Growth of single-walled carbon nanotubes from nonmagnetic catalysts by plasma chemical vapor deposition

Zohreh Ghorannevis, Toshiaki Kato, Toshiro Kaneko, Rikizo Hatakeyama

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

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 (IG/ID) 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.

Original languageEnglish
Article number02BA01
JournalJapanese journal of applied physics
Volume49
Issue number2 PART 2
DOIs
Publication statusPublished - 2010 Dec 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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