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Method for surface modification of carbon material

A technology of surface modification and carbon materials, which is applied in the field of carbon materials, can solve the problems of short stable storage time of carbon material solutions, high price of amphoteric surfactants, prolonging the storage time of carbon material solutions, etc., and achieve safety, environmental protection and large-scale production , good dispersion effect, good large-scale application prospect effect

Active Publication Date: 2015-03-25
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
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Problems solved by technology

[0004] Among many structure-directing agents, anionic and cationic surfactants are commonly used, such as cetyltrimethylammonium bromide, sodium dodecylbenzenesulfonate, etc., although they have certain effects on the precursor of carbon materials. However, the stable storage time of the dispersed carbon material solution is shorter than that of other structure-directing agents; amphoteric surfactants such as chitosan cannot meet the requirements of industrial applications due to their high price, and have not been widely used.
However, the application of new surfactants in the surface modification of carbon materials needs to be further studied, especially the low price, safety and non-toxicity, and can largely modify the surface of carbon materials to solve their long-term dispersion and prolong the carbon life. Surfactants for the storage time of the material solution have not yet been reported in the relevant work

Method used

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  • Method for surface modification of carbon material
  • Method for surface modification of carbon material
  • Method for surface modification of carbon material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Mix 200 mg of unmodified carbon nanotubes and 200 mg of sucrose (the mass ratio of carbon nanotubes and sucrose is 1:1), then disperse the mixture in 40 mL of aqueous solution, and continue stirring until the sucrose is uniformly dissolved to obtain a solid-liquid mixture. Then transfer the solid-liquid mixture to a hydrothermal reaction kettle, and conduct a constant temperature hydrothermal reaction at 100°C for 24 hours. After the hydrothermal reaction is completed, naturally cool to obtain the modified carbon nanotube crude product, which is centrifuged at 10000rpm Centrifuge under the condition of rotating speed, collect the solid matter, and then wash with deionized water and absolute ethanol three times respectively to remove the residual reactants contained in the solid matter. After the washing is completed, dry the solid matter in an oven to obtain the improved Pure functionalized carbon nanotubes. Compared with untreated carbon nanotubes ( figure 1 ) and car...

Embodiment 2

[0032] Mix 200 mg of unmodified carbon nanotubes and 2000 mg of sucrose (the mass ratio of carbon nanotubes and sucrose is 1:10), then disperse the mixture in 100 mL of aqueous solution, and continue stirring until the sucrose is uniformly dissolved to obtain a solid-liquid mixture. Then transfer the solid-liquid mixture to a hydrothermal reaction kettle, and conduct a constant temperature hydrothermal reaction at 120° C. for 18 hours. After the hydrothermal reaction is completed, naturally cool to obtain the modified carbon nanotube crude product, which is centrifuged at 9000 rpm Centrifuge under the condition of rotating speed, collect the solid matter, and then wash with deionized water and absolute ethanol three times respectively to remove the residual reactants contained in the solid matter. After the washing is completed, dry the solid matter in an oven to obtain the improved Pure functionalized carbon nanotubes. At the same time from Figure 4 It can be seen from the ...

Embodiment 3

[0034]Mix 200 mg of unmodified carbon nanotubes and 4000 mg of sucrose (the mass ratio of carbon nanotubes and sucrose is 1:20), then disperse the mixture in 40 mL of aqueous solution, and continue stirring until the sucrose is uniformly dissolved to obtain a solid-liquid mixture. Then transfer the solid-liquid mixture to a hydrothermal reaction kettle, and conduct a constant temperature hydrothermal reaction at 140°C for 12 hours. After the hydrothermal reaction is completed, naturally cool to obtain the modified carbon nanotube crude product, which is centrifuged at 5000rpm Centrifuge under the condition of rotating speed, collect the solid matter, and then wash with deionized water and absolute ethanol three times respectively to remove the residual reactants contained in the solid matter. After the washing is completed, dry the solid matter in an oven to obtain the improved Pure functionalized carbon nanotubes. At the same time from Figure 4 It can be seen from the infra...

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Abstract

The invention discloses a method for surface modification of a carbon material. By adopting a safe, low-cost, non-toxic environment-friendly structure-directing agent and a one-pot hydrothermal method, functionalized radicals are simply and efficiently introduced into surfaces of carbon nanotubes and graphene so that the surface of the carbon material is significantly modified, the structure stability of the carbon material is maintained to the greatest extent, the dispersion of the carbon material in a solution is improved, the carbon material has good dispersing effect in the process that a dispersion liquid is maintained for a long time and thus the carbon nanotubes and graphene can be uniformly dispersed and stably exist in different matrix materials and the mechanical property, electrical conductivity and the like of a composite material can be significantly improved. Compared with the prior art, the method disclosed by the invention has the advantages that environmental friendliness is achieved, large-scale production can also be achieved and no highly toxic waste is produced and the method is simple, efficient and safe and, thus being a very promising and efficient modification method of carbon material.

Description

technical field [0001] Embodiments of the present invention relate to the field of carbon materials, and more specifically, embodiments of the present invention relate to a method for surface modification of widely used carbon materials including carbon nanotubes (CNTs) and graphene. Background technique [0002] In 1991, Dr. Iijima of Japan Electronics Corporation (NEC) discovered a peculiar carbon structure-carbon nanotube (CNT), which has a high aspect ratio and a unique quasi-one-dimensional tubular structure on the nanometer scale. Carbon nanotubes have very superior mechanical, electrical, thermal and chemical properties, and have great potential application value in the field of future science and technology. Therefore, after the discovery of carbon nanotubes, they quickly became a research hotspot in the fields of physics, chemistry and material science. Carbon atoms in carbon nanotubes are represented by sp 2 Hybridization is dominant, while the hexagonal grid stru...

Claims

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Application Information

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IPC IPC(8): C01B31/00
Inventor 程建丽王斌
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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