TWI464107B - Method for preparing nano carbon tube structure - Google Patents

Description

Method for preparing nano carbon tube structure

The invention relates to a method for preparing a carbon nanotube structure.

Carbon Nanotube (CNT) is a hollow tube made of graphene sheets. It has excellent mechanical, thermal and electrical properties and therefore has a wide range of applications. Since the size of a single carbon nanotube is nanometer, it is difficult to process. For practical application, a plurality of carbon nanotubes are tried as raw materials to form a macrostructure having a large size. The macrostructure consists of a plurality of carbon nanotubes and may be in the form of a film, a line or other shape. In the prior art, a macroscopic membrane structure composed of a plurality of carbon nanotubes is generally referred to as a Carbon Nanotube Film, and a macroscopic linear structure composed of a plurality of carbon nanotubes is referred to as a nanocarbon pipeline ( Carbon Nanotube Wire) or Carbon Nanotube Cable. A carbon nanotube rope obtained by directly pulling from a carbon nanotube array is disclosed in Chinese Patent Publication No. CN1483667A, which has a macroscopic scale and is self-supporting. It includes a number of carbon nanotubes connected end to end under the action of Van der Valli. Since the carbon nanotubes in the carbon nanotube rope extend substantially in the same direction, the carbon nanotube rope can exhibit various excellent properties such as electrical conductivity and heat conduction in the axial direction of the carbon nanotube, and has a wide range of properties. Application prospects. Alternatively, a carbon nanotube film can be drawn from the carbon nanotube array similarly to the above-described drawn carbon nanotube string.

However, both the carbon nanotube and the carbon nanotube membrane are pulled from the array of carbon nanotubes, and the diameter of the rope or the width of the membrane is limited by the size of the array of carbon nanotubes. The carbon nanotube array in the prior art is generally obtained by chemical vapor deposition, in particular, a flat circular bract is used as a substrate, a catalyst film is formed on one surface, placed in a reaction furnace for heating, and carbon is introduced. The source gas and the shielding gas are decomposed by the catalyst on the surface of the crucible, and a carbon nanotube is grown on the surface of the crucible. The reactor currently used to grow carbon nanotube arrays is a 10-inch diameter tubular reactor. Since the gas pressure in the tubular reactor is less than the atmospheric pressure outside the furnace during the above growth process, the furnace wall of the tubular reactor will be subjected to the inward pressure, making the inner diameter of the tubular reactor difficult to be large. Generally, when the tubular reactor has a diameter of 10 inches, a length of 2 meters, and an internal gas pressure of 10 Torr, the pressure difference between the inner and outer walls is 50,000 Newtons. When the diameter of the tubular reactor is increased to 40 inches, the pressure difference between the inner and outer walls can reach 200,000 Newtons. Moreover, when the diameter is increased, since the curvature of the furnace wall of the tubular reactor is lowered, the supporting action is also weakened, and the stability of the tubular reactor is deteriorated or even broken, which affects safety.

Therefore, when a carbon nanotube array is grown in a 10-inch tubular reactor using a circular cymbal as a substrate, the circular cymbal has a maximum diameter of about 8 inches, allowing the nano-growth from the circular cymbal. The width of the carbon nanotube film drawn in the carbon tube array or the diameter of the rope is limited. The carbon nanotube film is only about 8 inches wide and cannot meet the needs of practical applications.

In view of this, it is necessary to provide a preparation method capable of obtaining a carbon nanotube structure having a large size.

A method for preparing a carbon nanotube structure, comprising the steps of: providing a cylindrical carbon nanotube array; and extracting a carbon nanotube structure from the tubular carbon nanotube array by using a stretching tool .

A method for preparing a carbon nanotube structure, comprising the steps of: providing a cylindrical carbon nanotube array and a stretching tool, the cylindrical carbon nanotube array having an opening in the axial direction, the stretching tool Forming a shape corresponding to a cross-sectional shape of the tubular carbon nanotube array; using the stretching tool to extract a tubular carbon nanotube film having an opening from the cylindrical carbon nanotube array; The stretching tool is straightened so that the tubular carbon nanotube film is flattened from the opening.

A method for preparing a carbon nanotube structure, comprising the steps of: providing a cylindrical carbon nanotube array; selecting a carbon nanotube segment from the tubular carbon nanotube array by using a stretching tool; The stretching tool moves away from the array of carbon nanotubes at a certain speed along the axial direction of the cylindrical carbon nanotube array to pull the selected carbon nanotube segments, thereby pulling out a plurality of continuous naphthalenes end to end. a carbon nanotube segment; forming the plurality of carbon nanotube segments into a pyramidal structure and converging into a nanocarbon line at the apex of the pyramidal structure.

Compared with the prior art, since the carbon nanotube array is cylindrical, the cylindrical carbon nanotube array prepared in the same existing reactor has a larger size than the planar carbon nanotube array, so that The carbon nanotube structure obtained from the drawing also has a larger size.

Hereinafter, a method for preparing a carbon nanotube structure according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The embodiment of the invention provides a method for preparing a carbon nanotube structure 100, which comprises the following steps:

Step 1: A cylindrical carbon nanotube array 120 is provided.

Step 2: Pulling a carbon nanotube structure 100 from the tubular carbon nanotube array 120 by using a stretching tool 110.

The following describes each step separately.

First, step one is further explained. Referring to FIG. 1 and FIG. 2, the cylindrical carbon nanotube array 120 is formed on the surface of a substrate 140 having a cylindrical cylinder by chemical vapor deposition, preferably a super-aligned tubular carbon nanotube. Array 120. The super-aligned cylindrical carbon nanotube array 120 can be formed on the catalyst layer on the surface of the substrate 140 by chemical vapor deposition. In this embodiment, the method for preparing the super-aligned cylindrical carbon nanotube array 120 specifically includes:

(a) providing a substrate 140, the substrate 140 comprising at least one cylindrical cylinder;

(b) uniformly forming a catalyst layer on the at least one cylindrical surface of the substrate 140;

(c) annealing the substrate 140 on which the catalyst layer is formed in air at 300 ° C to 900 ° C (eg, 700 ° C) for about 30 minutes to 90 minutes;

(d) placing the substrate 140 in a reaction furnace, heating to 500 ° C to 900 ° C (such as 740 ° C) under a protective gas atmosphere, and then introducing a carbon source gas for about 5 minutes to 30 minutes to grow super-aligned. A cylindrical carbon nanotube array 120.

The cylindrical cylindrical surface of the substrate includes, but is not limited to, the following.

The substrate may be a cylindrical body (hollow body) having two inner and outer surfaces, both inner and outer surfaces serving as the cylindrical cylindrical surface, and the cylindrical wall of the cylindrical body may further be axially An opening is provided, and for convenience of description, the two cases of having an opening (not closed) and an opening (closed) are collectively referred to as a cylindrical body. Referring to FIG. 2, in the embodiment, the substrate 140 is a circular closed cylindrical body. The carbon nanotube array 120 is formed on the inner surface of the cylindrical body to form a closed tubular shape. Carbon tube array 120. Referring to FIG. 3, the base 140a may be an unsealed cylindrical body having an opening 142 parallel to the axial direction of the cylindrical body, the cylindrical body having an unclosed circular cross section. The carbon nanotube array 120a is formed on the inner surface of the unsealed cylindrical body to form an unsealed tubular carbon nanotube array 120a. The unsealed cylindrical carbon nanotube array 120a includes a parallel The cylindrical carbon nanotube array has an axial opening. Referring to FIG. 4, the substrate 140b may also be a closed cylindrical body having a rectangular cross section, the rectangle having a rounded corner 144. The carbon nanotube array 120b is formed on the inner surface of the cylindrical body to form a closed cylindrical carbon nanotube array 120b. Referring to FIG. 5, the base 140c may also be an unsealed cylindrical body having an opening 142 parallel to the axial direction of the cylindrical body, the cylindrical body having a cross section of an unclosed rectangle having rounded corners. The carbon nanotube array 120c is formed on an inner surface of the unsealed cylindrical body to form an unsealed tubular carbon nanotube array 120c. The unclosed cylindrical carbon nanotube array 120c includes a parallel The cylindrical carbon nanotube array has an axial opening. It is to be understood that the substrate is not limited to the above shape, and the cross section of the substrate may be an ellipse or other polygon having rounded corners or the like. It can be understood that in order to smoothly grow the carbon nanotube array and to pull the carbon nanotube structure 100 from the cylindrical inner surface, the cylindrical body has an opening at least at one end. Preferably, both ends of the cylindrical body have openings.

The substrate may also be a columnar body (solid body), the columnar outer peripheral surface forming the cylindrical cylinder surface, similar to the cylindrical body, the column body may be round, elliptical or rounded The polygonal shape may further be provided with an elongated opening in the axially outer peripheral surface of the column to form a cylindrical cylindrical surface having an opening in the axial direction, and the cross section of the cylindrical body is a circle, an ellipse or a circle having a notch. Angular polygons, etc.

The substrate 140 may be a quartz substrate, a high temperature resistant glass substrate, a P-type or N-type germanium substrate, a metal substrate having a high melting point or a germanium substrate formed with an oxide layer. In this embodiment, a quartz having a relatively smooth surface is preferred. tube. The substrate 140 described above is capable of withstanding the annealing and reaction temperatures during growth of the carbon nanotube array 120 without deformation or melting.

Referring to FIG. 6, when the substrate 140 is a cylindrical body, the cylindrical carbon nanotube array 120 can be formed on the outer surface of the cylindrical body by changing the position of the catalyst layer.

The catalyst layer material may be selected from one of iron (Fe), cobalt (Co), nickel (Ni) or any combination thereof, preferably an iron catalyst layer of about 5 nm thick. The catalyst layer may be formed on at least one of an inner surface and an outer surface of the quartz tube. When both the inner and outer surfaces of the quartz tube are formed with a catalyst layer, the quartz tube can be used to form two nested cylindrical carbon nanotube arrays 120. In this embodiment, the catalyst layer is formed on the inner surface of the quartz tube.

When the reaction furnace is a tubular reactor, the substrate 140 may be disposed in the tubular reactor in the axial direction of the tubular reactor. Further, both ends of the substrate 140 may be fixed by a bracket to suspend the substrate 140 in the reaction furnace. The carbon source gas may be selected from acetylene, ethylene, ethane, etc., preferably a chemically active hydrocarbon such as acetylene, and the protective gas may be nitrogen, ammonia or an inert gas.

The cylindrical carbon nanotube array 120 includes a plurality of carbon nanotubes that are parallel to each other and perpendicular to the surface of the substrate 140. The top surface of the cylindrical carbon nanotube array 120 is a cylindrical surface parallel to the surface of the substrate 140. The tubular carbon nanotube array 120 is substantially free of impurities such as amorphous carbon or residual catalyst metal particles, etc., by controlling the growth conditions described above. The carbon nanotubes in the cylindrical carbon nanotube array 120 are in close contact with each other to form an array by van der Waals force. The growth area of the cylindrical carbon nanotube array 120 may be substantially the same as the area of the substrate 140 described above. The carbon nanotubes in the tubular carbon nanotube array 120 may include at least one of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube. The height of the carbon nanotubes in the cylindrical carbon nanotube array 120 is from 2 micrometers to 10 millimeters, preferably from 100 micrometers to 900 micrometers. The diameter of the carbon nanotubes is from 1 nm to 50 nm.

When the substrate 140 is a cylindrical body having an opening parallel to the axial direction, the cylindrical carbon nanotube array 120 also has an opening parallel to the axial direction. In addition, when the tubular carbon nanotube array 120 is formed in a closed cylindrical body, a part of the carbon nanotubes can be further removed along the axial direction of the cylindrical carbon nanotube array 120, thereby making the cylindrical nanocarbon The tube array 120 has an opening in the axial direction.

The step 2 specifically includes the following steps: (e) selecting a carbon nanotube segment from the tubular carbon nanotube array 120; (f) a certain axial direction along the cylindrical carbon nanotube array 120 The selected carbon nanotube segments are drawn at a speed such that a plurality of consecutive carbon nanotube segments are drawn end to end to form a continuous carbon nanotube structure 100.

Referring to FIG. 7, in the above step (e), the carbon nanotube segment 143 is composed of one of the cylindrical carbon nanotube arrays 120 or a plurality of adjacent mutually parallel bundles of carbon nanotubes 145. . The stretching tool 110 is used to select and pull the carbon nanotube segments. The stretching tool 110 can be a tweezers, a clip, an adhesive tape or a base strip having a glue on the surface. The process of selecting the carbon nanotube segments may be to pick up a portion of the carbon nanotubes in the tubular carbon nanotube array 120 by using tweezers or clips, or to contact the tubular naphthalene with a tape or a strip of adhesive. Carbon tube array 120. Preferably, the selected carbon nanotube segments are located at an axial edge of the cylindrical carbon nanotube array 120.

Referring to FIG. 8 , the shape of the stretching tool 110 may correspond to the cross-sectional shape of the tubular carbon nanotube array 120 , and specifically may be a surface-applied ring tool, and the ring tool and the ring tool The cross section of the cylindrical carbon nanotube array 120 has substantially equal diameters and shapes. When the tubular carbon nanotube array 120 is a cylinder, the stretching tool 110 can be a ring. The process of selecting the carbon nanotube segments is such that the ring is coaxially disposed with the cylindrical carbon nanotube array 120 and is in contact with each other to make one of the tubular carbon nanotube arrays 120 in contact with the ring. The carbon nanotubes are adhered by the adhesive on the surface of the ring to form a circular carbon nanotube segment.

When the tubular carbon nanotube array 120 is formed on the inner surface of the cylindrical body, the stretching tool 110 pulls the carbon nanotube structure 100 from the inside of the cylindrical body. When the tubular carbon nanotube array 120 is formed on the outer surface of the cylindrical body, the stretching tool 110 pulls the carbon nanotube structure 100 from the outside of the cylindrical body. When the inner and outer surfaces of the cylindrical body respectively have a cylindrical carbon nanotube array 120, by changing the structure of the stretching tool 110, the nanometer can be simultaneously pulled from the inner surface and the outer surface of the cylindrical body. Carbon tube structure 100.

In the above step (f), the stretching tool 110 moves along the axial direction of the cylindrical carbon nanotube array 120 and gradually moves away from the cylindrical carbon nanotube array 120, thereby pulling the selected navel at a certain speed. Carbon tube fragment. The direction of the drawing is preferably parallel to the growth surface of the substrate 140 carbon nanotube array 120. When the selected carbon nanotube segment is gradually separated from the substrate 140 in the pulling direction under the pulling force, the other carbon nanotube segments adjacent to the selected carbon nanotube segment are end to end due to the van der Waals force. They are successively pulled out in succession to form a continuous, uniform carbon nanotube structure 100. The carbon nanotube structure 100 can be a carbon nanotube membrane having a certain width or a carbon nanotube having a certain diameter. The formed carbon nanotube structure 100 is the width of the carbon nanotube segment selected by the stretching tool 110 of the nano carbon pipeline and the carbon nanotube membrane, and after pulling out a plurality of continuous carbon nanotube segments. The processing steps are decided.

The following two aspects of the formation of the nanocarbon line and the carbon nanotube film will be specifically described below.

As shown in FIG. 9, when the width of the selected carbon nanotube segments is narrow, a nanocarbon line 102 can be formed by further processing the drawn carbon nanotube segments. Specifically, when the stretching tool 110 pulls the selected carbon nanotube segment along the axial direction of the cylindrical carbon nanotube array 120, the carbon nanotube segment adjacent to the selected carbon nanotube segment The hollow cone structure 104 is continuously drawn from the tubular carbon nanotube array 120 end to end by the action of the van der Waals force, and the carbon nanotube segments are allowed to be in the cone by further processing. The vertices of the structure converge into a nanocarbon pipeline 102.

The process of forming the nanocarbon line 102 can further include treating the drawn plurality of carbon nanotube segments with an organic solvent, and the carbon nanotube segments are gathered at the top of the cone structure 104 to form the nano Carbon line 102. In this embodiment, the organic solvent is volatilized after the cone structure 104 is wetted by the organic solvent and concentrated into the nanocarbon line 102. The organic solvent is a volatile organic solvent such as ethanol, methanol, acetone, dichloroethane or chloroform, and ethanol is used in this embodiment. Under the action of the surface tension generated by the volatilization of the volatile organic solvent, the carbon nanotubes in the cone structure 104 are gathered by the van der Waals force to form a non-twisted nanocarbon line 102.

The process of forming the nanocarbon line 102 can further include rotating the stretching tool 110 along an axis of the cylindrical carbon nanotube array 120 to twist the drawn plurality of carbon nanotube segments, and A twisted nanocarbon line 102 is formed at the apex of the cone structure 104.

The nanocarbon line 102 is a self-supporting structure composed of a plurality of carbon nanotubes. The plurality of carbon nanotubes are arranged in a preferred orientation along the length of the nanocarbon line 102. Further, most of the carbon nanotubes in the nanocarbon pipeline 102 are connected end to end by Van der Waals force. Specifically, the nanocarbon pipeline 102 includes a plurality of carbon nanotube segments, the plurality of carbon nanotube segments are connected end to end by van der Waals force, and each of the carbon nanotube segments is parallel to each other and passes through the van der Waals Valli combines the composition of carbon nanotubes. The carbon nanotube segments have any length, thickness, uniformity, and shape. Referring to FIG. 10, when the nanocarbon line 102 is a non-twisted nanocarbon line, a plurality of carbon nanotubes arranged substantially parallel to the length of the nanocarbon line 102 are included. Referring to FIG. 11, when the nanocarbon line 102 is a twisted nanocarbon line 102, a plurality of carbon nanotubes axially arranged around the nanocarbon line 102 are included.

As shown in Fig. 12, when the width of the selected carbon nanotube segments is wide, a carbon nanotube film 106 can be formed. Specifically, when the stretching tool 110 pulls the carbon nanotube segments in the axial direction of the cylindrical carbon nanotube array 120, the carbon nanotube film 106 having an equal width with the selected carbon nanotube segments It is pulled out from the carbon nanotube array 120. Preferably, when the shape of the stretching tool 110 corresponds to the cross-sectional shape of the tubular carbon nanotube array 120, the tube is selected and pulled by the stretching tool 110 to obtain a tube. Shaped carbon nanotube film 106. In this embodiment, the stretching tool 110 is a ring having a glue to correspond to the cross section of the closed cylindrical carbon nanotube array 120, and is pulled to obtain a cylindrical carbon nanotube film 106. .

Further, the cylindrical carbon nanotube film 106 can be developed into a planar carbon nanotube film 106. The planar carbon nanotube film 106 can be laid on a substrate surface. The ring can be an elastic rubber ring so that it can be unfolded and straightened. Specifically, when the tubular carbon nanotube film 106 is in a closed structure, the stretching tool 110 can be disconnected from one point and passed along a shaft of the cylindrical carbon nanotube film 106 through a laser etching step. The tubular carbon nanotube film 106 is cut from the break, an opening is formed in the tubular carbon nanotube film 106, and the tubular carbon nanotube film is formed by straightening the stretching tool 110. 106 is flattened from the opening.

Referring to FIG. 3 and FIG. 13, in another embodiment, the substrate 140a has the opening 142 such that the cylindrical carbon nanotube array 120a formed on the substrate 140a also has an opening. The shape of the stretching tool 110a corresponds to the cross-sectional shape of the cylindrical carbon nanotube array 120a, and also has an opening. The cylindrical carbon nanotube film 106a obtained by pulling the tubular carbon nanotube array 120a by the stretching tool 110a also has an axial opening 108. In this case, the pulling can be directly performed. The extension tool 110a is straightened such that the tubular carbon nanotube film 106a is flattened from the film opening 108.

In addition, the cylindrical carbon nanotube array 120a having an opening may be formed by other methods, for example, depositing a catalyst layer having an opening on the surface of the closed cylindrical body or the columnar substrate, or forming a closed cylindrical shape The carbon nanotube array is axially removed from the partial carbon nanotube array to form the opening.

Referring to Figure 14, the formed carbon nanotube film 106 is a self-supporting structure composed of a plurality of carbon nanotubes. The plurality of carbon nanotubes are arranged in a preferred orientation along the length of the carbon nanotube film 106. The preferred orientation means that the overall direction of extension of most of the carbon nanotubes in the carbon nanotube membrane 106 is substantially in the same direction. Moreover, the overall direction of extension of the majority of the carbon nanotubes is substantially parallel to the surface of the carbon nanotube film 106. Further, most of the carbon nanotubes in the carbon nanotube membrane 106 are connected end to end by Van der Waals force. Specifically, each of the carbon nanotubes in the majority of the carbon nanotube membranes 106 extending in the same direction and the carbon nanotubes adjacent in the extending direction are connected end to end by Van der Waals force . Of course, there are a few carbon nanotubes in the carbon nanotube film 106 that deviate from the extending direction. These carbon nanotubes do not constitute an obvious alignment of the majority of the carbon nanotubes in the carbon nanotube film 106. influences. The self-supporting carbon nanotube film 106 does not require a large-area carrier support, but can maintain its own membranous state by simply providing a supporting force on both sides, that is, placing the carbon nanotube film 106 (or When fixed to two supports disposed at a predetermined distance, the carbon nanotube film 106 located between the two supports can be suspended to maintain its own film state. The self-supporting is mainly achieved by the presence of a continuous carbon nanotube in the carbon nanotube film 106 which is continuously arranged by van der Waals force. Specifically, most of the carbon nanotube membranes 106 extend substantially in the same direction, and are not absolutely linear, and may be appropriately bent; or may not be completely aligned in the extending direction, and may be appropriately deviated from the extending direction. . Therefore, partial contact between the carbon nanotubes juxtaposed in the majority of the carbon nanotubes extending substantially in the same direction of the carbon nanotube film 106 cannot be excluded.

Specifically, referring to FIG. 7, the carbon nanotube film 106 includes a plurality of continuous and aligned carbon nanotube segments 143. The plurality of carbon nanotube segments 143 are connected end to end by Van der Waals force. Each of the carbon nanotube segments 143 is composed of a plurality of mutually parallel carbon nanotubes 145. The carbon nanotube segments 143 have any length, thickness, uniformity, and shape. The carbon nanotube film 106 has a thickness of 0.5 nm to 100 μm, and the maximum width is equal to the circumferential length perpendicular to the axial direction of the cylindrical carbon nanotube array, and the length is not limited. The specific surface area of the carbon nanotube film 106 is greater than 100 square meters per gram. When the cylindrical carbon nanotube array 120 is 8 inches in diameter, the carbon nanotube film 106 has a maximum width of about 64 cm. The carbon nanotube film 106 has good light transmittance, and the visible light transmittance can reach 75% or more.

An embodiment of the present invention further includes a method of forming a carbon nanotube line, the method comprising: providing a cylindrical carbon nanotube array; and selecting a carbon nanotube from the tubular carbon nanotube array by using a stretching tool Fragmenting; moving the stretching tool away from the array of carbon nanotubes at a certain speed along the axial direction of the cylindrical carbon nanotube array to pull the selected carbon nanotube segments, thereby pulling the end-to-end connection Successive carbon nanotube segments; forming the plurality of carbon nanotube segments into a pyramidal structure and concentrating into a nanocarbon line at the apex of the pyramidal structure. Specifically, the drawn carbon nanotube fragments may be infiltrated by a volatile organic solvent and concentrated in the pyramid structure into a nanocarbon line; and the organic solvent is volatilized. Alternatively, the stretching tool can be formed by rotating the stretching tool along the axis of the cylindrical carbon nanotube array to form a twisted nanocarbon line at the apex of the pyramid structure.

The embodiment of the invention further includes a method for forming a tubular carbon nanotube film, which specifically includes: providing a cylindrical carbon nanotube array and a stretching tool, the shape of the stretching tool and the tubular nanometer The cross-sectional shape of the carbon tube array corresponds to; a tubular carbon nanotube film is obtained by pulling the tubular carbon nanotube array using the stretching tool. Specifically, the stretching tool is used to select a carbon nanotube segment from the axial edge of the tubular carbon nanotube array; and the stretching tool is fixed along the axial direction of the cylindrical carbon nanotube array. The velocity moves away from the array of carbon nanotubes to pull the selected carbon nanotube segments, thereby pulling out a plurality of carbon nanotube segments end to end to form a continuous tubular carbon nanotube film.

The embodiment of the invention further includes a method for forming a planar carbon nanotube film, which comprises: providing a cylindrical carbon nanotube array and a stretching tool, the cylindrical carbon nanotube array having one axial direction Opening, the shape of the stretching tool corresponding to the cross-sectional shape of the tubular carbon nanotube array; using the stretching tool to pull from the cylindrical carbon nanotube array to obtain a cylindrical nanometer having an opening a carbon tube film; and straightening the stretching tool to flatten the tubular carbon nanotube film from the opening to obtain a planar carbon nanotube film.

Since the substrate can have a larger surface area for growing the carbon nanotube array, in the same reaction furnace as in the prior art, the space inside the reactor can be fully utilized to grow a larger size nanometer. The carbon tube array is such that the carbon nanotube film obtained by drawing from the carbon nanotube array has a large width, and the nano carbon line has a large diameter. The carbon nanotube film having a large width can be conveniently used as a transparent conductive film in a large-area touch screen and a liquid crystal display device, and the larger diameter nano carbon line can be used to improve the strength of the cable. . In addition, since the length of the tubular carbon nanotube array can be substantially equal to the length of the reactor chamber, a longer length carbon nanotube structure can be drawn from the tubular carbon nanotube array. .

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.

100‧‧‧Nano carbon nanotube structure

120, 120a, 120b, 120c‧‧‧ tubular carbon nanotube array

110, 110a‧‧‧ stretching tools

140, 140a, 140b, 140c‧‧‧Base

142‧‧‧ openings

143‧‧‧Nano carbon nanotube fragments

144‧‧‧ fillet

145‧‧・Nano carbon tube

104‧‧‧Cone structure

102‧‧‧Nano carbon pipeline

106, 106a‧‧ nm carbon nanotube film

108‧‧‧film opening

1 is a schematic structural view of a cylindrical carbon nanotube array according to an embodiment of the present invention.

2 is a cross-sectional view of the tubular carbon nanotube array formed on the inner surface of a circular cylindrical body according to an embodiment of the present invention taken along II-II.

Fig. 3 is a schematic cross-sectional view showing the cylindrical carbon nanotube array formed on the inner surface of the circular cylindrical body having an opening perpendicular to the axial direction of the cylindrical body according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view showing the cylindrical carbon nanotube array formed on the inner surface of the rectangular cylindrical body in the axial direction of the embodiment of the present invention.

Fig. 5 is a cross-sectional view showing the cylindrical carbon nanotube array formed on the inner surface of the rectangular cylindrical body having an opening perpendicular to the axial direction of the cylindrical body in the embodiment of the present invention.

Fig. 6 is a cross-sectional view showing the cylindrical carbon nanotube array formed on the outer surface of the circular cylindrical body in the axial direction of the cylindrical body in the embodiment of the present invention.

Figure 7 is a schematic view showing the structure of a carbon nanotube segment.

Fig. 8 is a schematic view showing the structure of a stretching tool corresponding to a cylindrical carbon nanotube array.

Figure 9 is a schematic view showing the process of drawing a nanocarbon line from a cylindrical carbon nanotube array.

Figure 10 is a scanning electron micrograph of a non-twisted nanocarbon line of an embodiment of the present invention.

Figure 11 is a scanning electron micrograph of a twisted nanocarbon line of an embodiment of the present invention.

Figure 12 is a schematic view showing the process of drawing a carbon nanotube film from a cylindrical carbon nanotube array.

Figure 13 is a schematic illustration of a process for drawing an open carbon nanotube membrane from an array of tubular carbon nanotube tubes having an opening.

Figure 14 is a scanning electron micrograph of a carbon nanotube film of an embodiment of the present invention.

102‧‧‧Nano carbon pipeline

104‧‧‧Cone structure

120‧‧‧Cylindrical carbon nanotube array

140‧‧‧Base

Claims (22)

A method for preparing a carbon nanotube structure, comprising the steps of:
A cylindrical carbon nanotube array is provided; and a carbon nanotube structure is obtained by pulling from the tubular carbon nanotube array using a stretching tool. The method for preparing a carbon nanotube structure according to claim 1, wherein the method for preparing the tubular carbon nanotube array comprises the following steps:
Providing a substrate comprising at least one cylindrical cylinder;
Forming a catalyst layer uniformly on the at least one cylindrical surface of the substrate; and growing a super-aligned carbon nanotube array on the cylindrical surface of the growth substrate by chemical vapor deposition. The method for preparing a carbon nanotube structure according to claim 2, wherein the substrate is a solid column, and the cylindrical carbon nanotube array is formed on an outer surface of the solid column. . The method for preparing a carbon nanotube structure according to claim 1, wherein the cylindrical carbon nanotube array has an opening parallel to an axial direction of the cylindrical carbon nanotube array. The method for preparing a carbon nanotube structure according to claim 2, wherein the substrate is a hollow cylindrical body having an inner surface and an outer surface, and the cylindrical carbon nanotube array is formed on At least one of the inner surface and the outer surface, the stretching tool is drawn from at least one of the inner surface and the outer surface to form the carbon nanotube structure. The method for preparing a carbon nanotube structure according to claim 5, wherein the cylindrical carbon nanotube array is formed on the inner surface and the outer surface, and the stretching tool is from the inner surface and the outer surface. The surface is simultaneously pulled to form the carbon nanotube structure. The method for preparing a carbon nanotube structure according to claim 2, wherein the substrate has a circular, elliptical or polygonal shape with rounded cross section. The method for preparing a carbon nanotube structure according to claim 2, wherein the substrate is a quartz substrate, a high temperature resistant glass substrate, a P-type germanium substrate, an N-type germanium substrate, a high temperature resistant metal substrate, or formed with The tantalum substrate of the oxide layer. The method for preparing a carbon nanotube structure according to claim 2, wherein the reactor is a tubular reactor, and the substrate is disposed in the tubular reactor along an axial direction of the tubular reactor. Inside. The method for preparing a carbon nanotube structure according to claim 1, wherein the step of extracting the carbon nanotube structure from the tubular carbon nanotube array by using a stretching tool comprises: :
Selecting a carbon nanotube segment from the tubular carbon nanotube array by using a stretching tool; and moving the stretching tool away from the carbon nanotube at a certain speed along the axial direction of the cylindrical carbon nanotube array The array is moved to pull the selected carbon nanotube segments, thereby pulling out a plurality of carbon nanotube segments end to end to form a continuous carbon nanotube structure. The method for preparing a carbon nanotube structure according to claim 10, wherein the carbon nanotube segment is a carbon nanotube or a bundle of substantially parallel carbon nanotubes. Carbon tube. The method for preparing a carbon nanotube structure according to claim 10, wherein the selected carbon nanotube segment is located at an axial edge of the cylindrical carbon nanotube array. The method for producing a carbon nanotube structure according to claim 10, wherein the shape of the stretching tool corresponds to a cross-sectional shape of the tubular carbon nanotube array. The method for preparing a carbon nanotube structure according to claim 13, wherein the tubular carbon nanotube array is a cylinder, and the stretching tool is a ring having a glue. The method for preparing a carbon nanotube structure according to claim 14, wherein the ring is coaxially disposed with the cylindrical carbon nanotube array and is in contact with each other to make a contact with the ring The carbon nanotubes are adhered by the adhesive on the surface of the ring to select a circular carbon nanotube segment. The method for preparing a carbon nanotube structure according to claim 13, wherein the carbon nanotube structure is a tubular carbon nanotube film. The method for preparing a carbon nanotube structure according to claim 16, wherein the method further comprises:
Disconnect the stretching tool from one point;
Cutting the tubular carbon nanotube film from the break along the axial direction of the tubular carbon nanotube film by a laser etching step to form an opening in the tubular carbon nanotube film; The stretching tool is straightened to flatten the tubular carbon nanotube film from the opening. A method for preparing a carbon nanotube structure, comprising the steps of:
Providing a cylindrical carbon nanotube array and a stretching tool, the cylindrical carbon nanotube array having an opening in the axial direction, a shape of the stretching tool and a cross-sectional shape of the tubular carbon nanotube array correspond;
Using the stretching tool to extract a tubular carbon nanotube film having an opening from the tubular carbon nanotube array; and straightening the stretching tool to make the tubular carbon nanotube The film is flattened from the opening. The method for preparing a carbon nanotube structure according to claim 18, wherein the cylindrical carbon nanotube array is formed on an inner surface or an outer surface of a hollow cylindrical body, the hollow cylindrical body having An opening parallel to the axial direction of the hollow cylindrical body. A method for preparing a carbon nanotube structure, comprising the steps of:
Providing a cylindrical carbon nanotube array;
Selecting a carbon nanotube segment from the tubular carbon nanotube array using a stretching tool;
Moving the stretching tool away from the carbon nanotube array at a certain speed along the axial direction of the cylindrical carbon nanotube array to pull the selected carbon nanotube segments, thereby pulling out a plurality of consecutive ends a carbon nanotube segment; and forming the plurality of carbon nanotube segments into a pyramidal structure and concentrating into a nanocarbon line at the apex of the pyramid structure. The method for preparing a carbon nanotube structure according to claim 20, further comprising:
Soaking the drawn carbon nanotube fragments by a volatile organic solvent, thereby condensing the plurality of carbon nanotube fragments into a pyramid structure, and concentrating into the nano carbon line at the apex of the pyramid structure; And volatilizing the organic solvent. The method for preparing a carbon nanotube structure according to claim 20, further comprising rotating the stretching tool along an axis of the cylindrical carbon nanotube array to form the pyramid structure, and The apex of the pyramidal structure forms a twisted nanocarbon line.