Growth of Single-Walled Carbon Nanotubes from Nonmagnetic Catalysts by Plasma Chemical Vapor Deposition

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概要

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• Single-walled carbon nanotubes (SWNTs) are firstly grown from nonmagnetic catalysts such as Au, Pt, and Ag by plasma chemical vapor deposition (PCVD). Through the systematical investigation of the SWNT growth by thermal CVD (TCVD) and PCVD utilizing nonmagnetic and magnetic catalysts, it was revealed that an obviously opposite dependence of the SWNT yield on the H2 concentration exists between the growth experiments with the magnetic and nonmagnetic catalysts. This unique feature is explained by the difference of adsorption efficiency of hydrocarbon materials on the surface of catalysts. Optical emission spectra were also measured during the growth of SWNTs by PCVD. It was found that the intensity ratio of CH/Hα shows a tendency similar to the intensity ratio of G- and D-band ($I_{\text{G}}/I_{\text{D}}$) of SWNTs as a function of H2 concentration. This indicates the CH/Hα can be available to optimize the growth condition of SWNTs by PCVD, especially for nonmagnetic catalysts, whose catalytic activity is much more sensitive to the etching element than magnetic catalysts.

• 2010-02-25

著者

• Kato Toshiaki

  Department Of Applied Chemistry School Of Engineering Tokai University

• Kaneko Toshiro

  Department Of Electronic Engineering Tohoku University

• Toshiro Kaneko

  Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan

• Ghorannevis Zohreh

  Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan

• Rikizo Hatakeyama

  Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan

• Zohreh Ghorannevis

  Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan

• Toshiaki Kato

  Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan

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