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Method for preparing graphene by continuously bombarding through electron beams

An electron beam and graphene technology, which is applied in the field of graphene material preparation, can solve the problems of graphene performance degradation and other problems, and achieve the effect of overcoming lattice damage, high quality, and avoiding lattice damage

Active Publication Date: 2017-09-01
李纲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the graphene prepared by these methods inevitably introduces impurity elements or impurity functional groups, thereby reducing the performance of the prepared graphene.
Therefore, there is currently no method for preparing graphene by continuous bombardment with electron beams.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put the flake graphite raw material with a particle size of 10 microns into the continuous screw extruder, set the temperature of the continuous screw reaction extruder to 60°C, and the extrusion pressure to 25 MPa to obtain a finer solid product as graphite fine powder, which is washed and crushed into graphite powder , put the graphite powder into the HF solution with a concentration of 3.5%, ultrasonication for 0.8 minutes, remove impurities on the graphite surface, and finally rinse with deionized water to remove the residual HF liquid, dry the graphite powder raw material under the protection of argon at 80 °C, and heat Pressing and sintering technology hot-presses graphite powder at 900°C and 2.3MPa pressure to obtain a 30*30 cm 2 The large-area graphite plate is pressed into a large-area graphite plate;

[0031] Using LiB 6 Excited electrons are generated, and after 100KV high-voltage acceleration, electron beams are obtained. In the direction in the plane of th...

Embodiment 2

[0034] Put the graphite oxide raw material with a particle size of 0.5 microns into the continuous screw extruder, set the temperature of the continuous screw reaction extruder to 150°C, and the extrusion pressure to 40 MPa to obtain a finer solid product as graphite fine powder, which is washed and crushed into graphite powder , put the graphite powder into the 5% HF solution, ultrasonically for 0.5 minutes to remove impurities on the graphite surface, and finally rinse with deionized water to remove the residual HF liquid, dry the graphite powder raw material under the protection of argon at 85°C, and heat Pressing and sintering technology hot presses graphite powder at 920°C and 3.3MPa to obtain a 50*50 cm 2 The large-area graphite plate is pressed into a large-area graphite plate;

[0035] Using LiB 6 Excited electrons are generated, and after 300KV high-voltage acceleration, electron beams are obtained. In the direction in the plane of the graphite plate, along the side of...

Embodiment 3

[0038] Put the raw material of expanded graphite with a particle size of 2 microns into the continuous screw extruder, set the temperature of the continuous screw reaction extruder to 250°C, and the extrusion pressure to 30 MPa to obtain a finer solid product as graphite fine powder, which is washed and crushed into graphite powder , put the graphite powder into the HF solution with a concentration of 4.5%, ultrasonically for 0.5 minutes to remove impurities on the graphite surface, and finally rinse with deionized water to remove the residual HF liquid, dry the raw graphite powder under the protection of argon at 88°C, and heat Pressing and sintering technology hot presses graphite powder at 980°C and 4.0MPa pressure to obtain a 40*40 cm 2 The large-area graphite plate is pressed into a large-area graphite plate;

[0039] Using LiB 6 Excited electrons are generated, and after 250KV high-voltage acceleration, electron beams are obtained. In the direction in the plane of the g...

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Abstract

The invention relates to the field of preparation of graphene materials and provides a method for preparing graphene by continuously bombarding through electron beams. The method comprises the following steps: firstly, prefabricating graphite into a large-area graphite plate; continuously bombarding the graphite plate by utilizing accelerated electron beams in a scanning manner; meanwhile, stably blowing the graphite plate by micro-airflow; bombarding the graphite plate through the electron beams to enable the graphite to obtain energy to enter a high energy state, so as to break an inter-laminar hydrogen bond; blowing by the micro-airflow and eroding the graphite to form the graphene. According to the method provided by the invention, the problem in the prior art that a mechanical force cannot be controlled so that crystal lattices of the graphene are broken is solved; the prepared graphene has high quality; the graphene is realized in a large-scale, low-cost and clean manner; furthermore, the industrialized development of the graphene is promoted.

Description

technical field [0001] The invention relates to the field of graphene material preparation, in particular to a method for preparing graphene by continuous bombardment of electron beams. Background technique [0002] Carbon exists widely in nature, and its unique properties and diverse forms are gradually discovered with the progress of human civilization. There are many allotropes of carbon, the most well-known ones are sp2 hybridized graphite and sp3 hybridized diamond. The discovery of Fullerene in 1985 and the discovery of carbon nanotubes in 1991 expanded the scope of carbon allotropes. In 2004, another allotrope of carbon with an ideal two-dimensional structure and peculiar electrical properties—graphene was successfully prepared, which triggered a new wave of research on carbonaceous materials. [0003] Graphene is a two-dimensional carbon nanomaterial composed of a layer of carbon atoms. It is the thinnest two-dimensional material known so far. Its thickness is only...

Claims

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Application Information

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IPC IPC(8): C01B32/19C01B32/192
CPCC01B2204/02C01B2204/04
Inventor 陈庆王镭迪曾军堂
Owner 李纲
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