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Preparation method of nitrogen-doped graphene quantum dots

A technology of graphene quantum dots and nitrogen-doped graphene, which is applied in the field of preparation of nitrogen-doped graphene quantum dots, and achieves the effect of simple process

Active Publication Date: 2017-01-04
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have various disadvantages in terms of preparation efficiency and process requirements.

Method used

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  • Preparation method of nitrogen-doped graphene quantum dots

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Effect test

Embodiment 1

[0031] Weigh 5.0g of trinitrotriaminobenzene (TATB) and add 40.0g of concentrated sulfuric acid (H 2 SO 4 ), stirred for 30 minutes to dissolve. The dissolved solution was transferred to a 200ml reactor, and placed in a high-temperature oven at 150°C for 1 hour. After the reaction is completed, freeze and open the reaction kettle, add 100mL of distilled water, and then pour it into a dialysis bag for dialysis for 2-3 days to remove concentrated sulfuric acid, so that the pH of the solution is 6-7, and obtain light yellow water-soluble nitrogen-doped graphene. The aqueous solution was freeze-dried for 5 days to obtain black nitrogen-doped graphene powder, the morphology of which is shown in figure 1 shown.

Embodiment 2

[0033] Weigh 5.0g of trinitrotriaminobenzene (TATB) and add 40.0g of concentrated sulfuric acid (H 2 SO 4 ), stirred for 30 minutes to dissolve. The dissolved solution was transferred to a 500ml reactor, and placed in a high-temperature oven at 280°C for 1 hour. After the reaction is completed, freeze and open the reactor, add 300mL of distilled water, and pour into a dialysis bag for dialysis for 2-3 days to remove concentrated sulfuric acid, so that the pH of the solution is 6-7, and obtain light yellow water-soluble nitrogen-doped graphene. The aqueous solution was freeze-dried for 5 days to obtain black nitrogen-doped graphene powder, the morphology of which is shown in figure 2 shown.

Embodiment 3

[0035] Weigh 5.0g of trinitrotriaminobenzene (TATB) and add 60.0g of concentrated sulfuric acid (H 2 SO 4 ), stirred for 30 minutes to dissolve. The dissolved solution was transferred to a 500ml reactor, and placed in a high-temperature oven at 200°C for 4 hours. After the reaction is completed, freeze and open the reaction kettle, add 300mL of distilled water, and then pour it into a dialysis bag for dialysis for 2-3 days to remove concentrated sulfuric acid, so that the pH of the solution is 6-7, and obtain light yellow water-soluble nitrogen-doped graphene. The aqueous solution was freeze-dried for 5 days to obtain black nitrogen-doped graphene powder, the morphology of which is shown in image 3 shown.

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Abstract

The invention discloses a preparation method of nitrogen-doped graphene quantum dots. According to the method, TATB serves as a precursor of a carbon source and a nitrogen source, TATB is dissolved in a concentrated sulfuric acid solvent, heating is carried out for 0.5-7 hours at certain temperature, TATB is subjected to a condensation reaction to generate nitrogen-doped graphene, water is added after the reaction is completed and cooling is completed, the material is transferred into a dialysis bag for dialysis for 2-3 days, concentrated sulfuric acid is removed, the PH value of the solution is equal to 6 to 7, water-soluble nitrogen-doped graphene is obtained, and nitrogen-doped graphene solid powder is obtained after the water-soluble nitrogen-doped graphene continues to be subjected to freeze drying. TATB serves as the raw material, the nitrogen-doped graphene or quantum dots are prepared through the one-step method, the preparation process is simple and efficient, and batched preparation can be achieved. The prepared nitrogen-doped graphene has good water solubility, and the nitrogen-doped graphene or the nitrogen-doped graphene quantum dots with the adjustable morphology and molecular weight can be obtained by controlling the preparation process.

Description

technical field [0001] The invention belongs to the technical field of graphene materials, in particular to a method for preparing nitrogen-doped graphene quantum dots. Background technique [0002] As a new type of carbon material with planar crystal structure, graphene has excellent properties such as high theoretical specific surface area, unique electronic structure and electrical properties, high thermal conductivity and high mechanical strength, and is widely used in catalysis, hydrogen storage, composite materials and Electrochemical capacitors and other fields have potential application prospects. However, since graphene has no energy band gap, its electrical conductivity cannot be completely controlled like a semiconductor, and the surface of graphene is smooth and inert, which is not conducive to the combination with other functional materials, which limits the further application of graphene. Nitrogen-doped graphene is prepared by modifying graphene with nitrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01P2004/62
Inventor 王军谯志强吴鹏王彦群杨光成
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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