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Graphene and preparation method thereof

A technology of graphene and nitrogen-doped graphene, which is applied in the field of nitrogen-doped graphene and its preparation, can solve the problems of large discharge current, high risk, high hydrogen pressure, etc., and achieve low production cost, simple equipment, and improved safety effect

Inactive Publication Date: 2010-06-02
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using this method to prepare graphene requires high hydrogen pressure and large discharge current, which is highly dangerous

Method used

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  • Graphene and preparation method thereof
  • Graphene and preparation method thereof
  • Graphene and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Graphene is prepared in an electric arc furnace, and the furnace wall of the electric arc furnace is cooled with circulating water. Spectrally pure graphite rods are used as the cathode and anode of the electric arc furnace respectively, and the diameter of the graphite rods at both poles is 8 mm. Under the conditions of a mixture of helium and ammonia (volume ratio 1:1) at a pressure of 760 Torr and a current of 120 A, DC arc discharge is carried out. After the anode was consumed, the product was collected and burned in air at 450°C for 1 hour to obtain nitrogen atom-doped graphene. The scanning electron micrograph of the graphene, as figure 1 shown. From figure 1 The protruding edges of graphene can be seen in the figure, indicating that flake graphene is produced; figure 2 It is a transmission electron micrograph of the graphene, and the size of the graphene sheet is between 100-200 nanometers; image 3 It is a high-resolution transmission electron microscope p...

Embodiment 2

[0032] Graphene is prepared in an electric arc furnace, and the furnace wall of the electric arc furnace is cooled with circulating water. Spectrally pure graphite rods are used as the cathode and anode of the electric arc furnace respectively, and the diameter of the graphite rods at both poles is 8 mm. Under the conditions of a mixture of helium and ammonia (volume ratio 1:2) at a pressure of 760 Torr and a current of 120 A, direct current arc discharge is carried out. After the anode was consumed, the product was collected and burned in air at 450°C for 1 hour to obtain nitrogen atom-doped graphene.

Embodiment 3

[0034] Graphene is prepared in an electric arc furnace, and the furnace wall of the electric arc furnace is cooled with circulating water. Spectrally pure graphite rods are used as the cathode and anode of the electric arc furnace respectively, and the diameter of the graphite rods at both poles is 8 mm. Under the conditions of a mixture of helium and ammonia (volume ratio 1:3) at a pressure of 380 Torr and a current of 80 A, DC arc discharge is performed. After the anode was consumed, the product was collected and burned in air at 500°C for 1 hour to obtain nitrogen atom-doped graphene.

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Abstract

The invention provides a graphene and a preparation method thereof, belonging to the technical field of grapheme synthesis. Nitrogen-doped grapheme can be prepared by using a direct current electric arc method and taking mixed gas of ammonia gas and helium gas as reaction atmosphere. The nitrogen-doped grapheme with high yield can be prepared by adopting the preparation method of the grapheme under low pressure and low current and has high production safety. The purity of the prepared grapheme is over 97 percent; by the characterization of a transmission electron microscope, the layer number of the prepared grapheme is between 2 and 6, the size of grapheme sheets is between 100 and 200 nanometers and the interlayer spacing is about 0.4 nanometer. The produced nitrogen-doped grapheme has favorable application prospect in catalyst carriers, lithium ion batteries, conductive thin films and other aspects.

Description

technical field [0001] The invention relates to a synthesis technology of graphene, in particular to a nitrogen-doped graphene and a preparation method thereof. Background technique [0002] Graphene is a new allotrope of carbon discovered in recent years. It is a two-dimensional structure composed of carbon atoms arranged in a hexagonal grid. Single-layer graphene consisting of only one layer of carbon atoms has excellent electrical and mechanical properties (Science, 2004, 306, 666-669; Science, 2008, 321, 385-388), and is widely used in nanoelectronic devices, photoelectric conversion and batteries. Materials and other fields have broad application prospects. In addition to single-layer graphene, bilayer and multilayer graphene also have unique physical and chemical properties (Journal of Materials Chemistry, 2009, 19, 2457-2469). Therefore, the synthesis and properties of graphene have become a hot spot in nanoscience research in recent years. [0003] The synthesis m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 施祖进王志永李楠顾镇南
Owner PEKING UNIV
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