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A method for preparing graphene based on laser exfoliation

A technology of laser exfoliation and graphene, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of difficult mass production of graphene and excessive ablation of graphene structure, so as to avoid excessive ablation and prepare The process is clean and pollution-free, and the process is simple

Active Publication Date: 2018-03-27
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the defects of difficulty in stable mass production and excessive ablation of the graphene structure in the existing laser preparation of graphene, the present invention proposes a method for preparing graphene based on laser exfoliation

Method used

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  • A method for preparing graphene based on laser exfoliation

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Embodiment 1

[0032] A method for preparing graphene based on laser exfoliation, combined with attached figure 1 Explain the graphene exfoliation process:

[0033] (1) Prepare sodium chloride into a supersaturated salt solution in water at 80-100°C, then soak the graphite powder and the supersaturated salt solution for more than 24 hours, so that the saturated salt solution can fully penetrate and insert into the graphite layer, and then filter out liquid, dry to obtain intercalated graphite;

[0034] (2) Grind and disperse the intercalated graphite obtained in step (1) and send it into the high-pressure tank (1). The pressure of the high-pressure tank is maintained at 0.5-0.6 MPa. The intercalated graphite is continuously sprayed into the mixing chamber (2) of the jet machine at a stable flow rate and velocity, and at the same time, three streams of compressed air with different pressures are injected into the chamber of the jet machine in the same direction, of which the first stream of co...

Embodiment 2

[0041] A method for preparing graphene based on laser exfoliation:

[0042] (1) Prepare sodium sulfate into a supersaturated salt solution in water at 80-100°C, then soak the graphite powder and the supersaturated salt solution for more than 24 hours, so that the saturated salt solution can fully penetrate and insert between the graphite layers, and then filter out the liquid , dry to obtain intercalated graphite;

[0043] (2) Grind and disperse the intercalated graphite obtained in step (1) and send it into a high-pressure tank. The pressure of the high-pressure tank is maintained at 0.5-0.6 MPa. Under the pressure of the high-pressure tank, the intercalated graphite is controlled by a valve Continuously spray into the mixing chamber of the jet machine with a stable flow rate and flow rate, and at the same time inject three streams of compressed air with different pressures into the chamber of the jet machine in the same direction, of which the pressure of the first stream of...

Embodiment 3

[0049] A method for preparing graphene based on laser exfoliation:

[0050] (1) Prepare potassium carbonate into a supersaturated salt solution in water at 80-100°C, then soak the graphite powder and the supersaturated salt solution for more than 24 hours, so that the saturated salt solution can fully penetrate and insert the graphite layer, and then filter out the liquid , dry to obtain intercalated graphite;

[0051] (2) Grind and disperse the intercalated graphite obtained in step (1) and send it into a high-pressure tank. The pressure of the high-pressure tank is maintained at a stable range of 0.8-1.0 MPa. Under the pressure of the high-pressure tank, the intercalated graphite is controlled by a valve. Continuously spray into the mixing chamber of the jet machine with a stable flow rate and flow rate, and at the same time inject three streams of compressed air with different pressures into the chamber of the jet machine in the same direction, of which the pressure of the ...

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Abstract

The invention relates to the field of graphene preparation and particularly relates to a method for preparing graphene on the basis of laser peeling. The method compriss the following steps of: inserting ionizable plasma-state soluble salt among graphite layers in advance, and applying high-speed gas flows with different pressures on graphite in a jet-flow machine to better prevent the graphite from being ablated, fused and bonded; arranging pulse laser with sequentially-increased three-level energy density at a spraying nozzle, forming a plasma state after fast ionization of the soluble salt among the graphite layers under the action of high energy of laser, continuously peeling large-granular graphite into graphene microchips, peeling the graphene microchips into multilayered graphene, and peeling the multilayered graphene into 1-3 layers of high-quality graphene. The method has the advantages that the defect of structure destruction of the graphene due to long-time scanning and irradiation of laser is overcome and the batched production is realized.

Description

technical field [0001] The invention relates to the field of graphene preparation, in particular to a method for preparing graphene based on laser stripping. Background technique [0002] Graphene is a new type of two-dimensional material, only one carbon atom thick, so it has excellent electrical conductivity, thermal conductivity, light transmittance, mechanical strength and other properties. Graphene can be widely used in many fields such as electronic information, aerospace, optoelectronic technology, green energy, biomedicine, composite reinforcement, etc., and is known as a strategic revolutionary material in the 21st century. Although graphene has a wide range of applications and a huge market capacity, the low-cost and large-scale preparation of graphene is still immature, which also restricts the large-scale development and application of graphene. With regard to its preparation method, technicians are still constantly exploring new solutions. [0003] According t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B2204/20
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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