Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 72, Issue 9, Pages 1101-1103Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2011.06.012
Keywords
Nanostructures; Raman spectroscopy; Electrical conductivity
Funding
- National Science Council of Taiwan [NSC 98-2113-M-033-002-MY2]
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Multi-walled carbon nanotubes (MWCNTs) were treated with a radio-frequency discharge. We found that MWCNTs showed opposite trends in electrical conductivity when treated with oxygen and hydrogen plasmas. MWCNTs showed enhanced electrical conductivity when placed at cathode with oxygen plasma treatment, whereas MWCNTs treated at positive column did not show such a trend. In contrast, the conductivity of MWCNTs dropped sharply with hydrogen plasma treatment. The measured conductivity trends of MWCNTs are correlated with observed Raman spectral shift. The possible mechanisms of the change in electrical conductivity in plasma-treated MWCNTs are discussed. (C) 2011 Elsevier Ltd. All rights reserved.
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