Laboratoire Charles Coulomb UMR 5221 CNRS/UM2 (L2C)

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

Structural properties of rubidium intercalated single walled carbon nanotubes

par Sébastien LAYSSAC - publié le

Involved researchers : J.L. Bantignies, L. Alvarez, J.L.Sauvajol, A. Zahab, R. Aznar, E. Alibert
Collaboration : F. Villain, V. Briois (SAMBA, Soleil, Saint Aubin)

Alkali metal insertion into SWNT bundle is shown to lead to a significant increase of the SWNT conductivity but the structure of the intercalated phases as a function of the doping rate is still an open question. In particular, the intercalation sites as a function of the doping rate are still not identified. The different sites available are displayed on figure 1. In the aim to light these points, we are currently developing an experimental set-up devoted to multi-spectroscopy investigations during an in situ intercalation of alkali metal vapour phase (figure 2).
We want to probe the local arrangement around the dopant by X-ray Absorption experiment (EXAFS) at Soleil synchrotron Facility, the electrical conductivity and the vibrational properties by Raman spectroscopy. More precisely, the study consists in determining the correlation between the electrical and the structural properties of intercalated single walled nanotubes. However, because alkali metals are extremely air sensitive, encapsulation into the inner core of SWNTs is a mandatory requirement for further potential applications (in fact, most of the alkali metal ions are naturally inserted inside the nanotubes). Our final aim is the identification of insertion phases of controlled and chosen electronic properties that could be stable under normal conditions.

Figure 1 : Interstitial possible sites - © L2C

JL. Bantignies et al, Phys. Rev. B, 71, 195419, (2005)

Figure 2 : Home made in situ experimental set-up - © L2C

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