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Electronic Structures of Single-Walled Carbon Nanotubes Determined by NMR

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Science  21 Apr 2000:
Vol. 288, Issue 5465, pp. 492-494
DOI: 10.1126/science.288.5465.492

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Abstract

Single-walled carbon nanotubes were studied by 13C nuclear magnetic resonance (NMR). Two types of 13C nuclear spins were identified with different spin-lattice relaxation rates. The fast-relaxing component, assigned to metallic tubes, followed the relaxation behavior expected in metals, and the density-of-states at the Fermi level increased with decreasing tube diameter. The slow-relaxing component has a significantly lower density-of-states at the Fermi level. Exposure to oxygen has a substantial effect on relaxation rates of both components.

  • * To whom correspondence should be addressed. E-mail: yuewu{at}physics.unc.edu

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