KR20160059215A - Preparing method of transparent electrode - Google Patents

Preparing method of transparent electrode Download PDF

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KR20160059215A
KR20160059215A KR1020140160807A KR20140160807A KR20160059215A KR 20160059215 A KR20160059215 A KR 20160059215A KR 1020140160807 A KR1020140160807 A KR 1020140160807A KR 20140160807 A KR20140160807 A KR 20140160807A KR 20160059215 A KR20160059215 A KR 20160059215A
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South Korea
Prior art keywords
transparent electrode
printing
silver
conductive
conductive ink
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KR1020140160807A
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Korean (ko)
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김혜경
이소희
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영남대학교 산학협력단
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Priority to KR1020140160807A priority Critical patent/KR20160059215A/en
Publication of KR20160059215A publication Critical patent/KR20160059215A/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/52—Electrically conductive inks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0033—Apparatus or processes specially adapted for manufacturing conductors or cables by electrostatic coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0009—Details relating to the conductive cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0009—Details relating to the conductive cores
    • H01B7/0027—Liquid conductors

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The present invention provides a method of manufacturing a conductive ink, comprising the steps of: (1) preparing a first conductive ink in which silver nano wires are dispersed; (Step 2) of producing a second conductive ink in which silver nanowires and silver nanoparticles are dispersed; Printing the first conductive ink on the substrate to produce a transparent electrode portion (third step); And a step of manufacturing the conductive electrode portion by printing the second conductive ink on at least one side of the substrate on which the transparent electrode portion is printed in succession to the manufacturing step of the transparent electrode portion (the third step) A method for manufacturing a transparent electrode is provided.
Accordingly, a transparent electrode is formed and a conductive electrode having a continuous pattern is formed, so that the transparent electrode can be manufactured in a single process. The additional sintering process for contacting the particles of the conductive electrode including the circular silver nanoparticles is not needed and the efficiency of the process is increased and the conductive electrode made of the silver nanowire and the silver nanoparticle can be printed and formed into a pattern, It can be applied to parts. In addition, silver nanoparticles are added to silver nano wires to form contact points to form an electric conduction path, thereby reducing the amount of silver used.

Description

[0002] Preparing method of transparent electrode [

The present invention relates to a method of manufacturing a transparent electrode, and more particularly, to a method of manufacturing a transparent electrode including a conductive electrode on a substrate.

In general, electrodes are widely used in various fields. The role of the electrode is to transfer electric charge to each electric element, thereby performing energy transfer for driving each electric element. Therefore, it is essential to have a resistivity and stability as low as possible. Generally, metals such as silver and copper are the main materials for the electrodes, and transparent electrodes (ITO, etc.) are used particularly in the display field.

The transparent electrode is an electronic component having a transparency of not less than 80% and a sheet resistance of 500 Ω / sqm or less, and is widely used in electronic fields such as LCD front electrodes, OLED electrodes, displays, touch screens, solar cells, and optoelectronic devices. In particular, transparent conductive electrodes (TCE) are widely used in organic light emitting diodes (OLED), liquid crystal displays (LCD), organic solar cells and the like. In these devices, indium tin oxide (ITO) is commonly used as a transparent electrode. ITO electrodes have many advantages such as optical transparency, electrical conductivity, and environmental stability. With the rapid growth of the display industry, there is a growing demand for transparent electrodes. As a result, the problem of indium depletion has become an important issue in the world, and this increase in industrial demand is causing the problem of distribution of rare-earth metal resources. Therefore, for transparent electrodes that replace ITO, transparent metal oxide, carbon nanotube Carbon Nano Tube; (Hereinafter " CNT "), conductive polymer, and graphene. The transparent electrode technology market, led by ITO and CNT, has realized many functions by making transparent electrode conductors rather than opaque conductors such as copper in transparent films. Since the ITO electrode material applied to the existing touch screen panel (TSP) is difficult to use for flexible displays that are not flexible or curved, it is a next-generation new material to replace the ITO film. Graphene, CNT, (Ag nanowires) have attracted attention.

Silver nano wires have high conductivity and are used as materials for electrodes that have electrical conductivity. The silver nanowire has a three-dimensional network structure and has a high transmittance and conductivity even when it is made of a transparent electrode. However, in the case of the conductive electrode extending from the transparent electrode, the nanowire includes circular nanoparticles centered on the silver nanoparticle .

1 is a schematic view showing a manufacturing process of a conductive electrode in a conventional method of manufacturing a transparent electrode.

Referring to the drawing, it can be seen that the circular nanoparticles of the conductive electrode have conductivity when the particles are brought into contact with each other through the high-temperature sintering process. Therefore, when conducting electrodes are manufactured using metal particles, there is a problem in that the efficiency of the process is reduced because an additional sintering process is required.

On the other hand, Korean Patent Laid-Open Publication No. 2010-0112098 discloses a composition for a printing paste in which the swelling property is optimally adjusted so as to obtain a printing pattern having excellent printing properties and an electrode formed therefrom. Thus, although the straightness and clarity of the print pattern can be obtained, no method has been disclosed for manufacturing a conductive electrode having a pattern formed on the transparent electrode by printing in a single process.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method of manufacturing a conductive ink, (Step 2) of producing a second conductive ink in which silver nanowires and silver nanoparticles are dispersed; Printing the first conductive ink on the substrate to produce a transparent electrode portion (third step); And a step of manufacturing the conductive electrode portion by printing the second conductive ink on at least one side of the substrate on which the transparent electrode portion is printed in succession to the manufacturing step of the transparent electrode portion (the third step) A method for manufacturing a transparent electrode is provided.

The second conductive ink may be prepared by adding 0.005 to 1 part by weight of silver nanowires and 1 to 20 parts by weight of silver nanoparticles to 100 parts by weight of the solvent.

In addition, the method of printing the transparent electrode part in the third step may be performed by any one method selected from the group consisting of an ink jet method, a bar coating method and a spray method.

Also, the method of printing the conductive electrode portion in the third step can be performed by any one method selected from the group consisting of screen printing, offset printing, roll to roll printing, spray printing, roll to sheet printing, gravure printing and slot die printing have.

The conductive electrode unit may include 5 to 60 wt% of silver nanowires.

SUMMARY OF THE INVENTION In order to accomplish the above object, the present invention provides a method of manufacturing an image-forming transparent electrode including a conductive electrode patterned using a conductive ink containing silver nanowires and silver nanoparticles without an additional sintering process.

According to the method for manufacturing a transparent electrode including a silver wire according to the present invention, a transparent electrode is formed and a conductive electrode having a continuous pattern is formed, so that the transparent electrode can be manufactured in a single process. The additional sintering process for contacting the particles of the conductive electrode including the circular silver nanoparticles is not needed and the efficiency of the process is increased and the conductive electrode made of the silver nanowire and the silver nanoparticle can be printed and formed into a pattern, It can be applied to parts. In addition, silver nanoparticles are added to silver nano wires to form contact points to form an electric conduction path, thereby reducing the amount of silver used.

1 is a schematic view showing a manufacturing process of a conductive electrode in a conventional method of manufacturing a transparent electrode.
2 is a flow chart of a process of a method of manufacturing a transparent electrode according to an embodiment of the present invention.
3 is a plan view of a transparent electrode according to an embodiment of the present invention.
4 is a side cross-sectional view of a deformed transparent electrode according to an embodiment of the present invention.
FIG. 5 is a photograph of a transparent electrode according to an embodiment of the present invention. Referring to FIG.
FIG. 6 is a graph showing sheet resistance according to a process temperature of a conductive electrode part of a two-dimensional transparent electrode manufactured by the method of manufacturing a transparent electrode according to an embodiment of the present invention.

The inventor of the present invention has proposed a method of manufacturing a conductive ink including silver nano wire by printing silver electrode and printing conductive electrode part continuously by using silver nano particles when forming conductive electrode on transparent electrode A method of manufacturing a transparent electrode including a conductive electrode by a single process has been completed.

Hereinafter, the present invention will be described in more detail.

The present invention provides a method of manufacturing a conductive ink, comprising the steps of: (1) preparing a first conductive ink in which silver nano wires are dispersed; (Step 2) of producing a second conductive ink in which silver nanowires and silver nanoparticles are dispersed; Printing the first conductive ink on the substrate to produce a transparent electrode portion (third step); And a step of manufacturing the conductive electrode portion by printing the second conductive ink on at least one side of the substrate on which the transparent electrode portion is printed in succession to the manufacturing step of the transparent electrode portion (the third step) A method for manufacturing a transparent electrode is provided.

2 is a flow chart of a process of a method of manufacturing a transparent electrode according to an embodiment of the present invention.

Referring to the drawing, a first conductive ink for printing the transparent electrode unit 200 is prepared, and a second conductive ink for printing the conductive electrode unit 300 is prepared. Thereafter, 200 and the conductive electrode unit 300 may be successively printed to produce a transparent electrode having a conductive electrode unit 300.

The silver nano wire 400 may have a length of 10 to 50 mu m and a diameter of 20 to 60 nm, but is not limited thereto.

The silver nanoparticles 500 may be particles having a diameter of 50 to 100 nm, but are not limited thereto.

The first conductive ink may be prepared by dispersing the silver nano wire 400 in a solvent such as ethanol or methanol. If the first conductive ink does not interfere with the printing of the first conductive ink, a silver nano wire stabilizer such as potassium bromide (KBr) Can be added.

The first conductive ink may include 0.1 to 60 wt% of silver nano wire 400.

In the second step, the silver nano wire 400 and the silver nanoparticles 500 may be dispersed to produce the second conductive ink.

The second conductive ink may include 0.005 to 1 part by weight of the silver nanowire 400 and 1 to 20 parts by weight of the silver nanoparticle 500 with respect to 100 parts by weight of the solvent.

The solvent may be ethanol or methanol, and it is preferable to select one that is not reactive with the substrate.

The third step is to print the first conductive ink on the substrate to produce the transparent electrode part 200 and successively to form the second conductive ink 200 on at least one side of the substrate 100 on which the transparent electrode part 200 is printed. The conductive electrode unit 300 can be manufactured.

Since the conductive electrode unit 300 can be continuously printed after the transparent electrode unit 200 is manufactured, there is an effect that an additional process of manufacturing the conductive electrode and joining it to the transparent electrode is not necessary.

The substrate 100 may be made of glass or polyethylene terephthalate (PET), but it is not limited thereto. The substrate 100 may serve as a support for supporting the coated silver nano wire 400, It is possible to use a material composed of a polymer which does not react with the solvent included in the first conductive ink and the second conductive ink.

On the other hand, it is possible to add a step of preheating the substrate to a predetermined temperature before printing on the substrate, thereby reducing the drying time after the first conductive ink and the second conductive ink are printed.

The method of printing the transparent electrode unit 200 can be performed by any one method selected from the group consisting of an ink jet method, a bar coating method, and a spray method.

The method of printing the conductive electrode unit 300 can be performed by any one method selected from the group consisting of screen printing, offset printing, roll-to-roll printing, spray printing, roll-to-sheet printing, gravure printing, have.

During the printing of the conductive electrode unit 300, the process temperature can be maintained at 60 to 100 캜.

In the third step, when the conductive electrode unit 300 is printed with the second conductive ink, the conductive electrode unit 300 may include 0.1 to 60 wt% of the silver nano wire 400.

3 is a plan view of a transparent electrode according to an embodiment of the present invention.

Referring to FIG. 3, the differential transparent electrode includes a substrate 100, a transparent electrode unit 200, and a conductive electrode unit 300.

4 is a side cross-sectional view of a deformed transparent electrode according to an embodiment of the present invention.

Referring to the drawing, when a silver nano wire 400 is printed and uniformly coated on a substrate 100, contacts are formed between the silver nano wires 400 to form a network structure, and a transparent electrode unit 200 having conductivity is formed do.

The second conductive ink having the silver nano wire 400 and the silver nanoparticles 500 dispersed therein is continuously printed on at least one side of the transparent electrode unit 200 so that the conductive electrode unit 300 extending from the transparent electrode unit 200 The silver nano wire 400 inside the conductive electrode unit 300 forms a contact with the silver nano wire 400 coated with the transparent electrode unit 200 and becomes conductive.

On the other hand, silver nano particles 500 are added to the conductive electrode unit 300 to increase the contact points between the silver nano wires 400 to exhibit conductivity. Accordingly, while the conventional conductive electrode includes only silver nanoparticles and passes through the sintering process to exhibit conductivity, the conductive electrode unit 300 of the present invention is formed by adding the silver nanoparticles 500 between the silver nanowires 400, An additional sintering process is not necessary since the conductivity can be improved by increasing the contact point.

Also, since the conductivity of the conductive electrode can be increased by using a small amount of the silver nano wire 400, the amount of expensive silver can be reduced.

FIG. 5 is a photograph of a transparent electrode according to an embodiment of the present invention. Referring to FIG.

Referring to the drawing, it can be seen that the transparent electrode unit 200 has a high transmittance while the conductive electrode unit 300 formed on one side of the transparent electrode unit 200 has a low transmittance.

FIG. 6 is a graph showing sheet resistance according to a process temperature of a conductive electrode part of a two-dimensional transparent electrode manufactured by the method of manufacturing a transparent electrode according to an embodiment of the present invention.

Referring to FIG. 3, when the process temperature is maintained at 60 ° C or higher during the printing of the conductive electrode unit 300 in the third step, the sheet resistance is greatly decreased, and the electrical conductivity of the conductive electrode unit 300 is increased. .

As described above, according to the method for manufacturing a transparent electrode according to the present invention, it is possible to manufacture a transparent electrode having a conductive electrode unit in a single process, to produce a conductive ink and to print the conductive electrode unit without a sintering process, And the efficiency of the transparent electrode manufacturing process can be greatly increased.

While the invention has been described with reference to a limited number of embodiments, it is to be understood that the invention is not limited to the disclosed 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.

100: substrate 200: transparent electrode portion
300: conductive electrode part 400: silver nano wire
500: silver nanoparticles

Claims (5)

Preparing a first conductive ink in which silver nano wires are dispersed (first step);
(Step 2) of producing a second conductive ink in which silver nanowires and silver nanoparticles are dispersed;
Printing the first conductive ink on the substrate to produce a transparent electrode portion (third step); And
(Step 4) of printing the second conductive ink on at least one side of the substrate on which the transparent electrode part is printed, in succession to the manufacturing step of the transparent electrode part (third step) A method of manufacturing a transparent electrode. The method of claim 1, wherein the second conductive ink is prepared by adding 0.005 to 1 part by weight of silver nanowires and 1 to 20 parts by weight of silver nanoparticles to 100 parts by weight of solvent. The method according to claim 1, wherein the method of printing the transparent electrode part in the third step is a printing method selected from the group consisting of an ink jet method, a bar coating method and a spray method. Gt; The method according to claim 1, wherein the method of printing the conductive electrode portion in the third step is any one selected from the group consisting of screen printing, offset printing, roll to roll printing, spray printing, roll to sheet printing, gravure printing, In the transparent electrode layer. [2] The method of claim 1, wherein the conductive electrode unit comprises 5 to 60 wt% of silver nanowires.

KR1020140160807A 2014-11-18 2014-11-18 Preparing method of transparent electrode KR20160059215A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101961196B1 (en) * 2017-09-27 2019-03-22 주식회사 에스나노텍 Ag nanowire embedded transparent electrode manufacturing method and the transparent electrode thereby
KR20190036211A (en) * 2017-09-27 2019-04-04 한국화학연구원 Light sintering conductive electrode, and method of manufacturing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101961196B1 (en) * 2017-09-27 2019-03-22 주식회사 에스나노텍 Ag nanowire embedded transparent electrode manufacturing method and the transparent electrode thereby
KR20190036211A (en) * 2017-09-27 2019-04-04 한국화학연구원 Light sintering conductive electrode, and method of manufacturing the same

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