CN109226740B - Iridium nano particle and application thereof in catalytic growth of carbon nano tube - Google Patents

Iridium nano particle and application thereof in catalytic growth of carbon nano tube Download PDF

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CN109226740B
CN109226740B CN201811158486.6A CN201811158486A CN109226740B CN 109226740 B CN109226740 B CN 109226740B CN 201811158486 A CN201811158486 A CN 201811158486A CN 109226740 B CN109226740 B CN 109226740B
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iridium
solution
prepared
carbon
inert gas
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CN109226740A (en
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何茂帅
薛晗
辛本武
王灏珉
武倩汝
高文珂
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Qingdao Hailiwei Nanotechnology Co ltd
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Qingdao University of Science and Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/46—Ruthenium, rhodium, osmium or iridium
    • B01J23/468—Iridium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/05—Metallic powder characterised by the size or surface area of the particles
    • B22F1/054—Nanosized particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/02—Pretreatment of the material to be coated
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/26—Deposition of carbon only

Abstract

The invention provides an iridium nano particle and application thereof in catalytic growth of a carbon nano tube. The invention discloses an iridium nanoparticle with a high melting point, and a preparation method of the iridium nanoparticle comprises the following steps: s1, slowly adding alkali liquor into an iridium salt solution, strongly stirring and ultrasonically vibrating to obtain a dark brown solution; s2, performing microwave treatment on the dark brown solution prepared in the step S1 to obtain a solution containing the iridium nanoparticles. The iridium nano particles prepared by the method are used as a catalyst of the carbon nano tube, and the carbon nano tube prepared by the chemical vapor deposition method has the advantages of uniform growth, controllable structure and the like, so the iridium nano particles have good industrial application prospect.

Description

Iridium nano particle and application thereof in catalytic growth of carbon nano tube
Technical Field
The invention belongs to the technical field of preparation of carbon nanotube catalysts, and particularly relates to iridium nanoparticles and application thereof in catalytic growth of carbon nanotubes.
Background
Due to the excellent physical and chemical properties of the carbon nano tube, the carbon nano tube has a plurality of potential application values in the fields of energy, catalysis, environment and electronics. Different carbon nanotubes have different structures and helical angles and thus exhibit different electrical and optical properties. For example, some structures of single-walled carbon nanotubes exhibit metallic properties, while other structures of carbon nanotubes exhibit semiconducting properties. The diversity of the carbon nanotube structure expands the application range to a certain extent, and simultaneously inevitably brings a lot of difficulties for promoting the practical application of the carbon nanotube structure. The methods for structural separation of carbon tubes have been a long-standing development over the last decade. However, these separation methods often rely on complicated physicochemical processes, inevitably affect the structural integrity and intrinsic properties of the carbon nanotubes, are costly, and are not favorable for the application and research of the carbon nanotubes in integrated circuits. Therefore, how to directly prepare the carbon nanotube with a controllable structure is a key point and a difficulty in the current carbon tube preparation field.
The chemical vapor deposition method is a main method for preparing the carbon nano tube at present due to the advantages of low cost, high controllability and the like. The catalyst plays a crucial role in the growth process of carbon tubes, because the surface structure of the catalyst determines the nucleation thermodynamics of carbon nanotubes. For a catalyst with a specific component, the unique surface structure determines the structural distribution of the carbon nanotubes which are catalytically grown. Therefore, to prepare carbon nanotubes of a specific structure, it is necessary to prepare catalyst nanoparticles having a uniform composition and structure. The metal nano particles prepared by the microwave reduction method have uniform size and consistent structure, and are an important method for providing an excellent catalyst for growing the carbon nano tubes.
The catalyst for traditional carbon tube growth is mainly nano particles containing iron, cobalt and nickel, and then a series of noble metal nano particles and non-metal nano particles are developed to catalyze and grow carbon nano tubes. However, most of the catalyst nanoparticles are liquid at normal reaction temperature, which is not favorable for controlling the structure of the carbon nanotube. Therefore, it is necessary to develop a new catalyst for growing carbon nanotubes so as to achieve precise control of the structure of the carbon nanotubes.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an iridium nanoparticle and application thereof in catalytic growth of a carbon nanotube. The iridium nano particles with high melting point are prepared by the invention and used as the carbon nano tube catalyst, and the carbon nano tube prepared by adopting the chemical vapor deposition method has the advantages of uniform growth, controllable structure and the like, thereby having good industrial application prospect.
One of the purposes of the invention is to provide a preparation method of iridium nanoparticles.
The second purpose of the present invention is to provide iridium nanoparticles prepared by the above method.
The invention also aims to provide application of the iridium nanoparticles.
The fourth purpose of the invention is to provide a method for preparing carbon nano-tubes by taking iridium nano-particles as a catalyst.
In order to achieve the purpose, the invention relates to the following technical scheme:
in a first aspect of the present invention, there is provided a method for preparing iridium nanoparticles, the method comprising:
s1, slowly adding alkali liquor into an iridium salt solution, strongly stirring and ultrasonically vibrating to obtain a dark brown solution;
s2, performing microwave treatment on the dark brown solution prepared in the step S1 to obtain a solution containing the iridium nanoparticles.
Preferably, in the step S1,
the concentration of the alkali liquor is 0.1-0.3 mol/L (preferably 0.2 mol/L);
preferably, the alkali liquor is prepared by dissolving sodium hydroxide in an organic solvent, and the organic solvent is further preferably ethylene glycol;
preferably, in the iridium salt solution, the iridium salt includes, but is not limited to, iridium chloride, iridium sulfate, iridium nitrate, iridium carbonate; further preferred is iridium chloride; the solvent is an organic solvent, and preferably ethylene glycol;
more preferably, the iridium salt solution preparation method comprises the following steps: dissolving iridium chloride trihydrate and polyvinylpyrrolidone in ethylene glycol, and stirring and performing ultrasonic treatment to obtain the iridium chloride trihydrate and polyvinylpyrrolidone;
wherein the polyvinylpyrrolidone has a Mw of 40,000.
Preferably, in the step S2,
the microwave treatment condition is 2400-2500 MHz (preferably 2450MHz), and the microwave treatment time is 1-3 min (preferably 2 min).
In a second aspect of the present invention, the iridium nanoparticles prepared by the above method are provided. The iridium nanoparticles are uniform in particle size, and the average particle size is 2-4 nm.
In a third aspect of the present invention, there is provided an application of the iridium nanoparticles as a catalyst in the preparation of carbon nanotubes.
In a fourth aspect of the present invention, a method for preparing carbon nanotubes is provided, wherein the method comprises using iridium nanoparticles as a catalyst and using a chemical vapor deposition method to prepare carbon nanotubes.
Specifically, the method comprises the following steps:
s1, coating an iridium nanoparticle solution on the surface of a silicon dioxide sheet, and heating to remove surface impurities;
s2, heating the silicon dioxide sheet processed in the step S1 in an inert gas atmosphere, introducing carbon monoxide, performing chemical vapor deposition, and cooling to obtain the silicon dioxide sheet.
Wherein the inert gas is preferably argon, and the ventilation volume is 200-400 cm3Min (preferably 300 cm)3Min); the temperature rise temperature is controlled to be 950 ℃ and 1050 ℃;
the chemical vapor deposition time is controlled to be 0.5-1.5 h (preferably 1h), and inert gas is not introduced during the period.
The invention has the beneficial effects that:
the invention successfully prepares the nanometer iridium particles for the first time, and directly uses the single nanometer iridium particles as the catalyst to prepare the carbon nano tube. The iridium nano particles have higher melting point, and the carbon nano tubes prepared by using the iridium nano particles as the carbon nano tube catalyst by the chemical vapor deposition method have the advantages of uniform growth, controllable structure and the like, and the diameter of the carbon tubes is equivalent to that of the nano iridium particle catalyst, so the iridium nano particles have good industrial application prospect.
Drawings
FIG. 1 is a transmission electron micrograph of iridium nanoparticles prepared in example 1;
fig. 2 is an atomic force microscope characterization diagram of the carbon nanotubes prepared in example 4.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As mentioned above, the catalyst nanoparticles are in liquid state at normal reaction temperature, which is not favorable for controlling the structure of the carbon nanotube. Therefore, it is necessary to develop a new catalyst for growing carbon nanotubes so as to achieve precise control of the structure of the carbon nanotubes.
In view of the above, in an exemplary embodiment of the present invention, there is provided a method for preparing iridium nanoparticles, the method including:
s1, slowly adding alkali liquor into an iridium salt solution, strongly stirring and ultrasonically vibrating to obtain a dark brown solution;
s2, performing microwave treatment on the dark brown solution prepared in the step S1 to obtain a solution containing the iridium nanoparticles.
Preferably, in the step S1,
the concentration of the alkali liquor is 0.1-0.3 mol/L (preferably 0.2 mol/L);
in another embodiment of the present invention, the alkali solution is prepared by dissolving sodium hydroxide in an organic solvent, and the organic solvent is further preferably ethylene glycol;
in yet another embodiment of the present invention, in the iridium salt solution, the iridium salt includes, but is not limited to, iridium chloride, iridium sulfate, iridium nitrate, iridium carbonate; further preferred is iridium chloride; the solvent is an organic solvent, and preferably ethylene glycol;
in still another embodiment of the present invention, the iridium salt solution is prepared by: dissolving iridium chloride trihydrate and polyvinylpyrrolidone in ethylene glycol, and stirring and performing ultrasonic treatment to obtain the iridium chloride trihydrate and polyvinylpyrrolidone;
wherein the polyvinylpyrrolidone has a Mw of 40,000.
In another embodiment of the present invention, in step S2,
the microwave treatment condition is 2400-2500 MHz (preferably 2450MHz), and the microwave treatment time is 1-3 min (preferably 2 min).
In another embodiment of the present invention, the iridium nanoparticles prepared by the above method are provided. The iridium nanoparticles are uniform in particle size, and the average particle size is 2-4 nm. The iridium nano particles prepared by the microwave reduction method have uniform size and consistent structure, and are excellent catalysts for preparing carbon nano tubes.
In another embodiment of the present invention, there is provided a method for preparing carbon nanotubes, which comprises the steps of preparing carbon nanotubes from the iridium nanoparticles.
In another embodiment of the present invention, a method for preparing carbon nanotubes is provided, which comprises using iridium nanoparticles as a catalyst and using a chemical vapor deposition method to prepare carbon nanotubes.
Specifically, the method comprises the following steps:
s1, coating an iridium nanoparticle solution on the surface of a silicon dioxide sheet, and heating to remove surface impurities;
s2, heating the silicon dioxide sheet processed in the step S1 in an inert gas atmosphere, introducing carbon monoxide, performing chemical vapor deposition, and cooling to obtain the silicon dioxide sheet.
Wherein the inert gas is preferably argon, and the ventilation volume is 200-400 cm3Min (preferably 300 cm)3Min); the temperature rise temperature is controlled to be 950 ℃ and 1050 ℃;
the chemical vapor deposition time is controlled to be 0.5-1.5 h (preferably 1h), and inert gas is not introduced during the period.
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The test methods in the following examples, which are not specified under specific conditions, are generally carried out under conventional conditions.
Example 1 preparation of Iridium nanoparticles
(1) Dissolving 0.04g of sodium hydroxide in 5ml of ethylene glycol, and performing ultrasonic oscillation for 30min to prepare a sodium hydroxide solution with the concentration of 0.2mol/L as a reducing agent;
(2) 0.00176g of iridium chloride trihydrate and 0.0287g of polyvinylpyrrolidone (Mw 40,000) were dissolved in 4.8ml of ethylene glycol, stirred for 5min and then sonicated for 10 min;
(3) slowly dripping 0.2ml of sodium hydroxide solution into the solution, strongly stirring the solution in the dripping process, and then ultrasonically shaking the solution for 10min to obtain light brown solution;
(4) placing the above solution in microwave oven (2450MHz, WP700), microwave for 2min to turn the solution into dark brown, and cooling for use.
FIG. 1 is a TEM image of the prepared iridium nanoparticles, and it can be seen that the iridium nanoparticles are uniform in size and uniform in distribution, and the average particle size is 2-4 nm.
Example 2 preparation of Iridium nanoparticles
(1) Dissolving 0.02g of sodium hydroxide in 5ml of ethylene glycol, and performing ultrasonic oscillation for 20min to prepare a sodium hydroxide solution with the concentration of 0.1mol/L as a reducing agent;
(2) 0.00176g of iridium chloride trihydrate and 0.0287g of polyvinylpyrrolidone (Mw 40,000) were dissolved in 4.8ml of ethylene glycol, stirred for 5min and then sonicated for 10 min;
(3) slowly dripping 0.2ml of sodium hydroxide solution into the solution, strongly stirring the solution in the dripping process, and then ultrasonically shaking the solution for 10min to obtain light brown solution;
(4) placing the above solution in microwave oven (2450MHz, WP700), microwave for 2min to turn the solution into dark brown, and cooling for use.
Example 3 preparation of Iridium nanoparticles
(1) Dissolving 0.06g of sodium hydroxide in 5ml of ethylene glycol, and performing ultrasonic oscillation for 30min to prepare a sodium hydroxide solution with the concentration of 0.3mol/L as a reducing agent;
(2) 0.00176g of iridium chloride trihydrate and 0.0287g of polyvinylpyrrolidone (Mw 40,000) were dissolved in 4.8ml of ethylene glycol, stirred for 5min and then sonicated for 10 min;
(3) slowly dripping 0.2ml of sodium hydroxide solution into the solution, strongly stirring the solution in the dripping process, and then ultrasonically shaking the solution for 10min to obtain light brown solution;
(4) placing the above solution in microwave oven (2450MHz, WP700), microwave for 2min to turn the solution into dark brown, and cooling for use.
EXAMPLE 4 preparation of carbon nanotubes
(1) Spin-coating the iridium nanoparticle solution prepared in example 1 on the surface of the treated silica plate, and then heating the silica plate in the air at 600 ℃ to remove organic substances attached to the surface;
(2) the silica plate with the iridium catalyst attached thereto was placed in a chemical vapor deposition reaction furnace under an inert gas (argon gas, 300 cm)3Min) heating to 950 ℃ under protection;
(3) after the reaction temperature was raised, carbon monoxide (300 cm) was added3Min) introducing the mixture into a reaction chamber, keeping the temperature unchanged, turning off inert gas, and reacting for 1.2 hours;
(4) and (4) introducing inert gas again, closing carbon monoxide, and cooling to room temperature under the protection of the inert gas.
Fig. 2 is an AFM image of the prepared carbon nanotube, and it can be seen that the carbon nanotube has a uniform thickness and a stable structure.
EXAMPLE 5 preparation of carbon nanotubes
(1) Spin-coating the iridium nanoparticle solution prepared in example 2 on the surface of the treated silica plate, and then heating the silica plate in the air at 600 ℃ to remove organic substances attached to the surface;
(2) the silica plate with the iridium catalyst attached thereto was placed in a chemical vapor deposition reaction furnace under an inert gas (argon gas, 200 cm)3Min) heating to 1000 deg.C under protection;
(3) after the reaction temperature had been raised, carbon monoxide (200 cm) was added3Min) introducing the mixture into a reaction chamber, keeping the temperature unchanged, turning off inert gas, and reacting for 1 hour;
(4) and (4) introducing inert gas again, closing carbon monoxide, and cooling to room temperature under the protection of the inert gas.
Example 6 method for preparing carbon nanotubes:
(1) spin coating the iridium nanoparticle solution prepared in example 3 on the surface of the treated silica plate, and then heating the silica plate in the air at 700 ℃ to remove organic substances attached to the surface;
(2) the silica plate with the iridium catalyst attached thereto was placed in a chemical vapor deposition reaction furnace under an inert gas (argon gas, 300 cm)3Min) heating to 1050 deg.C under protection;
(3) after the reaction temperature was raised, carbon monoxide (300 cm) was added3Min) introducing the mixture into a reaction chamber, keeping the temperature unchanged, turning off inert gas, and reacting for 1 hour;
(4) and (4) introducing inert gas again, closing carbon monoxide, and cooling to room temperature under the protection of the inert gas.
It should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples given, those skilled in the art can modify the technical solution of the present invention as needed or equivalent substitutions without departing from the spirit and scope of the technical solution of the present invention.

Claims (8)

1. A method for producing a carbon nanotube, comprising:
s1, coating an iridium nanoparticle solution on the surface of a silicon dioxide sheet, and heating to remove surface impurities;
s2, heating the silicon dioxide sheet treated in the step S1 in an inert gas atmosphere, introducing carbon monoxide, performing chemical vapor deposition, and cooling to obtain the silicon dioxide sheet;
the temperature rise temperature is controlled to be 950 ℃ and 1050 ℃;
controlling the chemical vapor deposition time to be 0.5-1.5 h, and not introducing inert gas in the period;
the preparation method of the iridium nanoparticle solution comprises the following steps:
s1, slowly adding alkali liquor into an iridium salt solution, strongly stirring and ultrasonically vibrating to obtain a dark brown solution;
the alkali liquor is prepared by dissolving sodium hydroxide in ethylene glycol, the concentration of the alkali liquor is 0.1-0.3 mol/L, and the preparation method of the iridium salt solution comprises the following steps: dissolving iridium chloride trihydrate and polyvinylpyrrolidone in ethylene glycol, and stirring and performing ultrasonic treatment to obtain the iridium chloride trihydrate and polyvinylpyrrolidone; in the iridium salt solution, the iridium salt comprises iridium chloride, iridium sulfate, iridium nitrate and iridium carbonate;
s2, performing microwave treatment on the dark brown solution prepared in the step S1 to obtain a solution containing iridium nanoparticles; the microwave treatment condition is 2400-2500 MHz, and the microwave treatment lasts for 1-3 min.
2. The method of claim 1, wherein in step S1, the alkali solution concentration is 0.2 mol/L.
3. The method of claim 1, wherein the iridium salt in the iridium salt solution is iridium chloride.
4. The method of claim 1, wherein the polyvinylpyrrolidone has a Mw of 40,000.
5. The method of claim 1, wherein in step S2, the microwave treatment is 2450MHz for 2 min.
6. The method of claim 1, wherein the inert gas is argon and the ventilation rate is 200-400 cm3/min。
7. The method of claim 6, wherein the ventilation rate is 300cm3And/min, and controlling the chemical vapor deposition time to be 1 h.
8. Carbon nanotubes produced by the method of any one of claims 1 to 7.
CN201811158486.6A 2018-09-30 2018-09-30 Iridium nano particle and application thereof in catalytic growth of carbon nano tube Active CN109226740B (en)

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