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A method for preparing carbon nanovolumes in large quantities from graphene

A technology of carbon nanorolls and graphene, applied in the direction of nanotechnology, can solve the problems of less preparation, low sample purity, complicated operation, etc., and achieve the effect of short preparation cycle, simple process and macro preparation

Active Publication Date: 2016-09-21
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although there are currently some reports on the preparation of carbon nanoscrolls, such as carbon nanoscrolls prepared by intercalation of graphite with ultrasound (Science2003, 299, 1361), graphene is in Curling under the influence of organic solvents (Nano. Lett.2009, 9, 2565) and microwave-assisted preparation of carbon nanoscrolls in liquid nitrogen (Adv. Mater.2011, 23, 2460), but these methods are more complicated to operate, the amount of preparation is less, and the purity of the prepared samples is not high

Method used

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  • A method for preparing carbon nanovolumes in large quantities from graphene
  • A method for preparing carbon nanovolumes in large quantities from graphene
  • A method for preparing carbon nanovolumes in large quantities from graphene

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Embodiment 1

[0027] Graphite oxide was prepared by the modified Hummers method using 32 mesh natural flake graphite. Graphite oxide was prepared from flake graphite at an oxidation temperature of 35 °C and an oxidation time of 2 h. The graphite oxide was dispersed in water, the ultrasonic time was 10 min, and the ultrasonic power was 600 W, and then the visible particles were removed by centrifugation at 3000 rpm. particles to obtain a graphene oxide solution.

[0028] The graphene oxide solution with a concentration of 1 mg / ml was heated to 100 °C and placed in a test tube, then quenched in liquid nitrogen until the solution was completely frozen, and then freeze-dried in situ. After drying, the oxidized carbon nanoscrolls were obtained, which were then reduced at 500 °C under the protection of Ar gas to obtain carbon nanoscrolls.

[0029] Electron microscope observation results show that: under such conditions, more than 80% of the graphene sheets curl up to form carbon nanovolumes.

Embodiment 2

[0031] The preparation method of graphene oxide solution is the same as embodiment 1.

[0032] The graphene oxide solution with a concentration of 1 mg / ml was heated to 60 °C and placed in a test tube, then quenched in liquid nitrogen until the solution was completely frozen, and then freeze-dried in situ. After drying, the oxidized carbon nanoscrolls were obtained, which were then reduced at 500 °C under the protection of Ar gas to obtain carbon nanoscrolls.

[0033] Electron microscope observation results show that: under such conditions, more than 70% of the graphene sheets curl up to form carbon nanovolumes.

Embodiment 3

[0035] The preparation method of graphene oxide solution is the same as embodiment 1.

[0036] The graphene oxide solution with a concentration of 6 mg / ml was heated to 100 °C and placed in a test tube, then quenched in liquid nitrogen until the solution was completely frozen, and then freeze-dried in situ. After drying, the oxidized carbon nanoscrolls were obtained, which were then reduced at 500 °C under the protection of Ar gas to obtain carbon nanoscrolls.

[0037] Electron microscope observation results show that: under such conditions, more than 80% of the graphene sheets curl up to form carbon nanovolumes.

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Abstract

The invention discloses a method for preparing carbon nanovolumes from graphene in large quantities. The method uses large-size natural flake graphite as a raw material to prepare a large-size graphene oxide solution, heats the graphene oxide solution or the graphene oxide solution added with an anionic surfactant, and then quenches it in liquid nitrogen to prepare a graphene oxide solution. carbon nanoscrolls, and finally reduce the oxidized carbon nanoscrolls by heating or chemical reduction to prepare carbon nanoscrolls. The invention has the advantages of simple process, short preparation period, low cost and high quality of carbon nano-rolls, and is expected to realize the macro-preparation of carbon nano-rolls.

Description

technical field [0001] The invention relates to a preparation technology of carbon nano-rolls, in particular to a method for preparing carbon nano-rolls by cold-quenching a graphene oxide solution in a liquid nitrogen environment, which is suitable for the macro-scale preparation of carbon nano-rolls. Background technique [0002] Carbon nanoscrolls are a structure similar to one-dimensional carbon nanotubes rolled by two-dimensional graphene of different thicknesses. In recent years, carbon nanoscrolls, as a new type of carbon material, have gradually attracted the attention of scientific researchers. This is mainly due to the fact that in addition to some excellent properties of graphene and carbon nanotubes (such as high electron mobility and high mechanical strength), carbon nanoscrolls also have some new properties different from graphene and carbon nanotubes. Theoretical calculations show that carbon nanoscrolls will have unusual electronic and optical properties, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04B82Y40/00
Inventor 阎兴斌赵金平薛群基
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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