Method of preparing catalyst for manufacturing carbon nanotubes

a carbon nanotube and catalyst technology, applied in the field of preparing a catalyst for manufacturing carbon nanotubes, can solve the problems of difficult control of the diameter and the length of the carbon nanotube, low carbon nanotube yield of arc discharge and laser deposition, and complicated purification process. achieve the effect of improving uniformity and increasing uniformity

Inactive Publication Date: 2007-01-25
SAMSUNG SDI CO LTD
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Benefits of technology

[0013] It is a further object of the present invention to provide a novel method of forming catalyst particles with increased uniformity, on which carbon nano...

Problems solved by technology

The arc discharge and the laser deposition have relatively low yields of carbon nanotubes.
When using the arc discharge and the laser deposition, It is difficult to control the diameter and the length of the carbon nanotube.
Further, in the arc discharge and the laser deposition, clusters of amorphous carbon besides the carbon nanotubes are produced in a large amount, and thus a complicated purifying process must be performed.
However, in this case, recrystallization and agglomeration o...

Method used

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  • Method of preparing catalyst for manufacturing carbon nanotubes
  • Method of preparing catalyst for manufacturing carbon nanotubes
  • Method of preparing catalyst for manufacturing carbon nanotubes

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[0057] A 40 mM iron acetate solution was prepared using ethanol and ethylene glycol as a solvent. 20 mL of ethanol and 20 mL of ethylene glycol were added to 0.1 g of iron acetate powder to obtain a solution having a proper viscosity. A silicon substrate with a diameter of 20.32 cm was dipped in the obtained solution. The coated substrate was cooled immediately with liquid nitrogen and then transferred into a vacuum chamber. Then, a vacuum less than 0.1 mmHg was applied to the chamber in order to evaporate the solvent. To minimize an amount of the remained solvent, the substrate was further heated at 100° C.

[0058] The freeze-dried substrate was heat-treated at 300° C. for 10 minutes in order to oxidize the iron acetate. Then, the substrate was subjected to a reduction treatment with hydrogen at 600° C.

[0059] As a result, the iron particles were uniformly formed on the substrate. FIG. 1 is an electron microscopic image of iron particles formed on the silicon substrate according to ...

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Abstract

A novel method of forming catalyst particles, on which carbon nanotubes grow based, on a substrate with increased uniformity, and a method of synthesizing carbon nanotubes having improved uniformity are provided. A catalytic metal precursor solution is applied to a substrate. The applied catalytic metal precursor solution is freeze-dried, and then reduced to catalytic metal. The method of forming catalyst particles can minimize agglomeration and/or recrystallization of catalyst particles when forming the catalyst particles by freeze-drying the catalyst metal precursor solution. The catalyst particles formed by the method has a very uniform particle size and are very uniformly distributed on the substrate.

Description

CLAIM OF PRIORITY [0001] This application claims the priority of Korean Patent Application No. 10-2004-0046552, filed on Jun. 22, 2004, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a method of preparing a catalyst for manufacturing carbon nanotubes and a method of manufacturing carbon nanotubes using the same. [0004] 2. Description of the Related Art [0005] A carbon nanotube has a cylindrical structure having a diameter of several nano-meter and a very large aspect ratio of about 10 to 1,000. In the carbon nanotube, carbon atoms are generally arranged in a hexagonal honeycomb pattern. One carbon atom bonds to three adjacent carbon atoms. The carbon nanotube may be a conductor or a semiconductor according to its structure. As a conductor, the carbon nanotube has high electroconductivity. Also, the carbon nanot...

Claims

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Application Information

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IPC IPC(8): D01F9/12B82B3/00
CPCD01F9/12B82Y30/00B82B3/00B82Y99/00
Inventor HAN, IN-TAEKKIM, HA-JIN
Owner SAMSUNG SDI CO LTD
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