TWI411574B - Carbon nanotube composite material and method for making the same - Google Patents

Abstract

The present invention relates to a carbon nanotube composite material. The carbon nanotube composite material includes a plurality of carbon nanotubes and nano particles. The carbon nanotubes form a carbon nanotube structure. The nano particles are dispersed in the carbon nanotube structure uniformly. The present invention also relates to a method for making the carbon nanotube composite material. The method includes the following steps: forming a carbon nanotube structure; providing a prefabrication of nano particles; compositing the prefabrication with the carbon nanotube structure, and then making the nano particles dispersed in the carbon nanotube structure.

Description

Nano carbon tube composite material and preparation method thereof

The invention relates to a nano composite material and a preparation method thereof, in particular to a carbon nanotube composite material based on a carbon nanotube and a preparation method thereof.

Nano carbon tubes have excellent mechanical and optoelectronic properties and are considered to be ideal additives for composite materials. At present, carbon nanotubes have been able to form a variety of composite materials with other materials, such as polymer composites, ceramic composites, layered composites, doped composites and carbon/carbon composites. These composite materials have potential applications in reinforcing fibers, novel catalysts, and nanoelectronic devices, and have become hotspots in scientific research worldwide (Ajjayan PM, Stephan O., Colliex C., Tranth D. Science. 1994, 265, 1212). -1215: Calvert P., Nature, 1999, 399, 210-211).

At present, composite materials based on carbon nanotubes are mainly prepared by direct composite method and surface modification composite method. Among them, the direct composite method is to form a film of nano particles on the surface of the carbon nanotube by forming a nano particle on the surface of the carbon nanotube by a certain method such as coating or spraying. This method is relatively simple to operate. However, when the carbon nanotube composite material is prepared by this method, since the carbon nanotubes are mostly in the form of a carbon nanotube powder, the carbon nanotubes themselves are prone to agglomeration, so the preparation cannot be controlled. The distribution of nanomaterials in the carbon nanotube composite on the surface of the carbon nanotubes, the distribution of nanoparticles and carbon nanotubes in the composite is not uniform.

In order to solve the agglomeration problem of the carbon nanotubes, the surface of the carbon nanotubes is usually modified, and then the carbon nanotubes are combined with other nano particles. For nano The method of modifying the surface of the carbon tube is generally carried out by dispersing the carbon nanotubes in a strong oxidizing acid or a surfactant such as sulfuric acid or nitric acid. This method can solve the problem of agglomeration of the carbon nanotubes to some extent. Due to the strong acid treatment, the carbon nanotubes are damaged to a certain extent, and the use of surfactant treatment makes the surfactant difficult to remove in the final carbon nanotube composite, which greatly affects the Nai. The performance of carbon nanotube composites.

In addition, in the carbon nanotube composite material prepared by the above two methods, a carbon nanotube structure is not formed between the carbon nanotubes, so that the mechanical strength and toughness of the carbon nanotube composite material are poor, and the carbon nanotube composite material cannot be fully utilized. Good performance of carbon nanotubes.

In view of this, it is necessary to provide a composite material having a nano carbon tube as a matrix, having high mechanical strength and good toughness, and a preparation method thereof.

A carbon nanotube composite material comprising: a plurality of carbon nanotubes and a plurality of nano particles, wherein the plurality of carbon nanotubes form a carbon nanotube structure, and the nanoparticle is distributed in the nanosphere In the carbon tube structure.

A method for preparing a carbon nanotube composite material, comprising the steps of: preparing a carbon nanotube structure; providing a nanoparticle preform; and combining the carbon nanotube structure with the nanoparticle preform to form a nanoparticle In the carbon nanotube structure.

Compared with the prior art, the carbon nanotube composite material and the preparation method thereof have the following advantages: First, since the carbon nanotubes in the carbon nanotube composite material are connected to each other to form a carbon nanotube structure To make nanocarbon The tube composite has high mechanical strength and good toughness. Secondly, since the carbon nanotube structure is used as the skeleton, the carbon nanotube composite material has good electrical conductivity and fully exerts the conductivity of the carbon nanotube. Third, the preparation method of the carbon nanotube composite material does not need to treat the surface of the carbon nanotube, so it does not cause damage to the carbon nanotubes.

Hereinafter, the carbon nanotube composite material provided by the present technical solution will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1 , an embodiment of the present technical solution provides a carbon nanotube composite material 10 including a carbon nanotube structure 16 and a plurality of nano particles 18 . The carbon nanotube structure 16 includes a plurality of carbon nanotubes interconnected, and the nanoparticles 18 are uniformly attached to the surface of the carbon nanotubes. Further, the carbon nanotubes and nanoparticles 18 may be uniformly distributed in the carbon nanotube composite 10.

The carbon nanotube composite 10 further includes a plurality of micropores 20 which are gaps between the carbon nanotubes, a gap between the carbon nanotubes and the nanoparticles 18, or nanoparticles 18 The gap between them. The pores 20 have a pore diameter of from 0.3 nm to 5 mm. The micropores 20 in the carbon nanotube composite 10 provide the carbon nanotube composite 10 with a certain permeability and a high specific surface area.

The carbon nanotubes in the carbon nanotube structure 16 are ordered or disorderly arranged. Specifically, when the carbon nanotube structure includes a disordered arrangement of carbon nanotubes, the carbon nanotubes are intertwined or oriented. Isotropic arrangement; when the carbon nanotube structure includes an ordered arrangement of carbon nanotubes, the carbon nanotubes are arranged in a preferred orientation in one direction or in a plurality of directions. Nano carbon tubes attract each other and interact with each other Lap or wrap to form a shape-determined stabilizing structure. In the carbon nanotube composite 10, the carbon nanotube structure 16 acts as a skeleton for supporting the nanoparticles 18. The carbon nanotube structure 16 includes at least one layer of carbon nanotube film, the carbon nanotube film comprising a plurality of uniformly distributed carbon nanotubes, specifically, the plurality of uniformly distributed carbon nanotubes are ordered or absent Ordered, the carbon nanotubes are connected by Van der Waals force. The carbon nanotube film is a carbon nanotube film, a carbon nanotube film or a carbon nanotube film. Preferably, the carbon nanotube structure 16 is a self-supporting structure. Specifically, the self-supporting structure is divided into two cases: the carbon nanotube structure 16 does not require a substrate support at all, and can be completely independent and self-supporting; A portion of the carbon nanotube structure 16 requires one or a plurality of support points, and the remaining portion can be suspended and have a stable structure.

Referring to FIG. 2, the carbon nanotube flocculation membrane is isotropic, and includes a plurality of disordered and uniformly distributed carbon nanotubes. The carbon nanotubes are attracted and intertwined by Van der Waals forces. Therefore, the carbon nanotube flocculation membrane has good flexibility, can be bent and folded into any shape without cracking, and has good self-supporting property, and can be self-supported without substrate support. The carbon nanotube film has a thickness of from 1 micron to 2 mm.

The carbon nanotube rolled film comprises uniformly distributed carbon nanotubes, and the carbon nanotubes are arranged in a preferred orientation in the same direction or in different directions. The carbon nanotubes in the carbon nanotube rolled film form an angle α with the surface of the carbon nanotube rolled film, wherein α is greater than or equal to zero degrees and less than or equal to 15 degrees. Preferably, the carbon nanotubes in the carbon nanotube rolled film are parallel to the surface of the carbon nanotube film. The carbon nanotubes in the carbon nanotube rolled film have different arrangements depending on the manner of rolling. Specifically, the carbon nanotubes can each Arranged in the same direction; when rolling in different directions, the carbon nanotubes are arranged in different orientations. Referring to Figure 3, the carbon nanotubes can be arranged in a preferred orientation along a fixed direction in the carbon nanotube film. Referring to Figure 4, the carbon nanotubes in the carbon nanotube laminate can be arranged in different orientations. The carbon nanotubes in the carbon nanotube rolled film partially overlap. The carbon nanotubes in the carbon nanotube film are attracted to each other by van der Waals force, and the silicon carbon nanotubes have good flexibility and can be bent and folded into any shape. Does not break. And because the carbon nanotubes in the carbon nanotube film are attracted to each other through the van der Waals force, the carbon nanotube film is a self-supporting structure, which can be self-supported without substrate support. presence. The rolled film has a thickness of from 0.1 μm to 5 mm.

Referring to FIG. 5, the carbon nanotube film comprises a plurality of carbon nanotubes connected end to end and arranged in a preferred orientation along the stretching direction. The carbon nanotubes are evenly distributed and parallel to the surface of the carbon nanotube film. The carbon nanotubes in the carbon nanotube membrane are connected by van der Waals force. On the one hand, the end-to-end carbon nanotubes are connected by van der Waals force, and on the other hand, the parallel carbon nanotubes are also combined by van der Waals force, so the carbon nanotube film has a certain The flexibility is bendable into any shape without breaking. The carbon nanotube film has a thickness of from 0.5 nm to 100 μm.

The carbon nanotube structure 16 may further comprise at least two carbon nanotube membranes arranged in an overlapping manner. It can be understood that, since the carbon nanotube membranes in the carbon nanotube structure 16 can be overlapped, the thickness of the above-mentioned carbon nanotube structure 16 is not limited, and the carbon nanotube structure having an arbitrary thickness can be prepared according to actual needs. 16. When the carbon nanotube structure 16 includes a plurality of stacked carbon nanotube films, the arrangement of the carbon nanotubes in the adjacent carbon nanotube film is arranged. An angle β is formed, and β is greater than or equal to zero degrees and less than or equal to 90 degrees.

The carbon nanotubes include one or more of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube. Single-walled carbon nanotubes have a diameter of 0.5 nm to 50 nm, double-walled carbon nanotubes have a diameter of 1.0 nm to 50 nm, and multi-walled carbon nanotubes have a diameter of 1.5 nm to 50 nm. . The length of the carbon nanotubes is between 50 nm and 10 mm, preferably the length of the carbon nanotubes is between 200 microns and 900 microns.

The nanoparticle 18 can be attached to the surface of the carbon nanotube in the carbon nanotube structure 16. When the carbon nanotube structure 16 comprises a plurality of layers of carbon nanotube film, 18 nanoparticles can be filled adjacent to each other. Between the carbon nanotube membranes. Specifically, the nanoparticles 18 can independently maintain the high specific surface area of the nanoparticles 18; the nanoparticles 18 can also be in contact with each other.

The nanoparticles 18 include one or more of nanofibers, nanorods, nanospheres, and nanoparticles of various forms of nanowires. The nanoparticle 18 includes one or more of metal nanoparticle, non-metallic nanoparticle, alloy nanoparticle, metal oxide nanoparticle, and polymer nanoparticle. Specifically, the nanoparticle 18 can be copper nanoparticle, zinc nanoparticle, cobalt nanoparticle, carbon nanoparticle, diamond nanoparticle, magnesium alloy nanoparticle, aluminum alloy nanoparticle, copper oxide nanometer. Granules, zinc oxide nanoparticles, polyaniline nanoparticles or polypyrrole particles. The nanoparticle 18 has a particle diameter of from 0.3 nm to 500 nm. The nanoparticle 14 has a mass percentage of 0.01% to 99% in the carbon nanotube composite material 10.

The carbon nanotubes in the carbon nanotube composite material 10 provided by the technical solution Interconnected to form a carbon nanotube structure 18, the carbon nanotube structure 18 has good electrical conductivity, so the carbon nanotube composite material 10 has good electrical conductivity, and can be used as an electrode material, a sensor, and an electromagnetic shielding. Cover material or conductive material, etc.; since the carbon nanotube composite material 10 has a plurality of micropores 20, the carbon nanotube composite material 10 has a relatively large specific surface area and has a strong adsorption capacity, so the carbon nanotube composite material 10 can also be used as a support for a carrier or other material of a catalyst.

Referring to FIG. 6 , an embodiment of the present technical solution provides a method for preparing the above carbon nanotube composite material, which specifically includes the following steps:

Step 1. Prepare a carbon nanotube structure.

The method for preparing a carbon nanotube structure specifically includes the following steps:

(1) preparing a carbon nanotube film, the carbon nanotube film comprising a plurality of uniformly distributed carbon nanotubes, the plurality of uniformly distributed carbon nanotubes being ordered or disorderly distributed, the carbon nanotubes Interconnected by Van der Waals forces. The carbon nanotube film can be a carbon nanotube film, a carbon nanotube film or a carbon nanotube film.

According to the difference of the carbon nanotube film, the preparation method of the carbon nanotube film includes: a flocculation method, a rolling method, a direct film drawing method and the like.

The method for preparing a carbon nanotube film by the flocculation method specifically comprises the following steps:

First, a carbon nanotube raw material is provided.

The carbon nanotube raw material may be a carbon nanotube prepared by various methods such as chemical vapor deposition, graphite electrode constant current arc discharge deposition or laser evaporation deposition.

In this embodiment, the aligned carbon nanotube arrays are scraped off the substrate by using a blade or other tool to obtain a carbon nanotube raw material. Preferably, the carbon nanotubes have a length greater than 100 microns.

Next, the above carbon nanotube raw material is added to a solvent and subjected to flocculation treatment to obtain a nano carbon tube floc structure.

In the embodiment of the technical solution, the solvent may be selected from water, a volatile organic solvent or the like. The flocculation treatment can be carried out by a method such as ultrasonic dispersion treatment or high-intensity stirring. Preferably, the embodiment of the technical solution uses ultrasonic dispersion for 10 minutes to 30 minutes. Due to the extremely large specific surface area of the carbon nanotubes, there is a large van der Waals force between the intertwined carbon nanotubes. The above flocculation treatment does not completely disperse the carbon nanotubes in the carbon nanotube raw material in the solvent, and the carbon nanotubes are attracted to each other by the van der Waals force, and are tightly bonded.

Again, the above carbon nanotube floc structure is separated from the solvent, and the carbon nanotube floc structure is shaped to obtain a carbon nanotube flocculation membrane.

In the embodiment of the technical solution, the method for separating the carbon nanotube floc structure comprises the following steps: pouring the solvent containing the nano carbon tube floc structure into a funnel with a filter paper; A period of time is obtained to obtain a separate carbon nanotube floc structure.

In the embodiment of the technical solution, the shaping process of the carbon nanotube floc structure comprises the following steps: placing the above-mentioned carbon nanotube floc structure in a container; and the carbon nanotube floc structure Spreading according to a predetermined shape; applying a certain pressure to the spread of the carbon nanotube floc structure; and drying the solvent remaining in the carbon nanotube floc structure or the like After evaporation, a carbon nanotube film is obtained. Because the carbon nanotubes are mutually attracted and intertwined by van der Waals force, the carbon nanotube film has good flexibility, can be bent and folded into any shape without cracking, and has better Self-supporting performance, without the need for substrate support, self-supporting.

It can be understood that the embodiment of the technical solution can control the thickness and the areal density of the carbon nanotube flocculation film by controlling the area spread by the carbon nanotube floc structure. The larger the area spread by the carbon nanotube floc structure, the smaller the thickness and areal density of the carbon nanotube flocculation film.

In addition, the step of separating and shaping the carbon nanotube floc structure can also be directly performed by suction filtration, and specifically includes the following steps: providing a microporous membrane and an extraction funnel; and the above-mentioned carbon nanotubes are included The solvent of the floc structure is poured into the suction funnel through the microporous membrane; after suction filtration and drying, a carbon nanotube flocculation membrane is obtained. The microporous membrane is a filter membrane having a smooth surface and a pore size of 0.22 μm. Since the suction filtration method itself will provide a large gas pressure on the carbon nanotube floc structure, the carbon nanotube floc structure directly forms a uniform carbon nanotube flocculation membrane by suction filtration. Moreover, since the surface of the microporous filter membrane is smooth, the carbon nanotube film is easily peeled off.

The method for preparing a carbon nanotube film by the direct pull film method specifically comprises the following steps:

First, an array of carbon nanotubes is provided on a substrate that is a super-aligned array of carbon nanotubes.

The carbon nanotube array is prepared by chemical vapor deposition. The body step comprises: (a) providing a flat substrate, the substrate may be selected from a P-type or N-type germanium substrate, or a germanium substrate formed with an oxide layer, and the embodiment of the present invention preferably uses a 4-inch germanium substrate; A catalyst layer is uniformly formed on the surface of the substrate, and the catalyst layer material may be one selected from the group consisting of iron (Fe), cobalt (Co), nickel (Ni) or any combination thereof; (c) the substrate on which the catalyst layer is formed as described above; Annealing in air at 700 ° C ~ 900 ° C for about 30 minutes ~ 90 minutes; (d) the treated substrate is placed in a reaction furnace, heated to 500 ° C ~ 740 ° C in a protective atmosphere, and then into the carbon source gas The reaction is carried out for about 5 minutes to 30 minutes, and an array of carbon nanotubes is grown. The carbon nanotube array is a plurality of pure carbon nanotube arrays formed of carbon nanotubes that are parallel to each other and grown perpendicular to the substrate. The aligned carbon nanotube array contains substantially no impurities, such as amorphous carbon or residual catalyst metal particles, etc., by controlling the growth conditions described above.

The carbon nanotube array provided by the embodiments of the present technical solution is one of a single-walled carbon nanotube array, a double-walled carbon nanotube array, and a multi-walled carbon nanotube array. The carbon nanotubes have a diameter of from 0.5 nm to 50 nm and a length of more than 50 microns. In this embodiment, the length of the carbon nanotubes is preferably from 100 to 900 μm.

In the embodiment of the technical solution, the carbon source gas may be a chemically active hydrocarbon such as acetylene, ethylene or methane. The preferred carbon source gas in the embodiment of the technical solution is acetylene; the shielding gas is nitrogen or an inert gas, and the technical solution is The preferred shielding gas for the examples is argon.

It can be understood that the carbon nanotube array provided by the embodiments of the present technical solution is not limited to the above preparation method, and may be a graphite electrode constant current arc discharge deposition method, a laser evaporation deposition method, or the like.

Next, a stretching tool is used to pull the carbon nanotubes from the carbon nanotube array to obtain at least one carbon nanotube film.

The preparation process of the carbon nanotube film specifically comprises the following steps: the carbon nanotube film is directly drawn from the super-sequential carbon nanotube array, and the preparation method comprises the following steps: (a) using a pull Extending the tool to select a portion of the carbon nanotubes in the super-sequential carbon nanotube array. In this embodiment, it is preferred to contact the carbon nanotube array with a tape having a certain width to select a portion of the carbon nanotubes of a certain width; (b The partial carbon nanotubes are stretched at a certain speed along a growth direction substantially perpendicular to the super-sequential carbon nanotube array to form a continuous carbon nanotube film. And because the carbon nanotubes in the carbon nanotube film are attracted to each other through the van der Waals force, the carbon nanotube film is a self-supporting structure, and the element needs the base support and can be self-supporting. .

During the above stretching process, a part of the carbon nanotubes in the super-aligned carbon nanotube array is gradually separated from the substrate in the stretching direction under the action of the tensile force, and the super-aligned nanocarbon is affected by the van der Waals force. The other carbon nanotubes in the tube array are continuously pulled out end to end to form a carbon nanotube film. The carbon nanotube film comprises a plurality of carbon nanotubes connected end to end and oriented in a stretching direction. The width of the carbon nanotube film is related to the size (diameter/width) of the super-sequential carbon nanotube array, and the thickness of the carbon nanotube film is related to the height of the super-sequential carbon nanotube array.

The method for preparing a carbon nanotube film by the rolling method specifically comprises the following steps:

First, an array of carbon nanotubes is grown on a substrate.

The carbon nanotube array is preferably a super-aligned array of carbon nanotubes. Place The carbon nanotube array is prepared in the same manner as the above-described carbon nanotube array.

Next, a carbon nanotube array is extruded by using a pressing device to obtain a carbon nanotube rolled film, wherein the pressing device applies a certain pressure to the carbon nanotube array. During the pressing process, the carbon nanotube array is separated from the growing substrate by pressure, thereby forming a carbon nanotube rolled film composed of a plurality of carbon nanotubes, and the plurality of nanotubes are described. The carbon nanotubes are substantially parallel to the surface of the carbon nanotube rolled film. Because the carbon nanotubes in the carbon nanotube film are attracted to each other through the van der Waals force, the carbon nanotube film is a self-supporting structure, which can be self-supported without substrate support. .

In the embodiment of the technical solution, the pressing device is an indenter, the surface of the indenter is smooth, and the shape and extrusion direction of the indenter determine the arrangement of the carbon nanotubes in the prepared carbon nanotube rolled film. Specifically, when the planar indenter is pressed in a direction perpendicular to the substrate grown by the carbon nanotube array, the carbon nanotubes are obtained as isotropically arranged carbon nanotube rolled film; When the pressure head is rolled in a certain fixed direction, a carbon nanotube film which is aligned along the fixed direction of the carbon nanotubes can be obtained; when the roller-shaped indenter is rolled in different directions, the naphthalene can be obtained. The carbon nanotubes are arranged in a carbon nanotube tube oriented in different directions.

(2) The carbon nanotube structure is prepared by using the above carbon nanotube film.

The carbon nanotube film can be directly used as a carbon nanotube structure.

Further, at least two layers of carbon nanotube membranes may be overlapped to obtain a carbon nanotube structure. In the carbon nanotube structure, the number of layers of the carbon nanotube film is not The limit can be prepared according to actual needs. When the carbon nanotube structure comprises at least two layers of stacked carbon nanotube film, the carbon nanotube film can be overlapped at any angle, and the carbon nanotubes in the adjacent carbon nanotube film are laminated. The arrangement direction of the tubes forms an angle β, which is greater than or equal to 0 degrees and less than or equal to 90 degrees.

Step 2: Provide a preform that can form nanoparticle.

The preform is a substance corresponding to the nanoparticle, a solution formed by the substance, or a precursor reactant of the substance.

The substance corresponding to the nanoparticle includes a metal, a nonmetal, an alloy, a metal oxide or a polymer. Specifically, the metal may include copper, zinc or cobalt, the non-metal may include carbon particles or diamond, the alloy may include a magnesium alloy or an aluminum alloy, the metal oxide may include copper oxide or zinc oxide, and the polymer may include polyaniline or poly Pyrrole.

A solution of the substance corresponding to the nanoparticle is prepared by dissolving the material in a solvent. The solvent may be a solvent of a material which can dissolve the solid such as water, acid, hydrazine, organic matter, etc., depending on the material.

The precursor reactant of the substance corresponding to the nanoparticle is a reactant capable of generating the material by a chemical reaction, and the reactant may be in a gaseous state, in a liquid state or in a solution, and the substance formed after the reaction is completed is in a solid form. And can be separated from the reaction system by certain methods such as washing, filtration, and the like.

Step 3: compounding the carbon nanotube structure with the preform to obtain a carbon nanotube composite material.

When the preform is a substance corresponding to the nanoparticle, different methods may be employed to composite the nanocarbon tube structure with the nanoparticle preform according to the physical properties of the material itself. When the substance is a gaseous substance, a nano particle can be formed in a carbon nanotube structure by spraying or adsorption; when the substance is in a liquid state, it can be formed in a carbon nanotube structure by spraying or vapor deposition. Nanoparticles; when the material is a solid, it is also possible to form nanoparticles in a carbon nanotube structure by evaporation or sputtering.

When the preform is a solution formed by the substance corresponding to the nanoparticle, the method of combining the carbon nanotube structure with the preform includes the following steps:

First, the solution is used to infiltrate the carbon nanotube structure. The carbon nanotube structure is immersed in the solution or the solution is dropped or sprayed onto the surface of the carbon nanotube structure until it infiltrates the carbon nanotube structure.

Secondly, the infiltrated carbon nanotube structure is placed at a certain temperature to volatilize or evaporate the solvent in the solution, and the carbon nanotube structure is taken out. At this time, the material is attached to the nanocarbon in the form of nano particles. The surface of the carbon nanotubes in the tube structure.

When the preform is a reaction precursor of the corresponding substance of the nanoparticle, the nanoparticle can be formed into the carbon nanotube structure by chemical vapor deposition, plasma assisted deposition, electrochemical deposition or sputtering. .

The carbon nanotube composite material provided by the technical solution can be applied to various fields such as supporting a catalyst, an electrode material, a sensor, an electromagnetic shielding material or a conductive material.

The carbon nanotube composite material and the preparation method thereof have the following advantages: First, since the carbon nanotubes in the carbon nanotube composite material are connected to each other The formation of a carbon nanotube structure, the carbon nanotubes in the carbon nanotube structure are disorderly arranged or ordered, so that the carbon nanotube composite material has greater mechanical strength, better toughness, and overcomes the nanometer. The shortcomings of carbon tube easy to agglomerate. Secondly, since the carbon nanotube structure is used as the skeleton, the carbon nanotube composite material has good electrical conductivity and fully exerts the conductivity of the carbon nanotube. Third, the preparation method of the carbon nanotube composite material does not require a high temperature process or treatment of the surface of the carbon nanotube, so that the carbon nanotubes are not damaged.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧Nano Carbon Tube Composites

16‧‧‧Nano Carbon Tube Structure

18‧‧‧Nano granules

20‧‧‧Micropores

FIG. 1 is a schematic structural view of a carbon nanotube composite material provided by an embodiment of the present technical solution.

2 is a scanning electron micrograph of a carbon nanotube flocculation film provided by an embodiment of the present technical solution.

FIG. 3 is a scanning electron micrograph of a carbon nanotube rolled film including carbon nanotubes arranged in different orientations according to an embodiment of the present invention.

4 is a scanning electron micrograph of a carbon nanotube rolled film including carbon nanotubes arranged in a preferred orientation in the same direction according to an embodiment of the present invention.

FIG. 5 is a scanning electron micrograph of a carbon nanotube film provided by an embodiment of the present technical solution.

FIG. 6 is a flow chart of a method for preparing a carbon nanotube composite material provided by an embodiment of the present technical solution.

10‧‧‧Nano Carbon Tube Composites

16‧‧‧Nano Carbon Tube Structure

18‧‧‧Nano granules

20‧‧‧Micropores

Claims (19)

A carbon nanotube composite material comprising: a plurality of carbon nanotubes and a plurality of nano particles, wherein the plurality of carbon nanotubes form a carbon nanotube structure, and a plurality of nanoparticle particles are distributed In the carbon nanotube structure, the carbon nanotube structure is a skeleton supporting the plurality of nano particles, and the carbon nanotube structure comprises a plurality of carbon nanotubes arranged in a preferred orientation in the same direction. The carbon nanotube composite material according to claim 1, wherein the carbon nanotube composite further comprises a plurality of micropores. The carbon nanotube composite material according to claim 2, wherein the micropores have a diameter of 0.3 nm to 5 mm. The carbon nanotube composite material according to claim 1, wherein the plurality of nano particles are attached to the surface of the carbon nanotube by a van der Waals force. The carbon nanotube composite material according to claim 4, wherein the carbon nanotube structure comprises at least one layer of carbon nanotube membranes, and the carbon nanotubes are connected by van der Waals force. The carbon nanotube composite material according to claim 5, wherein the carbon nanotube film comprises a plurality of carbon nanotubes connected end to end and arranged in a preferred orientation in the same direction. The carbon nanotube composite material according to claim 6, wherein the carbon nanotube film has a thickness of from 0.5 nm to 100 μm. The carbon nanotube composite material according to claim 6, wherein the carbon nanotube structure comprises at least two layers of carbon nanotube membranes arranged in an overlapping manner, and between adjacent carbon nanotube membranes The arrangement direction of the carbon nanotubes forms an angle β, and β is greater than or equal to 0 degrees and less than or equal to 90 degrees. The carbon nanotube composite material according to claim 8, wherein the plurality of nano particles are distributed between the carbon nanotube films. The carbon nanotube composite material according to claim 8, wherein the β is equal to 90 degrees. The carbon nanotube composite material according to claim 1, wherein the nanoparticle comprises one or more of a nanofiber, a nanorod, a nanosphere, and a nanowire. The carbon nanotube composite material according to claim 1, wherein the material of the nanoparticle is one or more of a metal, a nonmetal, an alloy, a metal oxide, and a polymer. The carbon nanotube composite material according to claim 1, wherein the nanoparticle has a particle diameter of from 0.3 nm to 500 nm. The carbon nanotube composite material according to claim 1, wherein the nanoparticle has a mass percentage of 0.01% to 99% in the carbon nanotube composite material. A method for preparing a carbon nanotube composite material, comprising: providing a preform of one nanometer particle; preparing a carbon nanotube structure, the carbon nanotube structure comprising a plurality of carbon nanotubes arranged in a certain manner; And after the carbon nanotube structure is formed, the nano carbon nanotube structure is used as a matrix, and the nanoparticle preform is combined to form a nanoparticle, a carbon nanotube on the surface of the carbon nanotube structure. The arrangement of a plurality of carbon nanotubes in the structure is unchanged. The method for preparing a carbon nanotube composite material according to claim 15, wherein the method for preparing a carbon nanotube structure comprises a flocculation method, a rolling method, and a film stretching method. The method for preparing a carbon nanotube composite material according to claim 15, wherein the preform is formed of a material corresponding to the nanoparticle. The solution, the method of compounding the preform with the carbon nanotube structure comprises the steps of: infiltrating the carbon nanotube structure with the solution; and placing the infiltrated carbon nanotube structure at a certain temperature to volatilize the solvent in the solution. The method for preparing a carbon nanotube composite material according to claim 15, wherein the preform is a material corresponding to the nano particle, and when the material is in a gaseous state, a spraying or adsorption method is used. Forming nano particles in the carbon nanotube structure; when the material is in a liquid state, forming nano particles in the carbon nanotube structure by spraying or vapor deposition; when the material is solid, using evaporation or sputtering The method forms nanoparticles in a carbon nanotube structure. The method for preparing a carbon nanotube composite material according to claim 15, wherein the preform is a precursor reactant of a material corresponding to a nanoparticle formed by a chemical reaction, and is chemical vapor deposition. Plasma-assisted deposition, electrochemical deposition or sputtering forms nanoparticles in the nanotube structure.