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KR20160120967A - Electro-spinning apparatus using drum collector and method of manufacturing a transparent electrode using the same - Google Patents

Electro-spinning apparatus using drum collector and method of manufacturing a transparent electrode using the same Download PDF

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Publication number
KR20160120967A
KR20160120967A KR1020150050247A KR20150050247A KR20160120967A KR 20160120967 A KR20160120967 A KR 20160120967A KR 1020150050247 A KR1020150050247 A KR 1020150050247A KR 20150050247 A KR20150050247 A KR 20150050247A KR 20160120967 A KR20160120967 A KR 20160120967A
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KR
South Korea
Prior art keywords
drum collector
transparent electrode
nanofibers
spinning nozzle
collector
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KR1020150050247A
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Korean (ko)
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KR101689740B1 (en
Inventor
박장웅
현병관
지상윤
안병완
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울산과학기술원
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Priority to KR1020150050247A priority Critical patent/KR101689740B1/en
Priority to PCT/KR2016/002447 priority patent/WO2016163651A1/en
Publication of KR20160120967A publication Critical patent/KR20160120967A/en
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Publication of KR101689740B1 publication Critical patent/KR101689740B1/en

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/0007—Electro-spinning
    • D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82B—NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
    • B82B3/00—Manufacture or treatment of nanostructures by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/0007—Electro-spinning
    • D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
    • D01D5/0092—Electro-spinning characterised by the electro-spinning apparatus characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nanotechnology (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonwoven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

An electrospinning apparatus according to the present invention can manufacture a transparent electrode made of nanofiber having directivity since the nanofiber can be aligned in a predetermined direction by electrically spinning the nanofiber on a rotary drum collector. In addition, a jet from a spinning nozzle can concentrate by installing an auxiliary electrode within the drum collector, and thus the alignment of the nanofiber can be enhanced. Additionally, since the transparent electrode can be manufactured using a grid pattern nanofiber, the surface roughness and density of the transparent electrode can be accurately controlled. In addition, the grid pattern transparent electrode with flexibility and elasticity can be provided by a simple and economical process and a flexible display device or an elastic display device can be easily formed using the transparent electrode. Additionally, the process is very simple and economical since coaxial dual-layer fiber is formed by spinning a nanomolecular compound and a macromolecular compound together and the transparent electrode can be provided by removing the macromolecular compound.

Description

TECHNICAL FIELD The present invention relates to an electrospinning apparatus using a drum collector and a method of manufacturing a transparent electrode using the same.

The present invention relates to an electrospinning apparatus using a drum collector and a method of manufacturing a transparent electrode using the same, and more particularly, to a method of manufacturing an electrospinning apparatus using a drum collector capable of manufacturing a coaxial double- An electrospinning device, and a method of manufacturing a transparent electrode using the electrospinning device.

Due to the recent development of smart electronic devices, studies are being made on a flexible display device or a stretchable display device that replaces a conventional solid display device. A transparent electrode having transparency is required for a display device, and indium tin oxide (ITO) has been conventionally used. However, such indium tin oxide is difficult to apply to flexible display devices due to low flexibility and low elasticity.

In order to overcome the limitations of such indium main line oxides, transparent electrodes using other materials, for example, graphene or silver nanowires, have been developed. However, research results to date show that transparent electrodes using graphene or silver nanowire have complicated processes, low reliability of the products, and high cost.

Korean Patent No. 10-1197986

An object of the present invention is to provide an electrospinning apparatus using a drum collector capable of manufacturing a transparent electrode having a grid pattern with flexibility and stretchability in a simple and economical process, and a method of manufacturing a transparent electrode using the electrospinning apparatus.

An electrospinning apparatus using a drum collector according to the present invention includes an inner nozzle to which a voltage is applied and radiates at least one of a nano material and a polymer material, A spinning nozzle for spinning nanofibers comprising a nanomaterial layer formed of the nanomaterial and a polymer material layer formed of the polymer material, the nanofibers including a coaxial double layer; A drum collector on which the nanofibers are collected from the spinning nozzle; And a rotating mechanism for rotating the drum collector to align the nanofibers emitted from the spinning nozzle in a predetermined alignment direction in the drum collector.

A method of manufacturing a transparent electrode using an electrospinning device using a drum collector according to the present invention includes the steps of applying a voltage to a spinneret to form a nanomaterial layer formed of a nanomaterial and a polymer material layer formed of a polymer material, Emitting nanofiber; Grounding the drum collector disposed opposite the spinneret or applying a voltage opposite to the spinneret; Rotating the drum collector at a predetermined set rotational speed so that nanofibers emitted from the spinneret are aligned in a predetermined alignment direction; And removing the polymer material from the nanofibers to form a transparent electrode composed of the nanomaterial.

According to another aspect of the present invention, there is provided a method of manufacturing a transparent electrode using an electrospinning device using a drum collector, the method comprising: applying a voltage to a spinneret to cause the spinneret to form a nanomaterial layer formed of a nanomaterial and a polymer material layer Spinning nanofibers made of this coaxial double layer; Providing an auxiliary electrode inside the drum collector arranged to face the spinning nozzle and grounding the auxiliary electrode or applying a voltage opposite to the spinning nozzle to the auxiliary electrode; Rotating the drum collector at a predetermined set rotational speed so that nanofibers emitted from the spinneret are aligned in a predetermined alignment direction; And removing the polymer material from the nanofibers to form a transparent electrode composed of the nanomaterial.

In the electrospinning apparatus according to the present invention, since the nanofibers can be aligned in a certain direction by electrospinning the nanofibers to the rotating drum collector, a transparent electrode made of directional nanofibers can be manufactured.

In addition, since auxiliary electrodes are provided inside the drum collector to concentrate the jet emitted from the spinning nozzle, the degree of alignment of the nanofibers can be further improved.

Further, since the transparent electrode using the nanofibers of the grid pattern can be produced, the surface roughness and density of the transparent electrode can be precisely controlled.

In addition, it is possible to provide a transparent electrode having a grid pattern having flexibility and stretchability by a simple and economical process, and the flexible display device or the flexible display device can be easily realized using the transparent electrode.

Further, since the co-axial double-layer fiber is formed by spinning the nanomaterial and the polymer material together, and the polymer material is removed to provide the transparent electrode, the process is very simple and economical.

1 is a view showing an electrospinning apparatus according to an embodiment of the present invention.
2 is an enlarged cross-sectional view of the spinning nozzle shown in Fig.
3 is an enlarged perspective view of a nanofiber formed as a coaxial double layer by the spinning nozzle shown in FIG.
4 is a flowchart showing a method of manufacturing a transparent electrode using an electrospinning device according to an embodiment of the present invention.
5 is a schematic diagram illustrating the nanofiber crossing method shown in FIG.
6 is a view showing an electrospinning device according to another embodiment of the present invention.

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

1 is a view showing an electrospinning apparatus according to an embodiment of the present invention. 2 is an enlarged cross-sectional view of the spinning nozzle shown in Fig. 3 is an enlarged perspective view of a nanofiber formed as a coaxial double layer by the spinning nozzle shown in FIG.

1, an electrospinning device 1 according to an embodiment of the present invention includes a spinning nozzle 10, a drum collector 20, a power supply unit 46, a rotating mechanism 30, and a moving mechanism .

The spinning nozzle 10 is connected to a spinning solution tank 40 and a syringe pump (not shown).

The spinning solution tank 40 stores a spinning solution for spinning. The spinning solution comprises a nanomaterial and a polymeric material. The spinning solution tank 40 includes a nanomaterial tank 41 including the nanomaterial having conductivity and a polymer material tank 42 including the polymer material.

The nanomaterial layer 51 formed from the nanomaterial and the nanomaterial may be composed of various nanoparticles and may include nanoparticles, nanowires, nanotubes, nano- And may include at least one selected from the group consisting of a nanorod, a nanowall, a nanobelt, and a nanorring.

The nanomaterial and nanomaterial layer 51 may include nanoparticles such as copper, silver, gold, copper oxide, cobalt, and the like. The nanomaterial and nanomaterial layer 51 may include nanowires such as copper nanowires, silver nanowires, gold nanowires, and cobalt nanowires.

Also, the nanomaterial and the nanomaterial layer 51 may be composed of a nanomaterial solution in which the nanomaterial is dissolved in a soluble solvent such as methanol, acetone, tetrahydrofuran, toluene, or dimethylformamide. For example, the soluble solvent may be selected from the group consisting of Alkanes such as hexane, Aromatics such as toluene, ethers such as diethyl ether, chloroform, Such as alkyl halides, such as Alkyl halides, Esters, Aldehydes, Ketones, Amines, Alcohols, Amides, Carboxylic acids, Carboxylic acids, and water. In addition, for example, the nanomaterial solution can be formed using the organic solvent described below. However, the nanomaterials are illustrative, and the technical idea of the present invention is not limited thereto.

The polymer material layer 52 formed from the polymer material and the polymer material is a polymer solution including various polymer materials. The polymeric material may be selected from the group consisting of polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), polymethyl methacrylate (PMMA), polydimethylsiloxane (PDMS), polyurethane, polyether urethane, cellulose acetate, cellulose acetate butyl (PMA), polyvinyl acetate (PVAc), polyacrylonitrile (PAN), polyperfuryl alcohol (PPFA), polystyrene, polyethylene oxide (PEO), polypropylene oxide (PPO), polycarbonate (PC), polyvinyl chloride (PVC), polycaprolactone, polyvinyl fluoride, and polyamide.

In addition, the polymer material and the polymer material layer 52 may include a copolymer of the above-described materials, and examples thereof include a polyurethane copolymer, a polyacrylic copolymer, a polyvinyl acetate copolymer, a polystyrene copolymer, Polyethylene oxide copolymer, polypropylene oxide copolymer, and polyvinylidene fluoride copolymer. [0033] The term " copolymer "

The polymer material and the polymer material layer 52 may be composed of a polymer solution in which the above polymer material is dissolved in a soluble solvent such as methanol, acetone, tetrahydrofuran, toluene, or dimethylformamide. For example, the soluble solvent may be selected from the group consisting of Alkanes such as hexane, Aromatics such as toluene, ethers such as diethyl ether, chloroform, Such as alkyl halides, such as Alkyl halides, Esters, Aldehydes, Ketones, Amines, Alcohols, Amides, Carboxylic acids, Carboxylic acids, and water. However, such a polymer solution is illustrative, and the technical idea of the present invention is not limited thereto.

Referring to FIG. 2, the spinning nozzle 10 receives the nanomaterial and the polymer material from the spinning solution tank 10, and radiates the spinning nozzle through a spinning nozzle tip 10a located at the end. The spinning nozzle 10 includes an inner nozzle 11 for radiating at least one of the nanomaterial and the polymer material and a spinneret 11 surrounding the inner nozzle 11, And an outer nozzle 12 that emits radiation. In this embodiment, the inner nozzle 11 is connected to the nanomaterial tank 41 to emit the nanomaterial supplied from the nanomaterial tank 41, and the outer nozzle 12 is connected to the polymer material The polymer material tank 42 is connected to the polymer material tank 42 and the polymer material supplied from the polymer material tank 42 is radiated. That is, since the spinning nozzle 10 has a coaxial double cylinder structure, the nanomaterial and the polymer material can be radiated together without being mixed. Accordingly, the spinning nozzle 10 can spin the nanomaterial layer 51 formed of the nanomaterial and the polymer material layer 52 formed of the polymer material to form a coaxial double layer structure. However, the present invention is not limited to this, and the nanomaterial layer 51 and the polymer material layer 52 may have a double-tube structure and may not have a coaxial structure.

The syringe pump (not shown) pumps the spinning solution filled in the spinning nozzle 10. In the present embodiment, the spinning nozzle 10 is shaped like a syringe, and the syringe pump (not shown) presses the piston of the syringe. A pump (not shown) is built in the spinning solution tank 40 so as to press the spinning solution in the spinning solution tank 40 from the spinning solution tank 40 to the spinning nozzle 10 It is also possible to provide a spinning solution.

The drum collector 20 is arranged to face the spinning nozzle 10 and is rotated by a rotation mechanism described later. The drum collector 20 is formed in a drum shape, and an integrated substrate 21 on which the nanofibers 50 radiated from the spinning nozzle 10 are accumulated is attached to the surface of the drum collector 20. In this embodiment, the integrated substrate 21 is a plate-shaped substrate. However, the present invention is not limited thereto, and a free standing substrate which does not support the lower side of the object to be integrated may be used. It may be formed in a frame shape in which a central portion is penetrated. The method further comprises a step of separating the nanofibers irradiated and aligned on the integrated substrate when the free standing substrate is used, from the integrated substrate and transferring the separated nanofibers to a separate substrate.

The power supply unit 46 is an external power source for applying a voltage to the spinning nozzle 10 or the drum collector 20. A voltage is applied to the spinning nozzle 10 by the external power source 46 and the drum collector 20 is grounded or a voltage opposite to the spinning nozzle 10 is applied. In the present embodiment, when the voltage is DC and a positive voltage is applied to the spinning nozzle 10, the drum collector 20 generates a negative voltage, which is opposite to the spinning nozzle 1, For example, the following description will be given. Therefore, a voltage difference is generated between the spinneret 10 and the drum collector 20. However, the present invention is not limited to this, and it is of course possible to use alternating current (AC) as the voltage. When the alternating current is used, the spinning nozzle 10 and the drum collector 20 are controlled to have voltages opposite to each other.

When the positive voltage is applied to the spinning nozzle 10 by the power supply unit 46, the drum collector 20 is grounded or a negative voltage, which is opposite to that of the spinning nozzle 1, is applied. Therefore, a voltage difference is generated between the spinneret 10 and the drum collector 20.

The rotating mechanism is a mechanism for rotating the drum collector 20. The rotating mechanism includes a rotating shaft 22 connected to the drum collector 20 and a motor 30 connected to the rotating shaft 22. The rotary shaft 22 is connected to both sides of the drum collector 20. A support base (23) is provided to support at least one of the rotation shaft (22) and the motor (30). The support table 23 is formed in a rod shape provided in a vertical direction. A base 24 is provided below the support table 23. However, the present invention is not limited to this, and the rotating mechanism can be any mechanism that can rotate the drum collector 20.

The rotating mechanism rotates the slurry drum collector 20 to rotate the nanofibers 50 radiated from the spinning nozzle 10 in the alignment direction A of the nanofibers 50 previously set in the drum collector 20 ). The alignment direction A may be the same as the rotation direction R of the drum collector 20 or be inclined at a predetermined alignment angle from the rotation direction R. [ In the present embodiment, the alignment direction A is the same as the rotation direction R of the drum collector 20, for example. When the alignment direction A is set to be inclined at a predetermined alignment angle with respect to the rotation direction R, the alignment angle may be determined by the radiation angle? Of the spinneret 10, Can be set based on the linear movement speed of the drum collector (20). Here, the radiation angle? Of the spinning nozzle 10 indicates an angle at which the spinning nozzle 10 is tilted with respect to the vertical direction. The alignment angle may be set based on the rotation speed of the drum collector 20 and the linear movement speed when the rotation and linear movement of the drum collector 20 are simultaneously performed.

The moving mechanism (not shown) linearly moves at least one of the spinning nozzle 10 and the drum collector 20 in the direction of the rotation axis 22. The moving mechanism (not shown) moves at least one of the spinning nozzle 10 and the drum collector 20 so that the nanofibers radiated from the spinning nozzle 10 and aligned in the aligning direction move along the rotation axis 22 in the X direction. In the present embodiment, the drum collector 20 is moved, and the base 24 is linearly moved to linearly move the drum collector 20. The moving mechanism (not shown) may have a variety of structures such as a rack, a pinion structure, and a sliding rail structure. Any device capable of linearly moving the drum collector 20 in the direction of the rotation axis 22 It is possible.

The pitch of the nanofibers arranged in the direction of the rotation axis 22 can be set based on the radiation angle of the spinning nozzle 10 and the linear movement speed of the drum collector 20 have. The pitch of the nanofibers can be increased as the spinning angle (?) Of the spinning nozzle (10) increases. Also, if the linear movement speed of the drum collector 20 is increased, the pitch of the nanofibers can be increased. Therefore, when setting the pitch of the nanofibers, the linear movement speed of the drum collector 20 and the spinning angle (?) Of the spinning nozzle 10 are set together.

4 is a flowchart showing a method of manufacturing a transparent electrode using an electrospinning device according to an embodiment of the present invention. 5 is a schematic diagram illustrating the nanofiber crossing method shown in FIG.

4 and 5, a method of manufacturing a transparent electrode using an electrospinning device according to an embodiment of the present invention will now be described.

First, a voltage is applied to the spinning nozzle 10 to spin the nanomaterial and the polymer material together from the spinning nozzle 10. (S10) In this embodiment, the spinning angle of the spinning nozzle 10 (0) is 0 degree, for example. That is, the nanomaterial and the polymer material are radiated in the vertical direction (-Y) in the spinning nozzle 10.

The voltage may vary depending on the type of the spinning solution, the type of the integrated substrate 20, the process environment, and the like, and may range from about 100 V to 30000 V. The nanomaterial and the polymeric material may be simultaneously emitted and may have the same emission length.

The polymer material in the outer nozzle 12 of the spinning nozzle 10 is radiated into a hollow cylinder shape and the nanomaterial in the inner nozzle 11 is discharged while being filled in the polymer material, And solidified into the nanofibers 50 having a bilayer structure. 3A, the nanofibers 50 emitted from the spinning nozzle 10 have a coaxial double layer structure composed of the polymer material layer 52 and the nanomaterial layer 51. At this time, the nanomaterial and the polymer material are not mixed with each other. It is preferable that the spinning speed of the polymer material is equal to or larger than the spinning speed of the nanomaterial. The polymer material and the nanomaterial should have the same or similar vapor pressure. In addition, the viscosity of the polymer material should be equal to or greater than the viscosity of the nanomaterial.

On the other hand, a voltage opposite to that of the spinning nozzle 10 is applied to the drum collector 20, and the drum collector 20 is rotated at a predetermined set rotation speed and linearly moved at a predetermined linear movement speed. (S12)

When the drum collector 20 is rotated at the set rotation speed, nanofibers emitted from the spinning nozzle 10 are formed in a predetermined alignment direction A. In the present embodiment, the alignment direction A is the same as the rotation direction R of the drum collector 20, for example. The set rotation speed may be set in consideration of the diameter of the nanofibers.

When the strands of the nanofibers 50 are aligned in the alignment direction A, the drum collector 20 is linearly moved in the direction of the rotation axis 22 by a predetermined distance. When the drum collector 20 is linearly moved in the direction of the rotation axis 22, the nanofibers can be aligned and arranged at positions spaced apart from the already aligned nanofibers. In this way, the plurality of nanofibers 50 may be arranged in the alignment direction A, and may be arranged in a plurality of rows spaced or overlapped with each other in the direction X of the rotation axis 22. As described above, in the present embodiment, the drum collector 20 is rotated to linearly move the drum collector 20 after a certain number of strands of the nanofibers 50 are aligned in the alignment direction A For example, the drum collector 20 may be linearly moved while the drum collector 20 is rotated.

Referring to FIG. 5, the alignment direction of the nanofibers 50 may be changed to form a desired pattern such as a grid structure. In this embodiment, a grid structure is formed by intersecting a plurality of nanofibers. (S14)

5B, when the first nanofiber layer 61 is formed by aligning the plurality of nanofibers 50 in the alignment direction A, the first nanofiber layer 61 is formed from the drum collector 20, The 1-nano fiber layer 61 is removed. 5C, the removed first nanofiber layer 61 is rotated at a predetermined crossing angle. In this embodiment, the crossing angle is 90 degrees, for example. The first nanofiber layer 61 is rotated at an angle of 90 degrees so that the nanofibers of the first nanofiber layer 61 are arranged in a direction perpendicular to the alignment direction A, . 5D, the nanofibers 50 are irradiated from the spinneret 10 onto the first nanofiber layer 61 while the drum collector 20 is rotated and linearly moved. 5E, a second nanofiber layer 62 is formed on the first nanofiber layer 61 so as to cross the first nanofiber layer 61 at 90 degrees. Thus, a nanofiber layer 60 having a grid structure is formed.

When the nanofiber layer 60 of the grid structure is formed on the integrated substrate 21, annealing is performed. The annealing may increase the bonding force between the nanomaterials in the nanomaterial layer 51. The annealing may be performed in a temperature range in which the integrated substrate 21 is not damaged. The anneal may be performed at a temperature in the range of, for example, about 20 캜 to about 500 캜, and may be performed at a temperature in the range of, for example, about 20 캜 to about 300 캜. The annealing may be performed in an air atmosphere, an inert atmosphere containing argon gas or nitrogen gas, or a reducing atmosphere containing hydrogen gas. The annealing is optional and may be omitted. (S15)

Thereafter, the polymer material layer 52 is removed to form a transparent electrode composed only of the nanomaterial layer 51. (S16) (S17) The polymer material layer 52 is removed by using an organic solvent can do. The organic solvent may include all kinds of solvents capable of dissolving the polymer material layer 52. The organic solvent may be selected from the group consisting of Alkanes such as hexane, Aromatics such as toluene, ethers such as diethyl ether, alkyl halides such as chloroform, Alkyl halides, Esters, Aldehydes, Ketones, Amines, Alcohols, Amides, Carboxylic acids, Carboxylic acids, And water. The organic solvent may be, for example, acetone, fluoroalkanes, pentanes, hexane, 2,2,4-trimethylpentane, decane Decene, cyclohexane, cyclopentane, diisobutylene, 1-pentene, carbon disulfide, carbon tetrachloride, 1- Examples of the solvent include chlorobutane, 1-chloropentane, xylene, diisopropyl ether, 1-chloropropane, 2-chloropropane, ), Toluene (Toluene), Chlorobenzene, Benzene, Bromoethane, Diethyl ether, Diethyl sulfide, Chloroform, Dichloromethane Dichloromethane, 4-Methyl-2-propanone, Tetrahydrofuran, 1,2-Dichloroethane, 2- But are not limited to, 2-butanone, 1-nitropropane, 1,4-dioxane, ethyl acetate, methyl acetate, 1-pentanol, dimethyl sulfoxide, aniline, diethylamine, nitromethane, acetonitrile, pyridine, 2-butoxyethanol (2- Butoxyethanol, 1-propanol and 2-propanol), ethanol, methanol, ethylene glycol, and acetic acid. And may include at least any one of them.

However, the present invention is not limited to this, and the polymer material layer 52 may be removed by reactive ion etching. Referring to FIG. 3, it can be confirmed by comparing before and after the removal of the polymer material layer. Referring to FIG. 3B, when the polymer material layer 52 is removed, only the nanomaterial layer 51 is left, and the transparent electrode is made of the nanomaterial layer 51 only. The nanomaterial layer 51 is rod-shaped.

The transparent electrode may further include a transparent conductive layer (not shown) formed on the nanomaterial layer 51. The transparent conductive layer may include a transparent material and may include a conductive material. The transparent conductive layer can reduce the electrical resistance of the transparent electrode and realize an electrode that applies more current more uniformly. The transparent conductive layer may cover the transparent electrode, and the nanomaterial layer 51 may be shielded from external air to prevent oxidation. The transparent conductive layer may include a conductive two-dimensional nanomaterial layer. The two-dimensional nanomaterial layer may be composed of two-dimensional nanomaterials and may include carbon nanomaterials such as graphene, graphite, or carbon nanotubes. The meaning of the two-dimensional nanomaterial means that the nanomaterial has a planar shape, for example, a shape such as a sheet.

Alternatively, the nanofibers 50 may be radiated so that the nanomaterial layer formed from the nanomaterial is surrounded by the polymer material layer. When the polymer material layer is removed, It is also possible that a transparent electrode made of a layer is formed.

6 is a view showing an electrospinning device according to another embodiment of the present invention.

6, an electrospinning apparatus according to another embodiment of the present invention includes a spinning nozzle 110, a drum collector 120, a power supply 146, an auxiliary electrode 160, a rotating mechanism, and a moving mechanism And the auxiliary electrode 160 is provided in the drum collector 120 so as to be linearly movable. Therefore, the different structures will be described in detail.

The auxiliary electrode 160 is installed inside the drum collector 120. The auxiliary electrode 160 may be grounded or a voltage opposite to that of the spinneret 110 may be applied to generate a voltage difference with the spinneret 110.

The moving mechanism (not shown) is a mechanism for linearly moving the auxiliary electrode 160 in the direction X of the rotation axis 122 of the drum collector 120. The moving mechanism moves the rod 132 connected to the auxiliary electrode 160. The rod 132 is installed to penetrate the inside of the drum collector 120 and the rotation shaft 122. The rod 132 is connected to the drum collector 120, And may be exposed to the outside through the outer peripheral surface to be connected to the moving mechanism (not shown). The moving mechanism (not shown) may have various structures such as a rack, a pinion structure, and a sliding rail structure, and any device capable of linearly moving the rod 132 is possible. It is also possible that the moving mechanism (not shown) is directly connected to the auxiliary electrode 16.

The nanofibers emitted from the spinning nozzle 110 are radiated between the spinning nozzle 110 and the auxiliary electrode 160 so that when the auxiliary electrode 160 is moved, The position can be moved. Accordingly, the nanofibers aligned in the alignment direction A may be formed in a plurality of rows in the direction of the rotation axis 122 by being radiated from the spinneret 110 in accordance with the linear movement of the auxiliary electrode 160.

The rotating mechanism includes a rotating shaft 122 connected to the drum collector 120 and a motor 130 connected to the rotating shaft 122. The rotation shaft 122 and the motor 130 are supported by a support 123 and a base 124 is installed below the support 123. Reference numeral 121 denotes an integrated substrate attached to the surface of the drum collector 120.

A method of manufacturing a transparent electrode using the electrospinning device according to the second embodiment of the present invention will now be described.

First, a voltage is applied to the spinning nozzle 110 to spin the nanomaterial and the polymer material from the spinning nozzle 110. In the present embodiment, the radiation angle? Of the spinning nozzle 110 is 0 degree, for example. That is, the nanomaterial and the polymer material are radiated in the vertical direction (-Y) in the spinning nozzle 110. The polymer material in the outer nozzle of the spinning nozzle 110 is radiated into a hollow cylinder shape, and the nanomaterial in the inner nozzle is discharged while being filled in the polymer material, And solidified into fibers 150.

On the other hand, a voltage opposite to the spinning nozzle 110 is applied to the auxiliary electrode 160, and the drum collector 120 is rotated at a preset rotation speed.

When the drum collector 120 is rotated at the set rotation speed, nanofibers radiated from the spinneret 110 are formed in a predetermined alignment direction (A). In the present embodiment, the alignment direction A is the same as the rotation direction R of the drum collector 120, for example. The set rotation speed may be set in consideration of the diameter of the nanofibers.

When the nanofibers 150 are aligned in the alignment direction A, the auxiliary electrode 160 is linearly moved in the direction of the rotation axis 122 by a predetermined distance. When the auxiliary electrode 160 is linearly moved in the direction of the rotation axis 122, the nanofibers may be arranged in a position spaced apart from the already aligned nanofibers by a predetermined distance. In this way, the plurality of nanofibers 150 may be arranged in the alignment direction A, and may be arranged in a plurality of rows spaced or overlapped with each other in the direction X of the rotation axis 122. As described above, in the present embodiment, the auxiliary electrode 160 is linearly moved after a predetermined number of strands of the nanofibers 150 are aligned in the alignment direction A by rotating the drum collector 120 For example, the auxiliary electrode 160 may be linearly moved while the drum collector 120 is rotated.

As described above, when the nanofibers 150 are formed in a plurality of rows, the alignment direction of the nanofibers 150 can be changed to form a desired pattern such as a grid structure. The formation of the nanofibers 150 in the pattern of the grid structure is the same as that of the above embodiment, and a description thereof will be omitted.

Thereafter, the polymer material layer may be removed from the nanofibers 150 to form a transparent electrode composed of the nanomaterial layer. In addition, the transparent electrode may further include a transparent conductive layer (not shown) formed on the nanomaterial layer.

As described above, by providing the auxiliary electrode inside the drum collector 120, the jet emitted from the spinneret 110 can be more concentrated, and the degree of alignment of the nanofibers can be further improved.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10, 110: Spinning nozzle 20, 120: Drum collector
22, 122: rotary shaft 30, 130: motor
50, 150: nanofiber 51: nanomaterial layer
52: Polymer material layer

Claims (16)

An inner nozzle for applying a voltage and emitting at least one of a nano material and a polymer material; and an outer nozzle formed to surround the inner nozzle and radiating the other of the nano material and the polymer material, And a polymer material layer formed of the polymer material is a coaxial double-layered nanofiber;
A drum collector on which the nanofibers are collected from the spinning nozzle;
And a rotating mechanism for rotating the drum collector to align the nanofibers emitted from the spinning nozzle in a predetermined alignment direction in the drum collector. The method according to claim 1,
Further comprising a moving mechanism for linearly moving one of the spinning nozzle and the drum collector in the direction of the rotation axis of the drum collector. The method according to claim 1,
And an auxiliary electrode provided inside the drum collector and grounded or having a voltage opposite to that of the spinneret. The method of claim 3,
Further comprising a moving mechanism for linearly moving the auxiliary electrode in the direction of the rotation axis of the drum collector. The method according to claim 2 or 4,
The pitch of the nanofibers arranged in the direction of the axis of rotation of the drum collector,
And the drum collector is set based on a radiation angle of the spinning nozzle, and a linear movement speed of the spinneret or the drum collector. The method according to claim 2 or 4,
The alignment direction may be,
And the drum collector is set based on a radiation angle of the spinning nozzle, and a linear movement speed of the spinneret or the drum collector. Applying a voltage to the spinneret to spin the nanofiber layer formed of the nanoparticulate material and the polymeric material layer formed of the polymeric material into nanofibers composed of a coaxial bilayer;
Grounding the drum collector disposed opposite the spinneret or applying a voltage opposite to the spinneret;
Rotating the drum collector at a predetermined set rotational speed so that nanofibers emitted from the spinneret are aligned in a predetermined alignment direction;
And removing the polymer material from the nanofibers to form a transparent electrode composed of the nanomaterial. The method of manufacturing a transparent electrode using an electrospinning device according to claim 1, The method of claim 7,
Wherein the nanofibers are aligned and formed,
And moving one of the spinning nozzle and the drum collector at a predetermined linear moving speed. The method of manufacturing a transparent electrode using an electrospinning device according to claim 1, Applying a voltage to the spinneret to spin the nanofiber layer formed of the nanoparticulate material and the polymeric material layer formed of the polymeric material into nanofibers composed of a coaxial bilayer;
Providing an auxiliary electrode inside the drum collector arranged to face the spinning nozzle and grounding the auxiliary electrode or applying a voltage opposite to the spinning nozzle to the auxiliary electrode;
Rotating the drum collector at a predetermined set rotational speed so that nanofibers emitted from the spinneret are aligned in a predetermined alignment direction;
And removing the polymer material from the nanofibers to form a transparent electrode composed of the nanomaterial. The method for manufacturing a transparent electrode using an electrospinning device using a drum collector The method of claim 9,
Wherein the nanofibers are aligned and formed,
And a step of moving the auxiliary electrode at a predetermined linear movement speed. The method for manufacturing a transparent electrode using an electrospinning device using a drum collector The method according to claim 7 or 9,
Before forming the transparent electrode,
Removing the first nanofiber layer from the drum collector when the nanofibers are aligned in the alignment direction to form a first nanofiber layer;
Rotating the first nanofiber layer at a predetermined crossing angle in the alignment direction and attaching the first nanofiber layer to the drum collector;
Wherein the spinneret sprays the nanofiber layer and the polymeric material layer on the first nanofiber layer attached to the drum collector, the nanofiber layer comprising a coaxial double layer;
And rotating the drum collector to align the nanofibers emitted from the spinning nozzle on the first nanofiber layer in the aligning direction to form a second nanofiber layer crossing the first nanofiber layer at the crossing angle A method for manufacturing a transparent electrode using an electrospinning device using a drum collector further comprising The method according to claim 7 or 9,
Before forming the transparent electrode,
And separating the nanofibers from the integrated substrate attached to the drum collector and transferring the nanofibers to a separate substrate. The manufacturing method of the transparent electrode using the electrospinning device using the drum collector The method of claim 12,
The integrated substrate is manufactured by a method of manufacturing a transparent electrode using an electrospinning device using a drum collector which is a free standing substrate The method according to claim 7 or 9,
A method of manufacturing a transparent electrode using an electrospinning device using a drum collector using an organic solvent or reactive ion etching for removing the polymeric material The method according to claim 7 or 9,
The forming of the transparent electrode may include:
And forming a transparent conductive layer on the nanomaterial. The method for manufacturing a transparent electrode using an electrospinning device using a drum collector 16. The method of claim 15,
The transparent conductive layer is formed by a method of manufacturing a transparent electrode using an electrospinning device using a drum collector including graphene, graphite, and carbon nanotubes
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