KR101272483B1 - Manufacturing Method of Transparent Conducting Plate using Carbon Nanotubes-Conducting Polymer Hybrid Multilayer - Google Patents

Manufacturing Method of Transparent Conducting Plate using Carbon Nanotubes-Conducting Polymer Hybrid Multilayer Download PDF

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KR101272483B1
KR101272483B1 KR1020100125701A KR20100125701A KR101272483B1 KR 101272483 B1 KR101272483 B1 KR 101272483B1 KR 1020100125701 A KR1020100125701 A KR 1020100125701A KR 20100125701 A KR20100125701 A KR 20100125701A KR 101272483 B1 KR101272483 B1 KR 101272483B1
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substrate
cnt
layer
conductive polymer
solution
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KR20120089500A (en
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최성민
심준보
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한국과학기술원
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Abstract

The present invention relates to a method for manufacturing a transparent conductive plate and a transparent conductive plate produced by the present invention, the present invention comprises the steps of cleaning the surface of the transparent substrate 100 to remove foreign matters; Forming a positive charge layer using aminopropyl dioxide silane (APTES) on the surface of the cleaned substrate 100; Carbon nanotubes (CNT) and polysodium 4-styrene sulfonate (PSS) are mixed in water and subjected to high frequency to produce CNT aqueous solution in which CNTs and PSS mixed in water are evenly dispersed in water. Impregnating the substrate 100 having a charge layer into the CNT aqueous solution to form a CNT layer having a negative charge on the surface of the substrate 100; And impregnating the substrate 100 coated with the CNT layer in a conductive polymer solution made of a conductive polymer having a positive charge, thereby forming a transparent conductive polymer layer on the CNT layer of the substrate 100. Provided is a method of manufacturing a transparent conductive plate material, comprising the step, and a transparent conductive plate material produced thereby.

Description

Manufacturing Method of Transparent Conducting Plate using Carbon Nanotubes-Conducting Polymer Hybrid Multilayer}

The present invention relates to a method for manufacturing a transparent conductive plate using carbon nanotubes and a conductive polymer, and a transparent conductive plate produced by the same, specifically, glass, acrylic plate, polyethylene terephthalate film (hereinafter referred to as "PET film Repeating the coating of carbon nanotubes (hereinafter abbreviated as "CNT") and conductive polymers on a transparent substrate such as "" by dipping, repeating the electrically conductive layer of the thin film The present invention relates to a method of manufacturing a transparent conductive plate material of a new way to have a high light transmittance while having excellent electrical conductivity, and a transparent conductive plate material produced thereby.

The transparent conductive plate material has a thickness or a thin film like a glass plate, and is a core product used in many fields such as a flat panel display panel, a solar cell, a transparent electrode, a touch panel, and an electromagnetic shielding material. In manufacturing such a transparent conductive plate, the conventional metal oxide-based materials are widely used in various fields due to high electrical conductivity and high light transmittance, but it is impossible to manufacture flexible plate that is continuously bent and the price of materials is rising. Disadvantages have limited utility, and there is a need for developing alternative materials. In particular, there is an urgent need for a technology for producing a plate that has excellent electrical conductivity and light transmittance, but also has a large area, is capable of producing a flexible plate that is bent, and is chemically and physically stable. .

The present invention has been developed to meet the needs of the technical field as described above, specifically, by coating a thin alternating coating of CNTs and conductive polymers having a high electrical conductivity in nanometer units to have a high level of electrical conductivity and high light transmittance. An object of the present invention is to provide a technology capable of manufacturing flexible and flexible sheet metal.

In order to achieve the above object, in the present invention, the step of cleaning the surface of the transparent substrate to remove the foreign matter; Forming a positive charge layer using aminopropyl dioxide silane (APTES) on the surface of the cleaned substrate; Carbon nanotubes (CNT) and polysodium 4-styrene sulfonate (PSS) are mixed in water and subjected to high frequency to produce CNT aqueous solution in which CNTs and PSS mixed in water are evenly dispersed in water. Impregnating the substrate (100) having a charge layer into the CNT aqueous solution to form a CNT layer having a negative charge on the surface of the substrate; And impregnating the substrate coated with the CNT layer in a conductive polymer solution made using a conductive polymer having a positive charge, thereby forming a transparent conductive polymer layer on the CNT layer of the substrate 100. Provided are a method of manufacturing a transparent conductive plate material and a transparent conductive plate material produced by such a process.

According to the present invention, since the CNTs are individually separated into strands, and then dispersed and mixed with water to form an aqueous solution, the contact resistance between the CNTs is greatly reduced, and the surface of the substrate is coated to form a CNT layer. In addition, the electrical conductivity of the CNT layer is not only greatly improved, but also the light transmittance is greatly improved while the void space between the CNT networks is greatly increased, thus providing a transparent conductive plate having excellent light transmittance while ensuring high electrical conductivity on the substrate. It has an effect.

In particular, in the present invention, rather than forming a thick layer of CNT at once, by forming a very thin layer of nanometer level repeatedly with a conductive polymer layer in a multi-layer, it is possible to form a very even and uniform coating layer on the substrate surface By controlling the number of laminations of the CNT layer and the conductive polymer layer, the thickness of the entire transparent conductive plate including the substrate and the amount of CNT and the conductive polymer contained can be controlled very finely, thereby controlling the electrical and optical properties of the transparent conductive plate. There is an advantage that can be adjusted as desired by the user.

Furthermore, in the present invention, in stacking the CNT layer into a plurality of layers, the conductive polymer having a surface charge opposite to that of the dispersed CNTs is alternately stacked, thereby making the layer stable and stable due to the strong electrical attraction between the two layers. Bonding can be achieved. This has the advantage of being able to form a rigid and highly durable electrically conductive layer on the substrate.

As such, in the present invention, the CNT and the conductive polymer having excellent electrical conductivity form a complex multilayer network structure, and thus, the transparent conductive plate material according to the present invention has more excellent electrical and optical properties than the conventional transparent conductive plate material.

The transparent conductive plate material of the present invention may be used as a material such as a flat panel display panel, a solar cell, a transparent electrode, a touch panel, or may be used as an electromagnetic shielding material.

1 is a schematic cross-sectional view illustrating a state in which a positive charge layer is formed on a surface of a substrate by treating the surface of the substrate with APTES.
2 is a conceptual diagram illustrating a state in which a PSS having a negative charge is wound on a surface of a SWNT.
FIG. 3 is a schematic conceptual view illustrating a state in which a negatively charged CNT is attached to a surface of a substrate by impregnating a substrate having a positively charged layer in an aqueous CNT solution.
4 is a schematic conceptual view illustrating a state in which a conductive polymer having a positive charge is adsorbed on an outer surface of a CNT layer of a substrate formed by attaching CNTs.
5 and 6 are schematic conceptual views illustrating a state in which the CNTs and the conductive polymer layers are repeatedly formed by additionally coating the CNTs and the conductive polymers onto the substrate on which the CNTs and the conductive polymers are adsorbed.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments illustrated in the drawings, it is described as one embodiment, whereby the technical spirit of the present invention and its core configuration and operation are not limited.

In the present invention, the surface of the transparent substrate 100 is treated to have a positive charge, and then, the surface of the substrate 100 is coated with a well dispersed CNT that is treated to have a negative charge, and then By coating the conductive polymer treated to have a positive (+), and by repeating the coating of the CNT coating and the conductive polymer to produce a transparent conductive plate excellent in electrical and optical performance.

Looking at the method of manufacturing a transparent electromagnetic shielding material in accordance with the present invention in detail with reference to the drawings, first prepare a substrate 100 to remove foreign substances on the surface. In addition, a process of chemically functionalizing the surface of the substrate 100, that is, a molecule having a positive charge (NH + in the following embodiment) after the OH group adheres to the surface of the substrate 100 as described below A process of attaching to the surface of 100 is performed. In the present invention, the substrate 100 may be transparent glass, acrylic, synthetic resin film, PET film and the like, but is not limited thereto.

Specifically, after cleaning the surface of the prepared substrate 100, the substrate 100 is immersed in the OH group attachment solution to further remove foreign substances on the surface and at the same time chemically attached to the surface of the substrate 100. As the OH group adhesion solution used at this time, it is preferable to use a solution in which H 2 SO 4 and H 2 O 2 at a 30% mass concentration are mixed at a ratio of 3: 1 by volume ratio. The OH group attachment solution of the above composition has a very strong acidity, so care should be taken in handling. When the prepared substrate is immersed in the OH group attachment solution, the OH group attachment solution is first heated to about 70 ° C., and then the substrate 100 is immersed in the prepared OH group attachment solution for about 30 minutes. When heating the solution for attaching OH groups, it is preferable to use a water bath method.

As such, when the OH group attachment solution is prepared and the substrate 100 in the cleaned state is immersed in the OH group attachment solution, various surfaces of the substrate 100 are removed as well as chemically attached to the surface. do.

The surface of the substrate 100 is cleaned and treated with aminopropyltriethoxy silane (hereinafter abbreviated as "APTES") to the substrate 100 prepared with OH groups attached to the cleaned surface. A process is performed to allow the formation of a positive charge layer.

To this end, first, a solution containing APTES is prepared. For example, the APTES solution is prepared by adding 1% volume of APTES to toluene. The prepared APTES solution is heated, preferably at a heating temperature of about 60 ° C. At this time, it is preferable to use a water bath method when heating the APTES solution. The prepared substrate 100 is immersed in the heated APTES solution. After immersing the substrate 100 in APTES solution for a predetermined time (about 4 minutes), the substrate 100 is taken out and washed. It is good to clean the substrate 100 using toluene and water.

As such, when the substrate 100 having the OH group attached to the surface is impregnated in the APTES solution, the positive charge layer 10 is formed while the NH + group is chemically bonded to the surface of the substrate 100. FIG. 1 is a schematic cross-sectional view illustrating a state in which a positive charge layer 10 is formed on a surface of the substrate 100 by treating the surface of the substrate 100 with APTES.

As such, the CNT, which is a highly conductive material, is subsequently coated on the substrate 100 having the positive charge layer 10 formed by impregnation with the APTES solution and the surface having the positive charge. To this end, in the present invention, a CNT aqueous solution is prepared, and a process of impregnating the prepared CNT aqueous solution with the substrate 100 on which the positive charge layer 10 is formed is performed.

As a coating material, CNTs are not hydrophobic due to their hydrophobic surface and are present as a bundle, rather than as individual strands, due to the strong van der Waals attraction between CNTs and CNTs. The properties of CNTs not only make it difficult to make CNT aqueous solution, but also impede the development of electrical properties even after coating the substrate 100 with CNT by impregnating the substrate 100 with CNT aqueous solution.

In order to solve this problem, in the present invention, when preparing a CNT aqueous solution, by performing a powerful ultrasonic grinding process for the CNTs that are bundled in a bundle, to separate the CNTs in the individual strands, and with hydrophilicity And encapsulating polysodium 4-styrene sulfonate (hereinafter, abbreviated as "PSS"), a polymer having negative charge characteristics, on the surface of the CNT, thereby improving the dispersibility of the CNT. A modification of the CNTs is performed, which changes the surface of the CNTs to hydrophilicity. That is, in the present invention, by mixing the CNT and PSS in water and dispersing the particles mixed in the water by using a high frequency disperser (Ultra Sonicator) or the like, the CNT is evenly dispersed in the water while wrapped in the PSS It will make a CNT aqueous solution.

CNTs can be broadly divided into single-walled carbon nanotubes (hereinafter referred to as "SWNT") and multi-walled carbon nanotubes (hereinafter referred to as "MWNT"). Although, the electrical properties of the SWNT is much better than the MWNT, it is preferable to use SWNT as the CNT to be used in the CNT aqueous solution. In the specific manufacturing process, SWNT is added to the water together with the PSS polymer at a mass concentration of 0.2%. In the case of the PSS polymer, there are various types depending on the molecular weight, it is preferable to use a molecular weight of 70,000. At this time, the ratio of SWNT and PSS polymer is very important. If the amount of PSS polymer is too high, the amount of PSS polymer which is not bonded with SWNT increases in solution, which lowers the electrical conductivity (PSS itself is a non-conductor, which has very low electrical conductivity. On the contrary, if the amount of PSS is too small, the PSSs may not be sufficiently bonded to the SWNTs, so that the dispersion and surface charge modification of the SWNTs may not be performed properly. Therefore, in the present invention, it is preferable to put SWNT and PSS in water at a ratio of 1: 1 by mass ratio.

As such, when an aqueous solution in which SWNT and PSS are mixed is prepared, dispersion is performed by irradiating high frequency waves. Specifically, by irradiating high frequency to the aqueous solution mixed with the SWNT and PSS by the water tank-type high-frequency disperser to perform a dispersion operation for about 30 minutes, and further irradiated with a high frequency through the tip-type high-frequency disperser to strongly disperse for about 1 hour It is preferable to perform the dispersion operation for 30 minutes using the tank-type high- parking disperser. Through such a high-frequency dispersion process, a number of SWNTs that existed as a bunch of bundles are separated into individual strands, and PSSs are enclosed and adsorbed on the surface of each separated SWNT. 2 conceptually illustrates a state in which the PSS 22 is wound on the surface of the SWNT 21 that is separated separately. The SWNTs 21 enclosed in the PSSs 22 do not stick back to the bundled bundles due to the PSSs 22 on the surface, and thus maintain the separated states, and have hydrophilicity and negative charge characteristics. The solution thus prepared is abbreviated as "PSS-SWNT aqueous solution" in the present specification, and the PSS-SWNT aqueous solution is finally purified through a high-speed centrifuge. Specifically, the aqueous solution of PSS-SWNT is placed in a high-speed centrifuge and subjected to a centrifugal force of about 10,000G and centrifuged for about 1 hour. This process causes the SWNT and PSS masses, which were not well dispersed individually, to separate from the solution as they sink downward. Discard the separated SWNT mass and PSS mass and use only the part of the well-dispersed PSS-SWNT aqueous solution that is present at the top for coating.

In order for the CNT layer to have electrical conductivity and to be used as the material of the conductive plate, the CNTs must be intricately intertwined to form a network. However, when the bundled CNTs are used, the contact resistance between the CNTs and the CNTs is increased more than when they are separated separately, resulting in low electrical conductivity and a sharp decrease in optical transparency due to the bundled CNTs. have. In the present invention, as described above, instead of simply mixing the CNTs in water, the CNTs are treated separately to form separate strands, and then mixed in water to form an aqueous solution, thereby greatly reducing the contact resistance between the CNTs. When coated on the surface of the substrate 100 to form a CNT layer, not only the electrical conductivity of the CNT layer is greatly improved, but also the light transmittance is greatly improved while the void space between the CNT networks is greatly increased. Therefore, it is possible to form a transparent conductive plate having high electrical conductivity and excellent light transmittance.

In addition to forming a CNT layer by impregnating the substrate 100 with the CNT aqueous solution, it is necessary for the user to make a uniform and uniform layer in addition to forming multiple CNT layers rather than forming a thick CNT layer at once. It is also very advantageous in that the CNT layer of thickness can be formed to adjust the electrical conductivity and transparency as needed. In order to make a thin CNT layer of several layers, in the present invention, a conductive polymer solution, which is another charged material having a positive charge, is prepared by separately preparing a CNT aqueous solution having a negative charge. The conductive polymer layer is coated on the transparent layer. Continual coating of the same material with the same charge is very difficult due to the electrical repulsive force between the materials.

Typical polymers can also be used to form multilayer structures by coating between CNT layers if they have a positive charge. However, the general polymer is an electrical insulator and has a very low electrical conductivity, which is not suitable for manufacturing a conductive plate. Therefore, in the present invention, a conductive polymer solution having high electrical conductivity while having a positive charge was prepared and used. A conductive polymer solution having a positive charge and high electrical conductivity is typically polyaniline, and poly 3,4-ethylenedioxythiophene / Hereinafter, a poly 3,4-ethylenedioxythiophene-polyethylene glycol block hybrid polymer (Poly (3,4-ethylenedioxythiophene) -block-poly (ethylene glycol) / perchlorate) made using "PEDOT" Impurity added / hereinafter abbreviated as "PEDOT-PEG") also has good properties for this purpose. The dual PEDOT-PEG is a polymer material having high electrical conductivity, high optical transparency and positive charge, and suitable for use in the purpose of the present invention. However, since it is insoluble in water, in the present invention, a solution in which PEDOT-PEG is dissolved in propylene carbonate (Propylene Carbonate) (hereinafter, abbreviated as "PEDOT-PEG solution") is used and used as a conductive polymer solution. At this time, the PEDOT-PEG concentration in the conductive polymer solution is preferably about 0.0005% by mass concentration. If the concentration of PEDOT-PEG is higher than 0.0005%, it is not preferable because the optical characteristics of the PEDOT itself are rapidly degraded.

 When the surface treatment is completed with APTES and the positive electrode layer 10 is stacked on the surface, the substrate 100, the CNT aqueous solution, and the conductive polymer solution are prepared. The substrate 100 is alternated between the CNT aqueous solution and the conductive polymer solution. Impregnating) to perform a dip coating process to form a coating layer on the surface.

Specifically, a dip coating operation is performed in which the substrate 10 in which the positive charge layer 10 is laminated on the surface is immersed in an aqueous CNT solution (in the example described above, an PSS-SWNT aqueous solution). . 3 shows that the substrate 100 having the positive charge layer 10 is impregnated in the PSS-SWNT aqueous solution, thereby exhibiting a negative charge (CNT according to the example described above). A schematic conceptual diagram showing a state in which the adsorbed and wrapped 20 is attached to the surface of the substrate is shown. When the substrate 100 charged with the positive charge is immersed in the CNT aqueous solution, the CNTs 20 having the negative charge strongly adhere to the surface of the substrate 100 due to electrical attraction, and thus have a very thin and constant thickness. A CNT layer is formed. It is preferable to perform the CNT aqueous solution impregnation operation of the substrate 100 for about 30 minutes, the amount of CNT adsorbed on the surface of the substrate 100 increases with the increase of the impregnation time and then remains constant from 30 minutes. Because it becomes.

After the coating of the CNT layer by the CNT aqueous solution impregnation operation of the substrate 100 is finished, it is desirable to remove impurities that may be adsorbed and residual CNTs which may not be completely adsorbed by washing with clean water. This allows for a more uniform and thinner coating. Subsequently, the substrate 100 is dried. Drying the substrate 100 in a chamber sealed with nitrogen is advantageous in preventing impurities from being adsorbed during the drying operation.

When the CNT aqueous solution impregnation operation of the substrate 100 is completed and the CNT layer is coated on the surface of the substrate 100, the surface of the substrate 100 may be negatively charged due to the CNT 20 having a negative charge. Will be visible. Subsequently, the conductive polymer layer transparent to the surface of the substrate 100 is impregnated by impregnating the substrate 100 having a negative charge on the surface with a conductive polymer solution having a positive charge (specifically, a PEDOT-PEG solution). Conducting the dip coating of the conductive polymer solution to form a. In this case, the time for impregnating the substrate 100 in the conductive polymer solution is preferably about 15 minutes.

After the conductive polymer solution dip coating operation of the substrate 100 is finished, the substrate 100 is cleaned and dried. When cleaning the substrate 100, it is preferable to use a propylene carbonate solution and clean water. The drying operation, like the previous process, is carried out in a chamber sealed with nitrogen, which is advantageous to prevent the adsorption of impurities during the drying operation.

Through this process, an additional transparent conductive polymer layer is formed on the surface of the substrate 100 on which the CNT layer is coated. Since the CNT layer and the conductive polymer layer laminated on the substrate 100 have a very high electrical conductivity of the material, In addition, an electrically conductive layer exhibiting excellent performance is formed, and the substrate 100 on which the CNT layer and the conductive polymer layer are stacked becomes a transparent conductive plate having excellent light transmittance and electrical conductivity.

In particular, as described above, since the CNTs are uniformly dispersed in forming the CNT layer, even if the CNT layer is formed on the substrate 100 to secure conductivity, the light transmittance of the substrate 100 is not significantly reduced, and thus a high light transmittance is obtained. The branches can make conductive plates.

4 is a schematic conceptual view showing a state in which a conductive polymer having a positive charge (specifically, PEDOT-PEG) 30 is adsorbed on the outer surface of the CNT layer of the substrate 100 formed by attaching the CNT 20. Is shown. After coating of the conductive polymer, the surface of the substrate 100 has a positive charge due to the conductive polymer 30 having a positive charge.

Therefore, when the substrate 100 on which the conductive polymer layer is formed is immersed in the CNT aqueous solution, the CNT layer may be further formed. If necessary, subsequent CNT layer formation by impregnation with CNT aqueous solution and conductive polymer layer formation by impregnation with conductive polymer solution are repeatedly performed, so that the electrically conductive layer having the required thickness is applied to the surface of the substrate 100. To form.

As described above, in the present invention, the CNT layer is not formed thick at once, but is formed by stacking in multiple layers, thereby forming an even and uniform coating layer on the surface of the substrate 100. In particular, the thickness of one layer of the CNT layer and the conductive polymer layer coated on the substrate 100 is about several nanometers (nm), and the thickness thereof is very thin and constant. Therefore, according to the present invention, by controlling the number of lamination of the CNT layer and the conductive polymer layer, the thickness of the entire transparent conductive plate, including the substrate, and the amount of the CNT and the conductive polymer contained can be very finely controlled. There is an advantage that the electrical and optical properties of the transparent conductive plate can be adjusted as desired by the user.

Furthermore, in the present invention, in stacking the CNT layer into a plurality of layers, the CNT layer is alternately formed with the conductive polymer layer, thereby making it possible to achieve a firm bonding between the CNT layers, thereby providing a firm and durable structure on the substrate 100. Branches have the advantage of being able to form electrically conductive layers.

100: substrate, 10 positive charge layer, 20 PSS-SWNT,
21: CNT (SWNT), 22: PSS, 30: PEDOT-PEG

Claims (7)

delete Cleaning the surface of the transparent substrate 100 to remove foreign substances;
Dipping the substrate 100 in the OH group attachment solution so that the OH group adheres to the surface of the substrate 100;
Forming a positive charge layer using aminopropyl dioxide silane (APTES) on the surface of the cleaned substrate 100;
Carbon nanotubes (CNT) and polysodium 4-styrene sulfonate (PSS) are mixed in water and subjected to high frequency to produce CNT aqueous solution in which CNTs and PSS mixed in water are evenly dispersed in water. Impregnating the substrate 100 having a charge layer into the CNT aqueous solution to form a CNT layer having a negative charge on the surface of the substrate 100; And
Impregnating the substrate 100 coated with the CNT layer in a conductive polymer solution made of a conductive polymer having a positive charge, thereby forming a transparent conductive polymer layer on the CNT layer of the substrate 100. Method for producing a transparent conductive plate, characterized in that it comprises a.

The method of claim 2,
The method for attaching the OH group is a method of manufacturing a transparent conductive plate, characterized in that the solution consisting of a mixture of H 2 SO 4 and H 2 O 2 of 30% mass concentration in a volume ratio of 3: 1.
The method according to claim 2 or 3,
CNT mixed in the CNT aqueous solution is a single-walled carbon nanotube (SWNT),
SWNT and PSS are mixed in the CNT aqueous solution in a ratio of 1: 1 by mass ratio.
The method according to claim 2 or 3,
The conductive polymer solution is produced by dissolving poly3,4-ethylenedioxythiophene-polyethylene glycol in propylene carbonate.
The method according to claim 2 or 3,
After stacking the positive charge layer, the CNT layer and the conductive polymer layer in sequence on the substrate 100,
Impregnating the substrate 100 with an aqueous CNT solution to form a CNT layer having a negative charge on the surface of the substrate 100, and impregnating the substrate 100 with a conductive polymer solution having a positive charge. Method for producing a transparent conductive plate material, characterized in that to repeat the step of forming a transparent conductive polymer layer on the CNT layer of the substrate (100).
delete
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KR101425283B1 (en) * 2012-11-30 2014-08-01 한국세라믹기술원 Preparing method of cnt-conductive polymer composite using microwave
CN103928637B (en) * 2013-01-14 2016-05-04 北京阿格蕾雅科技发展有限公司 The preparation method of carbon nano tube transparent combination electrode
CN105427917A (en) * 2016-01-06 2016-03-23 上海交通大学 Metal nano wire transparent conductive film and preparation method thereof
CN109980028B (en) * 2019-04-08 2020-07-14 西安工业大学 Method for preparing transparent conductive nanowire grid film by electrically inducing surface of three-dimensional microstructure

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KR100790216B1 (en) * 2006-10-17 2008-01-02 삼성전자주식회사 A transparent cnt electrode using conductive dispersant and preparation method thereof
KR20100033097A (en) * 2008-09-19 2010-03-29 한국전자통신연구원 Transparent conductive thin film using carbon nano tube and method for preparation thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100790216B1 (en) * 2006-10-17 2008-01-02 삼성전자주식회사 A transparent cnt electrode using conductive dispersant and preparation method thereof
KR20100033097A (en) * 2008-09-19 2010-03-29 한국전자통신연구원 Transparent conductive thin film using carbon nano tube and method for preparation thereof

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