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Single-layer graphene and preparation method thereof

A technology of single-layer graphene and graphene, applied in the field of single-layer graphene and its preparation, to achieve the effect of simple preparation equipment and easy operation

Inactive Publication Date: 2021-08-06
SHAOYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The applications in these fields put forward new requirements for graphene, that is, light weight, large specific surface area, good conductivity, etc., which poses greater challenges to the preparation of graphene.

Method used

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  • Single-layer graphene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The traditional graphene preparation method, the preparation steps are as follows:

[0028] At 0°C, 0.5g graphite and 0.5g NaNO 3 Add it into a 250mL beaker and stir it well, then slowly add 23mL of concentrated sulfuric acid to it, the mass fraction of the concentrated sulfuric acid is 95-98%, stir it thoroughly for 15-20 minutes, then add 4g of permanganate into the system Potassium and react at 35-40°C for 2 hours to obtain a green suspension, add 40 ml of deionized water to the green suspension, stir and react at 90°C for 1-2 hours to obtain a brown-yellow suspension; Add 5 mL of HO to the tan suspension 2 o 2 , to restore the remaining KMnO 4 ; After the reaction solution is cooled to room temperature, centrifuge, wash and collect the product to prepare graphene oxide.

Embodiment 1

[0034] A preparation method of single-layer graphene, comprising the steps of:

[0035] S1, by ultrasonic dispersion, 0.01moL of CuCl 2 crystals and 0.01moL InCl 3 Crystal, dissolved in the ethanol solution of 0.1g graphene oxide to form a uniform dispersion liquid, the preparation steps of the graphene oxide refer to the traditional graphene preparation method, in the present embodiment, the specific preparation steps refer to comparative example 1, so The ultrasonic dispersion time is 30min, and then 0.04moL of CS (NH 2 ) 2 Add to the dispersion and stir well;

[0036] S2, reacting in a high-pressure reactor at 180°C for 10 hours, after the reaction is complete and cooled, the obtained crude product is centrifuged and washed, and the detergent used for washing is water;

[0037] S3, placing the above crude product in hydrochloric acid with a mass fraction of 17%, ultrasonication at 60°C for 30 min, and suction filtration to obtain a black product;

[0038] S4, washing t...

Embodiment 2

[0042]A method for preparing single-layer graphene, the difference between the preparation steps and that of Example 1 is that in step S1, the ultrasonic dispersion time is 25 minutes.

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Abstract

The invention belongs to the technical field of graphene materials, and particularly relates to a preparation method of single-layer graphene. The preparation method comprises the following steps: S1, dissolving Cu<2+> and In<3+> in an ethanol solution of graphene oxide in an ultrasonic dispersion manner, adding CS(NH2)2, and fully and uniformly stirring; S2, carrying out a reaction in a high-pressure reaction kettle at 170-190 DEG C for 9-11 h, and after the reaction is completed and cooling is carried out, carrying out centrifugal separation and washing on an obtained crude product; S3, placing the crude product in hydrochloric acid, performing ultrasonic treatment for 20-50 minutes at 60 DEG C, and performing suction filtration to obtain a black product; and S4, cleaning the black product for multiple times by using an organic solvent to prepare the single-layer graphene. The preparation method has the advantages of being environmentally friendly, free of pollution, simple in preparation equipment, easy and convenient to operate and the like, and macro synthesis can be conducted in a high-pressure reaction kettle. The single-layer graphene obtained based on the preparation method is further provided.

Description

technical field [0001] The invention belongs to the technical field of graphene materials, in particular to a single-layer graphene and a preparation method thereof. Background technique [0002] Graphene is a carbon material that has developed rapidly in recent years, and its carbon atoms are represented by sp 2 Hybridized into six-membered rings arranged to have a honeycomb lattice structure. The earliest preparation method of graphene was prepared from graphite through physical methods, and the graphene obtained in this way could not be widely promoted because the amount was too small. Therefore, subsequent researchers launched large-scale experiments to find a large-scale preparation method. The most classic one is the wet chemical method using high oxidants such as potassium permanganate and concentrated sulfuric acid as raw materials. However, the graphene obtained by this method has a big defect, that is, the obtained graphene sheet structure is relatively thick, u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194C01B32/198
CPCC01B32/194C01B32/198C01B2204/02
Inventor 高锋程汝舟刘可张影
Owner SHAOYANG UNIV