KR20230004168A - Method for producing conductive fiber, and fiber manufactured by using the same - Google Patents

Abstract

An embodiment of the present invention provides: a method for manufacturing conductive fibers which comprises a step of manufacturing a coating solution containing a carbon-conductive polymer composite in which carbon quantum dots are dispersed in a conductive polymer, and a step of forming a conductive coating layer on the fiber by immersing the fiber in the coating solution, and thus has improved electrical properties and thermal stability by adding thermal stability by carbon quantum dots; and conductive fibers manufactured according to the same.

Description

Method for producing conductive fiber and conductive fiber manufactured according to the method

The present invention relates to a conductive fiber, and more particularly, to a method for preparing a conductive fiber having improved electrical properties and thermal stability by coating the fiber with a coating solution in which carbon quantum dots are dispersed in a conductive polymer.

[R&D project supporting this invention]

[Assignment number] JA-21-0001

[Name of department] Government contribution

[Research management institution] Korea Institute of Industrial Technology

[Research project name] Corporate demand-based production technology commercialization project (5/5)

[Research Project Title] [Integrated EZ] Development of high-performance source material technology for smart textronics

[Contribution rate] 30%

[Host Research Institute] Korea Institute of Industrial Technology

Conductive fibers act as an important element of wearable devices and functional fibers, and are used in various fields, such as being used as sensors. Therefore, attempts are being made to apply various materials.

Prior to this, looking at each material, metal-based materials have the advantage of excellent conductivity, but there is a fatal disadvantage that the resistance value changes greatly as the temperature changes, and there is a possibility of oxidation if it is present in the air for a long time, which shortens the lifespan. The downside is that it is not long. In addition, due to the nature of the functional fiber that must be in direct contact with the skin, the stability problem caused by the direct contact of the metal with the skin has not been solved.

Next, nano-carbon-based materials are highly stable and low-toxic enough to come into contact with the skin, making them highly likely to be suitable for functional textiles. However, there is a disadvantage that uniform introduction is difficult due to insufficient adsorption power with fibers, and thus it is not suitable for application to conductive fibers.

In addition, materials being tried are conductive polymers such as polyacetylene, polypyrrole, polythiophene, and poly(3,4-ethylenedioxythiophene) (PEDOT). Conductive polymers have excellent electrical conductivity, stability and less toxicity than metal-based materials, and excellent adsorption to fibers, so that uniform conductive fibers can be produced. However, conductive polymers have a fatal disadvantage in that resistance values change rapidly with temperature changes. As such, if the resistance value of the conductive fiber changes with temperature, it is impossible to use it in various environments, so the conductive polymer also has a distinct limitation as a material for the conductive fiber. Therefore, it is required to develop conductive fibers that can be applied to various devices with excellent electrical properties and thermal stability as essential conditions.

(Patent) Republic of Korea Patent Publication No. 10-2016-0033856

The technical problem to be achieved by the present invention is to provide a method for preparing a conductive fiber having improved electrical properties and thermal stability by preparing a coating solution and immersing the fiber in the coating solution.

Another embodiment of the present invention is to provide a conductive fiber with improved electrical properties and thermal stability manufactured by the above manufacturing method.

The technical problem to be achieved by the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

In order to achieve the above technical problem, one embodiment of the present invention provides a method for manufacturing a conductive fiber.

In an embodiment of the present invention, a method for manufacturing a conductive fiber includes preparing a coating solution including a carbon-conductive polymer composite in which carbon quantum dots are dispersed in a conductive polymer; and forming a conductive coating layer on the fiber by immersing the fiber in the coating solution, and adding thermal stability to the carbon quantum dots to provide a conductive fiber manufacturing method having improved electrical properties and thermal stability.

In this case, the carbon quantum dots dispersed in the conductive polymer may reduce the interface resistance of the carbon-conductive polymer composite by modifying the morphology of the conductive polymer.

Also, at this time, the conductive polymer may include poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS).

In addition, at this time, the carbon quantum dots may be characterized in that the size is 2nm to 4nm.

In addition, at this time, the carbon quantum dots may be characterized in that the metal is introduced carbon quantum dots.

In addition, at this time, the metal may be characterized in that it includes a transition metal.

In addition, at this time, the transition metal may be characterized in that it includes nickel or silver.

In addition, at this time, the carbon quantum dots into which the metal is introduced may include (a) preparing a metal precursor solution by mixing the metal precursor with distilled water; Thereafter, (b) mixing and stirring the solution of step (a) and the carbon precursor; Thereafter, (c) step of hydrothermal synthesis of the solution of step (b); (d) step of cooling the solution of step (c) thereafter; Thereafter, (e) step of filtering the solution of step (d) with a filter and then washing; And then, it may be characterized in that it is prepared in step (f) of drying the solution of step (e).

In addition, at this time, the carbon precursor in step (b) may be characterized in that it includes Fumaronitrile (C ₄ H ₂ N ₂ ).

In addition, at this time, the step of forming a conductive coating layer on the fiber may include (g) converting the surface to a hydrophilic property by treating the surface of the fiber with oxygen plasma as a pretreatment; And it may be characterized in that it further comprises the step (h) of adding and mixing an additive for improving the coating ability to the coating solution.

In addition, at this time, the additive in step (h) may be a conductive fiber manufacturing method characterized in that it includes dimethyl sulfoxide (DMSO) and 4-dodecylbenzenesulfonic acid.

In order to achieve the above technical problem, another embodiment of the present invention provides a conductive fiber.

In an embodiment of the present invention, the conductive fiber is a fiber; and a conductive coating layer disposed on the fiber and including a carbon-conductive polymer composite in which carbon quantum dots are dispersed in the conductive polymer, so that the conductive fiber has improved electrical properties and thermal stability.

In this case, the carbon quantum dots dispersed in the conductive polymer may reduce the interface resistance of the carbon-conductive polymer composite by modifying the morphology of the conductive polymer.

In addition, the conductive polymer may include poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS).

In addition, at this time, the carbon quantum dots may be characterized in that the size is 2nm to 4nm.

In addition, at this time, the carbon quantum dots may be characterized in that the metal is introduced carbon quantum dots.

In addition, at this time, the metal may be characterized in that it includes a transition metal.

In addition, at this time, the transition metal may be a conductive fiber characterized in that it includes nickel or silver.

According to an embodiment of the present invention, preparing a coating solution including a carbon-conductive polymer composite in which carbon quantum dots are dispersed in a conductive polymer and immersing fibers in the coating solution to form a conductive coating layer on the fibers It is possible to provide a conductive fiber manufacturing method with improved electrical properties and thermal stability, including the step of providing a conductive fiber according to the manufacturing method.

Accordingly, it is possible to manufacture a universally usable conductive fiber that overcomes the change in resistance value according to temperature and shows consistent electrical characteristics at various temperatures by supplementing the disadvantages of metal-based materials and conductive polymer-based materials and combining the advantages. .

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a schematic diagram of a carbon-conductive polymer composite and a conductive fiber coated with the composite.
2 is a schematic diagram of a method for manufacturing a conductive fiber according to an embodiment of the present invention.
3 is (a) a transmission electron micrograph, (b) a size distribution graph, and (c) a transmission electron micrograph showing the lattice size of carbon quantum dots of a conductive fiber, which is an embodiment of the present invention.
4 shows (a) Fourier transform infrared spectroscopy data of carbon quantum dots, (b) UV-visible spectroscopy data for each concentration of carbon quantum dots, (c) excitation of carbon quantum dots for carbon quantum dots of an embodiment of the present invention. These are photoluminescence data for each wavelength, (d) photoexcitation data for each emission wavelength of carbon quantum dots, and (ef) X-ray photoelectron spectroscopy data for carbon quantum dots.
5 is (a) X-ray photoelectron spectroscopy data, (b) ultraviolet-visible photoelectron spectroscopy data, (cd) atomic force microscope data for a conductive polymer and a carbon-conductive polymer composite of a conductive fiber, which is an embodiment of the present invention. to be.
6 is resistance change data according to temperature of the conductive fiber including the carbon-conductive polymer composite in the conductive fiber according to an embodiment of the present invention.
7 is resistance change data according to temperature of a conductive fiber including a carbon-conductive polymer composite in which Ag is introduced as a metal in the conductive fiber according to an embodiment of the present invention.
8 is resistance change data according to temperature of a conductive fiber including a carbon-conductive polymer composite in which Ni is introduced as a metal in the conductive fiber, which is an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and, therefore, is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this is not only "directly connected", but also "indirectly connected" with another member in between. "Including cases where In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, FIG. 1 (a) is a schematic diagram of a carbon-conductive polymer composite 300 of a conductive fiber 400, which is an embodiment of the present invention, and FIG. 1 (b) is an embodiment of the present invention. It is a schematic diagram of the conductive fiber 400 as an example. 2 is a schematic diagram of a method for manufacturing a conductive fiber 400 according to an embodiment of the present invention.

Referring to FIG. 1, looking at the manufacturing method of the conductive fiber 400, which is an embodiment of the present invention, the manufacturing method of the conductive fiber 400 is a carbon-conductive polymer composite in which carbon quantum dots 100 are dispersed in a conductive polymer 200. Preparing a coating solution containing (300); And immersing the fiber in the coating solution to form a conductive coating layer on the fiber, wherein the carbon quantum dots 100 add thermal stability to the conductive fiber 400 having improved electrical properties and thermal stability. characterized by

At this time, the carbon quantum dots 100 dispersed in the conductive polymer 200 change the morphology of the conductive polymer 200 to reduce the interface resistance of the carbon-conductive polymer composite 300.

Specifically, the currently commonly used conductive polymer 200 has the advantage of being well attached to electrical properties and fibers, but has a fatal disadvantage that its electrical properties change rapidly as the temperature changes, and the carbon quantum dot 100-based Although the material has great electrical properties and thermal stability. It has the disadvantage that it does not adhere well to fibers. Therefore, in order to compensate for the disadvantages and maximize the advantages through the present invention, the carbon quantum dots 100 are introduced in a form in which the carbon quantum dots 100 are evenly dispersed in the conductive polymer 200 based on the carbon quantum dots 100 to improve electrical conductivity and carbon quantum dots 100 ) is also intended to formulate a special structure that is utilized. Through this, the purpose is to secure competitiveness by improving electrical properties, stably securing electrical properties against temperature changes, improving thermal stability, and manufacturing a new conductive fiber 400 through morphology improvement.

Looking at each material, the conductive polymer 200 may be a conductive polymer 200 such as polyacetylene, polypyrrole, polythiophene, or poly(3,4-ethylenedioxythiophene) (PEDOT). . However, it is not limited thereto, and, like the materials mentioned above by those skilled in the art of the present invention, it has excellent electrical conductivity, less stability and toxicity than metal-based materials, and excellent adsorption with fibers, resulting in uniform conductivity. Materials that may be used to fabricate the fibers 400 should be construed as falling within the scope of the present invention. In the present invention, in particular, an embodiment including poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the material of the conductive polymer 200 was implemented. In the case of PEDOT:PSS, the carbon quantum dots 100 It is introduced and dispersed in the PEDOT:PSS, and the carbon quantum dot (100) aqueous solution serves as a polar solvent when introduced to reduce the specific gravity of PSS in PEDOT:PSS by replacing PSS, which is an electrical insulator. Accordingly, the reduction of PSS, which serves to aggregate PEDOT in PEDOT:PSS, reduces the aggregation of the carbon-conductive polymer composite 300, causes a morphological change in which the size of the particles increases, and as a result, the resistance generated at the interface decreases, and at the same time the electrical Due to the reduction of PSS, which is an insulator, and the increase of carbon quantum dots 100 having excellent electrical properties and thermal stability, a carbon-conductive polymer composite 300 having improved electrical conductivity while maintaining thermal stability is achieved.

Looking at the carbon quantum dot 100 as the next material, the carbon quantum dot 100, which is a type of nano-carbon, is a nanoscale carbon composite and has optical and surface electronic properties due to non-covalent bonding due to pi-pi stacking between carbon composites. In addition, since the 0-dimensional carbon quantum dots 100 manufactured according to the method for manufacturing the conductive fiber 400, which is an embodiment of the present invention, is composed of covalent bonds in the nanoscale carbon composite, it is thermally very stable and the carbon quantum dots 100 ) is nanoscale, so unlike other carbon-based materials, it has very abundant functional groups, and the functional groups serve as active edge sites, so it has excellent electrical properties.

Next, looking at the carbon-conductive polymer composite 300 including the conductive polymer 200 and the carbon quantum dots 100 and the coating solution including the same, the carbon quantum dots 100 and the conductive polymer 200 are formulated through Even in the case of the carbon-conductive polymer composite 300, material properties of the carbon quantum dots 100 and the conductive polymer 200 may be maintained. Therefore, it can be expected that the manufactured carbon-conductive polymer composite 300 has electrical properties and thermal stability due to the carbon quantum dots 100 and can be used at various temperatures by minimizing the change in resistance value according to the resulting temperature.

Next, referring to FIG. 3, in the manufacturing method of the conductive fiber 400 according to an embodiment of the present invention and the conductive fiber 400 prepared according to the method, the size of the carbon quantum dots 100 is preferably 2 nm to 4 nm. Do. Specifically, in the case of quantum dots, the optical properties vary greatly depending on the size, so a size of 2 nm to 4 nm is preferable for formulation with the conductive polymer for the purpose of the present invention. It is important that these variable quantum dots are controlled within a narrow size range as described above because a uniform size means uniform characteristics. According to FIG. 3 (a), it can be seen that the carbon quantum dots 100 are evenly dispersed in the conductive polymer 200, and according to FIGS. 3 (b) and (c), as described above, the carbon quantum dots ( 100) can be confirmed that most of them are manufactured to have a size of 2 nm to 3 nm.

Next, in the manufacturing method of the conductive fiber 400, which is an embodiment of the present invention, and the conductive fiber 400 manufactured according to the method, the carbon quantum dot 100 may be a carbon quantum dot 100 into which a metal is introduced, and the metal may be a transition material. May contain metal. Also, the transition metal may include nickel or silver. Specifically, in order to improve the electrical characteristics of the conductive fiber 400, various transition metals such as nickel or silver mentioned above are introduced into the carbon quantum dot 100, and in addition to improving electrical characteristics If you want to improve other characteristics In addition, it is possible to introduce non-metallic elements such as nitrogen and phosphorus. Therefore, materials that can be introduced into the carbon quantum dots 100 are not limited to the above-mentioned materials, and materials that can be used without difficulty by a person skilled in the art to improve the properties of the carbon-conductive polymer fall within the range. should be interpreted as inclusive.

Next, in terms of the manufacturing method, in the manufacturing method of the conductive fiber 400, which is an embodiment of the present invention, and the conductive fiber 400 manufactured according to the method, the carbon quantum dots 100 into which the metal is introduced are obtained by distilling the metal precursor into distilled water. (a) step of preparing a metal precursor solution by mixing with; Thereafter, (b) mixing and stirring the solution of step (a) and the carbon precursor; Thereafter, (c) step of hydrothermal synthesis of the solution of step (b); (d) step of cooling the solution of step (c) thereafter; Thereafter, (e) step of filtering the solution of step (d) with a filter and then washing; And then, it is characterized in that it is prepared in step (f) of drying the solution of step (e). Specific experimental conditions will be examined in the following experimental examples.

Next, in the method of manufacturing the conductive fiber 400, which is an embodiment of the present invention, the step of forming a conductive coating layer on the fiber is a step (g) of converting the surface to hydrophilicity by treating the surface of the fiber with oxygen plasma as a pretreatment ; and (h) adding and mixing an additive for improving coating ability to the coating solution. Similarly, specific experimental conditions will be examined in the following experimental examples.

Next, the conductive fiber 400 manufactured according to the manufacturing method of the conductive fiber 400, which is an embodiment of the present invention, will be described.

Referring to Figure 1 Salpin earlier, the conductive fiber 400 is a fiber; and a conductive coating layer disposed on the fiber and including a carbon-conductive polymer composite 300 in which carbon quantum dots 100 are dispersed in the conductive polymer 200, characterized in that electrical properties and thermal stability are improved.

At this time, the carbon quantum dots 100 dispersed in the conductive polymer 200 change the morphology of the conductive polymer 200 to reduce the interface resistance of the carbon-conductive polymer composite 300.

Also, at this time, the conductive polymer 200 may include poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS).

Also, at this time, the carbon quantum dots 100 may be carbon quantum dots 100 into which a metal is introduced, and the metal may include a transition metal. Also, the transition metal may include nickel or silver. However, it is not limited thereto, and materials that can be used without difficulty by those skilled in the art in order to improve the electrical properties of the carbon-conductive polymer composite 300 should be construed as being included in the scope.

Next, it is preferable that the size of the carbon quantum dots 100 is 2 nm to 4 nm, as seen in the manufacturing method of the conductive fiber 400 above. Specifically, in the case of quantum dots, the optical properties vary greatly depending on the size, so a size of 2 nm to 4 nm is preferable for formulation with the conductive polymer for the purpose of the present invention. It is important that these variable quantum dots are controlled within a narrow size range as described above because a uniform size means uniform characteristics.

Since descriptions of the carbon quantum dots 100, the conductive polymer 200, and the carbon-conductive polymer composite 300 are the same as in the manufacturing method of the conductive fiber 400, a repeated description will be omitted.

Next, looking at the possibility of using the conductive fiber 400, which is an embodiment of the present invention, the main purpose is to overcome the change in resistance value according to temperature by formulating the conductive polymer 200 in which the carbon quantum dots 100 are introduced, and at various temperatures. It is a fabrication of a universally usable conductive fiber 400 that shows consistent electrical characteristics, and based on this, it is expected to be applied to functional fibers and sensors or used in various fields such as wearable devices.

Example 1

Method for producing carbon quantum dots with transition metal

1. Step (a)

This step is to prepare a transition metal precursor solution by mixing the transition metal precursor with distilled water. In detail in this embodiment, the transition metal precursor is prepared by dissolving 0.21 g of silver nitrate or 0.22 g of nickel acetate in 100 ml of distilled water.

2. Step (b)

Then, step (b) of mixing and stirring the solution of step (a) and the carbon precursor.

3 ml of the aqueous transition metal precursor solution prepared in step (a) was stirred at 150 rpm for 30 minutes with 300 mg of Fumaronitrile (C ₄ H ₂ N ₂ ) corresponding to the carbon precursor.

3. Step (c)

Subsequently, the step of hydrothermal synthesis of the solution of step (b) is performed. Specifically, the solution obtained through stirring in step (b) is put into a Teflon liner and then put into an autoclave again to assemble. The assembled high-pressure sterilizer is immersed in a water bath with silicone oil preheated to 200 degrees. Hydrothermal synthesis is performed in the silicone oil bath while stirring at 150 rpm for 15 minutes.

4. Step (d)

Then, the solution of step (c) is cooled. Specifically, after the hydrothermal synthesis is completed, the high-pressure sterilization device is cooled in cold water for 15 minutes. After the additional cooling is complete, the assembled high-pressure sterilizer is dismantled, and then the Teflon liner is opened and 9 ml of distilled water is additionally added. Thereafter, stirring is performed at 400 rpm for 5 minutes using a stirrer.

5. Step (e)

Thereafter, the solution of step (d) is filtered through a filter and then washed. Specifically, after stirring, the obtained solution is filtered using a PTFE membrane as a filter, sufficiently dispersed using distilled water and ethanol as solvents, and then washed by centrifugation several times to remove residual salt by-products.

6. Step (f)

Then, the solution of step (e) is dried. Specifically, when the finally produced solution is stored in an ultra-low temperature freezer at minus 80 ° C. for 1 hour and then freeze-dried for 3 days, carbon quantum dots in the form of powder introduced with a transition metal are produced.

Example 2

Method for producing a coating solution including a carbon-conductive polymer composite using carbon quantum dots into which the transition metal is introduced

In this embodiment, there are several types of conductive polymers, but among them, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was used.

Specifically, 8 mg of powdered nickel or silver-incorporated carbon quantum dots are added to 1 mL of PEDOT:PSS diluted to a concentration of 3% in water, and then dispersed for 30 minutes using a sonicator for uniform dispersion.

Through this, a solution containing a carbon-conductive polymer composite in which carbon quantum dots in which a transition metal is introduced into a conductive polymer is uniformly dispersed is prepared. The prepared solution has a structure in which carbon quantum dots in which a transition metal of about 2 nm to 3 nm is introduced are evenly dispersed between conductive polymers, and through this special structure, as mentioned above, the particle size of the conductive polymer can be increased. As a result, electrical properties are improved by minimizing the resistance generated at the interface between the existing conductive polymer particles, and at the same time, it is possible to uniformly introduce carbon quantum dots, which lack adsorption with fibers, by using the properties of the conductive polymer.

In addition, electrical properties are improved by improving the morphology of existing conductive polymers, as well as hydroxyl groups (-OH), pyridinic-N, pyrrolic-N, and graphene functional groups of carbon quantum dots. Graphic-N can further increase conductivity.

Example 3

Method of forming a conductive coating layer on the fiber with the coating solution

Forming a conductive coating layer on the fiber by immersing the fiber in the coating solution. At this time, the step of forming the conductive coating layer on the fiber is to treat the surface of the fiber with oxygen plasma as a pre-treatment to convert the surface to hydrophilic (g) step; and

It is characterized in that it further comprises the step (h) of adding and mixing an additive for improving the coating ability to the coating solution.

1. Step (g)

This step is to treat the surface of the fiber with oxygen plasma to convert the surface to hydrophilicity.

In this embodiment, the fiber uses spandex, and the spandex is treated for 5 minutes through an oxygen plasma treatment to improve the coating ability by changing the surface to be hydrophilic.

2. Step (h)

This is a step of adding and mixing an additive for improving coating ability to the coating solution. Specifically, 0.5 g of DMSO (Dimethyl Sulfoxide) and 0.1 g of 4-dodecylbenzenesulfonic acid were added to 1 mL of the coating solution (PEDOT: PSS + Ni CQD powder) prepared according to Example 2 to improve the coating ability of the fiber, followed by 20 minutes Disperse in an ultrasonic cleaner.

3. Method of coating fibers with the coating liquid

The spandex treated in step (g) is put into the coating solution prepared in step (h) and treated with an ultrasonic cleaner for 15 minutes. Then, the fibers are taken out and dried at room temperature for 40 minutes. Thereafter, the dried fibers are further dried in an oven at 120° C. for 20 minutes. Thereafter, the above method may be repeated a total of three times to produce a fiber coated with a carbon-conductive polymer composite into which a transition metal is introduced.

Experimental example 1

Characteristics measurement experiment of carbon quantum dots prepared according to the conductive fiber manufacturing method, which is an embodiment of the present invention

4 shows (a) Fourier transform infrared spectroscopy data of carbon quantum dots, (b) UV-visible spectroscopy data for each concentration of carbon quantum dots, (c) excitation of carbon quantum dots for carbon quantum dots of an embodiment of the present invention. Light emission data for each wavelength, (d) photoexcitation data for each emission wavelength of carbon quantum dots, and (e-f) X-ray photoelectron spectroscopy data for carbon quantum dots.

Experimental Example 2

Characteristics measurement experiment of the carbon-conductive polymer composite prepared according to the conductive fiber manufacturing method, which is an embodiment of the present invention

5 is (a) X-ray photoelectron spectroscopy data, (b) ultraviolet-visible photoelectron spectroscopy data, (c-d) atomic force microscope data for a conductive polymer and a carbon-conductive polymer composite of a conductive fiber, which is an embodiment of the present invention. to be.

According to FIG. 5 (a), in the case of the carbon-conductive polymer composite (N-CQD in PEDOT: PSS), it is confirmed that the intensity of PEDOT is increased when compared to the conductive polymer (PEDOT: PSS) in which carbon quantum dots are not introduced. This means that with the introduction of carbon quantum dots, PSS was replaced by carbon quantum dots in the conductive polymer, and the proportion of PEDOT in the resulting conductive polymer increased. Through this, as described above, the specific gravity of PSS, which is an electrical insulator, is reduced and the electrical properties of the carbon-conductive polymer composite are improved compared to the conductive polymer without the introduction of carbon quantum dots due to the introduction of carbon quantum dots having excellent electrical properties. You can expect to get better.

According to FIG. 5 (b), in the case of the carbon-conductive polymer composite (N-CQD in PEDOT: PSS), it is confirmed that the binding energy is reduced when compared to the conductive polymer (PEDOT: PSS) without the introduction of carbon quantum dots. Through the introduction of carbon quantum dots, it can be expected that the morphology of the conductive polymer is modified and the particle size increases. In addition, as described above, it can be expected that as the particle size increases, the resistance generated at the interface decreases and the electrical characteristics are improved.

Experimental Example 3

Electrical Characteristics Measurement Experiment of Conductive Fibers Manufactured in accordance with the Conductive Fiber Manufacturing Method, which is an embodiment of the present invention

6 to 8 will be described.

6 is resistance change data according to temperature of the conductive fiber including the carbon-conductive polymer composite in the conductive fiber according to an embodiment of the present invention.

7 is resistance change data according to temperature of a conductive fiber including a carbon-conductive polymer composite in which Ag is introduced as a metal in the conductive fiber according to an embodiment of the present invention.

8 is resistance change data according to temperature of a conductive fiber including a carbon-conductive polymer composite in which Ni is introduced as a metal in the conductive fiber, which is an embodiment of the present invention.

The measurement of the data was measured using a probestation, and specifically, after fixing the fiber on the slide glass with a copper tape, silver paste was applied to measure the resistance value.

According to the above data, the conductive fiber in which carbon quantum dots were not introduced had a resistance value of 53307 Ω/cm based on 25° C., and the resistance significantly decreased with increasing temperature. On the other hand, in the case of conductive fibers introduced with carbon quantum dots, when PEDOT: PSS and N-CQD were mixed at a volume ratio of 3: 6, the resistance was 1548 Ω/cm based on 25 ° C. In comparison, it was confirmed that the change in resistance with increasing temperature was relatively insignificant. Similarly, resistance of 1738 Ω/cm at 25°C when mixed with Ag-CQD at a volume ratio of 3:6, and resistance of 2176 Ω/cm at 25°C when Ni-CQD was mixed at a volume ratio of 3:6 with PEDOT:PSS When compared to the case of the conductive fiber in which the carbon quantum dots were not introduced, it was confirmed that the change in resistance with increasing temperature was relatively small.

Experimental Example 4

Thermal stability measurement experiment of conductive fibers prepared according to the conductive fiber manufacturing method, which is an embodiment of the present invention

6 to 8 will be described.

6 is resistance change data according to temperature of the conductive fiber including the carbon-conductive polymer composite in the conductive fiber according to an embodiment of the present invention.

7 is resistance change data according to temperature of a conductive fiber including a carbon-conductive polymer composite in which Ag is introduced as a metal in the conductive fiber according to an embodiment of the present invention.

8 is resistance change data according to temperature of a conductive fiber including a carbon-conductive polymer composite in which Ni is introduced as a metal in the conductive fiber, which is an embodiment of the present invention.

The measurement of the data was performed by placing the fabricated conductive fiber sample in a drying oven, setting the starting temperature to 25 ° C, and measuring the resistance value every time the temperature increased by 5 ° C.

According to the above data, when the temperature is changed from 25 ° C to 80 ° C in the case of the conductive fiber without introducing carbon quantum dots, a resistance value change of 51% occurred, 19% in the case of N-CQD and 18% in the case of Ag-CQD. %, a resistance change of 20% was measured for Ni-CQD. Therefore, compared to the conductive fibers without carbon quantum dots, N-CQD improved thermal resistance stability by 2.68 times, Ag-CQD by 2.83 times, and Ni-CQD by 2.55 times.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

100: carbon quantum dots
200: conductive polymer
300: carbon-conductive polymer composite
400: conductive fiber

Claims (18)

preparing a coating solution including a carbon-conductive polymer composite in which carbon quantum dots are dispersed in a conductive polymer; and
Forming a conductive coating layer on the fiber by immersing the fiber in the coating solution,
A method for producing a conductive fiber, characterized in that electrical properties and thermal stability are improved by adding thermal stability to the carbon quantum dots. According to claim 1,
Conductive fiber manufacturing method, characterized in that the carbon quantum dots dispersed in the conductive polymer to reduce the interface resistance of the carbon-conductive polymer composite by modifying the morphology of the conductive polymer. According to claim 1,
The conductive fiber manufacturing method, characterized in that the conductive polymer comprises poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT: PSS). According to claim 1,
The carbon quantum dots are conductive fiber manufacturing method, characterized in that the size of 2nm to 4nm. According to claim 1,
The carbon quantum dots are conductive fiber manufacturing method, characterized in that the metal is introduced carbon quantum dots. According to claim 5,
The method of manufacturing a conductive fiber, characterized in that the metal comprises a transition metal. According to claim 6,
The transition metal is a conductive fiber manufacturing method, characterized in that it comprises nickel or silver. According to claim 5,
The carbon quantum dots into which the metal is introduced are
(a) preparing a metal precursor solution by mixing the metal precursor with distilled water;
Thereafter, (b) step of mixing and stirring the solution of step (a) and the carbon precursor;
Thereafter, (c) step of hydrothermal synthesis of the solution of step (b);
(d) step of cooling the solution of step (c) thereafter;
Thereafter, (e) step of filtering the solution of step (d) with a filter and then washing; and
Then, the conductive fiber manufacturing method, characterized in that produced in step (f) of drying the solution of step (e). According to claim 8,
The carbon precursor in step (b) comprises Fumaronitrile (C ₄ H ₂ N ₂ ). According to claim 1,
Forming a conductive coating layer on the fiber is a pretreatment
(g) converting the surface of the fiber into a hydrophilic property by treating the surface of the fiber with oxygen plasma; and
Conductive fiber manufacturing method characterized in that it further comprises the step (h) of adding and mixing an additive for improving the coating ability to the coating solution. According to claim 10,
The conductive fiber manufacturing method, characterized in that the additives in step (h) include dimethyl sulfoxide (DMSO) and 4-dodecylbenzenesulfonic acid. fiber; and
A conductive coating layer disposed on the fiber and including a carbon-conductive polymer composite in which carbon quantum dots are dispersed in a conductive polymer,
A conductive fiber characterized by improved electrical properties and thermal stability. According to claim 12,
The carbon quantum dots dispersed in the conductive polymer transform the morphology of the conductive polymer to reduce the interface resistance of the carbon-conductive polymer composite. According to claim 12,
The conductive polymer is a conductive fiber, characterized in that it comprises poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT: PSS). According to claim 12,
The carbon quantum dots are conductive fibers, characterized in that the size of 2nm to 4nm. According to claim 12,
The carbon quantum dots are conductive fibers, characterized in that the metal is introduced carbon quantum dots. According to claim 16,
The conductive fiber, characterized in that the metal comprises a transition metal. According to claim 17,
The transition metal is conductive fiber, characterized in that it comprises nickel or silver.

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