KR101701601B1 - Electro-spinning apparatus using magnetic field and method of manufacturing a transparent electrode using the same - Google Patents

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

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Publication number
KR101701601B1
KR101701601B1 KR1020150050244A KR20150050244A KR101701601B1 KR 101701601 B1 KR101701601 B1 KR 101701601B1 KR 1020150050244 A KR1020150050244 A KR 1020150050244A KR 20150050244 A KR20150050244 A KR 20150050244A KR 101701601 B1 KR101701601 B1 KR 101701601B1
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South Korea
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magnetic field
nanofibers
nanomaterial
integrated substrate
polymer material
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KR1020150050244A
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Korean (ko)
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KR20160121653A (en
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박장웅
현병관
지상윤
안병완
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희성전자 주식회사
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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
    • 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

Abstract

Since the electrospinning device according to the present invention can arrange the nanofibers in a certain direction by using the magnetic field formed by the magnet by disposing the magnets around the integrated substrate, it is possible to manufacture a transparent electrode made of nanofibers having directionality . 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.

Description

TECHNICAL FIELD The present invention relates to an electrospinning device using a magnetic field and a method of manufacturing a transparent electrode using the electrospinning device.

The present invention relates to an electrospinning device using a magnetic field and a method of manufacturing a transparent electrode using the electrospinning device. More particularly, the present invention relates to an electrospinning device using a magnetic field for producing conductive nanofibers To a method of manufacturing a transparent electrode.

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 low in flexibility and stretchability, and thus is hardly applicable to a flexible display device.

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 device using a magnetic field capable of producing a transparent electrode having flexibility and stretchability in a simple and economical process and a method of manufacturing a transparent electrode using the electrospinning device.

An electrospinning device using a magnetic field according to the present invention includes a spinning nozzle to which a voltage is applied and which radiates a nanomaterial and a polymer material together with nanomaterials that are emitted from the spinning nozzle and nanofibers And a magnetic field generating module installed in the periphery of the integrated substrate and generating a magnetic field on the integrated substrate to align the nanofibers emitted from the spinning nozzle in a predetermined alignment direction.

According to another aspect of the present invention, there is provided an electrospinning device using a magnetic field, the electrospinning device including: an internal nozzle to which a voltage is applied and radiates at least one of a nanomaterial and a polymer material; A spinneret for spinning nanofibers composed of the nanomaterial layer formed of the nanomaterial and the polymer material layer formed of the polymer material, the nanofibers being formed of a coaxial double layer; A method for fabricating a nanostructure, comprising: an integrated substrate on which a nanomaterial and nanofibers including the polymer are integrated; a magnetic field generator installed on the periphery of the integrated substrate to generate a magnetic field on the integrated substrate, As shown in FIG.

A method of manufacturing a transparent electrode using an electrospinning device using a magnetic field according to the present invention includes the steps of disposing a magnetic field generating module to form a magnetic field around an integrated substrate, applying voltage to the spinning nozzle, The method comprising the steps of: spinning a nanomaterial and a polymeric material on a substrate; forming nanofibers and the nanofibers emitted from the spinning nozzle, the nanofibers being aligned in a predetermined alignment direction by the magnetic field; And removing the polymer material from the nanofibers to form a transparent electrode composed of the nanomaterial.

A method of manufacturing a transparent electrode using an electrospinning device using a magnetic field according to another aspect of the present invention includes the steps of disposing a magnetic field generating module to form a magnetic field around an integrated substrate, Comprising the steps of: spinning nanofibers composed of a nanomaterial layer formed of a nanomaterial and a polymeric material layer formed of a polymer material into a coaxial bilayer from the spinning nozzle on the spinning nozzle; Wherein the nanofibers are aligned in a predetermined alignment direction by the magnetic field, and removing the polymer material from the nanofibers to form a transparent electrode composed of the nanomaterial.

Since the electrospinning device according to the present invention can arrange the nanofibers in a certain direction by using the magnetic field formed by the magnet by disposing the magnets around the integrated substrate, it is possible to manufacture a transparent electrode made of nanofibers having directionality .

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 a first embodiment of the present invention.
FIG. 2 is a view showing magnetic force lines by the magnet shown in FIG. 1. FIG.
3 is an enlarged cross-sectional view of the spinneret shown in Fig.
4 is a perspective view showing nanofibers made of a coaxial double layer by the electrospinning apparatus shown in FIG.
5 is a flowchart showing a method of manufacturing a transparent electrode using the electrospinning device according to the first embodiment of the present invention.
Figure 6 is a schematic diagram illustrating the nanofiber crossing method shown in Figure 5;
7 is a photograph showing a nanofiber grid fabricated by the method shown in FIG.
8 is a view showing another example of the substrate in the electrospinning apparatus shown in Fig.
9 is a view showing an electrospinning apparatus according to a second embodiment of the present invention.
10 is a view showing magnetic force lines by the magnet shown in Fig.

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 a first embodiment of the present invention. FIG. 2 is a view showing magnetic force lines by the magnet shown in FIG. 1. FIG. 3 is an enlarged cross-sectional view of the spinneret shown in Fig. 4 is a perspective view showing nanofibers made of a coaxial double layer by the electrospinning apparatus shown in FIG.

1, the electrospinning device 1 according to the first embodiment of the present invention includes a spinning nozzle 10, an integrated substrate 20, a magnetic field generating module, and a power supply unit 46. [

Referring to FIGS. 1 and 3, a spinning solution tank 40 and a syringe pump 44 are connected to the spinning nozzle 10.

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.

The spinning nozzle 10 receives the nanomaterial and the polymer material from the spinning solution tank 10 and radiates through a tip of the spinneret 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.

The syringe pump 44 is a pump for pressurizing 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 44 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 integrated substrate 20 is a substrate on which the nano material layer 51 and the polymer material layer 52 radiated from the spinning nozzle 10 are integrated with the nanofibers 50 having a coaxial double layer structure. The integrated substrate 20 has a flat plate shape, but the present invention is not limited thereto. For example, the integrated substrate 20 may have a plate shape, a drum shape, a parallel rod shape, an intersecting rod shape, or a grid shape. The integrated substrate 20 is positioned below the spinning nozzle 10.

An electrode is provided under the integrated substrate 20, and the electrode has a ground voltage, for example, a voltage of 0V. However, the present invention is not limited thereto, and the integrated substrate 20 may be grounded or the integrated substrate 20 may have a voltage opposite to the spinning nozzle 10.

The magnetic field generating module is a magnet 30 installed around the integrated substrate 20, for example. The magnet (30) is arranged to form a magnetic field around the integrated substrate (20). In the present embodiment, the magnet 30 includes two first and second magnets 31 and 32, for example. The first magnet 31 and the second magnet 32 may be disposed above the integrated substrate 20 or horizontally with respect to the integrated substrate 20. Also, the integrated substrate 20 is disposed between the first magnet 31 and the second magnet 32. Further, the N pole of the first magnet 31 and the S pole of the second magnet 32 are arranged to face each other. A magnetic field line 30a indicating the direction of the magnetic field is formed in a region between the N pole of the first magnet 31 and the S pole of the second magnet 32 and the magnetic field line 30a is substantially straight The first magnet 31 and the second magnet 32 are disposed such that the integrated substrate 20 is positioned in a region close to the first magnet 31 and the second magnet 32. The nanofiber electrospun in the spinning nozzle 10 is attracted to the first magnet 31 and the second magnet 32 because the object is accelerated by the force received by the magnetic field Lt; / RTI > That is, when the N pole of the first magnet 31 and the S pole of the second magnet 32 are radiated, the N pole of the first magnet 31 and the S pole of the second magnet 32 The nanofibers 50 can be aligned in a direction perpendicular to the direction X of the magnetic line of force 30a formed between the nanofibers. When the thumb, the index finger and the stop finger of the left hand are opened vertically, the stop is the direction of the current (-Z), the index is the direction of the magnetic field (X ), The thumb is the direction of the force (Y) the current receives in the magnetic field, which is also called the left hand rule of Fleming. Therefore, the nanofibers electrospun in the spinning nozzle 10 are aligned in the direction of the force Y by the force of Lorentz received from the magnetic field formed between the first magnet 31 and the second magnet 32 Direction (Y).

The intensity of the magnetic field may be varied according to the intensity of the magnet 30, and the intensity of the magnet 30 may be adjusted according to the size of the integrated substrate 20. That is, when the size of the integrated substrate 20 is large, as the distance between the first magnet 31 and the second magnet 32 increases, the distance between the first magnet 31 and the second magnet 32 increases, The first magnet 31 and the second magnet 32 may be made of a material having a greater magnetic intensity so that the magnitude of the magnetic field formed between the first magnet 31 and the second magnet 32 is sufficient.

Reference numeral 46 denotes an external power source for applying a voltage to the spinning nozzle 10. A voltage is applied to the spinning nozzle 10 by the external power source 46, and the electrode is grounded to generate a voltage difference with the spinning nozzle 10. In the present embodiment, the voltage is DC (DC), but it is of course possible to use alternating current (AC). When the alternating current is used, the spinning nozzle 10 and the electrode are controlled to have voltages opposite to each other.

The electrospinning device 1 further includes a moving mechanism (not shown) for moving at least one of the spinning nozzle 10 and the integrated substrate 20 in a direction X perpendicular to the alignment direction Y . In this embodiment, the moving mechanism (not shown) moves the integrated substrate 20 by way of example. When the integrated substrate 20 is moved by the moving mechanism (not shown), a plurality of nanofibers 50 are aligned in the alignment direction Y, and a direction X ) May be formed as a plurality of rows spaced apart from each other by a predetermined distance. The moving speed and the moving time of the moving mechanism (not shown) may be set in advance according to the intervals of the rows of the nanofibers 50 and the like.

The electrospinning device 1 further includes a rotation mechanism (not shown) for rotating the integrated substrate 20. The rotating mechanism (not shown) may be any mechanism that can rotate the integrated substrate 20 in a horizontal direction by a preset angle. The rotation mechanism (not shown) rotates the integrated substrate 20 in the horizontal direction by 90 degrees. However, the present invention is not limited to this, and it is of course possible for the user to directly rotate the integrated substrate 20.

5 is a flowchart showing a method of manufacturing a transparent electrode using the electrospinning device according to the first embodiment of the present invention. Figure 6 is a schematic diagram illustrating the nanofiber crossing method shown in Figure 5;

A method of manufacturing a transparent electrode using the electrospinning device according to the first embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG.

First, the magnets 30 are disposed to form a magnetic field around the integrated substrate 20. (S11) Referring to FIG. 1, the magnets 30 are disposed on the upper side of the integrated substrate 20, The first magnet 31 and the second magnet 32 are disposed. The first magnet 31 and the second magnet 32 may be disposed above the integrated substrate 20 or horizontally with respect to the integrated substrate 20. The first magnet 31 and the second magnet 32 are spaced apart from each other by a predetermined distance and the integrated substrate 20 is disposed between the first magnet 31 and the second magnet 32, . The gap between the first magnet 31 and the second magnet 32 is equal to or longer than the size of the integrated substrate 20. At this time, the first magnet 31 and the second magnet 32 are arranged with mutually opposite poles. That is, the N pole of the first magnet 31 and the S pole of the second magnet 32 are arranged to face each other. A magnetic field formed between the first magnet 31 and the second magnet 32 is emitted from the N pole of the first magnet 31 and is directed to the S pole of the second magnet 32. [ A magnetic field line 30a indicating a direction X of the magnetic field is formed between the N pole of the first magnet 31 and the S pole of the second magnet 32 so as to be almost linear.

When a voltage is applied to the spinning nozzle 10, the nanomaterial and the polymer material are emitted together from 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. 4, the nanofibers 50 irradiated 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. Also, the viscosity of the polymer material should be equal to or greater than the viscosity of the nanomaterial. (S12)

The nanofibers radiated from the spinning nozzle 10 receive a force generated by a magnetic field formed between the first magnet 31 and the second magnet 32 and are perpendicular to the direction X of the magnetic force line 30a The nanofibers 50 may be aligned in the alignment direction Y. Since the nanofibers 50 are continuously irradiated from the spinning nozzle 10, the nanofibers 50 aligned in the alignment direction Y It can consist of one strand or several strands. When the thumb, the index finger and the stop finger of the left hand are opened vertically, the stop is the direction of the current (-Z), the index is the direction of the magnetic field (X ), The thumb is the direction of the force (Y) the current receives in the magnetic field, which is also called the left hand rule of Fleming. Therefore, the nanofibers electrospun in the spinning nozzle 10 are aligned in the direction of the force Y by the force of Lorentz received from the magnetic field formed between the first magnet 31 and the second magnet 32 Direction (Y).

At this time, when the certain strands of the nanofibers 50 are aligned, it is also possible to linearly move the integrated substrate 20 by a predetermined distance in a direction (X) perpendicular to the alignment direction (Y). When the integrated substrate 20 is moved, nanofibers that are continuously radiated at positions spaced apart from each other by the already aligned nanofibers can be aligned. In this way, the plurality of nanofibers 50 are aligned in the alignment direction Y and are spaced apart or overlapped with each other in the direction X perpendicular to the alignment direction Y to be arranged in a plurality of rows .

Referring to FIG. 6, the nanofibers 50 may change the alignment direction to form a desired pattern such as a grid structure. In the present embodiment, a grid structure is formed by crossing a plurality of nanofibers, for example. 6A, when the first nanofiber layer 61 is formed by aligning the plurality of nanofibers 50 in the alignment direction Y, the integrated substrate 20 is rotated 90 degrees as shown in FIG. 6B, Rotate at an angle. The nanofibers of the first nanofiber layer 61 are arranged in a direction X perpendicular to the alignment direction Y when the integrated substrate 20 is rotated by 90 degrees. 6C, when the nanofibers 50 are irradiated from the spinning nozzle 10 onto the first nanofiber layer 61, the nanofibers are aligned in the alignment direction Y by the magnetic field . 6D, 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. Accordingly, a nanofiber layer 60 having a grid structure is formed (S14)

When the nanofiber layer 60 having the grid structure is formed on the integrated substrate 20, 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 20 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) The polymer material layer 52 can be removed using an organic solvent . Referring to FIG. 7, it can be confirmed by comparing before and after the removal of the polymer material layer.

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. 4A, the nanofibers 50 surround the polymeric material layer 52. Referring to FIG. 4B, when the polymer material layer 52 is removed, only the nanomaterial layer 51 is left, and the transparent electrode is composed 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.

Fig. 8 is a view showing another example of the integrated substrate in the electrospinning apparatus shown in Fig. 1. Fig.

Referring to FIG. 8, the integrated substrate 120 may be a free standing substrate that does not support the lower side of the object to be integrated. The integrated substrate 120 may have a ring shape with a central portion penetrating therethrough. For example, the integrated substrate 120 may have a horeshoe shape in which a central portion is opened and an outer edge is not connected. It may also have a polygonal shape with a central portion open and an outer rim connected, or a polygonal shape with a central portion open and an outer rim connected.

When the integrated substrate 120 is used as the free standing substrate in manufacturing the transparent electrode, the aligned nanofibers irradiated to the integrated substrate 120 are separated from the integrated substrate 120, ).

The method of aligning the nanofibers to the integrated substrate 120 by aligning the nanofibers is the same as that of the above embodiment, and thus a detailed description thereof will be omitted.

9 is a view showing an electrospinning apparatus according to a second embodiment of the present invention. 10 is a view showing magnetic force lines by the magnet shown in Fig.

9 and 10, an electrospinning device 100 according to a second embodiment of the present invention includes a spinning nozzle 10, an integrated substrate 20, and a magnetic field generating module, Since the magnet 130 is disposed on one side of the integrated substrate 20 in such a manner that the N poles are positioned on the same side as the first embodiment, the other structures and operations are similar to each other, A detailed description of the configuration is omitted.

The magnets 130 are arranged to form a magnetic field at one side of the integrated substrate 20. Since the magnetic field is formed in the direction X from the N pole of the magnet 130, the magnetic force line 130a indicating the direction X of the magnetic field is formed in the vicinity of the N pole of the magnet 130, . Therefore, the nanofibers 151 radiated from the spinning nozzle 10 can be aligned in the alignment direction Y by receiving a magnetic field force formed around the N pole of the magnet 130. The force that the charged particle receives by the electric field or the magnetic field is called the Lorentz force. When the finger of Fleming's left hand grasps the thumb, the index finger and the stop finger of the left hand perpendicularly, (X) of the magnetic field, and the thumb is the direction (Y) of the force applied by the magnetic field. Therefore, the nanofibers electrospun in the spinning nozzle 10 can be aligned in the alignment direction Y, which is the direction Y of the force, by a magnetic field formed in a direction emerging from the N pole of the magnet 130.

A ground electrode is provided under the integrated substrate 20, and the ground electrode has a ground voltage, for example, a voltage of 0V. However, the present invention is not limited thereto, and the integrated substrate 20 may be grounded or the integrated substrate 20 may have a voltage opposite to the spinning nozzle 10.

Meanwhile, the paramagnetic material may be mixed with paramagnetic nanoparticles to improve the degree of magnetization of the nanofibers 151 ejected from the spinning nozzle 10. When the degree of magnetization of the nanofibers 151 is improved, the alignment of the nanofibers 151 can be more easily performed. When the paramagnetic nanoparticles are mixed at about 10 wt%, the degree of alignment of the nanofibers 151 is the highest.

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: Spinning nozzle 20: Integrated substrate
30,130: Magnet 50,151: Nanofiber
51: Nanomaterial layer 52: Polymer material layer

Claims (15)

delete An internal nozzle to which a nanomaterial solution mixed with a nanomaterial selected from the group consisting of gold, silver, copper, copper oxide and cobalt is mixed with a solvent to which a voltage is applied, A spinneret for spinning a nanofiber formed of the nanomaterial and a polymeric material layer formed of the polymer material, the nanofiber comprising a coaxial double layer;
An integrated substrate on which the nanofibers are integrated;
And a magnetic field generating module provided around the integrated substrate and generating a magnetic field on the upper side of the integrated substrate to align the nanofibers emitted from the spinning nozzle in a preset alignment direction,
The spinning speed of the polymer material is larger than the spinning speed of the nanomaterial,
And a magnetic field for removing the polymer material layer from the aligned nanofibers. The method of claim 2,
Wherein the magnetic field generation module includes first and second magnets provided on both sides of the integrated substrate so as to sandwich the integrated substrate,
Wherein the N poles of the first magnet and the S poles of the second magnet are opposed to each other so that the nanofibers are aligned in the aligning direction by a magnetic field connected from the N pole to the S pole, Device. The method of claim 2,
Wherein the magnetic field generation module is disposed such that an N pole is positioned on one side of the integrated substrate,
And the nanofibers are aligned in the alignment direction by a magnetic field generated from the N pole. The method of claim 2,
Further comprising a moving mechanism for moving at least one of the spinning nozzle and the integrated substrate in a direction perpendicular to the aligning direction. The method of claim 2,
And a rotating mechanism for rotating the integrated substrate at a predetermined angle. delete Disposing a magnetic field generating module to form a magnetic field around the integrated substrate;
A voltage is applied to the spinning nozzle to form a nanomaterial mixed with a nanomaterial and a solvent selected from the group consisting of gold, silver, copper, copper oxide and cobalt from the inner nozzle of the spinning nozzle on the integrated substrate A polymer solution containing a polymer material is radiated from an outer nozzle of the spinning nozzle to spin a nanomaterial layer formed of the nanomaterial and a polymer material layer formed of the polymer material to emit nanofibers composed of a coaxial double layer ;
Wherein the nanofibers emitted from the spinning nozzle are aligned in a predetermined alignment direction by the magnetic field;
And removing the polymer material from the nanofibers to form an electrode composed of the nanomaterial,
Wherein the spinning speed of the polymer material is set to be larger than the spinning speed of the nanomaterial. The method of claim 8,
Rotating the integrated substrate at a predetermined angle when the nanofibers are aligned in the alignment direction to form a first nanofiber layer;
The nanofibers including the nanomaterial and the polymer material are radiated from the spinning nozzle onto the first nanofiber layer, and the nanofibers radiated from the spinning nozzle are aligned in the alignment direction by the magnetic field, And forming a second nanofiber layer crossing the nano fiber layer at a predetermined angle. The method of claim 8,
The method of manufacturing a transparent electrode using an electrospinning device according to claim 1, further comprising the step of separating the nanofibers from the integrated substrate and transferring the nanofibers to a separate substrate. The method of claim 10,
Wherein the integrated substrate is an electrospinning device using a magnetic field which is a free standing substrate. The method of claim 8,
Wherein forming the electrode comprises:
A method of manufacturing a transparent electrode using an electrospinning device using a magnetic field using an organic solvent or reactive ion etching to remove the polymeric material. The method of claim 8,
Wherein forming the electrode comprises:
And forming a transparent conductive layer on the nanomaterial. The method of manufacturing a transparent electrode according to claim 1, 14. The method of claim 13,
Wherein the transparent conductive layer is an electrospinning device using a magnetic field including graphene, graphite, and carbon nanotubes. delete
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