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Preparation method of graphene

A graphene and sugar technology, applied in the field of material preparation, can solve problems such as the inability of large-scale and high-quality preparation of graphene, and achieve the effects of easy availability, environmental friendliness and low cost

Inactive Publication Date: 2021-04-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a method for preparing graphene, which is used to solve the technical problem that existing preparation methods cannot prepare graphene with large scale and high quality

Method used

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  • Preparation method of graphene
  • Preparation method of graphene
  • Preparation method of graphene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of preparation method of graphene, such as figure 1 shown, including:

[0046] The graphene precursor is prepared by reacting in a solvent medium by chemical synthesis;

[0047] Graphene is obtained by anaerobic calcination of graphene precursors;

[0048] Wherein, the reaction raw materials of the chemical synthesis are active metals and sugars, and the active metals are alkali metals and / or alkaline earth metals.

[0049] Graphene precursors are compounds composed of elements such as carbon, hydrogen, and oxygen.

[0050] Compared with the existing micromechanical exfoliation method, re-reduction method of graphite oxide, chemical vapor deposition method, and epitaxial growth method, the method of this embodiment is directly produced by a synthesis reaction, with easy operation and simple steps, so it is suitable for industrialization. Large-scale production; secondly, the raw materials used can be active metals and sugars, the raw materials are easy to obta...

example 1

[0074] 1. Synthesis of Graphene

[0075] Dissolve 1g of glucose in 50mL of ethanol, and then react with 5g of sodium metal in a 600mL closed stainless steel reactor at 120°C for 108 hours to obtain the precursor of graphene. ℃ calcination for 30 hours to obtain graphene.

[0076] 2. Purification of Graphene

[0077] Dissolve the graphene prepared in step 1 in acetone; add methanol to the acetone solution containing graphene, ultrasonically disperse for 20 minutes, and then filter to obtain a solid substance; then use deionized water to wash and filter the solid substance, and repeat for more times; dry the solid matter in an oven at 100°C to obtain purified graphene.

[0078] like figure 2 SEM images of the as-prepared graphene are shown.

example 2

[0080] 1. Synthesis of Graphene

[0081] Dissolve 1g of sucrose in 50mL of ethanol, and then react with 5g of sodium metal in a 600mL airtight stainless steel reactor at 800°C for 108 hours to obtain a graphene precursor. ℃ calcination for 30 hours to obtain graphene.

[0082] 2. Purification of Graphene

[0083] Purify the synthesized graphene in the same manner as Example 1 to obtain purified graphene.

[0084] like image 3 SEM images of the as-prepared graphene are shown.

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Abstract

The invention belongs to the field of material preparation, and particularly discloses a preparation method of graphene, which comprises the following steps: reacting in a solvent medium in a chemicalsynthesis mode to prepare a graphene precursor; and carrying out anaerobic calcination on the graphene precursor to obtain the graphene, wherein reaction raw materials for chemical synthesis are active metals and saccharides, the reaction temperature is preferably between 120 DEG C and 800 DEG C; the molar ratio of the active metal to the saccharides is 100: 1-1: 100; the active metal is preferably sodium, potassium, calcium and strontium; the saccharides are preferably glucose, fructose, galactose, xylose, lactose, cane sugar and maltose; preferably, the calcining process is to calcine for 0.1-30 hours at the temperature of 200-800 DEG C under an anaerobic condition; preferably, the prepared graphene is subjected to post-treatment to improve the purity. The method has the characteristicsof simple operation, low cost, high yield and the like, is suitable for large-scale production, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of material preparation, and more specifically relates to a method for preparing graphene. Background technique [0002] Graphene is a new type of two-dimensional planar carbon material discovered in 2004 (Novoselov, K.S. et al. Science 306, 666-669 (2004)), and its thickness is defined between 1-10 carbon atoms. Studies have shown that when the thickness of the graphite layer is less than 10 carbon atomic layers, the graphite sheet exhibits a different electronic structure from ordinary three-dimensional graphite, which is called graphene. When the thickness exceeds 10 carbon atomic layers at most, graphite flakes no longer exhibit a series of special properties of graphene, and become no different from ordinary three-dimensional graphite flakes. According to the thickness of graphene, that is, the number of carbon layers, it can be divided into single-layer graphene, double-layer graphene and few-layer graphene. ...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B32/196
CPCC01B32/184C01B32/196C01B2204/30
Inventor 黄青武
Owner HUAZHONG UNIV OF SCI & TECH