13C NMR on intercalated 2D-polymerised C60 and modified peapods.
2004 (English)In: Electronic Properties of Synthetic Nanostructures: Proceedings of the XVIII International Winter School/Euroconference on Electronic Properties of Novel Materials, Kirchhberg 2004, Melville, NY: American Institute of Physics (AIP) , 2004, 238-41 p.Conference paper (Refereed)
We present 13C NMR results on the intercalated 2D C60-polymers Li4-xNaxC60 (x=0-4 with half integer steps) showing that while Li4C60 forms a tetragonal polymer with double polymer bonds between the molecules, Na4C60 form a monoclinic polymer with single polymer bonds. The chemical shift is much larger for Li-rich samples than for Na-rich samples, indicating perhaps a different type of interaction with the C60 molecules. The crossover between the two structures appears to be at the composition Li2.5Na1.5C60 . We also show NMR data on SWNT filled with C60 molecules, so called peapods, showing that the NMR line of C60 can not be observed when the C60 is inside the tubes. Weinterpret this as resulting from a very long relaxation time, indicating that the dynamics of the C60 molecule is hindered by the nanotube walls.
Place, publisher, year, edition, pages
Melville, NY: American Institute of Physics (AIP) , 2004. 238-41 p.
, AIP Conference Proceedings, ISSN 0094-243X ; 723
Fullerenes, NMR, C60, fullerides, Li4C60, Na4C60, single wall carbon nanotubes, peapods, filled nanotubes, C60@SWNT, fullerene polymers, two-dimensional structure
Condensed Matter Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:umu:diva-11987DOI: 10.1063/1.1812081ISBN: 0-7354-0204-3OAI: oai:DiVA.org:umu-11987DiVA: diva2:151658
Editors: Hans Kuzmany, Jörg Fink, Michael Mehring and Siegmar Roth2007-03-182007-03-18Bibliographically approved