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13C NMR study of single-walled carbon nanotubes

✍ Scribed by Kyuhong Lee; K.H. Kang; B.J. Mean; Moohee Lee; Jae-Kap Jung; Kwon-Sang Ryu; Young Hee Lee

Publisher: Elsevier Science
Year: 2005
Tongue: English
Weight: 196 KB
Volume: 359-361
Category: Article
ISSN: 0921-4526
DOI: 10.1016/j.physb.2005.01.444

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✦ Synopsis

We have performed 13 C nuclear magnetic resonance (NMR) measurements on single-walled carbon nanotubes. Spectrum, shift, linewidth, and T 1 have been measured as a function of temperature from 4.6 K to 200 K under the magnetic field of 4.7 T. Spectrum shows a narrow lineshape for the 13 C nucleus. Shift is very small around 100 ppm and shows no significant change in the whole temperature range. The linewidth becomes broader with decreasing temperature from 13 kHz at 200 K to 22 kHz at 4.6 K. The spin-lattice relaxation recovery is made of three channels of relaxation like other nanotubes. However, all three relaxation rates are very weakly dependent on temperature. While the fastest rate is found to come from remaining catalysts after synthesis, the other two rates from metallic and semiconducting parts of the nanotubes seem to be altered during exposure to the atmosphere.

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