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Electronic properties of Cs-intercalated single-walled carbon nanotubes derived from nuclear magnetic resonance
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
Université Montpellier II, France.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. (Nanostructured Carbon)
Physikalisches Institut, Universität Stuttgart, Germany.
Vise andre og tillknytning
2011 (engelsk)Inngår i: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 13, s. 053045 (1)-(9)Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We report on the electronic properties of Cs-intercalated singlewalled carbon nanotubes (SWNTs). A detailed analysis of the 13C and133Cs 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.

sted, utgiver, år, opplag, sider
IOP Publishing Ltd and Deutsche Physikalische Gesellschaft , 2011. Vol. 13, s. 053045 (1)-(9)
Emneord [en]
Carbon nanotubes, NMR, Intercalation, Cesium, Electronic properties
HSV kategori
Forskningsprogram
fysik
Identifikatorer
URN: urn:nbn:se:umu:diva-45736DOI: 10.1088/1367-2630/13/5/053045OAI: oai:DiVA.org:umu-45736DiVA, id: diva2:434517
Forskningsfinansiär
Swedish Research Council, 2010-3973Tilgjengelig fra: 2011-08-16 Laget: 2011-08-15 Sist oppdatert: 2018-06-08bibliografisk kontrollert

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