Carbon letters
- Volume 5 Issue 3
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- Pages.133-141
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- 2004
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- 1976-4251(pISSN)
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- 2233-4998(eISSN)
Synthetic Properties of Fe/MgO Catalyst on Characteristics of Carbon Nanotubes Prepared by Catalytic Chemical Vapor Deposition
- Jung, Sung-Sil (Department of Metallurgical Engineering, Pusan National University) ;
- Lee, Dae-Yeol (Carbon Nano-material Technology Co., LTD.) ;
- Chung, Won-Sub (Department of Metallurgical Engineering, Pusan National University) ;
- Park, Ik-Min (Department of Metallurgical Engineering, Pusan National University)
- Received : 2004.08.05
- Accepted : 2004.09.08
- Published : 2004.09.30
Abstract
The synthetic behaviors of carbon nanotubes (CNTs) by Fe/MgO catalysts were investigated in 0~90 wt.% range of MgO mixture ratios by catalytic chemical vapor deposition (CCVD) process. The CNTs were synthesized with 40 minutes of synthetic time, and 923 K of synthetic temperature using 0.1 L/min of ethylene gas and 1.0 L/min of hydrogen gas as synthetic and carrier gas, respectively. As the increase of synthetic temperatures and times, the diameters of CNTs become thicker. The carbon yield showed in a parabolic curve as MgO content increased and the maximum carbon yield was obtained at 30 wt.% of MgO. There were no obvious changes in the diameters of CNTs respect to the change of MgO content. Fe/MgO CNTs showed good crystalinity by High Resolution Transmission Electron microscope (HR-TEM) analysis. The behaviors of Fe/MgO CNTs have a tendency of depending on synthetic time and temperature rather than MgO content.