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Method for synthesizing graphene

A technology for synthesizing graphite and graphene oxide, which is applied in the field of nanomaterials, can solve problems affecting graphene electron transport and graphene device processing difficulties, and achieve mild reaction conditions, good dispersion stability, and significant application prospects Effect

Active Publication Date: 2011-07-20
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the chemical reduction method usually uses toxic or dangerous reagents, high temperature conditions, and additional surfactants to prevent the aggregation of graphene. These deficiencies will affect the electron transport of graphene and bring many difficulties to the processing of graphene devices.

Method used

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  • Method for synthesizing graphene

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Embodiment 1

[0032] The method for synthesizing graphene based on an organic negative hydrogen donor under light or heating conditions comprises the following steps:

[0033] 1) Expansion treatment of graphite.

[0034] Heat 9mL of concentrated sulfuric acid to 80°C, add 1.6g of potassium peroxodisulfate and 1.6g of phosphorus pentoxide, stir at this temperature to completely dissolve the solid, then slowly add 2g of 325 mesh flake graphite, and finish adding within 5 minutes; The mixed solution was reacted at 80°C for 4.5h, cooled to room temperature after the reaction was completed, then added 350mL deionized water, left for 12 hours, filtered the mixture through a 0.2um filter membrane, and washed away the residual acid with a large amount of water; the solid Let stand at room temperature for 12 hours.

[0035] 2) Oxidation of expanded graphite

[0036] Take 80mL of concentrated sulfuric acid and place it in an ice bath at 0°C, add the expanded graphite obtained in step 1) to the sulf...

Embodiment 2

[0042]Repeat Example 1, its difference is only: in step 3), the concentration of described graphene oxide is 0.3mg / mL; In step 4), described 1,4-dihydropyridine is 30mg, The light wavelength λ>400nm, the light reaction time is 3h, and the light-proof heating reaction time is 5h.

Embodiment 3

[0044] Repeat Example 1, its difference is only: in step 3) in, the concentration of described graphene oxide is 0.6mg / mL, in step 4) in described 1,4-dihydropyridine is 30mg, light The wavelength λ>400nm, the light reaction time is 3h, and the light-proof heating reaction time is 5h.

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Abstract

The invention discloses a method for synthesizing graphene, belonging to the technical field of materials and relating to synthesis for the graphene by photochemistry and hot chemistry solution methods based on an organic negative hydrogen donor as a reducing agent. The method comprises the following steps: pre-treating graphite; oxidizing the graphite; stripping the oxidized graphite to form graphene oxide; and reducing the grapheme oxide by the organic negative hydrogen donor under the conditions of heating or illuminating. In the method, the organic reducing agent such as organic negative hydrogen donor is used, and the illuminating or heating method is adopted under the condition of no any stabilizer, thus a large amount of single-layer graphene is obtained in a short reaction time, and simultaneously, the clean graphene can be obtained by using a simple extraction treatment method.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a method for synthesizing graphene based on an organic negative hydrogen donor under light or heating conditions. Background technique [0002] Graphene is made of sp 2 The two-dimensional network structure composed of carbon has excellent electrical, mechanical and thermal properties. Since its first discovery in 2004, graphene's unique structure, very high surface area and excellent electron transport properties have attracted widespread attention from scientists. It has a very wide application prospect and has become one of the most popular materials at present. In order to take advantage of these excellent properties of graphene, it is very important to develop a method for preparing graphene with high yield, because graphene's hydrophobicity and easy aggregation in solution have become the main obstacles to the preparation of graphene. In order to overcome these dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y40/00
Inventor 吴骊珠张慧慧刘强
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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