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Method for the preparation of high purity carbon nanotubes using water

A carbon nanotube, high-purity technology, applied in the direction of carbon nanotubes, nanocarbon, nanotechnology, etc., can solve the problems of reduced total yield of carbon nanotubes, affecting the preparation of carbon nanotubes, complicated reactions, etc., to achieve the suppression of soot Formation, reduced soot formation, easy to obtain effect

Inactive Publication Date: 2006-12-27
KH CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, these methods have many problems: because the reactivity of the reaction gas used to suppress soot formation is so high that the overall yield of carbon nanotubes is significantly reduced; the added gas complicates the reaction and affects the preparation of carbon nanotubes ;and many more

Method used

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  • Method for the preparation of high purity carbon nanotubes using water
  • Method for the preparation of high purity carbon nanotubes using water
  • Method for the preparation of high purity carbon nanotubes using water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] (a) Preparation of catalyst: use Fe(NO 3 ) 2 and Co(NO 3 ) 2 impregnated in an aqueous solution, and then calcined at 300 °C under atmospheric pressure. The catalyst obtained contained 5% by weight each of iron and cobalt.

[0072] (b) Preparation of carbon nanotubes: 0.2 g of alumina catalyst co-impregnated with iron and cobalt prepared in (a) was added to a quartz boat, and then placed in a quartz tube reactor (27 mm in diameter) located in an electric furnace )center of. Then, the temperature of the reactor was raised to 1000° C. with the flow of helium gas at a rate of 100 ml / min. When the temperature of the reactor reached 1000° C., 2 vol % of benzene and 10 vol % of water respectively vaporized from helium were injected into the reactor, followed by carbon nanotube synthesis for 30 minutes.

[0073] By analyzing the obtained product using a scanning electron microscope (SEM), the presence of carbon nanotubes mixed with about 20% of soot as an impurity was co...

Embodiment 2

[0075] An emulsion in which benzene nanoparticles were uniformly distributed was prepared by dissolving 5 g of cetyltrimethylammonium bromide (CTAB) in 100 ml of water, after which it was mixed with 10 ml of benzene. 0.2 g of the catalyst prepared in Example 1 was added into a quartz boat, which was then placed in the center of a quartz tube reactor with a diameter of 27 mm. Then, the temperature of the reactor was raised to 1000° C. with the flow of helium gas at a rate of 100 ml / min. When the reactor temperature reached 1000° C., carbon nanotube synthesis was performed for 30 minutes by injecting the benzene emulsion (prepared in the above method) into the reactor at a rate of 0.34 ml / min.

[0076] According to the result of analyzing the obtained product using SEM, it was found that the soot formation was relatively reduced compared with Example 1, but according to the result of analyzing the obtained product using a transmission electron microscope (TEM), it was found that...

Embodiment 3

[0078] Embodiment 3 (comparative example)

[0079] In order to examine the role of water in the preparation of high-purity carbon nanotubes, carbon nanotubes were synthesized by using the same catalyst as in Example 1 under the same reaction conditions. In this example, instead of injecting water, benzene was vaporized to 2% by volume with helium and then injected into the reactor. The reaction was carried out at 1000°C for 30 minutes.

[0080] According to the results of analyzing the obtained product using SEM, it was found that a large number of soot particles coexisted with the carbon nanotubes. Furthermore, according to the results of analyzing the obtained product using TEM, it was found that the average diameter of the carbon nanotubes was about 1.2 nm.

[0081] image 3 is a scanning electron microscope (SEM) image of the carbon nanotubes prepared in Example 3.

[0082] SEM images of carbon nanotubes synthesized by water injection ( figure 1 and figure 2 ), no s...

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Abstract

The present invention provides a method for preparing high purity carbon nanotubes, in which, when carbon nanotubes are prepared by the recombination of carbons generated from a carbon source in the presence or absence of a catalyst as in arc-discharge, laser ablation, chemical vapor deposition or vapor phase continuous growth method, and the like, water of 1 to 2000 wt% based on a carbon source is added in the reaction system to prepare high purity carbon nanotubes. According to the present invention, the addition of water in the reaction system suppresses the soot formation resulting from the pyrolysis of a carbon source itself and induces the oxidation or reduction of the formed soot by water, and thereby high purity carbon nanotubes can be prepared economically and easily.

Description

technical field [0001] The present invention relates to a method for preparing high-purity carbon nanotubes by using water. More specifically, the present invention relates to a method for producing high-purity carbon nanotubes, wherein carbon nanotubes are produced by recombining carbon produced from solid carbon or a carbon source such as hydrocarbons in the presence or absence of a catalyst. When using the carbon nanotubes, water is added to the reaction system in order to suppress the formation of soot caused by the pyrolysis of the carbon source itself, and water is used to stimulate the oxidation or reduction reaction of the generated soot, thereby preparing high-purity carbon nanotubes. Background technique [0002] Since the Japanese scientist Dr. Iijima discovered the structure of carbon nanotubes in 1991, he has been actively researching the synthesis, properties and applications of carbon nanotubes until now. Carbon nanotubes (CNTs) exist in the form of graphite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00C01B31/02
CPCC01B2202/30C01B2202/36B82Y40/00C01B31/0233B82Y30/00C01B32/162B82B3/00
Inventor 金永南
Owner KH CHEM CO LTD
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