Preparation method of carbon nanometer tube-graphene composite material

Abstract

The invention discloses a preparation method of a carbon nanometer tube-graphene composite material, and the method comprises the following steps of: directly mixing uniformly dispersed carbon nanometer tubes and a catalyst for graphene uniformly, causing the graphene to grow in situ in a carbon nanometer tube network by means of chemical vapor deposition, and removing the catalyst for the graphene after purification treatment to obtain the carbon nanometer tube-graphene composite material. The carbon nanometer tube-graphene composite material gives consideration to the characteristics of both the carbon nanometer tube and the graphene, and has significant application values in the aspects such as electrochemical energy storage, catalyst preparation, a transparent electroconductive film, enhancement, electric conduction, and an adsorption material as well as a desorption material, and in addition the preparation method is simple in operation, low in cost and easy for industrial production and is an important preparation method of a nanometer carbon material.

Description

technical field [0001] The invention relates to a method for preparing a carbon nanotube-graphene composite material, which belongs to the field of preparation and application of nanocomposite materials. Background technique [0002] Carbon nanocomposites have a wide range of applications, especially in the fields of electrochemical energy storage, catalyst preparation, transparent conductive films, conductive materials, reinforcing materials, adsorption and desorption materials, etc. Among them, carbon nanotubes and graphene in carbon nanomaterials have extremely excellent characteristics. Carbon nanotubes have a high aspect ratio, good electrical conductivity and mechanical strength, while graphene has a large specific surface area, as well as excellent electrical conductivity and mechanical properties, and can combine the characteristics of these two carbon nanomaterials to design a more Ideal carbon nanocomposites have extremely important value and significance. [000...

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Problems solved by technology

[0003] At present, the method of preparing composite materials that take into account the characteristics of carbon nanotubes and graphene basically adopts the method of physical mixing (Nano Lett.9, 1949-55, 2009), and the basic process is to combine the precursors of carbon nanotubes and graphene— Graphite oxide is simply mechanically mixed in the solution, and then the graphite oxide is reduced to become a hybrid composite material of carbon nanotubes and reduced graphene. However, in such composite materials, the relationship between carbon nanotubes and graphene only depends on physical bonding It is difficult to form a good interfacial contact, so the synergistic performance of carbon nanotubes and graphene is greatly reduced

Using the method of in-situ growth, the catalyst of carbon nanotubes can be loaded on the graphite oxide sheet for in-situ growth, and after further reduction, the composite material of carbon nanotubes-graphene can also be prepared (Adv.Mater.22, 3723-3728, 2010), however, there are many defects in the growth of carbon nanotubes on graphite oxide sheets, the growth is limited, and the preparation of related supported catalysts is also difficult to control, which also makes the prepared carbon nanotubes-graphene composites Limited performance and practical application space

In addition, by directly preparing a mixed catalyst of carbon nanotubes and graphene, and then using the method of in-situ growth, a composite material of carbon nanotubes-graphene can also be grown (application number: CN201210141649.6), but the method prepared The growth of carbon nanotubes is still limited, and there are many defects in graphene. In order to achieve real applications, the uniformity of materials and the control of process costs need to be strengthened.

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