KR101091869B1 - Carbon nanotube conductive layer and the method for manufacturing the same - Google Patents

Abstract

The present invention provides a carbon nanotube conductive film and a method of manufacturing the same. A carbon nanotube conductive film according to a preferred embodiment of the present invention includes a substrate, a carbon nanotube electrode layer, a protective layer, and a low refractive layer. The carbon nanotube electrode layer is formed on one side of the substrate. The protective layer is formed on the carbon nanotube electrode layer and comprises a ceramic binder. The low refractive layer is formed on one side of the substrate, and comprises a low refractive binder. According to the present invention, it is possible to produce a carbon nanotube conductive film having improved durability without deteriorating the conductivity and light transmittance of the conductive film.

Carbon nanotube conductive film, ceramic binder, dip coating

Description

Carbon nanotube conductive layer and its manufacturing method {Carbon nanotube conductive layer and the method for manufacturing the same}

The present invention relates to a carbon nanotube conductive film and a manufacturing method thereof, and can be applied to various display fields, antistatic products, touch panel fields, and various fields including a transparent heating element.

In general, transparent conductive films have high conductivity (for example, sheet resistance of ¹ × 10 ³ Ω / sq or less) and high transmittance (80% or more) in the visible region. Accordingly, the transparent conductive film may include a plasma display panel (PDP), a liquid crystal display (LCD) device, a light emitting diode (LED), an organic light emitting diode (OLED), and an organic light emitting diode (OLED). ), As an electrode of various light-receiving elements and light-emitting elements in touch panels or solar cells, as well as transparent electromagnetic wave shielding agents such as antistatic films and electromagnetic wave shielding films used in automobile window glass or building window glass, and transparent heating elements such as heat ray reflecting films and refrigerated showcases. It is used.

Recently, research has been made on using carbon nanotubes as electrodes coated on a substrate.

The carbon nanotube is evaluated as an ideal material that can realize conductivity while maintaining optical properties with a theoretical percolation concentration of only 0.04%, and when a thin film is coated on a specific substrate in nanometer units, light is emitted in the visible region. Transmitted to show transparency, and maintains the electrical properties that are inherent characteristics of carbon nanotubes can be used as a transparent electrode.

The conductive film using carbon nanotubes as an electrode is formed by coating a carbon nanotube dispersion on a substrate. As the coating method, a filtering transition method, a spray coating method, and a coating method using a binder mixture are most commonly used. Among them, spray coating method is applicable to large area. Since it has the advantage that the mixing of the binder and CNT is unnecessary, it is used more and more.

However, the spray coating method has a disadvantage in scratches and environmental durability in the manufacturing process because the carbon nanotubes are exposed to the outside.

In addition, carbon nanotube electrodes have a disadvantage that the transmittance of the transparent electrode after coating is lower than that of ITO, which is a conventional transparent electrode material.

An important characteristic of the transparent electrode of the display is the transmittance and sheet resistance. The transmittance of the transparent electrode determines the transmittance of the panel, which is the final product, and is an important feature that is directly related to the clarity of the screen that the consumer feels when driving. Since the sheet resistance of the transparent electrode affects the driving voltage of the panel in which the transparent electrode is used and the operation characteristics of the product, a transparent electrode in which the original surface resistance value is maintained in various environments is required. That is, it is very important to secure electrode durability so that the change in the sheet resistance value of the transparent electrode with respect to the use environment can be minimized.

Accordingly, an object of the present invention is to provide a carbon nanotube conductive film having excellent permeability, high temperature and high humidity stability, durability against chemical resistance, and having excellent conductivity and transmittance.

Therefore, the carbon nanotube conductive film according to the preferred embodiment of the present invention includes a substrate, a carbon nanotube electrode layer, a protective layer, and a low refractive layer.

The carbon nanotube electrode layer is formed on one side of the substrate. The protective layer is formed on the carbon nanotube electrode layer and comprises a ceramic binder. The low refractive layer is formed on the other side of the substrate, and comprises a low refractive binder.

The protective layer may include carbon nanotubes.

A low refractive layer may be further formed on the protective layer.

In another aspect of the present invention, the carbon nanotube conductive film includes a substrate, a carbon nanotube electrode layer, and low refractive index.

The carbon nanotube electrode layer is formed on one side of the substrate.

The low refractive layer is formed on the other side of the substrate and the outer surface of the carbon nanotube electrode layer, and comprises a ceramic binder.

In this case, the carbon nanotube electrode layer is also interposed between the substrate and the low refractive layer formed on the other side of the substrate.

The ceramic constituting the protective layer and the low refractive index layer has a basic skeleton structure selected from tin oxide, yttrium oxide, magnesium oxide, silicon oxide, zinc oxide, and silicon, and the concentration of the protective layer and the low refractive layer is Solids may be 20 wt% or less. In this case, the protective layer may have one or more alkyl groups as side chains.

The thickness of the protective layer and the low refractive layer may be 10-500nm.

The protective layer thickness / carbon nanotube electrode layer thickness ratio is preferably 2 or less.

On the other hand, the carbon nanotube conductive film production method in another aspect of the present invention, the step of preparing a substrate, the carbon nanotube coating on one side of the substrate to form a carbon nanotube electrode layer, the carbon nanotube And simultaneously forming a low refractive layer made of a ceramic material on an outer surface of the electrode layer and the other side of the substrate.

The forming of the low refractive layer may be performed by dip coating a substrate on which the carbon nanotube electrode layer is formed into a low refractive layer solution. In this case, the step of forming the low refractive index layer, the carbon nanotube electrode layer is in a state in which the ceramic is diluted to 10wt% or less relative to the weight of the coating liquid in a coating liquid having water, alcohol and a solvent of a general organic solvent system It can be done by dipcoating the formed substrate. In addition, the speed of the dip coating may be 1 to 50cm / min.

Prior to forming the low refractive layer, the method may further include forming a protective layer coated with a ceramic having an alkyl group as a side chain on the carbon nanotube electrode layer.

The low refractive layer may have a thickness of about 10 nm to about 500 nm.

Meanwhile, the forming of the carbon nanotube electrode layer may include forming the carbon nanotube electrode layer on the other surface of the substrate.

According to the present invention, by coating the ceramic binder on both sides of the carbon nanotube film, a carbon nanotube conductive film having high permeability, high conductivity, high temperature, high humidity, and high durability against chemical stability can be obtained.

In addition, by simultaneously coating the protective layer and the low refractive layer, the durability and permeability of the carbon nanotube conductive film is improved.

Hereinafter, a carbon nanotube conductive film and a method for manufacturing the same according to a preferred embodiment of the present invention will be described in detail.

1 is a cross-sectional view illustrating a carbon nanotube conductive film 1 according to a preferred embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of part A of FIG. 1.

As shown in FIG. 1 and FIG. 2, the carbon nanotube conductive film 1 includes a substrate 10, a carbon nanotube electrode layer 20, a protective layer 30, and a low refractive index layer 40. .

Substrate 10 may be a transparent material and thus may be made of a transparent polymer such as glass, PET, PC. In this case, the substrate 10 is preferably made of a highly transparent inorganic substrate or a transparent polymer substrate to have flexibility.

The carbon nanotube electrode layer 20 is formed on at least one side of the substrate 10. The carbon nanotube electrode layer 20 includes carbon nanotubes. Carbon Nanotubes (CNTs) form a tube where one carbon is combined with other carbon atoms in a hexagonal honeycomb pattern to form a tube. When the carbon nanotubes are formed in a thin conductive film on a plastic or glass substrate, they can be used as transparent electrodes because they exhibit high transmittance and conductivity in the visible light region.

The protective layer 30 is formed on one side of the carbon nanotube electrode layer 20 and includes a ceramic binder 31. The protective layer 30 functions to protect the carbon nanotube electrode layer 20 from the outside. In this case, the transparency and electrical conductivity of the conductive film should not be reduced.

The protective layer 30 may be made of a binder material of ceramic material. In general, the ceramic binder 31 is capable of producing a coating film having a high light transmittance, and has excellent adhesive strength, which is advantageous for reinforcing microcracking, having excellent heat and fire resistance, and coating application.

The protective layer 30 made of the ceramic polymer has excellent oxidation stability, excellent weather resistance, low surface tension, stain resistance, and excellent permeability.

In addition, organic groups of ceramics are easily mixed with carbon nanotubes and maintain stability. Accordingly, the protective layer 30 has contact stability with the surface of the carbon nanotube electrode layer 20.

The ceramic binder 31 may be tin oxide (SnO 2) of a conductive material, yttrium oxide (Y 2 O 3) having strong water repellency, magnesium oxide (MgO) used as an electronic filter, silicon oxide (SiO 2) used as an adhesive, Zinc oxide (ZnO), silicon etc. which are sunscreens can be selected. In this case, the concentration of the low refractive index layer 40 is preferably 20 wt% or less of solid content.

As one example of the ceramic binder 31, the silicone binder exhibits various physical properties according to functional groups substituted with silicon elements. These functional groups may be converted to other functional groups by various chemical reactions, and in addition to the methyl group, organic groups such as phenyl group, vinyl group, propyl trifluoride group, alkyl group, etc. are substituted and are widely used commercially.

In the silicone binder, organic groups bonded to the inorganic main chain are simultaneously present in one material. For example, most silicon molecules have a structure having a main chain in the form of polysiloxane [-Si (RR ')-O-] n. Silicone polymer has a low surface tension and shows strong hydrophobicity, and because of this property, it can be easily used as a water repellent material without any modification process.

The low refractive index layer 40 is formed on the other side of the substrate 10 and includes a low refractive binder. The low refractive index layer 40 improves the transparency of the entire carbon nanotube conductive film by reducing the refraction of light passing therethrough.

It is preferable that the thickness of the low refractive index layer 40 is 10-500 nm, since the thickness of the low refractive index binder is the most excellent when the film is coated on the substrate 10 with a predetermined thickness or more.

In addition, the protective layer 30 also preferably has a thickness of several to several hundred nanometers, which is to maintain the conductivity of the carbon nanotube electrode layer 20. In general, in order to solve the problem that the binder material does not have high conductivity and the silicon binder does not have the sheet resistance of 1 kΩ / sq or less required by the transparent electrode, a thin ceramic coating film of nano units is formed on one side of the carbon nanotubes and The carbon nanotube electrode layer 20 is to prevent the electrode properties as much as possible. Preferably, the protective layer thickness / carbon nanotube electrode layer thickness ratio should be adjusted in a range of 2 or less.

Although not shown in the drawing, the carbon nanotube electrode layer 20 may be formed on the other surface of the substrate. That is, the carbon nanotube electrode layer may be formed on both sides of the substrate, in this case, the low refractive layer 40 may be formed to cover the outer surface of the carbon nanotube electrode layer formed on the other surface of the substrate.

3 is a diagram illustrating a modification of FIG. 2. As shown in FIG. 3, in order to maintain the conductivity of the carbon nanotube electrode layer 20, the protective layer 30 may further include a carbon nanotube 33. That is, by forming a coating solution in which the ceramic binder 31, the carbon nanotubes 33, and the polar solvent are mixed at a predetermined ratio, and coating the carbon nanotube electrode layer 20, the sheet resistance due to the coating of the protective layer 30 is increased. It can overcome the shortcomings and maintain the electrode characteristics of carbon nanotubes.

4 is a view showing a carbon nanotube conductive film 2 according to a preferred embodiment of the present invention. As shown in FIG. 4, the carbon nanotube conductive film 2 includes a substrate 10, a carbon nanotube electrode layer 20, and a low refractive index layer 40. In this case, the low refractive layer 40 is formed on the other side of the substrate 10 and the outer surface of the carbon nanotube electrode layer 20, and comprises a ceramic binder.

The low refractive index layer 40 may be made of a binder material of a ceramic material. In general, the ceramic binder is capable of producing a coating film having a high light transmittance, and has excellent adhesive strength, which is advantageous for reinforcing microcracking, having excellent heat and fire resistance, and coating application.

The low refractive index layer 40 made of the ceramic polymer has excellent oxidation stability, excellent weather resistance, low surface tension, stain resistance, and excellent permeability.

In addition, organic groups of ceramics are easily mixed with carbon nanotubes and maintain stability. Accordingly, the low refractive index layer 40 has contact stability with the surface of the carbon nanotube electrode layer 20.

The ceramic binder may be tin oxide (SnO 2) of a conductive material, yttrium oxide (Y 2 O 3) having strong water repellency, magnesium oxide (MgO) used as an electronic filter, silicon oxide (SiO 2) used as an adhesive, and a sunscreen agent. Zinc oxide (ZnO), silicon and the like can be selected. In this case, the concentration of the protective layer 30 and the low refractive index layer 40 is preferably 20 wt% or less of solid content.

As one example of the ceramic binder, a silicone binder exhibits various physical properties according to a functional group substituted with a silicon element. These functional groups may be converted to other functional groups by various chemical reactions, and in addition to the methyl group, organic groups such as phenyl group, vinyl group, propyl trifluoride group, alkyl group, etc. are substituted and are widely used commercially.

The silicon binder is present in the material at the same time the organic group bonded to the inorganic backbone. For example, most silicon molecules have a structure having a main chain in the form of polysiloxane [-Si (RR ')-O-] n. Silicone polymer has a low surface tension and shows strong hydrophobicity, and because of this property, it can be easily used as a water repellent material without any modification process.

It is preferable that the thickness of the low refractive index layer 40 is 10-500 nm, the thickness of the low refractive index binder when the coating on the substrate 10 with a predetermined thickness or more, the best transmittance of the film, the carbon nanotube electrode layer This is to maintain the conductivity of (20). In general, in order to solve the problem that the binder material does not have high conductivity and the silicon binder does not have the sheet resistance of 1 kΩ / sq or less required by the transparent electrode, a thin ceramic coating film of nano units is formed on one side of the carbon nanotubes and The carbon nanotube electrode layer 20 is to prevent the electrode properties as much as possible. Preferably, the low refractive index layer thickness / carbon nanotube electrode layer thickness ratio should be adjusted in the range of 2 or less.

In addition, the low refractive index layer 40 may simultaneously form both surfaces of the substrate 10 on which the carbon nanotube conductive layer 20 is formed. For example, the low refractive index layer 40 may be coated on both surfaces of the substrate 10 on which the carbon nanotube electrode layer 20 is formed by a dip coating method. Accordingly, the simultaneous effect of improving the transmittance of the transparent electrode and the durability of the electrode can be obtained.

In general, carbon nanotubes are directly affected by the properties of the coating substrate 10, and thus exhibit the characteristics of the electrode, so that thermal durability is greatly improved when both surfaces of the coating substrate 10 are protected by the same ceramic layer. When the low refractive index layer 40 is placed only on the surface on which the carbon nanotube electrode layer 20 is coated, the other surface portion of the lower substrate 10 that is not protected may be deformed due to the influence on heat. However, according to the present invention, since one side and the other side of the substrate 10 on which the carbon nanotube electrode layer 20 is formed are protected, the change of the substrate 10 to shrinkage expansion is reduced.

5 is a block diagram showing each step of the carbon nanotube conductive film manufacturing method according to a preferred embodiment of the present invention. As shown in FIG. 5, the carbon nanotube conductive film manufacturing method includes preparing a substrate (S10), and coating a carbon nanotube on one side of the substrate to form a carbon nanotube electrode layer (S20); And simultaneously forming a low refractive layer made of a ceramic material on the outer surface of the carbon nanotube electrode layer and the other side of the substrate (S40).

The above step will be described in detail with reference to FIG. 4 along with FIG. 5. In order to manufacture the carbon nanotube conductive film, the step of preparing the substrate 10 is first performed (S10). The substrate 10 may be glass as described above or a flexible polymer polymer.

Thereafter, the carbon nanotubes are coated on the substrate 10 to form the carbon nanotube electrode layer 20 (S20). In this case, the carbon nanotubes may be single-walled carbon nanotubes or multi-walled carbon nanotubes.

The coating method of the carbon nanotube electrode layer 20 may be a spray coating, a filtering transition method of the dispersion, a coating method using a binder mixture, and the like.

Thereafter, a step (S40) of forming a low refractive index layer 40 made of a ceramic material on both sides of the substrate 10.

By forming a low refractive index layer 40 made of a ceramic material on each side of the carbon nanotube conductive layer and on both sides of the substrate 10, the oxidation stability and weather resistance of the carbon nanotube conductive film are improved, and the surface tension is reduced and the stain resistance is achieved. It can be made to have excellent permeability.

In this case, the forming of the carbon nanotube electrode layer 20 (S20) includes forming the carbon nanotube electrode layer 20 on the other surface of the substrate, and forming the low refractive layer 40. In the step of forming, the low refractive index layer 40 may be formed on the outer surface of the carbon nanotube electrode layer formed on both surfaces of the substrate 10.

The low refractive index layer 40 may be formed by double-coating a silicon binder having the alkyl group as a side chain through dip coating on the substrate 10 on which the carbon nanotube electrode layer 20 is formed.

The solvent that can be used for the dip coating may be selected from alcohols, amines, distilled water and a general organic solvent, the silicone binder may have a polyethylene oxide group for water solubility at the end for dispersion in the solvent.

The solvent has a boiling point of 120 ° C. or less so that the low refractive index layer 40 is easily removed after coating the carbon nanotube electrode layer 20.

The low refractive index layer 40 made of the silicone polymer has excellent oxidation stability, excellent weather resistance, low surface tension, stain resistance, and excellent permeability.

When the dip coating step is described in more detail, first, a supporting solution to be used for dip coating is prepared. In this case, the dilution of the binder for the solution preparation is diluted to 10wt% or less relative to the solution.

delete

The diluted coating solution is filled into a container for dip coating.

Thereafter, the ceramic material is coated on both surfaces of the substrate 10 on which the carbon nanotube electrode layer 20 is formed using a dip coater.

The speed of dip coating is controlled in the range of 1 to 50 cm / min. In general, in the deep coating, the thickness of the thin film is inversely proportional to the coating speed. In other words, the higher the supporting speed, the thicker the coating layer, and the lower the supporting speed, the thinner the coating layer. If the speed of the dip coating is more than 50cm / min thickness of the coating layer is a problem that the electrical conductivity and light transmittance is reduced, and when the 1cm / min or less, the coating productivity and the thickness of the thin film appears to have a problem that the durability is poor.

In this case, the thickness of the coating is adjusted to maintain the stability and conductivity of the surface of the carbon nanotube electrode layer 20 after coating. Preferably, the coating is preferably performed in a range in which the sheet resistance does not change to 50% or less of the initial sheet resistance of carbon nanotubes. The thickness of the coating is preferably 10 ~ 500nm, if the thickness of the coating is more than 500nm light transmittance is lowered, if it is less than 10nm the durability characteristics are lowered.

The solvent that can be used for the dip coating may be selected alcohols, amines, distilled water and a general organic solvent, the silicone binder may have a polyethylene oxide group for water solubility at the end for dispersion in the solvent.

The solvent has a boiling point of 120 ° C. or less so that the low refractive index layer 40 is easily removed after coating the carbon nanotube electrode layer 20.

In general, the carbon nanotube electrode layer 20 is subjected to a stabilization process through heat treatment after coating the carbon nanotubes on the substrate 10 for adhesion stabilization. This stabilization method is characterized by the nature of the thermoplastic on the surface of the substrate 10. The adhesive layer can be wrapped around the bottom of the carbon nanotubes. However, during the heat treatment process, the change of the substrate 10 occurs a lot, which causes a disadvantage that the sheet resistance of the carbon nanotube electrode increases much compared to immediately after coating. As a result, the characteristics of the transparent electrode which must maintain the properties for conductivity are greatly reduced. However, after coating the carbon nanotubes on the substrate 10 proposed in the present invention and forming a silicon low refractive index layer 40 on both sides of the upper and lower surfaces by dip coating and stabilizing the heat treatment, the surface resistance increase in the previous two cases occurs. This can be suppressed to produce a film having a relatively low sheet resistance.

This is because the low refractive index layer 40 coated on both sides through the dip coating minimizes the shape change of the substrate 10 so that the sheet resistance value of the transparent electrode does not increase significantly and maintains the sheet resistance value immediately after the coating. Therefore, the formation of the double-sided low refractive index layer 40 through dip coating enables the production of a highly transparent and highly conductive transparent electrode by maintaining the sheet resistance while increasing the transmittance.

In addition, if the type of the combined reactor of the ceramic is properly set, the flexibility of the carbon nanotube conductive film can be maintained. For example, by selecting at least one alkyl group, which is a kind of reactor bonded to silicon, as a side chain, the coating property of the ceramic binder 31 may be maintained in the flexible coating surface. In this case, the number of carbon atoms of the branched alkyl group is preferably between 5 and 15.

Meanwhile, before forming the low refractive index layer 40 (S40), as shown in FIG. 1, the protective layer 30 is coated with a ceramic having an alkyl group as a side chain on the carbon nanotube electrode layer 20. Forming may be performed (S30).

The protective layer 30 made of the ceramic polymer has excellent oxidation stability, excellent weather resistance, low surface tension, stain resistance, and excellent permeability.

In this case, the protective layer 30 preferably has a thickness of several to several hundred nanometers, in order to maintain the conductivity of the carbon nanotube electrode layer 20. In general, in order to solve the problem that the binder material does not have high conductivity and the silicon binder does not have the sheet resistance of 1 kΩ / sq or less required by the transparent electrode, a nano-layer thin ceramic coating film is formed on the carbon nanotubes. The electrode characteristics of the carbon nanotube electrode layer 20 are not deteriorated as much as possible. Preferably, the thickness of the protective layer 30 / carbon nanotube electrode layer 20 should be adjusted in a range of 2 or less.

After coating the low refractive layer 40, the step of curing the low refractive layer 40 may be further roughened. In addition, after coating the protective layer 30, the protective layer 30 may be hardened. To this end, the pretreatment temperature before curing has a preheating time of about 1 hour at 40 to 60 ° C., and then may be cured for 60 minutes at 100 ° C. to 150 ° C., more preferably 125 ° C. to 135 ° C., for complete curing. The heat treatment temperature and heat treatment time may be adjusted according to the type of substrate and the properties of the binder.

<Examples>

In the embodiment, the protective layer 30 and the low refractive layer 40 made of a silicon binder are coated on one surface of the carbon nanotube electrode layer 20 and the other surface of the substrate 10, respectively.

In the comparative example, the carbon nanotube electrode layer 20 was coated on the substrate 10, and a separate double-sided low refractive layer 40 was not coated.

 In order to evaluate the properties of the prepared transparent electrode, the transmittance and sheet resistance after coating were measured. In addition, high temperature and high humidity tests were conducted to confirm durability characteristics. In this case, the experimental conditions were a constant temperature and humidity chamber at 65 ℃, 95%, 240 hours.

Experiment Permeability Before heat treatment
Sheet resistance (Ω / □) After heat treatment
Sheet resistance (Ω / □) High temperature and high humidity durability
R / Ro (surface resistance / initial surface resistance after high temperature and high humidity) Example 89 600 700 <1.1 Comparative example 84 600 900 > 1.6

In the case of Example, the transmittance was 89% and the sheet resistance before heat treatment was 600 Ω / □, and the sheet resistance (Ro) 700 Ω / □ after heat treatment, which was 65 ℃, 95%, and the rate of change of surface resistance (R) after 240 hours high temperature and high humidity test. It was found that / Ro <1.1.

In the comparative example, the sheet resistance value Ro increases to 900 Ω / □ after heat treatment stabilization with an initial sheet resistance of 600? It was found that the sheet resistance (R) change rate R / Ro => 1.6 was unstable after the high temperature and high humidity test. In other words, the change rate (R / Ro) of 1.2% or more, which is a required characteristic of a transparent electrode, may be found to be unstable at high temperature and high humidity.

1 is a cross-sectional view showing one end surface of a carbon nanotube conductive film according to a preferred embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of part A of FIG. 1.

3 is a cross-sectional view illustrating a modification of FIG. 2.

Figure 4 is a cross-sectional view showing one end surface of the carbon nanotube conductive film according to another embodiment of the present invention.

5 is a block diagram showing a method of manufacturing a carbon nanotube conductive film according to a preferred embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1, 2: carbon nanotube conductive film 10: substrate

20: carbon nanotube electrode layer 30: protective layer

31: ceramic binder 40: low refractive layer

Claims (17)

temperament; A carbon nanotube electrode layer formed on one side of the substrate; A protective layer formed on the carbon nanotube electrode layer and including a ceramic binder; And A low refractive layer formed on the other side of the substrate and including a low refractive binder; Carbon nanotube conductive film having a. The method of claim 1, The protective layer is a carbon nanotube conductive film containing carbon nanotubes. The method of claim 1, A carbon nanotube conductive film further formed with a low refractive index layer on the protective layer. The method of claim 1, A carbon nanotube conductive film having a protective layer thickness / carbon nanotube electrode layer thickness ratio of 2 or less. temperament; A carbon nanotube electrode layer formed on one side of the substrate; And A low refractive layer formed on the other side of the substrate and the outer surface of the carbon nanotube electrode layer and including a ceramic binder; Carbon nanotube conductive film having a. The method of claim 5, The carbon nanotube electrode layer is interposed between the substrate and a low refractive index layer formed on the other side of the substrate. delete delete The method according to any one of claims 1 to 6, The material forming the low refractive index layer has one selected from tin oxide, yttrium oxide, magnesium oxide, silicon oxide, zinc oxide, and silicon as a basic skeleton structure, and the concentration of the low refractive layer is 20 wt% or less of carbon nanoparticles. Tube conductive film. The method according to any one of claims 1 to 6, The thickness of the low refractive layer is 10-500nm carbon nanotube conductive film. Preparing a substrate; Coating carbon nanotubes on one side of the substrate to form a carbon nanotube electrode layer; And Simultaneously forming a low refractive layer made of a ceramic material on an outer surface of the carbon nanotube electrode layer and the other side of the substrate; Carbon nanotube conductive film production method comprising a. The method of claim 11, The forming of the low refractive index layer is a method of manufacturing a carbon nanotube conductive film formed by dip coating a substrate on which the carbon nanotube electrode layer is formed on a low refractive layer solution. The method of claim 12, The forming of the low refractive layer may include forming a substrate on which the carbon nanotube electrode layer is formed in a state in which the ceramic is diluted 10 wt% or less with respect to the weight of the coating liquid in a coating liquid having water, an alcohol, and a solvent of a general organic solvent system. A method for producing a carbon nanotube conductive film formed by dip coating. The method of claim 12, The dip coating speed is 1 to 50cm / min method for producing a carbon nanotube conductive film. The method according to any one of claims 11 to 14, The method of manufacturing a carbon nanotube conductive film further includes forming a protective layer coated with a ceramic having an alkyl group as a side chain on the carbon nanotube electrode layer before forming the low refractive layer. The method according to any one of claims 11 to 14, The low refractive index layer is a carbon nanotube conductive film manufacturing method of 10 to 500nm thickness. The method according to any one of claims 11 to 14, The forming of the carbon nanotube electrode layer may include forming the carbon nanotube electrode layer on the other surface of the substrate.

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