Laboratoire Charles Coulomb UMR 5221 CNRS/UM2 (L2C)


Accueil > La Recherche > Axes & Equipes > Nanostructures & Spectroscopies > Equipe : Nanomatériaux > Thème : Dopage, confinement et fonctionnalisation dans les nanotubes

Structural properties of carbon peapods

par Sébastien LAYSSAC - publié le

Involved researchers : L. Alvarez, J.L.Sauvajol, R. Almairac, M.Chorro, S. Rols, J. Cambedouzou, J.L. Sauvajol
Collaborations : M. Mezouar, ID 27 (ESRF, Grenoble), H. Kataura (AIST, Japan)

Recently, much effort have been focussed on the so-called "carbon peapods", consisting in C60 molecules trapped into single-walled carbon nanotubes (figure 1). Structural properties have been studied under high-pressure/high-temperature conditions (HPHT) by in situ X-ray diffraction on the ID27 beamline at ESRF. Under ambient conditions, the results showed that fullerenes form a 1D crystal inside the tubes with lattice parameter of 9.8 Å in good agreement with van der Waals interaction between the C60 molecules. At 4 GPa, increasing the temperature up to 1023 degrees leads to a progressive C60 polymerization by cyclo-addition reaction that is associated to a shortening of C60-C60 distance down to 8.7 A. Back to ambient conditions, the C60-C60 chain remains polymerized, emphasizing the high stability of this material.

M. Chorro et al, Phys.Rev.B , 74, 205425 (2006)