WO2022092425A1 - Carbon nanotube sheet roll emitter with improved structural stability, manufacturing method therefor, and field emission device using same - Google Patents

Abstract

One embodiment of the present invention provides a carbon nanotube sheet roll emitter with improved structural stability, a manufacturing method therefor, and a field emission device using the same. The carbon nanotube sheet roll emitter comprises a carbon nanotube sheet roll in which a carbon nanotube sheet is wound around the central axis of the carbon nanotube sheet roll, wherein the carbon nanotube sheet is formed by combining a plurality of carbon nanotube bundles with one another through covalent bonding. According to an embodiment of the present invention, there is an effect in which an emitter which is structurally stable and can be stably used even at a high output may be provided.

Description

Carbon nanotube sheet roll emitter with improved structural stability, manufacturing method thereof, and field emission device using same

The present invention relates to a carbon nanotube emitter, and more particularly, to a carbon nanotube sheet roll emitter with improved structural stability by winding the carbon nanotube sheet to form a roll.

Field emission refers to a phenomenon in which electrons are quantum-mechanically tunneled as the potential barrier of the cathode surface becomes thin when an electric field is applied to the surfaces of two materials (anode and cathode) in a vacuum. At this time, in order to obtain an ultra-high current density by maximizing the field emission characteristics, it is essential to introduce an anode material having a nano structure, that is, a nano electron source. The field emission characteristics of the nanoelectron source show excellent properties as the structural anisotropy (Aspect Ratio) increases and the chemical stability increases.

Recently, carbon nanotubes (CNTs) have been spotlighted as emitters of such field emission devices. Carbon nanotube, a material in which two-dimensional graphene is rolled in a tube form, is an excellent nanoelectron source material optimized for the above requirements. It not only has a structure of a high aspect ratio, which is difficult to do, but also has great thermal and mechanical stability. Accordingly, when a voltage is applied at a distance, a high electric field is induced at the tip of the CNT, and quantum mechanical tunneling of electrons occurs very easily in response to this, so the CNT can be used as a high-performance electron source. there is.

Therefore, many studies are being conducted to implement a high-performance and stable field emission device using such carbon nanotubes.

In Korean Patent No. 10-1992745, structural stability and electron emission efficiency were improved by arranging carbon nanotube fibers (yarn) in parallel and pressing them to make a sheet, and then forming a tube shape to manufacture a field emission device. However, the tube-shaped field emission device is very weak because carbon nanotube fibers (yarn) are coupled to each other through π-π interaction, and is very vulnerable to repulsion by electrons generated at the tip of the field emission device. There was a problem that the area where electrons were emitted was reduced because the center of the was empty.

In order to solve the above problems, in Korean Patent No. 10-2099411, by using a tube-shaped holder, the carbon nanotube fibers arranged in parallel are repulsive to each other due to the repulsive force between the fibers due to electrons during emission. An attempt was made to further improve the structural stability of the emission device. However, since the carbon nanotube fibers exposed from the holder are still combined with a weak π-π interaction and their structure is weak with respect to the repulsive force between the fibers, there is a problem in that there is a limitation in forming the portion exposed from the holder to be long. .

<Prior art literature>

Republic of Korea Patent No. 10-1992745

Republic of Korea Patent No. 10-2099411

An object of the present invention is to provide a carbon nanotube sheet roll emitter that is structurally stable while solving the problems of the prior art and having excellent field emission characteristics, and a method for manufacturing the same.

Another object of the present invention is to provide a field emission device that is structurally stable and can be used stably even at high output.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. There will be.

In order to achieve the above technical problem, an embodiment of the present invention provides a carbon nanotube sheet roll emitter.

The carbon nanotube sheet roll emitter includes a carbon nanotube sheet roll on which a carbon nanotube sheet is wound around a central axis, wherein the carbon nanotube sheet is formed by bonding a plurality of carbon nanotube bundles to each other through a covalent bond. It may be characterized by

The plurality of carbon nanotube bundles of the carbon nanotube sheet may be characterized in that they are arranged with a certain directionality.

The central axis and the arrangement direction of the carbon nanotube bundles may be characterized in that they form an angle of -45° to 45°.

The carbon nanotube sheet roll may have a length of 1 μm to 1 m.

The carbon nanotube sheet roll may have a cross-sectional diameter of 1 μm to 30 cm.

The carbon nanotube sheet roll may be one in which a bent portion of the carbon nanotube sheet roll has a sharp tip.

In order to achieve the above technical object, another embodiment of the present invention provides a carbon nanotube sheet roll emitter.

The carbon nanotube sheet roll emitter may further include, in the carbon nanotube sheet roll emitter according to an embodiment of the present invention, a conductive member coupling part formed to surround the lower surface of the carbon nanotube sheet roll. may be doing

Alternatively, the carbon nanotube sheet roll emitter is wound together with the carbon nanotube sheet of the carbon nanotube sheet roll on the carbon nanotube sheet roll emitter according to an embodiment of the present invention to form the carbon nanotube sheet roll. It may be characterized by further comprising a; conductive member coupling portion formed surrounding the lower surface.

Of the total height of the carbon nanotube sheet roll emitter, the height of the remaining portions except for the height portion occupied by the conductive member coupling portion and the total height of the carbon nanotube sheet roll emitter have a length ratio of 1:5 to 9:10 It may be characterized by

The conductive member coupling part is in the form of a metal thin film or a metal wire including any one or more metals selected from the group consisting of tungsten, zinc, nickel, copper, silver, aluminum, gold, platinum, tin, and stainless steel. it could be

Alternatively, the conductive member coupling part may include an inorganic paste having conductive properties.

In order to achieve the above technical object, another embodiment of the present invention provides a method of manufacturing a carbon nanotube sheet roll emitter.

The manufacturing method of the carbon nanotube sheet roll emitter includes the steps of preparing a carbon nanotube sheet; and manufacturing the carbon nanotube sheet roll emitter by winding the prepared carbon nanotube sheet around a central axis to form a roll shape.

The carbon nanotube sheet may be characterized in that it is formed by bonding a plurality of carbon nanotube bundles to each other through a covalent bond.

In the step of preparing the carbon nanotube sheet, winding a sheet composed of carbon nanotube bundles to prepare a carbon nanotube sheet so that the carbon nanotube bundles have a certain direction; may be characterized in that it includes .

In the manufacturing of the carbon nanotube sheet roll emitter, the winding direction of the carbon nanotube sheet and the central axis may be manufactured to form an angle of -45° to 45°.

In the manufacturing of the carbon nanotube sheet roll emitter, the carbon nanotube sheet roll emitter is manufactured by placing a conductive member on the lower end of the carbon nanotube sheet and winding it together to form a roll shape. can

In order to achieve the above technical object, another embodiment of the present invention provides a field emission device.

The field emission device may include a carbon nanotube sheet roll emitter according to an embodiment of the present invention.

According to an embodiment of the present invention, it is possible to provide a carbon nanotube sheet roll emitter that has excellent field emission characteristics and is structurally stable, and a method for manufacturing the same.

In addition, according to an embodiment of the present invention, it is possible to provide a field emission device that is structurally stable and can be used stably even at a high output.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a schematic diagram schematically showing the structure of a carbon nanotube sheet roll emitter according to an embodiment of the present invention.

2 is a photograph showing the carbon nanotube sheet of the present invention.

3 is a schematic diagram schematically illustrating a rolling angle formed by a central axis of a carbon nanotube sheet roll emitter and an arrangement direction of carbon nanotube bundles according to an embodiment of the present invention.

4 is a schematic diagram schematically showing the structure of a carbon nanotube sheet roll emitter according to another embodiment of the present invention.

5 is a schematic diagram schematically showing the structure of a carbon nanotube sheet roll emitter according to another embodiment of the present invention.

6 is a flowchart schematically illustrating a method for manufacturing a carbon nanotube sheet roll emitter of the present invention.

7 is a diagram schematically illustrating a manufacturing process of a carbon nanotube sheet according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in several different forms, and thus is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be “connected (connected, contacted, coupled)” with another part, it is not only “directly connected” but also “indirectly connected” with another member interposed therebetween. "Including cases where In addition, when a part "includes" a certain component, this means that other components may be further provided, rather than excluding other components, unless otherwise stated.

The terminology used herein is used only to describe specific embodiments, and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A carbon nanotube sheet roll emitter according to an embodiment of the present invention will be described.

The term 'bundle' as used in the present invention, unless otherwise stated, means that units of a plurality of carbon nanotubes are arranged side by side in substantially the same orientation in the longitudinal direction of the units, or twisted after being arranged, or It refers to a secondary shape in the form of an entangled, bundle or rope.

1 is a schematic diagram schematically showing the structure of a carbon nanotube sheet roll emitter according to an embodiment of the present invention.

2 is a photograph showing the carbon nanotube sheet of the present invention.

1 and 2 , in the carbon nanotube sheet roll emitter 100 according to an embodiment of the present invention, the carbon nanotube sheet 10 is a carbon nanotube sheet wound around a central axis A. including rolls,

The carbon nanotube sheet 10 may be characterized in that a plurality of carbon nanotube bundles 11 are bonded to each other through a covalent bond.

As described above, conventional emitters using carbon nanotubes are composed of carbon nanotube fiber strands, and the carbon nanotube fibers have a combined form depending on the π-π interaction between the fiber strands. was done with

However, the π-π interaction is a weak bond, and there is a problem in that the bond is not sufficient to withstand the repulsive force between electrons emitted from the tip along the carbon nanotube fiber and to maintain the structural stability of the emitter.

Accordingly, the inventors of the present invention construct an emitter using a carbon nanotube sheet formed by tightly connecting carbon nanotube bundles to each other by a covalent bond, and roll the carbon nanotube sheet around a central axis to form a roll The carbon nanotube sheet roll emitter of the present invention was constructed to have

Due to the above configuration, the carbon nanotube sheet roll emitter of the present invention uses a sheet made of a carbon nanotube bundle connected by a covalent bond stronger than the conventional π bond, and thus has improved structural stability.

In addition, by forming the emitter by rolling the carbon nanotube sheet as described above in a roll shape, the structural stability of the carbon nanotube sheet was further maximized.

In this case, the plurality of carbon nanotube bundles 11 of the carbon nanotube sheet 10 may be characterized in that they are arranged with a certain directionality.

At this time, the angle formed by the positive direction of the central axis (A) corresponding to the longitudinal direction in which the carbon nanotube sheet roll emitter 100 is wound and the arrangement direction of the carbon nanotube bundles is a rolling angle (θ). ), the rolling angle θ may be characterized in that it has a value of -45° to 45°.

3 is a schematic diagram schematically illustrating a rolling angle θ formed between the central axis A of the carbon nanotube sheet roll emitter 100 and the arrangement direction of the carbon nanotube bundles 11 according to an embodiment of the present invention. am.

By adjusting the carbon nanotube bundles 11 to form a predetermined angle with the longitudinal direction of the carbon nanotube sheet roll emitter 100 as described above, the mechanical properties of the carbon nanotube sheet roll emitter 100 can be adjusted. can In more detail, as described above, the carbon nanotube bundles 11 are tilted to form a predetermined rolling angle θ, so that the carbon nanotube sheet roll emitter 100 responds better to the force acting in the lateral direction. It can be adjusted to withstand it.

In this case, the rolling angle θ preferably has a value of -45° to 45°.

When the rolling angle θ is less than -45° or has a value greater than 45°, the carbon nanotube bundles 11 in the field emission device are inclined too much with respect to the longitudinal direction of the field emission device. It is undesirable because the field emission effect from the tube end is reduced.

Accordingly, the rolling angle θ preferably has a value of -45° to 45°.

The carbon nanotube sheet roll may have a length (L) of 1 μm to 1 m.

Since the above-mentioned conventional emitters are made of thin and slender carbon nanotube fiber strands, structural stability deteriorates as the length increases, and thus there is a problem in that they cannot be formed to have a sufficient length.

However, in the carbon nanotube sheet roll emitter of the present invention, the carbon nanotube sheet for producing the emitter can be freely manufactured to have a desired size, thereby forming an emitter of a desired length, and also the carbon nanotube fiber strands Since the carbon nanotube sheet is structurally stable in a rolled form, it can be formed to have a sufficiently long length.

The carbon nanotube sheet roll may have a cross-sectional diameter (D) of 1 μm to 30 cm.

As described above, since conventional emitters are made of carbon nanotube fiber strands, there is a problem in that it is difficult to manufacture to have a sufficient cross-sectional diameter.

However, the carbon nanotube sheet roll emitter of the present invention may be formed to have a sufficient cross-sectional diameter by controlling the number of rolling of the carbon nanotube sheet.

A carbon nanotube sheet roll emitter according to another embodiment of the present invention will be described.

4 is a schematic diagram schematically showing the structure of a carbon nanotube sheet roll emitter according to another embodiment of the present invention.

Referring to FIG. 4 , the carbon nanotube sheet roll emitter 100 according to another embodiment of the present invention has a pointed tip 13 formed by bending the central portion of the carbon nanotube sheet 10 roll toward the top. Characterized in that, it may be characterized in that electrons are emitted from the tip (13).

The pointed end 13, which is a bent portion of the carbon nanotube sheet roll, is a side of the carbon nanotube sheet roll, that is, a portion corresponding to the sidewall of the carbon nanotube. Although the tip and sidewall of carbon nanotubes have a slight difference in work function, there is a significant difference in thermal stability. In addition, the tip of the carbon nanotube has a large field enhancement factor, so the electron emission voltage (turn-on voltage) is lower than that of the sidewall, but it has a characteristic that it is easily decomposed by heat because of its high activity. On the other hand, since the sidewall of the carbon nanotube has higher thermal stability than the tip, it has an advantage in terms of lifespan characteristics as a field emission device. Therefore, as described above, the carbon nanotube sheet roll emitter is formed in a bent form at the center and fixed on the substrate so that the sharp tip, which is the bent part, is facing up, so that the advantage of the sidewall of the carbon nanotube is utilized and the disadvantages are reduced. Available. Whether to use the carbon nanotube sheet roll by bending it as an emitter can be selected according to the current density and voltage to be used.

Due to the characteristics of the above configuration, according to an embodiment of the present invention, it is possible to provide a carbon nanotube sheet roll emitter that is structurally stable and has excellent field emission characteristics.

A carbon nanotube sheet roll emitter according to another embodiment of the present invention will be described.

5 is a schematic diagram schematically showing the structure of a carbon nanotube sheet roll emitter according to another embodiment of the present invention.

Referring to FIG. 5 , the carbon nanotube sheet roll emitter 100 is a conductive member formed in the carbon nanotube sheet roll emitter according to an embodiment of the present invention, surrounding the lower surface of the carbon nanotube sheet roll. The coupling portion 20; may be characterized in that it further includes.

Alternatively, the carbon nanotube sheet roll emitter 100 is wound together with the carbon nanotube sheet 10 of the carbon nanotube sheet roll on the carbon nanotube sheet roll emitter according to an embodiment of the present invention. The carbon nanotube sheet roll may be characterized in that it further includes a conductive member coupling portion 20 formed while surrounding the lower surface.

The carbon nanotube sheet 10 may be characterized in that a plurality of carbon nanotube bundles 11 are bonded to each other through a covalent bond.

In this case, the carbon nanotube sheet roll emitter 100 may be fixed to the substrate through the conductive member coupling part 20 or the emitter may be directly fixed to the substrate. The fixation to the substrate may be through conductive adhesive or welding. As an example, it is also possible to bond the emitter to a copper substrate through welding.

In this case, the carbon nanotube sheet roll emitter 100 may be fixed so that the central axis A is perpendicular to the substrate.

A cross-section of a portion of the carbon nanotube sheet roll emitter 100 in which the conductive member coupling portion 20 is formed may have a shape as shown in FIG. 5 .

At this time, among the total height of the carbon nanotube sheet roll emitter, the height (L1) of the remaining portion except for the height (L2) portion occupied by the conductive member coupling part 20 and the carbon nanotube sheet roll emitter (100) The total height (L) of may be characterized in that it has a length ratio of 1:5 to 9:10.

That is, the total height of the carbon nanotube sheet roll emitter 100 is L, the predetermined height formed by the conductive member coupling portion is L2, and the conductive member is combined among the entirety of the carbon nanotube sheet roll emitter 100 . If the height of the portion other than the predetermined portion formed by the addition is L1, L, L1, and L2 may be characterized in that they satisfy Equation 1 below.

[Equation 1]

1/5 ≤ L1/(L1+L2) ≤ 9/10

Even in the above-mentioned conventional invention, a configuration including a conductive holder for stably holding the structure of the emitter has been disclosed. However, as described above, since the conventional emitters have a structure made of carbon nanotube fiber strands, as the length of the portion exposed from the conductive holder increases, the structural stability deteriorates, so there was a problem that it could not be formed to have a sufficient length. .

However, in the present invention, a carbon nanotube sheet composed of a carbon nanotube bundle connected to each other by a covalent bond is formed in a roll shape to constitute a structurally stable emitter, so that the length of the portion exposed from the conductive member coupling portion is greater than the overall length. It has features that can be formed to have a sufficient length ratio of 1:5 to 9:10.

The conductive member coupling portion 20 is in the form of a metal thin film or a metal wire containing any one or more metals selected from the group consisting of tungsten, zinc, nickel, copper, silver, aluminum, gold, platinum, tin, and stainless steel. it could be

Alternatively, the conductive member coupling portion 20 may be made of an inorganic paste having conductive properties.

As the inorganic paste having the conductive property, a known conductive inorganic paste prepared including a metal, an inorganic reaction system, and an organic vehicle for imparting the conductive property may be used.

Due to the characteristics of the above configuration, according to an embodiment of the present invention, there is an effect that it is possible to provide a carbon nanotube sheet roll emitter that can be stably used without damage even at high output due to a stable coupling between the substrate and the emitter.

A method of manufacturing a carbon nanotube sheet roll emitter according to another embodiment of the present invention will be described.

6 is a flowchart schematically illustrating a method for manufacturing a carbon nanotube sheet roll emitter of the present invention.

Referring to FIG. 6 , the method of manufacturing a carbon nanotube sheet roll emitter of the present invention includes the steps of preparing a carbon nanotube sheet (S100); and manufacturing a carbon nanotube sheet roll emitter by winding the prepared carbon nanotube sheet around a central axis to form a roll (S200).

The carbon nanotube sheet may be characterized in that it is formed by bonding a plurality of carbon nanotube bundles to each other through a covalent bond.

7 is a diagram schematically illustrating a manufacturing process of a carbon nanotube sheet according to an embodiment of the present invention.

Referring to FIG. 7 , in the step of preparing the carbon nanotube sheet ( S100 ), the carbon nanotube is wound on the aggregate so that the carbon nanotube bundles 11 have a constant direction to prepare the carbon nanotube sheet 10 . to do; and preparing a carbon nanotube sheet by cutting the formed carbon nanotube sheet 10 by a desired predetermined length.

More specifically, in order to first synthesize the carbon nanotube sheet, a raw material solution composed of a carbon source, a catalyst, and a cocatalyst may be synthesized while being supplied into a high-temperature synthesis furnace together with a transport gas. As the carbon source, an organic solvent such as acetone, ethanol and butanol is mainly used, and metallocene such as ferrocene and nickellocene is used as a catalyst, and thiophene is used as a cocatalyst (Thiophene) or carbon disulfide (CS2) can be used. The composition of the raw material solution for synthesizing the carbon nanotubes may vary depending on the carbon nanotubes to be manufactured. In general, ferrocein may be in a ratio of 0.1 to 4.0 wt%, and thiophene in a ratio of 0.05 to 3.0 wt%. The transport gas fed together is hydrogen or nitrogen gas, 300 to 4,000 sccm, and the temperature of the electric furnace may be synthesized in the range of 800 to 1500 degrees. By continuously winding the carbon nanotube aggregate synthesized under these conditions, it is possible to prepare a carbon nanotube sheet in which the carbon nanotube bundles have a certain directionality.

In the step (S200) of manufacturing the carbon nanotube sheet roll emitter, the orientation direction of the carbon nanotube bundle and the central axis may be manufactured to form an angle of -45° to 45°.

By adjusting the winding direction in which the carbon nanotube bundle is wound to form a predetermined angle with the central axis of the carbon nanotube sheet roll emitter as described above, the mechanical properties of the carbon nanotube sheet roll emitter can be adjusted. . More specifically, as described above, the carbon nanotube bundles are tilted and rolled at a predetermined rolling angle, so that the carbon nanotube sheet roll emitter can be adjusted to better withstand the force acting in the lateral direction.

In this case, the angle preferably has a value of -45° to 45°.

When the angle is less than -45° or has a value greater than 45°, the carbon nanotube bundles in the field emission device are inclined too much in the longitudinal direction, so that the field emission effect from the end of the carbon nanotube is reduced. don't

Accordingly, the angle preferably has a value of -45° to 45°.

In the step of manufacturing the carbon nanotube sheet roll emitter (S200), a conductive material is placed on the lower end of the carbon nanotube sheet and then wound together to manufacture the carbon nanotube sheet roll emitter.

The conductive material may be wound together with the sheet in the form of a metal thin film or metal wire to form the emitter,

Alternatively, the emitter may be formed by being applied on the carbon nanotube sheet in the form of a conductive inorganic paste and then wound together with the sheet.

Due to the characteristics of the above configuration, according to an embodiment of the present invention, it is possible to provide a method for manufacturing a carbon nanotube sheet roll emitter that is structurally stable and can be used even at high output while having high field emission characteristics.

A field emission device according to another embodiment of the present invention will be described.

The field emission device may include a carbon nanotube sheet roll emitter according to an embodiment of the present invention.

More specifically, the field emission device may include: a substrate; and a carbon nanotube sheet roll emitter positioned on the substrate.

In this case, the carbon nanotube sheet roll emitter may be a carbon nanotube sheet roll according to an embodiment of the present invention.

The carbon nanotube sheet roll emitter may be fixed on the substrate through a conductive material, and more specifically, may be coupled through a conductive adhesive or welding so that the central axis is perpendicular to the substrate.

Alternatively, when the substrate is made in the form of a mesh network, the carbon nanotube sheet roll emitter is threaded between the nets of the substrate to intersect with the net of the substrate or welded, and then to the upper surface of the substrate. A field emission device may be formed by cutting the exposed carbon nanotube sheet roll emitter into a plane parallel to the upper surface to expose a cross-section.

Due to the characteristics of the above configuration, according to an embodiment of the present invention, it is possible to provide a field emission device that is structurally stable and can be used stably even at a high output.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

<Explanation of code>

100: carbon nanotube sheet roll emitter

10: carbon nanotube sheet

11: Carbon nanotube bundle

20: conductive member coupling portion

Claims (16)

A carbon nanotube sheet comprising a carbon nanotube sheet roll wound around a central axis, The carbon nanotube sheet is a carbon nanotube sheet roll emitter with improved structural stability, characterized in that it is formed by bonding a plurality of carbon nanotube bundles to each other through a covalent bond. The method of claim 1, The carbon nanotube sheet roll emitter with improved structural stability, characterized in that the plurality of carbon nanotube bundles of the carbon nanotube sheet are arranged with a certain directionality. 3. The method of claim 2, The carbon nanotube sheet roll emitter with improved structural stability, characterized in that the central axis and the arrangement direction of the carbon nanotube bundles form an angle of -45° to 45°. According to claim 1, The carbon nanotube sheet roll emitter with improved structural stability, characterized in that the length of the carbon nanotube sheet roll is 1 μm to 1 m. According to claim 1, The carbon nanotube sheet roll emitter with improved structural stability, characterized in that the cross-sectional diameter is 1 μm to 30 cm. According to claim 1, The carbon nanotube sheet roll emitter with improved structural stability, characterized in that the portion bent by bending the carbon nanotube sheet roll has a sharp tip. According to claim 1, A carbon nanotube sheet roll emitter with improved structural stability, characterized in that it further comprises; a conductive member coupling portion formed to surround the lower surface of the carbon nanotube sheet roll. According to claim 1, The carbon nanotube sheet roll emitter with improved structural stability further comprising a; a conductive member coupling part wound together with the carbon nanotube sheet of the carbon nanotube sheet roll to surround the lower surface of the carbon nanotube sheet roll. 8. The method of claim 7, Among the total height of the carbon nanotube sheet roll emitter, the height of the remaining portions except for the height portion occupied by the conductive member coupling portion and the total height of the carbon nanotube sheet roll emitter have a length ratio of 1:5 to 9:10 Carbon nanotube sheet roll emitter with improved structural stability, characterized in that. 8. The method of claim 7, The conductive member coupling part is in the form of a metal thin film or a metal wire including any one or more metals selected from the group consisting of tungsten, zinc, nickel, copper, silver, aluminum, gold, platinum, tin and stainless steel. Carbon nanotube sheet roll emitter with improved structural stability. 8. The method of claim 7, The carbon nanotube sheet roll emitter with improved structural stability, characterized in that the conductive member coupling portion includes an inorganic paste having conductive properties. Preparing a carbon nanotube sheet characterized in that a plurality of carbon nanotube bundles are bonded to each other through a covalent bond; and Manufacturing the carbon nanotube sheet roll emitter with improved structural stability, comprising the step of manufacturing the carbon nanotube sheet roll emitter by winding the prepared carbon nanotube sheet around a central axis to form a roll shape. 13. The method of claim 12, In the step of preparing the carbon nanotube sheet, the carbon nanotube aggregate is wound to prepare a carbon nanotube sheet so that the carbon nanotube bundles have a constant winding direction; carbon with improved structural stability, comprising: A method for manufacturing a nanotube sheet roll emitter. 14. The method of claim 13, In the manufacturing of the carbon nanotube sheet roll emitter, the carbon nanotube with improved structural stability, characterized in that the winding direction of the carbon nanotube aggregate and the central axis form an angle of -45° to 45° A method for manufacturing a sheet roll emitter. 13. The method of claim 12, In the manufacturing of the carbon nanotube sheet roll emitter, the carbon nanotube sheet roll emitter is manufactured by placing a conductive member on the lower end of the carbon nanotube sheet and winding it together to form a roll shape. A method for manufacturing a carbon nanotube sheet roll emitter with improved stability. A field emission device comprising the carbon nanotube sheet roll emitter according to claim 1 .

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