Journal
DIAMOND AND RELATED MATERIALS
Volume 17, Issue 6, Pages 999-1002Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2008.02.035
Keywords
carbon nanofibers; carbon nanotubes; plasma CVD; optical emission
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The low-temperature synthesis of carbon nanofibers was demonstrated. When a small amount of O-2 was added to the CO/Ar plasma, the diameter of the CNFs decreased and the deposition of amorphous carbon and fiber bundling were suppressed. On the other hand, when H-2 was added, the diameter increased, and at higher H-2 flow rates, only smooth carbon film was deposited. At the optimum oxygen concentration of CO/O-2=1/0.003, vertically aligned free-standing CNFs can be synthesized at low temperature as low as 90 degrees C. Our spectroscopic study reveals that there is a steady correlation between C-2 radical formation and CNFs growth. (C) 2008 Elsevier B.V. All rights reserved.
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