Metallic properties of Li-intercalated carbon nanotubes investigated by NMR

Abstract

Electronic properties of single-walled carbon nanotubes intercalated with lithium are investigated by NMR. C13 NMR experiments reveal a metallic ground state for all of the following stoichiometries LiCx with x=10, 7, and 6. A continuous increase of the density of states at the Fermi level according to the Li concentration is observed up to x6. From Li7 NMR, evidence of inequivalent Li sites is reported, corresponding to preferential sites of intercalation and binding between Li and C. © 2006 The American Physical Society.