Electronic properties of Cs-intercalated single-walled carbon nanotubes derived from nuclear magnetic resonance

Details Electronic properties of Cs-intercalated single-walled carbon nanotubes derived from nuclear magnetic resonance Electronic properties of Cs-intercalated single-walled carbon nanotubes derived from nuclear magnetic resonance

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13e3045a&link_type=abstract

New Journal of Physics, Volume 13, Issue 5, pp. 053045 (2011).

Physics

2

Scientific paper

We report on the electronic properties of Cs-intercalated single-walled carbon nanotubes (SWNTs). A detailed analysis of the 13C and 133Cs nuclear magnetic resonance (NMR) spectra reveals an increased metallization of the pristine SWNTs under Cs intercalation. The 'metallization' of CsxC materials where x=0-0.144 is evidenced from the increased local electronic density of states (DOS) n(EF) at the Fermi level of the SWNTs as determined from spin-lattice relaxation measurements. In particular, there are two distinct electronic phases called α and β and the transition between these occurs around x=0.05. The electronic DOS at the Fermi level increases monotonically at low intercalation levels x<0.05 (α-phase), whereas it reaches a plateau in the range 0.05<=x<=0.143 at high intercalation levels (β-phase). The new β-phase is accompanied by a hybridization of Cs(6s) orbitals with C(sp2) orbitals of the SWNTs. In both phases, two types of metallic nanotubes are found with a low and a high local n(EF), corresponding to different local electronic band structures of the SWNTs.

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