Method for preparing graphene by taking carbon nanotubes with discontinuous tube walls as raw materials

Abstract

The invention discloses a method for preparing graphene by taking carbon nanotubes with discontinuous tube walls as raw materials. The method comprises the following steps: obtaining oxidized graphene by taking the carbon nanotubes with the discontinuous tube walls as the raw materials via a strong oxidant expansion and separation method; and carrying out a reduction treatment on the oxidized graphene so as to obtain the graphene, wherein the carbon nanotubes with the discontinuous tube walls are shaped like bamboo joints or fishbones; a strong oxidant is a mixture of inorganic acid and potassium permanganate. The method has the advantages that graphite layers for forming the tube walls of the carbon tubes are continuous by taking the carbon tubes with the discontinuous tube walls as the raw materials; the sizes of the carbon tubes are in a nanometer level, so that the oxidation expansion distance of the strong oxidant entering the carbon tubes in a diffusion manner is short and the required time is less, namely, the efficient preparation of the graphene is realized, thereby being favorable for the large-scale preparation of the graphene.

Description

[0001] This patent application is funded by the key funding project (13JCZDJC33900) of the Tianjin Applied Basic and Frontier Technology Research Program (Natural Science Foundation) and the general project of the National Natural Science Foundation of China (51272176). technical field [0002] The invention relates to a method for preparing graphene by using discontinuous tube wall carbon nanotubes as raw materials, and belongs to the technical field of graphene preparation. Background technique [0003] Graphene has excellent electrical, mechanical and other functional properties, and can be used in high-performance composite materials, supercapacitors and batteries. At present, the preparation methods of graphene can be divided into two types according to the process: top-down and bottom-up. From top to bottom, a strong oxidant is mainly used to expand and separate graphite to obtain graphene oxide, and then reduce it to obtain graphene. Bottom-up is to use carbon-contai...

AI Technical Summary

Problems solved by technology

[0006] Although there have been reports of preparing graphene strips from carbon tubes before, they are processing carbon tubes with continuous tube walls, which is different from that of the present application.

And because the tube wall of the continuous carbon tube is a complete graphite structure, it is difficult to open, the process of opening is complicated, the consumption time is long, and the efficiency is low

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