期刊
JAPANESE JOURNAL OF APPLIED PHYSICS
卷 49, 期 2, 页码 -出版社
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.49.02BA01
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资金
- Tohoku University
- Ministry of Education, Culture, Sports, Science, and Technology, Japan
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 H-2 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/H-alpha shows a tendency similar to the intensity ratio of G- and D- band (iG/iD) of SWNTs as a function of H-2 concentration. This indicates the CH/H-alpha 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. (C) 2010 The Japan Society of Applied Physics
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