%0 Journal Article
%T Electronic properties of Cs-intercalated single-walled carbon nanotubes derived from nuclear magnetic resonance
%+ Laboratoire Charles Coulomb (L2C)
%A Abou-Hamad, E.
%A Goze-Bac, Christophe
%A Nitze, F.
%A Schmid, M.
%A Aznar, Raymond
%A Mehring, M.
%A Wagberg, T.
%< avec comité de lecture
%Z L2C:11-147
%@ 1367-2630
%J New Journal of Physics
%I Institute of Physics: Open Access Journals
%V 13
%P 053045
%8 2011
%D 2011
%R 10.1088/1367-2630/13/5/053045
%K NMR
%K SPECTROSCOPY
%K GRAPHITE
%K TUBULES
%Z Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
%Z Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph]
%Z Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]Journal articles
%X We report on the electronic properties of Cs-intercalated single-walled carbon nanotubes (SWNTs). A detailed analysis of the C-13 and Cs-133 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(E-F) at the Fermi level of the SWNTs as determined from spin-lattice relaxation measurements. In particular, there are two distinct electronic phases called alpha and beta 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 (alpha-phase), whereas it reaches a plateau in the range 0.05 <= x <= 0.143 at high intercalation levels (beta-phase). The new beta-phase is accompanied by a hybridization of Cs(6s) orbitals with C(sp(2)) orbitals of the SWNTs. In both phases, two types of metallic nanotubes are found with a low and a high local n(E-F), corresponding to different local electronic band structures of the SWNTs.
%G English
%L hal-00627786
%U https://hal.science/hal-00627786
%~ CNRS
%~ L2C
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021