Mechanism on Growth of Carbon Nanotubes Using CO-H2 Gas Mixture

Abstract:

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To investigate the catalytic mechanism for the growth of carbon nanotubes (CNTs), carbon materials was synthesized at 680°C with a gas mixture of CO-H2 after reduction at 800°C by H2 gas. The synthesized carbon materials on reduced metallic surface were comprehensively explored by scanning electron microscopy (SEM) and X-ray diffraction patterns (XRD) at various reaction times of 2, 10, 70, and 150 min, respectively. The carbon materials synthesized by metal Pt were little affected by reaction time, and only the sintered particles were observed without formation of CNTs. From X-ray analysis, iron oxides synthesized for 2 min were completely converted to iron carbide (Fe3C) without Fe peaks. After 5 min, iron carbide (Fe3C) and carbon (C) phases were observed at the beginning of CNTs growth. It was found that the intensity of carbon(C) peak was gradually increased with the continuous growth of CNTs as reaction time increases. The carbon materials synthesized from the metal Pt were amorphous. It was also found that a catalyst on growth of CNTs was metal carbide.

Info:

Periodical:

Materials Science Forum (Volumes 475-479)

Main Theme:

Edited by:

Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie

Pages:

3551-3554

DOI:

10.4028/www.scientific.net/MSF.475-479.3551

Citation:

U. C. Chung and W. S. Chung, "Mechanism on Growth of Carbon Nanotubes Using CO-H2 Gas Mixture", Materials Science Forum, Vols. 475-479, pp. 3551-3554, 2005

Online since:

January 2005

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$35.00

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