Dielectric response of isolated carbon nanotubes investigated by spatially resolved electron energy-loss spectroscopy: From multiwalled to single-walled nanotubes

O. Stéphan, D. Taverna, M. Kociak, K. Suenaga, L. Henrard, C. Colliex

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

To investigate the dielectric response of isolated single-walled carbon nanotubes, (SWCNTs), spatially resolved electron energy-loss spectroscopy measurements have been carried out using a scanning transmission electron microscope in a near-field geometry. Spectra have been compared with those acquired on multiwalled carbon nanotubes (MWCNTs) made of different numbers of layers, and with simulations performed within the framework of the continuum dielectric theory, taking into account the local anisotropic character of these nanostructures and adapted to the cylindrical geometry. Experimental data show a dispersion of mode energies as a function of the ratio of the internal and external diameters, as predicted by the continuum dielectric model. For thin MWCNTs, two polarization modes have been identified at 15 and 19 eV, indexed as tangential and radial surface-plasmon modes, respectively, resulting from the coupling of the two surface modes on the internal and external surfaces of the nanotubes. We finally show that the dielectric response of a SWCNT, displaying a single energy mode at 15 eV, can be understood in the dielectric model as the thin layer limit of surface-plasmon excitation of MWCNTs.

langue originaleAnglais
Numéro d'article155422
Pages (de - à)1554221-1554226
Nombre de pages6
journalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Numéro de publication15
Les DOIs
étatPublié - 15 oct. 2002

Empreinte digitale

Carbon Nanotubes
Electron energy loss spectroscopy
Nanotubes
Carbon nanotubes
nanotubes
energy dissipation
carbon nanotubes
electron energy
Multiwalled carbon nanotubes (MWCN)
spectroscopy
Single-walled carbon nanotubes (SWCN)
continuums
Geometry
geometry
Nanostructures
near fields
Electron microscopes
electron microscopes
Polarization
Scanning

Citer ceci

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title = "Dielectric response of isolated carbon nanotubes investigated by spatially resolved electron energy-loss spectroscopy: From multiwalled to single-walled nanotubes",
abstract = "To investigate the dielectric response of isolated single-walled carbon nanotubes, (SWCNTs), spatially resolved electron energy-loss spectroscopy measurements have been carried out using a scanning transmission electron microscope in a near-field geometry. Spectra have been compared with those acquired on multiwalled carbon nanotubes (MWCNTs) made of different numbers of layers, and with simulations performed within the framework of the continuum dielectric theory, taking into account the local anisotropic character of these nanostructures and adapted to the cylindrical geometry. Experimental data show a dispersion of mode energies as a function of the ratio of the internal and external diameters, as predicted by the continuum dielectric model. For thin MWCNTs, two polarization modes have been identified at 15 and 19 eV, indexed as tangential and radial surface-plasmon modes, respectively, resulting from the coupling of the two surface modes on the internal and external surfaces of the nanotubes. We finally show that the dielectric response of a SWCNT, displaying a single energy mode at 15 eV, can be understood in the dielectric model as the thin layer limit of surface-plasmon excitation of MWCNTs.",
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Dielectric response of isolated carbon nanotubes investigated by spatially resolved electron energy-loss spectroscopy : From multiwalled to single-walled nanotubes. / Stéphan, O.; Taverna, D.; Kociak, M.; Suenaga, K.; Henrard, L.; Colliex, C.

Dans: Physical Review B - Condensed Matter and Materials Physics, Vol 66, Numéro 15, 155422, 15.10.2002, p. 1554221-1554226.

Résultats de recherche: Contribution à un journal/une revueArticle

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T1 - Dielectric response of isolated carbon nanotubes investigated by spatially resolved electron energy-loss spectroscopy

T2 - From multiwalled to single-walled nanotubes

AU - Stéphan, O.

AU - Taverna, D.

AU - Kociak, M.

AU - Suenaga, K.

AU - Henrard, L.

AU - Colliex, C.

PY - 2002/10/15

Y1 - 2002/10/15

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