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A kind of preparation method of layer number controllable graphene

A technology of graphene and gas, which is applied in the field of preparation of layer-controlled graphene, can solve the problem of graphene that has not yet existed, and achieve the effect of easy large-scale production

Inactive Publication Date: 2016-08-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the synthesis of graphene whose layer number can be precisely adjusted by using the halogenation method.

Method used

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  • A kind of preparation method of layer number controllable graphene
  • A kind of preparation method of layer number controllable graphene
  • A kind of preparation method of layer number controllable graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Weigh 2g of a-Ti with amorphous nanoshell on the surface 0.4 C 0.6 After putting it into a quartz tube and sealing it, feed high-purity He gas at a flow rate of 500ml / min for 30 minutes so as to get rid of the air in the quartz tube, heat the furnace to 200 degrees Celsius, and keep the He gas flow rate at Under the premise of 100ml / min, feed Cl at a flow rate of 500ml / min during the reaction 2 Gas, stop feeding Cl after one hour of reaction 2 gas while keeping the He gas flowing in, keeping the reaction temperature at 200° C. for one hour and then lowering it to room temperature to obtain nanoparticles with a graphene structure of 1 to 3 layers on the surface. figure 1 It is a transmission electron microscope image (TEM) of nano-TiC with amorphous nano-film on the surface; as figure 2 It is a transmission electron microscope image of nanoparticles with a 2-layer graphene structure on the surface after halogenation at 200°C in Example 1, wherein the crystalline TiC ...

Embodiment 2

[0054] The preparation process and steps in this example are exactly the same as those in Example 1 above. The difference is: the reaction temperature is 400°C. Finally, nanoparticles with a graphene structure of 2-4 layers on the surface can be obtained.

Embodiment 3

[0056] The preparation process and steps in this example are exactly the same as those in Example 1 above. The difference is: the reaction temperature is 600°C. Nanoparticles with a graphene structure of 4-5 layers on the surface can be finally obtained. Figure 4 After the nano-TiC with amorphous nano-shells on the surface is halogenated at 600°C in Example 3, the transmission electron microscope image of nanoparticles with a 5-layer graphene structure on the surface;

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Abstract

The invention relates to a preparation method of controllable-layer-number graphene, which comprises the following steps: putting amorphous carbide in a heating furnace, introducing inert gas to expel air under ordinary pressure, starting quick heating, and introducing halogen gas or halogen-containing gas while keeping the inert gas flow rate when the temperature reaches 200-1400 DEG C, wherein the halogen gas or halogen-containing gas reacts with the non-carbon element in the carbide to form halide which is discharged, thereby leaving the carbon element material; and after the reaction is finished, on the premise of keeping the temperature constant, stopping introducing the halogen gas or halogen-containing gas, keeping introducing the inert gas to remove the remnant halide gas and reaction byproduct, and cooling room temperature in the inert gas atmosphere. The method can satisfy the requirements of different fields for different layer numbers of graphene; the adhesive force between the graphene and substrate is small, so that the graphene can be conveniently peeled from the substrate; and the reaction can be performed under ordinary pressure and milder conditions.

Description

technical field [0001] The invention relates to a method for preparing graphene with a controllable layer number, which is suitable for large-scale preparation of graphene with a controllable layer number. technical background [0002] Since graphene was prepared by mechanical exfoliation in 2004 [1], graphene has become a research hotspot because of its excellent electron mobility, high theoretical specific surface area, high thermal conductivity and high chemical stability. [2-5] These excellent and unique properties make graphene have great application prospects in energy conversion and storage, such as fuel cell catalysts, photocatalysis and solar cell materials. [4, 5] [0003] In order to apply these excellent properties of graphene to practice, large-scale and low-cost synthesis of graphene with controllable layer number is a prerequisite. In recent years, researchers have proposed many methods for synthesizing graphene. For example, mechanical exfoliation was firs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 木士春彭焘
Owner WUHAN UNIV OF TECH
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