Method for synthesizing carbon nanotubes
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EXAMPLE
[0079] 0.86 g of ferrous chloride (FeCl2) and 2.35 g of ferric chloride (FeCl3) are dissolved in 40 ml of water, and then heated to 80° C. with stirring, to give an aqueous iron chloride solution 13. 5 ml of ammonium chloride (NH4OH) is added dropwise to the aqueous iron chloride solution 13 and left to stand for 5 minutes, to produce black magnetite (Fe3O4) powders. The produced magnetite powders are placed on a rotating plate 21 by an injector 20, and uniformly coated on a silicon substrate 22 by torque.
[0080] 5.5 g of fatty acid CH3(CH2)8CO2H as a surfactant is added to the aqueous iron chloride solution 13. In order to allow the catalytic metal to be uniformly coated, the surfactant is added in such a manner that 0.5 g of the first portion dissolved in 25 ml of acetone is added and then 1 g of each of the remaining five portions, which were dissolved in 50 ml of acetone, respectively, is added. This fatty acid addition technology for allowing the catalytic metal to be u...
Example
Comparative Example 1
[0090] A catalytic metal, which is necessarily required for the synthesis of carbon nanotubes on the catalytic metal deposited by the prior thin film deposition process, was deposited to a thickness of 60 nm using a sputter thin-film deposition equipment, and the synthesis of carbon nanotubes on the deposited catalytic metal was attempted. FIG. 7a is a SEM photograph (5.0 kV, 12.1 mm×400, 100 μm) showing the carbon nanotubes grown on the Fe thin film deposited by the thin film deposition process according to Comparative Example 1; FIG. 7b is a SEM photograph (5.0 kV, 12.7 mm×1.00 k, 50 μm) showing the carbon nanotubes grown on the Fe thin film deposited by the thin film deposition process according to Comparative Example 1; FIG. 7c is a SEM photograph (5.0 kV, 11.0 mm×2.00 k, 20.0 μm) showing the carbon nanotubes grown on the Fe thin film deposited by the thin film deposition process according to Comparative Example 1; and FIG. 7d is a SEM photograph (5.0 kV, 1...
Example
Comparative Example 2
[0091] Ni particles with a diameter of about 20 nm were purchased and coated on a silicon substrate, and then the synthesis of carbon nanotubes was attempted. FIG. 8a is a SEM photograph (5.0 kV, 12.8 mm×1.00 k, 50.0 μm) showing the carbon nanotubes grown on the nanosize Ni particles according to Comparative Example 2; FIG. 8b is a SEM photograph (5.0 kV, 12.9 mm×1.00 k, 50.0 μm) showing the carbon nanotubes grown on the nanosize Ni particles according to Comparative Example 2; and FIG. 8c is a SEM photograph (5.0 kV, 12.9 mm×3.00 k, 10.0 μm) showing the carbon nanotubes grown on the nanosize Ni particles according to Comparative Example 2.
[0092] In order to examine the structural characteristics of the carbon nanotubes synthesized by Example of the present invention, transmission electron microscopy (TEM) was performed. FIG. 9a is a TEM photograph showing the results of transmission electron microscopy for the carbon nanotubes grown according to Example of th...
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