2204/26C01B2204/30C01B2204/32
Inventor 冯嘉春刘月
Owner FUDAN UNIV
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