Plasmons in layered nanospheres and nanotubes investigated by spatially resolved electron energy-loss spectroscopy

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

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

We present an extensive electron energy loss spectroscopy study of the low-loss energy region, recorded on multishell carbon and boron-nitride nanotubes and carbon hyperfullerenes. Collections of spectra were recorded in a scanning transmission electron microscope by scanning a subnanometer probe from vacuum into the center of the nano-objects. This experimental technique provides the unique ability of disentangling and identifying the different excitation modes of a nanoparticle. We concentrate on the study of surface modes excited in a near-field geometry where the coupling distance between the electron beam and the surface of the nano-objects is accurately monitored. Similarities between surface collective excitations in the different layered nanostructures (cylindrical or spherical, boron nitride, or carbon constituted) are pointed out. Two surface modes at 12-13 eV and 17-18 eV are experimentally clearly evidenced. We show that these modes are accurately described by a classical continuum dielectric model taking fully into account the anisotropic character and the hollow geometry of the nanoparticles. These two modes are shown to be directly related to the in-plane and out-of-plane components of the dielectric tensor. The higher-energy mode (in-plane mode) is shown to shift to higher energy with decreasing impact parameter, as a result of an increase in the weights of the high-order multipolar modes while reaching the surface of the nano-objects.

langue originaleAnglais
Pages (de - à)13936-13944
Nombre de pages9
journalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Numéro de publication20
Les DOIs
étatPublié - 1 janv. 2000

Empreinte digitale

Plasmons
Nanospheres
Electron energy loss spectroscopy
plasmons
Nanotubes
nanotubes
energy dissipation
electron energy
Boron nitride
spectroscopy
Nanoparticles
Scanning
boron nitrides
Carbon Nanotubes
Carbon
Carbon nitride
Geometry
Tensors
Electron beams
Nanostructures

Citer ceci

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title = "Plasmons in layered nanospheres and nanotubes investigated by spatially resolved electron energy-loss spectroscopy",
abstract = "We present an extensive electron energy loss spectroscopy study of the low-loss energy region, recorded on multishell carbon and boron-nitride nanotubes and carbon hyperfullerenes. Collections of spectra were recorded in a scanning transmission electron microscope by scanning a subnanometer probe from vacuum into the center of the nano-objects. This experimental technique provides the unique ability of disentangling and identifying the different excitation modes of a nanoparticle. We concentrate on the study of surface modes excited in a near-field geometry where the coupling distance between the electron beam and the surface of the nano-objects is accurately monitored. Similarities between surface collective excitations in the different layered nanostructures (cylindrical or spherical, boron nitride, or carbon constituted) are pointed out. Two surface modes at 12-13 eV and 17-18 eV are experimentally clearly evidenced. We show that these modes are accurately described by a classical continuum dielectric model taking fully into account the anisotropic character and the hollow geometry of the nanoparticles. These two modes are shown to be directly related to the in-plane and out-of-plane components of the dielectric tensor. The higher-energy mode (in-plane mode) is shown to shift to higher energy with decreasing impact parameter, as a result of an increase in the weights of the high-order multipolar modes while reaching the surface of the nano-objects.",
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Plasmons in layered nanospheres and nanotubes investigated by spatially resolved electron energy-loss spectroscopy. / Kociak, M.; Henrard, L.; Stéphan, O.; Suenaga, K.; Colliex, C.

Dans: Physical Review B - Condensed Matter and Materials Physics, Vol 61, Numéro 20, 01.01.2000, p. 13936-13944.

Résultats de recherche: Contribution à un journal/une revueArticle

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AB - We present an extensive electron energy loss spectroscopy study of the low-loss energy region, recorded on multishell carbon and boron-nitride nanotubes and carbon hyperfullerenes. Collections of spectra were recorded in a scanning transmission electron microscope by scanning a subnanometer probe from vacuum into the center of the nano-objects. This experimental technique provides the unique ability of disentangling and identifying the different excitation modes of a nanoparticle. We concentrate on the study of surface modes excited in a near-field geometry where the coupling distance between the electron beam and the surface of the nano-objects is accurately monitored. Similarities between surface collective excitations in the different layered nanostructures (cylindrical or spherical, boron nitride, or carbon constituted) are pointed out. Two surface modes at 12-13 eV and 17-18 eV are experimentally clearly evidenced. We show that these modes are accurately described by a classical continuum dielectric model taking fully into account the anisotropic character and the hollow geometry of the nanoparticles. These two modes are shown to be directly related to the in-plane and out-of-plane components of the dielectric tensor. The higher-energy mode (in-plane mode) is shown to shift to higher energy with decreasing impact parameter, as a result of an increase in the weights of the high-order multipolar modes while reaching the surface of the nano-objects.

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