Method for catalytically synthesizing carbon nanowires on the surface of carbon fiber cloth

Abstract

The method for synthesizing carbon nanowires on the surface of carbon fiber cloth comprises the following steps: growing metal organic framework material ZIF-67 on the surface of carbon fiber cloth, making ZIF-67 decompose and reduce through a chemical vapor deposition process to generate Co nanoparticles, and finally, successfully synthesizing carbon nanowires under the atmosphere of anhydrous ethanol as a carbon source. The carbon / carbon composite material is prepared by stacking the carbon cloth with carbon nanowires on the surface, and the interlaminar shear strength of the carbon / carbon composite material is increased by about 90% compared with that of the pure carbon cloth stacking. The anhydrous ethanol is used as a carbon source, and a more suitable growth atmosphere for the catalytic synthesis of carbon nanowires is created for Co catalyst particles; the synthesized carbon nanowires are uniform in size, high in purity, and uniformly dispersed on the surface of carbon fibers, and the method is simple, controllable, environmentally friendly, pollution-free, low in cost and suitable for industrial production.

Description

Technical Field

[0001] This invention relates to the field of carbon nanowire preparation technology, specifically a method for synthesizing carbon nanowires by loading a metal-organic framework material ZIF-67 as a catalyst precursor onto the surface of carbon fiber cloth and using chemical vapor deposition. Background Technology

[0002] Nanowire materials typically possess radial dimensions at the nanometer scale and axial dimensions at the micrometer scale. Their unique size and structure enable them to play a significant role in toughening composite materials and other functional applications. Carbon nanowires are one-dimensional nanomaterials constructed from carbon. Compared to carbon nanotubes, carbon nanowires have a solid structure, typically composed of stacked amorphous graphite with a lower degree of graphitization. The unique chemical and physical properties of carbon nanowires have led to their widespread application in composite material toughening, electrode materials, hydrogen storage materials, and microwave absorbing materials.

[0003] Currently, research on carbon nanowires mainly focuses on stable preparation processes for carbon nanowire materials. Existing preparation processes for carbon nanowires include spinning pyrolysis, template conversion, and chemical vapor deposition.

[0004] Spinning pyrolysis is a commonly used process for the industrial production of carbon nanowires. This process mainly consists of two steps: first, spinning to obtain organic filaments, and second, carbonizing the organic filaments to obtain carbon nanowire materials. Among the publicly available literature retrieved, George D, Garcia A, Pham Q, et al. Fabrication of patterned graphitized carbon wires using low-voltage near-field electrospinning, pyrolysis, electrodeposition, and chemical vapor deposition [J]. Microsystems & Nanoengineering, 2020, 6(1) reported a method for preparing carbon nanowires by low-voltage near-field electrospinning. The authors of this paper first prepared polyacrylonitrile fine wires by electrospinning, and then controlled the diameter of the polyacrylonitrile fine wires by controlling the electric field and the spinneret. Finally, they used pyrolysis to carbonize the polyacrylonitrile wires, and finally obtained carbon nanowires with a diameter of about 50 nm. Although the spinning pyrolysis method can quickly produce a large number of carbon nanowires with stable structures, this method is only suitable for producing carbon nanowires with specific structures and cannot be used to introduce carbon nanowires into objects with complex structures.

[0005] Template conversion is more flexible than spinning pyrolysis, allowing carbon materials to be synthesized by attaching to the template material structure, thus enabling the synthesis of carbon nanowires at specified locations. In Shen LF, Lv HF, Chen SQ, et al. Peapod-like Li3VO4 / N-Doped Carbon Nanowires with Pseudocap acitive Properties as Advanced Materials for High-Energy Lithium-Ion Capacitors[J]. Advanced Materials, 2017, 29(27), the authors used template conversion to prepare carbon nanowires. In this paper, V2O5 nanowires were used as templates to polymerize dopamine materials on the surface of V2O5 nanowires, forming a polydopamine core-shell structure. The samples were then subjected to high-temperature heat treatment, ultimately carbonizing to obtain carbon nanowire materials. Although template conversion can easily and effectively obtain carbon nanowire materials, and the morphology and position of the synthesized carbon nanowires can be controlled by the template material, the carbon nanowires obtained by this method often contain residual template material, resulting in low purity.

[0006] Therefore, how to easily and rapidly prepare high-purity carbon nanowires, while simultaneously achieving in-situ synthesis of carbon nanowires in complex structures, is a problem worth solving. In summary, chemical vapor deposition (CVD) is chosen as the method for preparing carbon nanowire materials, as it satisfies both of these requirements. CVD refers to a process in which reactants undergo a chemical reaction in a gaseous state within a confined space, and the reaction products then settle onto the surface of a support, ultimately yielding a specific synthesized product.

[0007] Numerous reports on the preparation of carbon nanotubes via chemical vapor deposition have been found in the retrieved public literature. For example, in Feng L, Li KZ, Sun JJ, et al. Influence of carbon nanotube extending length on pyrocarbon microstructure and mechanical behavior of carbon / carbon composites [J]. Applied Surface Science, 2015, 355: 1020-1027, the authors slowly injected an ethanol solution containing ferrocene into a high-temperature tube furnace, ultimately successfully synthesizing a large number of carbon nanotubes on the surface of carbon fiber cloth. Ferrocene, acting as a catalyst precursor, can be pyrolyzed and reduced to Fe nanocatalyst particles under high-temperature conditions; ethanol, acting as a carbon source precursor, can provide a carbon source for the catalyst particles after high-temperature decomposition. The resulting carbon nanotubes are uniformly distributed on the surface of the carbon fiber cloth. Besides ferrocene as a catalyst precursor, many studies have also reported the potential of ZIF-67 materials in metal-organic frameworks to derive carbon nanotubes.

[0008] Metal-organic frameworks (MOFs) are nanomaterials constructed using metal ions as central ions and organic compounds as ligands. ZIF-67, however, uses 2-methylimidazole as the organic ligand and Co... 2+ As the central ion, Co... 2+ It can also be reduced to Co nanoparticles with catalytic activity. In Zhu XY, Qiu HF, Chen P, et al. Anemone-shaped ZIF-67@CNTs as effective electromagnetic absorbent covered the whole X-band[J]. Carbon, 2021, 173: 1-10, ZIF-67 was used as a catalyst precursor, and melamine powder was used as a carbon source. The two were mixed and calcined at high temperature to obtain "pom-shaped" nanomaterials in which carbon nanotubes grew around ZIF-67 grains.

[0009] It is worth noting that in the currently available literature, most carbon nanomaterials obtained by chemical vapor deposition (CVD) are carbon nanotubes, with few reports on the synthesis of carbon nanowires using CVD. While Pan HX, Yin XW, Xue JM, et al. The microstructures, growth mechanisms and properties of carbon nanowires and nanotubes fabricated at different CVD temperatures [J]. Diamond and Related Materials, 2017, 72: 77-86 successfully synthesized carbon nanowires in situ by controlling the growth temperature of Ni nanoparticles, the growth temperature range for carbon nanowires is narrow, and slight changes in the growth temperature can lead to the disappearance of carbon nanowires, resulting in the regeneration of carbon nanotubes. Therefore, the current CVD method for synthesizing carbon nanowires suffers from problems of process instability and uneven product synthesis.

[0010] Fe, Co, and Ni nanoparticles are currently the most commonly used catalysts for carbon nanotube growth. Carbon atoms are absorbed by these catalyst particles and then precipitated to form carbon nanotubes through the inductive effect of the particles. The structural difference between carbon nanotubes and carbon nanowires lies in the fact that carbon nanotubes can be considered as graphite sheets rolled up parallel to the nanotube axis, while carbon nanowires are formed by stacking graphite sheets perpendicular to the axis. Therefore, a crucial factor affecting the catalytic synthesis of carbon nanotubes or carbon nanowires via chemical vapor deposition (CVD) is the inductive effect of the catalyst particles. Selecting suitable catalyst particles and controlling the influence of the growth atmosphere on the catalyst particles are key factors for the successful and stable preparation of carbon nanowires via CVD. Summary of the Invention

[0011] To overcome the instability of the existing chemical vapor deposition process for preparing carbon nanowires, this invention proposes a method for catalytic synthesis of carbon nanowires on the surface of carbon fiber cloth.

[0012] The specific process of this invention is as follows:

[0013] Step 1, carbon fiber cloth pretreatment:

[0014] Step 2, prepare the mixed solution:

[0015] The mixed solution is prepared by mixing cobalt nitrate solution and 2-methylimidazole solution.

[0016] To prepare the mixed solution, cobalt nitrate solution and 2-methylimidazole were mixed in a volume ratio of 1:1 and magnetically stirred for 60 seconds to obtain the mixed solution.

[0017] The cobalt nitrate solution is prepared by dissolving cobalt nitrate hexahydrate powder in methanol and stirring until homogeneous. The concentration of the cobalt nitrate solution is 0.04 mol / L.

[0018] The 2-methylimidazole solution was prepared by dissolving 2-methylimidazole powder in methanol and stirring until homogeneous. The concentration of the 2-methylimidazole solution was 0.16 mol / L.

[0019] Step 3, ZIF-67 is mounted on the surface of the carbon fiber cloth:

[0020] The specific process of mounting ZIF-67 on the surface of carbon fiber cloth is as follows:

[0021] I. Synthesis of ZIF-67. Carbon fiber cloth was immersed in the mixed solution and kept in a water bath at 30°C for 1 hour to allow cobalt nitrate in the mixed solution to react with 2-methylimidazole to synthesize ZIF-67. Carbon fiber cloth with ZIF-67 coated on its surface was obtained.

[0022] II. Washing the carbon cloth. Remove the carbon fiber cloth with ZIF-67 coating and wash it three times with methanol reagent. Dry it in a 70℃ oven until ready for use.

[0023] Step 4, heating the tubular heat treatment furnace:

[0024] The temperature of the tubular heat treatment furnace is the deposition temperature; the deposition temperature is 700℃~900℃.

[0025] When the tubular heat treatment furnace is heated, argon gas is continuously introduced into the tubular heat treatment furnace at a flow rate of 200 sccm until the tubular heat treatment furnace is heated to the set deposition temperature; the heating rate is 5℃ / min.

[0026] Step 5: Synthesis of carbon nanowires by chemical vapor deposition:

[0027] Once the temperature inside the tubular heat treatment furnace reaches the deposition temperature, chemical vapor deposition (CVD) is performed. The argon flow rate is adjusted to 500 sccm. Anhydrous ethanol is injected into the furnace at a rate of 10 mL / h. Injection continues for 2 to 7.5 hours. The carbon fiber cloth is then allowed to cool to room temperature with the furnace, resulting in carbon nanowire materials on the surface of the carbon fiber cloth.

[0028] The carbon nanowire material on the surface of the carbon fiber cloth is dark black.

[0029] This invention first loads ZIF-67 onto the surface of carbon fiber cloth as a catalyst precursor. Through chemical vapor deposition, ZIF-67 catalyzes the synthesis of a large number of carbon nanowires, achieving stable and uniform synthesis of carbon nanowires on the surface of carbon fiber cloth.

[0030] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0031] This invention proposes a method for catalytic synthesis of carbon on the surface of carbon fiber cloth. First, a metal-organic framework material ZIF-67 is grown on the surface of the carbon fiber cloth. Then, a chemical vapor deposition process is used to decompose and reduce ZIF-67, producing Co nanoparticles. Finally, the Co nanoparticles are successfully catalytically synthesized into carbon nanowires under an atmosphere where anhydrous ethanol is used as the carbon source. The carbon cloth with carbon nanowires grown on its surface obtained by this invention is laminated to prepare a carbon / carbon composite material, whose interlaminar shear strength is about 90% higher than that of a carbon / carbon composite material laminated with pure carbon cloth. In Feng L, Li KZ, Sun JJ, et al. Influence of carbon nanotube extending length on pyrocarbon microstructure and mechanical behavior of carbon / carbon composites[J]. Applied Surface Science, 2015, 355: 1020-1027, the authors used chemical vapor deposition to prepare carbon nanotubes of different lengths on the surface of carbon fiber cloth. The chemical vapor deposition method used in this application is consistent with that literature.

[0032] Compared to the technical solution disclosed in the literature, which uses ferrocene as a catalyst precursor to catalyze the synthesis of carbon nanotubes via chemical vapor deposition, this invention uses ZIF-67 as a catalyst precursor on the surface of carbon fiber cloth to ultimately catalyze the synthesis of carbon nanowires. This is because ferrocene is reduced to Fe catalyst particles at high temperatures, while ZIF-67 is reduced to Co catalyst particles. Therefore, although both are in the same growth atmosphere, the phase stability of the catalyst particles differs. The former, the Fe catalyst particles, should maintain a solid-liquid coexistence state during growth, resulting in graphite sheets precipitated after absorbing the carbon source being parallel to the growth direction, ultimately yielding a hollow carbon nanotube structure. The latter, the Co catalyst particles, should exist only in a solid state during growth, thus the precipitated graphite sheets are perpendicular to the growth direction, ultimately yielding a solid carbon nanowire structure.

[0033] In this invention, anhydrous ethanol is used as the carbon source to synthesize carbon nanowires via catalysis. This is compared with the paper "Anemone-shaped ZIF-67@CNTs as effective electromagnetic absorbent covered the whole X-band" [J], which uses ZIF-67 as a catalyst precursor and melamine as a carbon source to synthesize carbon nanotubes via high-temperature calcination. The difference between using melamine as a carbon source and using melamine as a carbon source is that the former's decomposition products contain C, H, and N elements, while the latter's decomposition products contain C, H, and O elements. The O element combines with the Co catalyst particles, which are the reduction products of ZIF-67, to form a CoO phase. It is known that the melting point of elemental Co is 1495℃, and the melting point of the CoO phase is 1935℃. Therefore, within the growth temperature range given in this application, the former, when used as catalyst particles, will exhibit surface micro-melting, i.e., a solid-liquid state exists, while the latter, when used as catalyst particles, is less likely to exhibit micro-melting and exists in a solid form. In summary, this application uses anhydrous ethanol as a carbon source, which can create a growth environment more suitable for the catalytic synthesis of carbon nanowires for Co catalyst particles.

[0034] In the attached diagram, Figure 1 The image shows a SEM image of the carbon fiber cloth with ZIF-67 coated on its surface obtained in step 3 of the above preparation method. ZIF-67 is uniformly dispersed on the carbon fiber surface, with individual ZIF-67 grains having a diameter of approximately 1000–1500 nm. Following the technique described in Zhu XY, Qiu HF, Chen P, et al. Anemone-shaped ZIF-67@CNTs as effective electromagnetic absorbent covered the whole X-band [J]. Carbon, 2021, 173: 1-10, the synthesized carbon nanotubes are as follows... Figure 2 , Figure 3 As shown; according to the technical process described in this invention application, the carbon nanowires we synthesize are as follows: Figure 4 , Figure 5 As shown. Figure 2 These are SEM images of carbon nanotubes synthesized using ZIF-67 catalysis. Figure 4 These are SEM images of carbon nanowires synthesized using ZIF-67 catalysis. The carbon nanotubes synthesized by ZIF-67 catalysis have smooth surfaces, long elongation, and grow independently as individual units. The carbon nanowires synthesized by ZIF-67 catalysis have rough surfaces, high curvature, and are prone to entanglement. Through observation... Figure 3 TEM images of carbon nanotubes synthesized by ZIF-67 in China and Figure 5TEM images of carbon nanowires synthesized using ZIF-67 catalysis reveal that both carbon nanotubes and nanowires grow around ZIF-67, ultimately forming a "fuzzy" structure. However, carbon nanotubes contain numerous cavities, while carbon nanowires are solid structures, and the intertwined growth of carbon nanowires exhibits a more complex morphology.

[0035] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0036] 1. This invention uses ZIF-67 as a catalyst precursor to synthesize a large number of carbon nanowires on the surface of carbon fiber cloth, realizing the in-situ stable synthesis of carbon nanowires on the carbon fiber surface, and providing support for the in-situ synthesis technology for the subsequent widespread application of carbon nanowires in carbon fiber reinforced composite materials.

[0037] 2. The synthesis process of this invention is simple and controllable, environmentally friendly and pollution-free, low in cost, and suitable for industrial production.

[0038] 3. The symbiotic entangled carbon nanowires synthesized in this invention have uniform size, high purity, and are uniformly dispersed on the carbon fiber surface. Attached Figure Description

[0039] Figure 1 This is a SEM image of a carbon fiber cloth with ZIF-67 on its surface;

[0040] Figure 2 These are SEM images of carbon nanotubes synthesized using ZIF-67 catalysis.

[0041] Figure 3 This is a TEM image of carbon nanotubes synthesized using ZIF-67 catalysis;

[0042] Figure 4 These are SEM images of carbon nanowires synthesized using ZIF-67 catalysis.

[0043] Figure 5 These are TEM images of carbon nanowires synthesized using ZIF-67 catalysis.

[0044] Figure 6 This is a SEM image of carbon nanowires synthesized using ZIF-67 catalysis in Example 1 of this invention;

[0045] Figure 7 This is a SEM image of the carbon nanowires synthesized by ZIF-67 catalysis in Example 2 of this invention;

[0046] Figure 8 This is a SEM image of the carbon nanowires synthesized by ZIF-67 catalysis in Example 3 of this invention;

[0047] Figure 9This is a SEM image of the carbon nanowires synthesized by ZIF-67 catalysis in Example 4 of this invention;

[0048] Figure 10 This is a SEM image of the carbon nanowires synthesized by ZIF-67 catalysis in Example 5 of this invention;

[0049] Figure 11 This is a SEM image of the carbon nanowires synthesized by ZIF-67 catalysis in Example 6 of this invention;

[0050] Figure 12 These are SEM images of carbon nanowires synthesized using ZIF-67 catalysis in the comparative example of this invention.

[0051] Figure 13 This is a flowchart of the present invention. Detailed Implementation

[0052] This invention discloses a method for catalytically synthesizing symbiotically wound carbon nanowires on the surface of carbon fiber cloth. The technical solution will be specifically illustrated through six examples.

[0053] Unlike existing carbon nanowire synthesis processes, this invention uses ZIF-67 as a catalyst precursor and optimizes the temperature of the tubular heat treatment furnace during chemical vapor deposition to synthesize a large number of symbiotically wound carbon nanowires on the surface of the deposited carbon fiber cloth.

[0054] The specific process of this embodiment is as follows:

[0055] Step 1, carbon fiber cloth pretreatment:

[0056] Carbon fiber cloth is taken according to the design requirements, ultrasonically cleaned in deionized water for 2 minutes, and then dried in a 70℃ oven for later use.

[0057] Step 2, prepare the mixed solution:

[0058] I. Preparation of cobalt nitrate solution. Using methanol as a solvent, cobalt nitrate hexahydrate powder was added to the methanol reagent and dissolved, then stirred until homogeneous to obtain a cobalt nitrate solution. The concentration of the cobalt nitrate solution was 0.04 mol / L.

[0059] In this embodiment, the cobalt nitrate hexahydrate powder is 1.164g.

[0060] II. Preparation of 2-methylimidazole solution. Using methanol as a solvent, 2-methylimidazole powder is added to methanol reagent to dissolve and stir until homogeneous, thus obtaining a 2-methylimidazole solution. The concentration of the 2-methylimidazole solution is 0.16 mol / L.

[0061] In this embodiment, the 2-methylimidazole powder is 1.3136g.

[0062] III. Preparation of the mixed solution. The obtained 2-methylimidazole solution was added to the cobalt nitrate solution and magnetically stirred for 60 seconds to obtain the mixed solution. The ratio of cobalt nitrate solution to 2-methylimidazole was 1:1, where the ratio is by volume.

[0063] Step 3, ZIF-67 is mounted on the surface of the carbon fiber cloth:

[0064] I. Synthesis of ZIF-67. A pretreated carbon fiber cloth was immersed in the mixed solution. The mixed solution containing the carbon fiber cloth was placed in a water bath at 30°C and kept at that temperature for 1 hour to allow cobalt nitrate in the mixed solution to react with 2-methylimidazole to synthesize ZIF-67, resulting in a carbon fiber cloth with ZIF-67 on its surface.

[0065] II. Washing the carbon cloth. After the water bath heating stops, remove the carbon fiber cloth with ZIF-67 coating and wash it three times with methanol reagent. Place it in a 70℃ oven to dry until ready for use.

[0066] Step 4, heating the tubular heat treatment furnace:

[0067] The carbon fibers with ZIF-67 surface coating obtained in step 3 are arranged inside the quartz tube of a tubular heat treatment furnace, and the furnace is sealed. Argon gas is continuously introduced into the tubular heat treatment furnace at a flow rate of 200 sccm as a protective atmosphere until the furnace reaches the set deposition temperature; the deposition temperature is 700℃~900℃, and the heating rate is 5℃ / min.

[0068] Step 5: Synthesis of carbon nanowires by chemical vapor deposition:

[0069] Once the temperature inside the tubular heat treatment furnace reaches the deposition temperature, chemical vapor deposition (CVD) is performed. The argon flow rate is adjusted to 500 sccm. Anhydrous ethanol is injected into the furnace at a rate of 10 mL / h using a syringe with a 30 cm long needle. Injection continues for 2 to 7.5 hours. The carbon fiber cloth is then allowed to cool to room temperature with the furnace, resulting in a dark black carbon nanowire material on the surface of the carbon fiber cloth.

[0070]

[0071]

[0072] The prepared carbon nanowires were observed using SEM, as shown in the attached figure. Figures 6-11As shown, carbon nanowires synthesized by ZIF-67 catalysis were synthesized in large quantities and uniformly dispersed on the surface of carbon fiber cloth. The diameter of the "pom-like" structure of the ZIF-67-catalyzed carbon nanowires ranged from a minimum of 1400 nm to a maximum of 5600 nm; the length of a single carbon nanowire ranged from a minimum of 300 nm to a maximum of 1900 nm. The diameter of the carbon nanowires ranged from a minimum of 30 nm to a maximum of 150 nm.

[0073] The carbon cloth with carbon nanowires on its surface obtained in this invention is laminated to prepare a carbon / carbon composite material with an interlaminar shear strength of 19.58–23.78 MPa, which is 61.8–96.5% higher than that of carbon / carbon composite materials with pure carbon cloth laminates.

[0074] Table 2 Technical features of carbon nanowires obtained in each embodiment

[0075]

[0076] Comparative Example

[0077] The specific process of this comparative example is the same as that of the present invention. In step 4 of this comparative example, the deposition temperature of the tubular heat treatment furnace is 600°C.

[0078] The SEM image of the carbon nanowires obtained in this comparative example is shown below. Figure 12 As shown, under the same preparation process but with a lower temperature in the tubular heat treatment furnace, ZIF-67 did not successfully catalyze the synthesis of carbon nanowires. ZIF-67 retained its original structure with a size of approximately 1000–1500 nm.

Claims

1. A method for catalytic synthesis of carbon nanowires on the surface of carbon fiber cloth, characterized in that, The specific process is as follows: Step 1, carbon fiber cloth pretreatment: Step 2, prepare the mixed solution: The mixed solution was prepared by mixing cobalt nitrate solution and 2-methylimidazole solution; The cobalt nitrate solution is prepared by dissolving cobalt nitrate hexahydrate powder in methanol and stirring until homogeneous, using methanol as the solvent; the concentration of the cobalt nitrate solution is 0.04 mol / L. The 2-methylimidazole solution is prepared by dissolving 2-methylimidazole powder in methanol and stirring until homogeneous, using methanol as the solvent; the concentration of the 2-methylimidazole solution is 0.16 mol / L. Step 3, ZIF-67 is mounted on the surface of the carbon fiber cloth: The specific process is as follows: I. Synthesis of ZIF-67: Carbon fiber cloth is immersed in the mixed solution and placed in a water bath at 30°C for 1 hour to allow cobalt nitrate in the mixed solution to react with 2-methylimidazole to synthesize ZIF-67; carbon fiber cloth with ZIF-67 on its surface is obtained. II. Washing the carbon cloth; Take out the carbon fiber cloth with ZIF-67 on the surface, wash it three times with methanol reagent; place it in a 70℃ oven to dry and set aside for use; Step 4, heating the tubular heat treatment furnace: The temperature of the tubular heat treatment furnace is the deposition temperature; the deposition temperature is 700℃~900℃. Step 5: Synthesis of carbon nanowires by chemical vapor deposition: When the temperature inside the tubular heat treatment furnace rises to the deposition temperature, chemical vapor deposition is performed; the argon flow rate is adjusted to 500 sccm; anhydrous ethanol reagent is injected into the furnace at a rate of 10 mL / h; the injection continues for 2 h to 7.5 h; the carbon fiber cloth is cooled to room temperature with the furnace, and carbon nanowire materials are obtained on the surface of the carbon fiber cloth.

2. The method for catalytic synthesis of carbon nanowires on the surface of carbon fiber cloth as described in claim 1, characterized in that, To prepare the mixed solution, cobalt nitrate solution and 2-methylimidazole in a volume ratio of 1:1 are mixed and magnetically stirred for 60 seconds to obtain the mixed solution.

3. The method for catalytic synthesis of carbon nanowires on the surface of carbon fiber cloth as described in claim 1, characterized in that, When the tubular heat treatment furnace is heated, argon gas is continuously introduced into the tubular heat treatment furnace at a flow rate of 200 sccm until the tubular heat treatment furnace is heated to the set deposition temperature; the heating rate is 5℃ / min.

4. The method for catalytic synthesis of carbon nanowires on the surface of carbon fiber cloth as described in claim 1, characterized in that, The carbon nanowire material on the surface of the carbon fiber cloth is dark black.

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