KR20160007273A - Transparent Conductive Coating Composition and Transparent Electrode Using the Same - Google Patents

Transparent Conductive Coating Composition and Transparent Electrode Using the Same Download PDF

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KR20160007273A
KR20160007273A KR1020140087698A KR20140087698A KR20160007273A KR 20160007273 A KR20160007273 A KR 20160007273A KR 1020140087698 A KR1020140087698 A KR 1020140087698A KR 20140087698 A KR20140087698 A KR 20140087698A KR 20160007273 A KR20160007273 A KR 20160007273A
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coating composition
conductive coating
transparent conductive
graphene
transparent electrode
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최한영
장원영
채승진
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동우 화인켐 주식회사
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Abstract

The present invention provides: a transparent conductive coating composition comprising silver nanowires and graphene; and a transparent electrode using the same. The transparent conductive coating composition according to the present invention shows excellent transmittance and conductivity.

Description

투명 전도성 코팅 조성물 및 이를 이용한 투명 전극 {Transparent Conductive Coating Composition and Transparent Electrode Using the Same}TECHNICAL FIELD [0001] The present invention relates to a transparent conductive coating composition and a transparent electrode using the transparent conductive coating composition and a transparent electrode using the transparent conductive coating composition.

본 발명은 투명 전도성 코팅 조성물 및 이를 이용한 투명 전극에 관한 것으로, 보다 상세하게는 우수한 투과율과 전도성을 나타내는 투명 전도성 코팅 조성물 및 이를 이용한 투명 전극에 관한 것이다.The present invention relates to a transparent conductive coating composition and a transparent electrode using the transparent conductive coating composition. More particularly, the present invention relates to a transparent conductive coating composition exhibiting excellent transmittance and conductivity and a transparent electrode using the transparent conductive coating composition.

투명전극은 LCD(liquid crystal display), PDP(plasma display panel), OLED(organic light emitting diode) 등과 같은 평판 디스플레이와 터치 패널, 전자파 차폐막, 정전기 방지막, 열반사막, 면발열체, 광전변환소자 등 다양한 분야에서 적용되고 있다.The transparent electrode can be applied to various fields such as a flat panel display such as a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting diode (OLED), a touch panel, an electromagnetic wave shielding film, an antistatic film, .

이러한 투명전극은 일반적으로 인듐산화주석(indium tin oxide, ITO)을 이용하여 제조되는데, 인듐산화주석을 이용하여 제조되는 투명전극은 플렉시블 소자에 적용할 때, 외부에서 스트레스(stress)를 주거나 구부렸을 때 쉽게 파괴되는 문제가 발생한다. 또한 ITO의 주재료인 인듐은 고가일 뿐만 아니라 자원 고갈로 인해 이를 대체할 물질이 필요하다.Such a transparent electrode is generally manufactured by using indium tin oxide (ITO). When a transparent electrode manufactured using indium tin oxide is applied to a flexible device, it is stressed or curved from the outside The problem is easily destroyed. In addition, indium, which is the main material of ITO, is not only expensive, but also needs a substitute material due to resource depletion.

이러한 관점에서 투명전극으로 전도성 고분자, 탄소나노튜브, 그래핀, 금속 나노와이어를 사용하는 기술에 관심이 모아지고 있다. 이들 중 금속 나노와이어의 일종인 은 나노와이어는 직경이 50 나노미터 이하로 매우 작으면서 길이가 10 마이크로미터 이상으로 길게 만들 수 있어 ITO를 대체할 수 있는 대표적인 물질 중의 하나로 각광을 받고 있다. From this point of view, attention has been focused on the use of conductive polymers, carbon nanotubes, graphenes, and metal nanowires as transparent electrodes. Among them, silver nanowires, which are a kind of metal nanowires, can be made to have a length of 10 micrometers or longer while their diameters are as small as 50 nanometers or less, and they are widely regarded as one of representative materials that can replace ITO.

대한민국 등록특허 제10-1386362호에는 투명 기판 상에 형성된 은 나노와이어 네트워크 층 및 상기 은 나노와이어 네트워크층 상에 형성된 그래핀 층을 포함하고, 상기 은 나노와이어 네트워크 층을 구성하는 은 나노와이어는 적어도 한 지점 이상에서 다른 은 나노와이어와 용융 과정을 거쳐 접합 또는 교차되어 연결된 은 나노와이어 네트워크-그래핀 적층형 투명전극 소재가 개시되어 있다. 그러나, 상기 투명전극 소재는 은 나노와이어 네트워크 층을 형성한 다음 그래핀 층을 적층하는 공정과 광소결 공정을 거쳐야 하므로, 제조 공정이 복잡한 문제점이 있었다.Korean Patent No. 10-1386362 discloses a silver nanowire network layer formed on a transparent substrate and a graphene layer formed on the silver nanowire network layer, wherein the silver nanowires constituting the silver nanowire network layer include at least A silver nanowire network-graphene stacked transparent electrode material is disclosed that is bonded to or crossed with another silver nanowire through a melting process at more than one point. However, the transparent electrode material has a complicated manufacturing process because a silver nanowire network layer is formed and a graphene layer is laminated and a light sintering process is performed.

대한민국 등록특허 제10-1386362호Korean Patent No. 10-1386362

본 발명은 상기와 같은 문제점을 해결하기 위한 것으로, 본 발명의 한 목적은 우수한 투과율과 전도성을 나타내는 투명 전도성 코팅 조성물을 제공하는 것이다.SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a transparent conductive coating composition exhibiting excellent transmittance and conductivity.

본 발명의 다른 목적은 상기 투명 전도성 코팅 조성물을 이용하여 형성되는 투명 전극을 제공하는 것이다.Another object of the present invention is to provide a transparent electrode formed using the transparent conductive coating composition.

본 발명의 또 다른 목적은 상기 투명 전극을 포함하는 전자장치를 제공하는 것이다.Still another object of the present invention is to provide an electronic device including the transparent electrode.

한편으로, 본 발명은 은 나노와이어 및 그래핀을 포함하는 투명 전도성 코팅 조성물을 제공한다.On the other hand, the present invention provides a transparent conductive coating composition comprising silver nanowires and graphene.

본 발명의 일 실시형태에서, 상기 그래핀은 엣지 부위가 카르복시산기로 치환된 그래핀인 것을 특징으로 한다.In an embodiment of the present invention, the graphene is characterized in that the edge portion is graphene substituted with a carboxylic acid group.

본 발명의 일 실시형태에서, 상기 은 나노와이어와 그래핀의 중량비는 1:1 내지 100:1인 것을 특징으로 한다.In one embodiment of the present invention, the weight ratio of the silver nanowire and the graphene is 1: 1 to 100: 1.

다른 한편으로, 본 발명은 상기 투명 전도성 코팅 조성물을 이용하여 형성되는 투명 전극을 제공한다.On the other hand, the present invention provides a transparent electrode formed using the transparent conductive coating composition.

또 다른 한편으로, 본 발명은 상기 투명전극을 구비한 전자장치를 제공한다.On the other hand, the present invention provides an electronic device having the transparent electrode.

본 발명의 투명 전도성 코팅 조성물은 단순한 코팅 공정에 의해 투과율과 전도성이 우수한 투명 전극을 제조할 수 있으며, 은 나노와이어 또는 그래핀만을 포함하는 투명 전도성 코팅 조성물에 비해 우수한 전도성을 나타낸다.
The transparent conductive coating composition of the present invention can produce a transparent electrode having excellent transmittance and conductivity by a simple coating process and exhibits excellent conductivity compared to a transparent conductive coating composition containing only silver nanowires or graphene.

이하, 본 발명을 보다 상세히 설명한다.
Hereinafter, the present invention will be described in more detail.

본 발명의 일 실시형태는 은 나노와이어 및 그래핀을 포함하는 투명 전도성 코팅 조성물에 관한 것이다.
One embodiment of the present invention is directed to a transparent conductive coating composition comprising silver nanowires and graphene.

본 발명의 일 실시형태에서, 상기 은 나노와이어의 평균 길이는 0.1~10㎛인 것이 바람직하며, 0.2~5㎛인 것이 보다 바람직하다. 0.1㎛ 미만이면 전도성이 떨어지고, 10㎛ 초과인 경우 응집이 과다하게 일어나 투명성에 문제가 있을 수 있다. 또한 상기 은 나노와이어의 평균 직경은 1~100nm인 것이 바람직하며, 5~50nm 인 것이 보다 바람직하다. 1nm 미만이면 전도성이 떨어지고, 100nm 초과인 경우 광투과율을 저하시킬 수 있다.In one embodiment of the present invention, the average length of the silver nanowires is preferably 0.1 to 10 mu m, more preferably 0.2 to 5 mu m. When the thickness is less than 0.1 탆, the conductivity decreases. When the thickness exceeds 10 탆, aggregation occurs excessively, which may cause a problem in transparency. The average diameter of the silver nanowires is preferably 1 to 100 nm, more preferably 5 to 50 nm. When the thickness is less than 1 nm, the conductivity is deteriorated. When the thickness is more than 100 nm, the light transmittance may be deteriorated.

은 나노와이어의 제조방법에는 특별한 제한이 없으며, 공지의 제조방법, 예를 들어 Adv. Mater. 2002. 14, p833~837에 기재된 제조방법을 이용할 수 있다.
There is no particular limitation on the method of manufacturing the nanowires, and known manufacturing methods, for example, Adv. Mater. 2002. 14, p.833 to 837 can be used.

본 발명의 일 실시형태에서, 상기 그래핀은 그래핀 또는 엣지 부위가 카르복시산기로 치환된 그래핀일 수 있다.In one embodiment of the present invention, the graphene may be graphene or graphene whose edge portion is substituted with a carboxylic acid group.

상기 그래핀 및 엣지 부위가 카르복시산기로 치환된 그래핀의 제조방법은 특별히 제한되는 것은 아니며, 공지의 방법, 예를 들어 대한민국 공개특허 제10-2014-0008590호에 개시된 제조방법을 이용할 수 있다.The method for producing the graphene in which the graphene and edge portions are substituted with carboxylic acid groups is not particularly limited, and a known method such as the method disclosed in Korean Patent Laid-Open Publication No. 10-2014-0008590 can be used.

구체적으로, 엣지 부위가 카르복시산기로 치환된 그래핀은 흑연을 분산함과 동시에 액체, 초임계 또는 아임계 이산화탄소와 반응시킨 후, 산으로 처리하여 제조할 수 있다. 또한, 그래핀은 상기 엣지 부위가 카르복시산기로 치환된 그래핀을 공기 또는 비활성 가스 분위기에서 환원시켜 상기 엣지 부위의 카르복시기를 제거하여 제조할 수 있다.Specifically, graphene in which an edge portion is substituted with a carboxylic acid group can be produced by dispersing graphite and reacting with liquid, supercritical or subcritical carbon dioxide, followed by treatment with an acid. Further, graphene can be produced by reducing graphene in which the edge portion is substituted with a carboxylic acid group in air or an inert gas atmosphere to remove the carboxyl group at the edge portion.

본 발명의 일 실시형태에서, 상기 그래핀은 엣지 부위가 카르복시산기로 치환된 그래핀이다.In one embodiment of the present invention, the graphene is graphene whose edge portion is substituted with a carboxylic acid group.

상기 엣지 부위가 카르복시산기로 치환된 그래핀은 수계 분산 용매에서 용해성이 향상되어 분산성이 우수한 투명 전도성 코팅 조성물을 제조할 수 있다.
The graphene in which the edge portion is substituted with a carboxylic acid group can prepare a transparent conductive coating composition having improved solubility in an aqueous dispersion solvent and excellent in dispersibility.

본 발명의 일 실시형태에 따른 투명 전도성 코팅 조성물에 사용할 수 있는 용매는 수계 분산 용매일 수 있다. 상기 수계 분산 용매라 함은 물 또는 물과의 상용성이 뛰어난 용매를 의미한다. 예를 들면, 물, 메탄올, 에탄올, 부탄올, 프로판올, 이소프로판올 등의 알코올계 용매, 1,4-디옥산, 테트라히드로푸란(THF) 등의 에테르계 용매, 피리딘, 피라진, 피롤 등의 방향족 복소환 화합물계 용매, N,N-디메틸포름아미드(DMF), N,N-디메틸아세트아미드(DMA) 등의 아미드계 용매, 아세토니트릴 등의 니트릴계 용매, 아세트알데히드 등의 알데히드계 용매 등을 들 수 있고, 이들 중 1종 또는 2종 이상을 혼합하여 사용할 수 있다.
The solvent that can be used in the transparent conductive coating composition according to one embodiment of the present invention can be used for aqueous dispersion. The aqueous dispersing solvent means a solvent having excellent compatibility with water or water. Examples of the solvent include alcohol solvents such as water, methanol, ethanol, butanol, propanol and isopropanol; ether solvents such as 1,4-dioxane and tetrahydrofuran (THF); aromatic heterocyclic rings such as pyridine, Amide solvents such as N, N-dimethylformamide (DMF) and N, N-dimethylacetamide (DMA), nitrile solvents such as acetonitrile, and aldehyde solvents such as acetaldehyde And one or more of these may be used in combination.

본 발명의 일 실시형태에서, 상기 은 나노와이어 및 그래핀은 상기 투명 전도성 코팅 조성물 중 고형분 100 중량부에 대하여 50 내지 100 중량부, 바람직하게는 90 내지 99 중량부로 포함될 수 있다.In one embodiment of the present invention, the silver nanowire and the graphene may be contained in an amount of 50 to 100 parts by weight, preferably 90 to 99 parts by weight, based on 100 parts by weight of the solid content in the transparent conductive coating composition.

본 발명의 일 실시형태에서, 상기 은 나노와이어와 그래핀의 중량비는 1:1 내지 100:1, 바람직하게는 5:1 내지 30:1일 수 있다. 중량비가 1:1 미만이거나, 100:1 초과인 경우에는 전도성의 부족이 발생될 수 있다.
In one embodiment of the present invention, the silver nanowire to graphene weight ratio may be from 1: 1 to 100: 1, preferably from 5: 1 to 30: 1. If the weight ratio is less than 1: 1 or more than 100: 1, a shortage of conductivity may occur.

본 발명의 일 실시형태에 따른 투명 전도성 코팅 조성물은 분산제를 추가로 포함할 수 있다.The transparent conductive coating composition according to one embodiment of the present invention may further comprise a dispersing agent.

상기 분산제로는 이온성 또는 비이온성 계면활성제 등을 사용할 수 있으며, 상기 투명 전도성 코팅 조성물 100 중량부에 대하여 1 내지 50 중량부, 바람직하게는 1 내지 10 중량부로 포함될 수 있다.
As the dispersing agent, an ionic or nonionic surfactant may be used. The dispersant may be included in an amount of 1 to 50 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the transparent conductive coating composition.

본 발명의 일 실시형태는 상술한 투명 전도성 코팅 조성물을 이용하여 형성되는 투명 전극에 관한 것이다. 본 발명의 일 실시형태에 따른 투명 전극은 투명 기판 상에 상술한 투명 전도성 코팅 조성물을 도포하고 건조 또는 경화하여 전도성 박막을 형성시킴으로써 제조할 수 있다.
One embodiment of the present invention relates to a transparent electrode formed using the transparent conductive coating composition described above. A transparent electrode according to an embodiment of the present invention can be produced by applying the above-mentioned transparent conductive coating composition on a transparent substrate and drying or curing it to form a conductive thin film.

본 발명의 일 실시형태에서, 상기 투명 기판은 베이스 필름이 폴리에스테르계, 폴리카보네이트계, 폴리에테르설폰계 및 아크릴계 고분자 중에서 선택되는 고분자 필름 또는 유리 기판이 사용될 수 있다. 예를 들어 투명 전극에 플렉서블한 특성이 요구된다면 상기 투명 기판으로 고분자 필름을 사용할 수 있으며, 그렇지 않은 경우에는 유리 기판이 적용될 수 있다.
In one embodiment of the present invention, the transparent substrate may be a polymer film or a glass substrate in which the base film is selected from a polyester type, a polycarbonate type, a polyether sulfone type, and an acrylic type polymer. For example, if the transparent electrode is required to have a flexible characteristic, a polymer film can be used as the transparent substrate. Otherwise, a glass substrate can be used.

상기 투명 기판의 두께는 구체적으로 10 내지 10,000㎛일 수 있다.
The thickness of the transparent substrate may be 10 to 10,000 mu m.

상기 도포 방법에 특별한 제한은 없으며, 예를 들어 파운틴 코팅법, 다이 코팅법, 스핀 코팅법, 스프레이 코팅법, 그라비아 코팅법, 롤 코팅법, 바 코팅법 등을 사용할 수 있다. There is no particular limitation on the coating method, and for example, a fountain coating method, a die coating method, a spin coating method, a spray coating method, a gravure coating method, a roll coating method and a bar coating method can be used.

상기 투명 기판에 투명 전도성 코팅 조성물을 도포한 후에는 자연 건조, 열 건조 또는 자외선에 의해 경화시킨다. After the transparent conductive coating composition is applied to the transparent substrate, it is cured by natural drying, thermal drying or ultraviolet light.

상기 투명 전도성 코팅 조성물로부터 형성되는 전도성 박막의 두께는 5 내지 500nm인 것이 바람직하다. 5nm 미만에서는 충분한 전도성을 얻기 어렵고, 500nm 초과인 경우 투과율이 저하되는 문제가 있다.
The thickness of the conductive thin film formed from the transparent conductive coating composition is preferably 5 to 500 nm. When it is less than 5 nm, it is difficult to obtain sufficient conductivity, and when it exceeds 500 nm, the transmittance is lowered.

본 발명의 일 실시형태는 상기 투명전극을 구비한 전자장치에 관한 것이다.One embodiment of the present invention relates to an electronic apparatus having the transparent electrode.

상기 전자장치는 투명전극을 포함하는 장치라면 제한되지 않으며, 예를 들어 액정표시장치, 전자종이표시장치, 유기전계발광소자, 태양전지 등일 수 있다.The electronic device is not limited as long as it is a device including a transparent electrode, and may be, for example, a liquid crystal display device, an electronic paper display device, an organic electroluminescent device, a solar cell, or the like.

상기 전자장치는 본 발명에 따른 투명전극을 포함하는 것을 제외하고는 당해 분야의 일반적인 구성을 포함하며, 이에 대한 상세한 설명은 생략하기로 한다.
The electronic device includes a general structure in the related art except for including a transparent electrode according to the present invention, and a detailed description thereof will be omitted.

이하, 실시예, 비교예 및 실험예에 의해 본 발명을 보다 구체적으로 설명하고자 한다. 이들 실시예, 비교예 및 실험예는 오직 본 발명을 설명하기 위한 것으로, 본 발명의 범위가 이들에 국한되지 않는다는 것은 당업자에게 있어서 자명하다.
Hereinafter, the present invention will be described more specifically with reference to Examples, Comparative Examples and Experimental Examples. It should be apparent to those skilled in the art that these examples, comparative examples and experimental examples are only for illustrating the present invention, and the scope of the present invention is not limited thereto.

실시예 1: 투명 전극의 제조Example 1: Preparation of transparent electrode

은 나노와이어(캠브리오스사, 고형분 0.1% 은 나노와이어 수분산액) 10 중량부 및 엣지 부위가 카르복시산기로 치환된 그래핀(나노켐택사, 말단 카르복시화 그래핀 고형분 0.1% 수분산액) 1 중량부를 물 10 중량부에 넣고, 분산제로서 폴리비닐알콜수지(일본합성사, Z-200의 0.1% 수용액) 1 중량부를 혼합하고 교반하여 투명 전도성 코팅 조성물을 제조하였다., 10 parts by weight of silver nanowire (Cambriosia, 0.1% solids in water dispersion of nanowires) and 1 part by weight of graphene (NANOCEMETHASE, terminal carboxymethylated graphene solid 0.1% aqueous dispersion) , And 1 part by weight of a polyvinyl alcohol resin (0.1% aqueous solution of Z-200 manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) as a dispersant was mixed and stirred to prepare a transparent conductive coating composition.

상기 투명 전도성 코팅 조성물을 두께 100㎛의 폴리에틸렌테레프탈레이트(PET) 필름 상에 스핀 코팅법으로 도포한 후, 120℃에서 30분간 가열하여 상기 투명 전도성 코팅 조성물의 고형분이 필름 상에 0.005g/㎡가 되도록 투명 전극을 제조하였다.
The transparent conductive coating composition was coated on a polyethylene terephthalate (PET) film having a thickness of 100 탆 by spin coating, and then heated at 120 캜 for 30 minutes so that the solid content of the transparent conductive coating composition was 0.005 g / A transparent electrode was prepared as much as possible.

실시예 2: 투명 전극의 제조Example 2: Preparation of transparent electrode

은 나노와이어 10 중량부 및 엣지 부위가 카르복시산기로 치환된 그래핀 2 중량부를 사용한 것을 제외하고는, 실시예 1과 동일한 방법으로 투명 전극을 제조하였다.
A transparent electrode was prepared in the same manner as in Example 1 except that 10 parts by weight of the nanowire and 2 parts by weight of graphene whose edge portion was substituted with a carboxylic acid group were used.

실시예 3: 투명 전극의 제조Example 3: Preparation of transparent electrode

은 나노와이어 10 중량부 및 엣지 부위가 카르복시산기로 치환된 그래핀 0.5 중량부를 사용한 것을 제외하고는, 실시예 1과 동일한 방법으로 투명 전극을 제조하였다.
A transparent electrode was prepared in the same manner as in Example 1 except that 10 parts by weight of the nanowire and 0.5 part by weight of graphene whose edge portion was substituted with a carboxylic acid group were used.

실시예 4: 투명 전극의 제조Example 4: Preparation of transparent electrode

분산제로서 폴리비닐알콜수지 1 중량부 대신에 5 중량부를 사용한 것을 제외하고는, 실시예 1과 동일한 방법으로 투명 전극을 제조하였다.
A transparent electrode was prepared in the same manner as in Example 1, except that 5 parts by weight of polyvinyl alcohol resin was used instead of 1 part by weight of dispersant.

비교예 1: 투명 전극의 제조Comparative Example 1: Production of transparent electrode

은 나노와이어를 사용하지 않고, 엣지 부위가 카르복시산기로 치환된 그래핀(나노켐택사, 말단 카르복시화 그래핀 고형분 0.1% 수분산액) 1 중량부를 물 10 중량부에 넣고, 분산제로서 폴리비닐알콜수지(일본합성사, Z-200의 0.1% 수용액) 1 중량부를 혼합하고 교반하여 제조한 투명 전도성 코팅 조성물을 이용하여, 실시예 1과 동일한 방법으로 투명 전극을 제조하였다.
1 part by weight of graphene (NanoChem Tacker, 0.1% aqueous dispersion of terminal carboxy graphene solid) having an edge portion substituted with a carboxylic acid group was added to 10 parts by weight of water and a polyvinyl alcohol resin Manufactured by Nippon Synthetic Chemical Industry Co., Ltd., 0.1% aqueous solution of Z-200) were mixed and stirred to prepare a transparent electrode in the same manner as in Example 1, using the transparent conductive coating composition.

비교예 2: 투명 전극의 제조Comparative Example 2: Preparation of transparent electrode

그래핀을 사용하지 않고, 은 나노와이어(캠브리오스사, 고형분 0.1% 은 나노와이어 수분산액) 10 중량부를 물 10 중량부에 넣고, 분산제로서 폴리비닐알콜수지(일본합성사, Z-200의 0.1% 수용액) 1 중량부를 혼합하고 교반하여 제조한 투명 전도성 코팅 조성물을 이용하여, 실시예 1과 동일한 방법으로 투명 전극을 제조하였다.
10 parts by weight of silver nanowire (Cambrios, solid solution 0.1% of nanowire water dispersion) was added to 10 parts by weight of water, and 0.1 part by weight of polyvinyl alcohol resin (0.1% by weight of Z- Aqueous solution) were mixed and stirred to prepare a transparent electrode in the same manner as in Example 1. The transparent conductive coating composition was prepared as follows.

실험예 1: 투과율 및 전도성 평가Experimental Example 1: Evaluation of transmittance and conductivity

상기 실시예 및 비교예에서 수득한 투명 전극의 투과율 및 전도성을 하기 방법에 따라 평가하여, 그 결과를 하기 표 1에 나타내었다.
The transmittance and conductivity of the transparent electrode obtained in the above Examples and Comparative Examples were evaluated according to the following methods, and the results are shown in Table 1 below.

(1) 투과율 평가(1) Evaluation of transmittance

시마즈사제 UV-3100PC 장비를 이용하여, 500nm 파장에서의 투명 전극의 투과율을 측정하였다.The transmittance of the transparent electrode at a wavelength of 500 nm was measured using a UV-3100PC instrument manufactured by Shimadzu Corporation.

<평가 기준><Evaluation Criteria>

투과율 90% 이상: ○Transmittance 90% or more: ○

투과율 80 이상 90% 미만: △Transmittance 80 or more and less than 90%:?

투과율 80% 미만: ×
Transmittance less than 80%: x

(2) 전도성 평가(2) Conductivity evaluation

투명 전극의 도전층의 표면 저항을 Loresta GP TCP-T250(미쓰비시 화학 (주))을 사용하여 4 단자법에 의해 측정하고, 얻어진 표면 저항값과 막 두께로부터 하기 수학식 1에 의해 전도성을 산출하였다.The surface resistance of the conductive layer of the transparent electrode was measured by the four-terminal method using Loresta GP TCP-T250 (Mitsubishi Chemical Co., Ltd.), and the conductivity was calculated from the obtained surface resistance value and film thickness by the following formula .

[수학식 1][Equation 1]

전도성 (S/cm) = 1/{막 두께(㎝) × 표면 저항 (Ω/cm2)}Conductivity (S / cm) = 1 / {film thickness (cm) x surface resistance (? / Cm 2 )}

<평가 기준><Evaluation Criteria>

전도성 100(S/cm) 이상: ○Conductivity 100 (S / cm) or higher: ○

전도성 50(S/cm) 이상 100(S/cm) 미만: △Conductivity 50 (S / cm) to less than 100 (S / cm): Δ

전도성 50(S/cm) 미만: ×
Conductivity Less than 50 (S / cm): x

투과율(%)Transmittance (%) 전도성(S/cm)Conductivity (S / cm) 실시예 1Example 1 실시예 2Example 2 실시예 3Example 3 실시예 4Example 4 비교예 1Comparative Example 1 비교예 2Comparative Example 2 ××

상기 표 1에서 보듯이, 은 나노와이어 및 그래핀을 포함하는 투명 전도성 코팅 조성물을 이용한 실시예 1 내지 4의 투명 전극은 은 나노와이어 및 그래핀 중 하나만을 포함하는 투명 전도성 코팅 조성물을 이용한 비교예 1 내지 2의 투명 전극에 비해, 투과율 및 전도성이 매우 우수함을 확인할 수 있었다.
As shown in Table 1 above, the transparent electrodes of Examples 1 to 4 using a transparent conductive coating composition containing silver nanowires and graphenes were comparative examples using a transparent conductive coating composition containing only one of silver nanowires and graphenes It was confirmed that the transmittance and the conductivity were superior to those of the transparent electrodes of 1 to 2.

이상으로 본 발명의 특정한 부분을 상세히 기술하였는 바, 본 발명이 속한 기술분야에서 통상의 지식을 가진 자에게 있어서 이러한 구체적인 기술은 단지 바람직한 구현예일 뿐이며, 이에 본 발명의 범위가 제한되는 것이 아님은 명백하다. 본 발명이 속한 기술분야에서 통상의 지식을 가진 자라면 상기 내용을 바탕으로 본 발명의 범주 내에서 다양한 응용 및 변형을 행하는 것이 가능할 것이다.It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Do. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

따라서, 본 발명의 실질적인 범위는 첨부된 특허청구범위와 그의 등가물에 의하여 정의된다고 할 것이다. Accordingly, the actual scope of the invention is defined by the appended claims and their equivalents.

Claims (8)

은 나노와이어 및 그래핀을 포함하는 투명 전도성 코팅 조성물.&Lt; / RTI &gt; silver nanowire and graphene. 제1항에 있어서, 그래핀은 엣지 부위가 카르복시산기로 치환된 그래핀인 투명 전도성 코팅 조성물.The transparent conductive coating composition of claim 1, wherein the graphene is graphene substituted at the edge moiety with a carboxylic acid group. 제1항에 있어서, 물 또는 물과의 상용성이 뛰어난 용매를 포함하는 투명 전도성 코팅 조성물.The transparent conductive coating composition according to claim 1, comprising a solvent having excellent compatibility with water or water. 제1항에 있어서, 은 나노와이어와 그래핀의 중량비는 1:1 내지 100:1인 투명 전도성 코팅 조성물.The transparent conductive coating composition of claim 1, wherein the weight ratio of silver nanowire to graphene is from 1: 1 to 100: 1. 제1항에 있어서, 분산제를 추가로 포함하는 투명 전도성 코팅 조성물.The transparent conductive coating composition of claim 1, further comprising a dispersant. 제1항 내지 제5항 중 어느 한 항에 따른 투명 전도성 코팅 조성물을 이용하여 형성되는 투명 전극.A transparent electrode formed using the transparent conductive coating composition according to any one of claims 1 to 5. 제6항에 따른 투명전극을 구비한 전자장치.An electronic device comprising a transparent electrode according to claim 6. 제7항에 있어서, 전자장치는 액정표시장치, 전자종이표시장치, 유기전계발광소자 또는 태양전지인 전자장치.8. The electronic device according to claim 7, wherein the electronic device is a liquid crystal display device, an electronic paper display device, an organic electroluminescent device, or a solar cell.
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KR101386362B1 (en) 2012-09-27 2014-04-16 한국과학기술원 Silver nanowire network―graphene stacked transparent electrode materials, method for fabricationg the same and transparent electrode comprising the same

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