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Method for preparing graphene

A graphene and calcination technology, applied in the field of carbon materials, can solve the problems of uncontrollable three-dimensional structure and limit the application of graphene

Active Publication Date: 2015-05-06
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the catalytic activation method does not use strong acids and strong oxidants, it has less environmental pollution. However, the three-dimensional structure of graphene prepared by the existing catalytic activation method is uncontrollable, which limits the application of graphene.

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preparation example Construction

[0032] The invention provides a kind of preparation method of graphene, comprises the following steps:

[0033] A) carrying out a hydrothermal reaction in water with a surfactant, a carbon source and a metal catalyst to obtain an intermediate with a three-dimensional nanostructure;

[0034] B) calcining the intermediate with a three-dimensional nanostructure obtained in step A) under a protective gas atmosphere to obtain graphene.

[0035] The preparation method provided by the invention can control the three-dimensional structure of graphene, thereby realizing the controllable preparation of graphene.

[0036] In the present invention, a surfactant, a carbon source and a metal catalyst are subjected to a hydrothermal reaction in water to obtain an intermediate having a three-dimensional nanostructure. In the present invention, the surfactant, a carbon source and a metal catalyst are preferably mixed with water to obtain a mixed solution, and then The mixed solution is subjec...

Embodiment 1

[0048] Mix 20g of nickel acetate, 10g of glucose, 1g of sodium lauryl sulfate with 150ml of water, adjust the pH of the solution to 10.5 with ammonia water with a mass concentration of 25%, and conduct a hydrothermal reaction at 180°C for 24 hours to form a petal-shaped intermediate;

[0049] Then the intermediate was calcined at 850°C for 5 hours under a nitrogen atmosphere, and the heating rate was 5°C / min. The calcined product was washed with hydrochloric acid with a concentration of 1mol / L, filtered, and dried at 120°C to obtain graphene.

[0050] The present invention has carried out scanning electron microscope detection (SEM) to the three-dimensional nanostructure compound obtained in the present embodiment, the result is as follows figure 1 as shown, figure 1 It is the SEM picture of the petal-shaped intermediate obtained in Example 1 of the present invention;

[0051] The present invention has carried out scanning electron microscope detection (SEM) to the graphene t...

Embodiment 2

[0055] Mix 10g of nickel chloride, 10g of P123, 5g of sodium lauryl sulfate with 200ml of water, and stir evenly in a water bath at 28°C; use ammonia water with a mass concentration of 25% to adjust the pH of the solution to 11, and conduct a hydrothermal reaction at 180°C for 6 hours to form Intermediates in the shape of petals.

[0056] Take 1g of the above-mentioned intermediate and mix it with 0.2g KOH and dry it. Then, the dried product is calcined at 1000°C for 2h under a nitrogen atmosphere, and the heating rate is 5°C / min. The calcined product is successively washed with hydrochloric acid with a concentration of 1mol / L. Filter and dry at 120°C to obtain porous graphene.

[0057] The present invention has carried out scanning electron microscope detection (SEM) to the intermediate of the petal shape that present embodiment obtains, and the result is as follows Figure 5 as shown, Figure 5 It is the SEM picture of the petal-shaped intermediate obtained in Example 2 of...

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Abstract

The invention provides a method for preparing graphene. The method comprises the following steps: (A) carrying out a hydrothermal reaction on a surfactant, a carbon source and a metal catalyst in water to obtain an intermediate with a three-dimensional nano-structure; and (B) calacining the intermediate with the three-dimensional nano-structure obtained in the step (A) under a protective gas atmosphere to obtain graphene. According to the method, the product of a metal catalyst hydrothermal reaction has a three-dimensional nano-structure, is used as a template, and is uniformly mixed with the carbon source and the surfactant; by utilizing the amphipathy of the surfactant, the hydrophobic end of the surfactant is adsorbed on the hydrophobic part of the carbon source, and the hydrophilic end is adsorbed on the surface of the metal catalyst hydrothermal product, so that the carbon source can be uniformly distributed on the surface of the hydrothermal reaction product; the hydrothermal reaction product of the metal catalyst can be used as a structure support, and the aim of controlling the graphene structure is achieved by controlling the structure of the metal catalyst hydrothermal product.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, in particular to a method for preparing graphene. Background technique [0002] Graphene is the thinnest two-dimensional material in the world. Its thickness is only 1 / 200,000th that of a hair, but its strength is the highest among known materials, 100 times higher than the best steel. The force required to cross-section a single layer of graphene is 200 times that of steel. The study found that 100nm graphene can withstand a maximum pressure of about 2.9 micronewtons, which is equivalent to applying a pressure of 55 newtons to break a 1m-long graphene. If a graphene film with a thickness of 100nm is made, it can withstand a pressure of about 20,000 Newtons, so a packaging bag made of graphene can carry items weighing about two tons, which fully demonstrates that graphene is the strongest material in the world . [0003] In recent years, people continue to explore new methods to incre...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 吕彬彬刘兆平周旭峰郑超王国华沈鲁恺姜萍
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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