<sup>13</sup><i>C</i> NMR Chemical Shift of Single-Wall Carbon Nanotubes

Physical Review Letters 86, 3160 - 3163 (2001)

13C NMR Chemical Shift of Single-Wall Carbon Nanotubes

S. Latil, L. Henrard, C. Goze, P. Bernier, A. Rubio

We compute the magnetic shielding tensor within the London approximation and estimate the Knight shift of single-wall carbon nanotubes. Our results indicate that high resolution 13C NMR should be able to separate the metallic and insulator character of the nanotubes since a 11 ppm splitting is predicted from the respective resonances. As a model for disorder, bending, and defects in these structures, we investigate the magnetic response of nanotubes with finite size. We get a small line broadening coming from an intrinsic length dependent resonance effect. The nanotube packing is also studied and leads to a 20 ppm broadening which disappears under experimental high-resolution conditions.

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