KR100478145B1 - Method for Manufacturing Carbon Nano Fiber - Google Patents

Method for Manufacturing Carbon Nano Fiber Download PDF

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Publication number
KR100478145B1
KR100478145B1 KR10-2002-0011839A KR20020011839A KR100478145B1 KR 100478145 B1 KR100478145 B1 KR 100478145B1 KR 20020011839 A KR20020011839 A KR 20020011839A KR 100478145 B1 KR100478145 B1 KR 100478145B1
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gas
carbon nanofibers
carbon
catalyst
nanofibers
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KR10-2002-0011839A
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Korean (ko)
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KR20030072687A (en
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강흥원
이상대
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재단법인 포항산업과학연구원
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
    • D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
    • D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D04H1/4242—Carbon fibres

Abstract

본 발명은 탄소나노섬유(carbon nano fiber)을 제조하는 방법에 관한 것으로서, 철 및 탄화철 분말을 촉매물질로 이용하여 기판없이 촉매 입자 상에서 화학기상증착함으로써 나노스케일급의 탄소나노섬유를 보다 간편하고 보다 경제적으로 그리고 대량으로 제조할 수 있는 방법을 제공하고자 하는데, 그 목적이 있는 것이다. The present invention relates to a method for producing carbon nanofibers, and by using chemical vapor deposition on catalyst particles without a substrate using iron and iron carbide powders as catalysts, nanoscale carbon nanofibers are more convenient and more convenient. The aim is to provide a method that can be manufactured economically and in large quantities.

본 발명은 촉매를 이용하여 탄소소스가스를 열분해하여 촉매상에서 합성하여 탄소나노섬유를 제조하는 방법에 있어서, 상기 촉매로서 탄화철분말 또는 20%이상의 기공율을 갖는 철분말 또는 이들의 복합분말을 사용하여 탄소 소스 가스를 공급하면서 기상에서 합성하여 탄소나노섬유를 제조하는 방법을 그 요지로 한다.The present invention is a method for producing carbon nanofibers by pyrolyzing a carbon source gas using a catalyst to synthesize on a catalyst, wherein the carbon using iron carbide powder or an iron powder having a porosity of 20% or more, or a composite powder thereof. Summary of the Invention The method for producing carbon nanofibers by synthesizing in a gas phase while supplying a source gas is provided.

Description

탄소나노섬유의 제조방법{Method for Manufacturing Carbon Nano Fiber}  Method for Manufacturing Carbon Nano Fiber}

본 발명은 전기이중층 슈퍼캐패시터(EDLC) 전극, 고분자 전해질 연료전지 (PEMFC) 전극, Li 이온 이차전지(LIB 또는 LPB)의 부극소재, 전자파 차폐재료 등에 이용될 수 있는 탄소나노섬유(carbon nano fiber)을 제조하는 방법에 관한 것으로서, 보다 상세하게는 철 또는 탄화철(Fe3C 또는 Fe5C2등, 이하 "탄화철"이라 칭함)분말을 촉매로 사용하여 기판없이 촉매입자상에서 기상 증착시켜 탄소나노섬유를 제조하는 방법에 관한 것이다.The present invention provides carbon nanofibers that can be used in an electric double layer supercapacitor (EDLC) electrode, a polymer electrolyte fuel cell (PEMFC) electrode, a negative electrode material of a Li ion secondary battery (LIB or LPB), an electromagnetic wave shielding material, and the like. The present invention relates to a method for preparing carbon nanofibers by vapor deposition on catalyst particles without a substrate using iron or iron carbide (Fe 3 C or Fe 5 C 2, etc., hereinafter referred to as "iron carbide") powder as a catalyst. It relates to a method of manufacturing.

탄소섬유는 전기이중층 슈퍼캐패시터(EDLC) 전극, 고분자 전해질 연료전지 (PEMFC) 전극, Li 이온 이차전지(LIB 또는 LPB)의 부극소재, 전자파 차폐재료 등을 제조하는데 이용될 수 있다. Carbon fiber may be used to manufacture an electric double layer supercapacitor (EDLC) electrode, a polymer electrolyte fuel cell (PEMFC) electrode, a negative electrode material of a Li ion secondary battery (LIB or LPB), an electromagnetic wave shielding material, and the like.

일반적으로, 탄소섬유와 같은 극세섬유를 전극제조에 이용할 경우에는 기존의 전극에 비해서 아주 얇은 두께로 제조가 가능하므로, 탄소섬유는 에너지 밀도를 증가시키고 내부저항을 감소시키는 효과가 있을 것으로 예상되므로 직경은 작을 수록 바람직하며 탄소나노튜브와 더불어 차세대 핵심소재로 기대할 수 있다. In general, when the ultrafine fibers such as carbon fibers are used for electrode production, they can be manufactured to have a very thin thickness compared to the conventional electrodes, so the carbon fibers are expected to have an effect of increasing the energy density and reducing the internal resistance. Smaller is more desirable and can be expected to be the next generation core material along with carbon nanotubes.

상기 탄소섬유의 제조방법으로는 대한민국 특허공보 제2001-0081219호에 제시되어 있는 방법을 들 수 있는데, 이 방법은 콜타르 핏치를 루이스 촉매와 할로겐 공촉매를 사용하여 중축합하여 저융점화하고 불활성 기체로 분사하여 프리커스 핏치를 만들고 이것을 방사하여 탄소섬유를 제조하는 방법이다.The carbon fiber may be prepared by the method disclosed in Korean Patent Publication No. 2001-0081219, which is a coal tar pitch using a Lewis catalyst and a halogen cocatalyst to polycondensate low melting point and inert gas. It is a method of making carbon fibers by spraying and making a fructus pitch.

그러나, 상기 탄소섬유의 제조방법은 복잡할 뿐만 아니라 제조되는 섬유는 5-15 μm로 미크론 스케일로 나오기 때문에 나노스케일로 미세화하는데는 문제가 있다. However, the production method of the carbon fiber is not only complicated, but also has a problem in miniaturizing to nanoscale because the fiber is produced on a micron scale of 5-15 μm.

또한, 상기 탄소나노섬유는 대한민국 특허공보 제2001-0049398과 같이 탄소나노튜브를 제조할 때 탄소나노튜브와 함께 부산물로서 출현하기 때문에 분리정제하여 이용하기 보다는 탄소나노튜브의 순도를 떨어뜨리는 불순물로 인식되어 왔다.In addition, the carbon nanofiber is recognized as an impurity that lowers the purity of the carbon nanotubes rather than being separated and used because they appear as a by-product when the carbon nanotubes are manufactured as carbon nanotubes, as disclosed in Korean Patent Publication No. 2001-0049398. Has been.

본 발명은 철 및 탄화철 분말을 촉매물질로 이용하여 기판과 같은 보조수단없이 촉매입자상에서 화학기상증착함으로써 탄소나노튜브와 같은 다른 상이 존재하지 않는 고순도의 탄소나노섬유를 보다 간편하고 보다 경제적으로 그리고 대량으로 제조할 수 있는 방법을 제공하고자 하는데, 그 목적이 있는 것이다. The present invention provides a simpler, more economical and more bulky way to produce high purity carbon nanofibers in which other phases such as carbon nanotubes do not exist by chemical vapor deposition on catalyst particles without using an auxiliary means such as a substrate by using iron and iron carbide powder as catalyst materials. To provide a method that can be prepared by, its purpose is to.

이하, 본 발명에 대하여 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.

본 발명은 촉매를 이용하여 탄소소스가스를 열분해하여 촉매상에서 합성하여 탄소나노섬유를 제조하는 방법에 있어서, 상기 촉매로서 탄화철분말 또는 20%이상의 기공율을 갖는 철분말 또는 이들의 복합분말을 사용하여 기판과 같은 보조수단 없이 탄소 소스 가스를 공급하면서 기상에서 합성하여 탄소나노섬유를 제조하는 방법에 관한 것이다.The present invention is a method for producing carbon nanofibers by pyrolyzing a carbon source gas using a catalyst to synthesize on a catalyst, the substrate using iron carbide powder or iron powder having a porosity of 20% or more or a composite powder thereof as the catalyst The present invention relates to a method for producing carbon nanofibers by synthesizing in a gas phase while supplying a carbon source gas without an auxiliary means such as the same.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

상기 촉매 분말은 입경 1mm 이하를 사용하는 것이 바람직하다.It is preferable that the catalyst powder uses a particle diameter of 1 mm or less.

촉매로서 사용될 수 있는 철분말은 기공이 20%이상이 되어야 한다. Iron powder that can be used as a catalyst should have 20% or more of pores.

상기 탄소나노섬유의 합성은 450-650 ℃의 온도에서 행하는 것이 바람직하다. Synthesis of the carbon nanofibers is preferably carried out at a temperature of 450-650 ℃.

압력은 수율과는 관계가 있을 수 있으나 합성여부와는 상관이 없다.Pressure may be related to yield, but not synthetic.

상기 탄소나노섬유의 합성을 위해 탄소 소스 가스로서는 아세틸렌가스, 메탄가스, 프로판가스, 에틸렌 가스 또는 일산화탄소 또는 이들 가스의 2종이상의 혼합가스 또는 이들 가스와 수소의 혼합가스들을 들수 있다.For the synthesis of the carbon nanofibers, the carbon source gas may be acetylene gas, methane gas, propane gas, ethylene gas or carbon monoxide or two or more kinds of mixed gases of these gases or mixed gases of these gases and hydrogen.

본 발명에 의한 탄소나노섬유의 제조방법은 상기 탄소나노섬유의 합성과 같은 위치(in-situ)에서 행해지는 상기 탄소나노섬유의 정제 단계를 더 포함할 수 있다.The method for producing carbon nanofibers according to the present invention may further include the step of purifying the carbon nanofibers performed at the same position (in-situ) as the synthesis of the carbon nanofibers.

상기 정제 단계는 350-600 ℃의 온도에서 상기 탄소나노섬유에 암모니아 가스, 수소가스, 산소가스 또는 공기를 공급함으로써 행해진다.The purification step is performed by supplying ammonia gas, hydrogen gas, oxygen gas or air to the carbon nanofibers at a temperature of 350-600 ° C.

본 발명에 따른 탄소나노섬유의 제조방법에 의하면 철 및 탄화철을 촉매로 기상에서 합성함으로써 높은 촉매 반응성을 이용하여 기판과 같은 보조수단 없이도 고품질의 탄소나노섬유를 대량으로 합성하는 것이 가능하다. According to the method for producing carbon nanofibers according to the present invention, it is possible to synthesize high-quality carbon nanofibers in large quantities without using an auxiliary means such as a substrate by using high catalytic reactivity by synthesizing iron and iron carbide in a gas phase as a catalyst.

뿐만 아니라 탄소나노섬유의 대량 합성시 본 발명을 응용한 연속공정의 구현이 용이하므로 매우 효율적이며 저렴하게 탄소나노섬유를 생산할 수 있을 것으로 기대된다.In addition, the carbon nanofibers are expected to be able to produce carbon nanofibers very efficiently and inexpensively since it is easy to implement a continuous process applying the present invention when synthesizing a large amount of carbon nanofibers.

이하, 본 발명의 바람직한 실시 예에 따라 탄소나노섬유를 제조할 수 있는 장치의 일례를 나타내는 도 1을 통해 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to FIG. 1, which shows an example of a device capable of manufacturing carbon nanofibers according to a preferred embodiment of the present invention.

도 1에 나타난 바와 같이, 본 발명에 따라 탄소나노섬유를 제조할 수 있는 탄소나노섬유제조장치는 석영으로 이루어지는 반응튜브(10), 이 반응튜브(10)의 내부에 위치되는 보트(4), 및 반응튜브(10)의 외주에 구비되는 저항 발열체(24)를 포함한다. As shown in FIG. 1, a carbon nanofiber manufacturing apparatus capable of manufacturing carbon nanofibers according to the present invention includes a reaction tube 10 made of quartz, a boat 4 located inside the reaction tube 10, And a resistance heating element 24 provided on an outer circumference of the reaction tube 10.

상기 반응튜브(10)의 가스유입구(12) 및 가스배출구(14)에는 각각 가스유입밸브 (11) 및 가스배출밸브(32)가 구비되어 있다.The gas inlet 12 and the gas outlet 14 of the reaction tube 10 are provided with a gas inlet valve 11 and a gas outlet valve 32, respectively.

상기 저항 발열체 (24)는 코일형태로 구성될 수 있다.The resistance heating element 24 may be configured in the form of a coil.

상기 탄소나노섬유제조장치를 이용하여 보트(4)에 촉매분말(50)을 넣고 반응튜브 (10)내의 균열대에 놓고 질소가스로 소정의 온도까지 승온시킨다. 그 후 탄소소스가스로 치환하여 소정시간 통입 후 수소가스로 치환하여 자연냉각시킴으로써 탄소나노섬유가 제조된다.Using the carbon nanofiber manufacturing apparatus, the catalyst powder 50 is placed in the boat 4, placed in a crack in the reaction tube 10, and heated to a predetermined temperature with nitrogen gas. Subsequently, the carbon nanofibers are manufactured by substituting with carbon source gas, injecting with hydrogen gas for a predetermined time, and then naturally cooling by substituting with hydrogen gas.

이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

(실시예)(Example)

실시예 1Example 1

먼저 탄화철 촉매 분말을 알루미나 보트에 넣어 상기 반응튜브내에 위치시켰다. The iron carbide catalyst powder was first placed in an alumina boat and placed in the reaction tube.

질소가스 분위기에서 600℃까지 승온한 후 아세틸렌 가스 및 수소의 혼합가스 (혼합비 1:1)를 600 SCCM을 20분간 흘렸다. 그 후 질소가스 분위기에서 상온까지 냉각하였다. 촉매물질은 검은 물질로 변하여 약 12배의 무게 증가가 있었으며 투과성전자현미경(TEM)으로 관찰한 결과, 도 2a의 투과성전자현미경 사진에도 나타나 있는 바와 같이, 직경 약 50-300 nm의 섬유상의 탄소나노섬유가 생성되어 있음을 확인하였다.After heating up to 600 degreeC in nitrogen gas atmosphere, 600 SCCM was flown for 20 minutes through the mixed gas of acetylene gas and hydrogen (mixture ratio 1: 1). Thereafter, the mixture was cooled to room temperature in a nitrogen gas atmosphere. The catalyst material turned black and had a weight increase of about 12 times. As a result of observing with a transmission electron microscope (TEM), as shown in the transmission electron micrograph of FIG. 2A, fibrous carbon nanoparticles having a diameter of about 50-300 nm It was confirmed that fibers were produced.

여기서는 도 1의 탄소나노섬유제조장치를 사용하였다. Here, the carbon nanofiber manufacturing apparatus of FIG. 1 was used.

실시예 2Example 2

먼저 철 분말을 촉매로 이용하여 알루미나 보트에 넣어 상기 반응튜브내에 위치시켰다.First, iron powder was used as a catalyst, placed in an alumina boat, and placed in the reaction tube.

질소가스 분위기에서 630℃까지 승온한 후 일산화탄소 가스 300 SCCM을 20분간 흘렸다. 그 후 질소가스 분위기에서 상온까지 냉각하였다. 촉매물질은 검은 물질로 변하여 약 7배의 무게 증가가 있었으며 투과성전자현미경(TEM)으로 관찰한 결과, 도 2b의 투과성전자현미경 사진에도 나타나 있는 바와 같이, 직경 약 50-300 nm의 탄소나노섬유가 생성되어 있음을 확인하였다.After heating up to 630 degreeC in nitrogen gas atmosphere, 300 SCCM of carbon monoxide gas was flowed for 20 minutes. Thereafter, the mixture was cooled to room temperature in a nitrogen gas atmosphere. The catalyst material turned black and had a weight increase of about 7 times. As observed by the transmission electron microscope (TEM), as shown in the transmission electron micrograph of FIG. 2B, carbon nanofibers having a diameter of about 50-300 nm It was confirmed that it was produced.

본 명세서 및 첨부 도면에는 최적의 실시 예를 개시하였다. 여기에서 특정한 용어들이 사용되었으나, 이는 단지 본 발명을 설명하기 위한 목적에서 사용된 것으로, 의미를 한정하거나 발명의 범위를 제한하기 위하여 사용되는 것은 아니다.The present specification and the annexed drawings disclose optimal embodiments. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the meaning or the scope of the invention.

상술한 바와 같이, 본 발명은 반응튜브 내의 압력과 상관없이 촉매 분말에 소정 온도의 탄소 소스 가스를 공급함으로써 탄소나노섬유를 간단히 제조할 수 있는 효과가 있는 것이다.As described above, the present invention has the effect that the carbon nanofibers can be easily produced by supplying the carbon source gas at a predetermined temperature to the catalyst powder regardless of the pressure in the reaction tube.

또한, 본 발명은 종래방법에 비하여 매우 저렴하게 탄소나노섬유를 제조할 수 있을 뿐만 아니라 대량 생산에도 적합하게 적용될 수 있는 효과가 있는 것이다.In addition, the present invention is not only able to manufacture carbon nanofibers at a very low cost as compared to the conventional method, but also has an effect that can be suitably applied to mass production.

이상, 본 발명을 바람직한 실시 예를 들어 상세하게 설명하였으나, 본 발명은 상기 실시 예에 한정되지 않고, 본 발명의 기술적 사상의 범위 내에서 당 분야에서 통상의 지식을 가진 자에 의하여 여러 가지 변형이 가능하다.In the above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. It is possible.

도 1은 본 발명에 따라 탄소나노섬유를 제조하기 위한 장치의 일례를 나타내는 개략도도 2는 실시예 1 및 실시예 2에 대한 투과성전자현미경(TEM)의 관찰결과를 나타내는 사진Figure 1 is a schematic diagram showing an example of an apparatus for producing carbon nanofibers according to the present invention Figure 2 is a photograph showing the results of observation of the transmission electron microscope (TEM) for Examples 1 and 2

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

4 . . . 보트 10 . . . 반응튜브 24 . . . 저항발열체 4 . . . Boat 10. . . Reaction tube 24. . . Resistance heating element

50 . . . 촉매분말50. . . Catalyst powder

Claims (7)

촉매를 이용하여 탄소소스가스를 열분해하여 촉매상에서 합성하여 탄소나노섬유를 제조하는 방법에 있어서, 상기 촉매로서 입경이 1 mm 이하인 탄화철분말 또는 입경이 1 mm 이하이고 20%이상의 기공율을 갖는 철분말 또는 이들의 복합분말을 사용하여 탄소소스가스를 공급하면서 기판과 같은 보조수단 없이 화학기상증착으로 합성하여 고순도의 탄소나노섬유를 제조하는 것을 특징으로 하는 탄소나노섬유의 제조방법A method for producing carbon nanofibers by pyrolyzing a carbon source gas using a catalyst and synthesizing on a catalyst, wherein the catalyst is an iron carbide powder having a particle size of 1 mm or less or an iron powder having a particle size of 1 mm or less and having a porosity of 20% or more. Method for producing carbon nanofibers, characterized in that the production of high-purity carbon nanofibers by synthesizing by chemical vapor deposition without auxiliary means such as substrate while supplying carbon source gas using these composite powders 제1항에 있어서, 상기 탄소나노섬유의 기상합성온도가 450-650℃의 온도에서 행해지는 것을 특징으로 하는 탄소나노섬유의 제조방법. The method for producing carbon nanofibers according to claim 1, wherein the gas phase synthesis temperature of the carbon nanofibers is performed at a temperature of 450-650 ° C. 제1항 또는 제2항에 있어서, 탄소소스가스가 아세틸렌가스, 메탄가스, 프로판가스, 에틸렌 가스 및 일산화탄소 가스로 이루어진 가스그룹으로부터 선택된 1종 또는 2종 이상의 혼합가스 또는 상기 가스그룹으로부터 선택된 1종의 가스와 수소가스로 이루어지는 수소함유가스 또는 상기 가스그룹으로부터 선택된 2종이상의 혼합가스와 수소가스로 이루어지는 수소함유혼합가스인 것을 특징으로 하는 탄소나노섬유의 제조방법. The carbon source gas according to claim 1 or 2, wherein the carbon source gas is at least one selected from a gas group consisting of acetylene gas, methane gas, propane gas, ethylene gas and carbon monoxide gas, or at least one selected from the gas group. A method for producing carbon nanofibers, characterized in that the hydrogen-containing gas consisting of a gas and a hydrogen gas or a hydrogen-containing mixed gas consisting of two or more kinds of mixed gas and hydrogen gas selected from the gas group. 제1항 또는 제2항에 있어서, 상기 탄소나노섬유의 합성과 같은 위치(in-situ)에서상기 탄소나노섬유를 정제하는 단계를 더 포함하는 것을 특징으로 하는 탄소나노섬유의 제조방법.The method of claim 1 or 2, further comprising the step of purifying the carbon nanofibers at the same position (in-situ) as the synthesis of the carbon nanofibers. 제3항에 있어서, 상기 탄소나노섬유의 합성과 같은 위치(in-situ)에서 상기 탄소나노섬유를 정제하는 단계를 더 포함하는 것을 특징으로 하는 탄소나노섬유의 제조방법.The method of claim 3, further comprising purifying the carbon nanofibers at the same position (in-situ) as the synthesis of the carbon nanofibers. 제4항에 있어서, 상기 탄소나노섬유의 정제가 350-600℃의 온도에서 행해지는 것을 특징으로 하는 탄소나노섬유의 제조방법.The method for producing carbon nanofibers according to claim 4, wherein the purification of the carbon nanofibers is performed at a temperature of 350-600 ° C. 제5항에 있어서, 상기 탄소나노섬유의 정제가 350-600℃의 온도에서 행해지는 것을 특징으로 하는 탄소나노섬유의 제조방법.The method for producing carbon nanofibers according to claim 5, wherein the purification of the carbon nanofibers is performed at a temperature of 350-600 ° C.
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