Electronic structure and optical properties of concentric-shell fullerenes from electron-energy-loss spectroscopy in transmission

T. Pichler, M. Knupfer, M. S. Golden, J. Fink, and T. Cabioc’h
Phys. Rev. B 63, 155415 – Published 30 March 2001
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Abstract

We present momentum-dependent measurements of the loss function of bulk samples of concentric-shell fullerenes using electron-energy-loss spectroscopy in transmission. It is shown that the π and π+σ plasmons of these so-called carbon onions exhibit a significant momentum dependence, with a dispersion coefficient of about two-thirds of that of the corresponding plasmons in graphite. The optical properties derived from a Kramers-Kronig analysis are reminiscent of those found for polycrystalline disordered graphite. Furthermore, we find no changes of the electronic properties by alternating the average diameter of these carbon nanoparticles between 4 and 8 nm. Consequently, concentric-shell fullerenes can be regarded as spherical graphitic nanoparticles, whose electronic structure and optical properties, down to a particle size of at least 4 nm, are strongly governed by the band structure of graphite.

  • Received 17 April 2000

DOI:https://doi.org/10.1103/PhysRevB.63.155415

©2001 American Physical Society

Authors & Affiliations

T. Pichler

  • Institut für Materialphysik Universität Wien, A-1090 Wien, Austria

M. Knupfer, M. S. Golden, and J. Fink

  • Institute for Solid State and Materials Research (IFW) Dresden, P.O. Box 270016, D-01171 Dresden, Germany

T. Cabioc’h

  • Université de Poitiers, Laboratoire de Métallurgie Physique, UMR 6630 CNRS, Bâtiment SP2MI, Teleport 2, Bd 3, BP 179, 86660 Futuroscope Cedex, France

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Vol. 63, Iss. 15 — 15 April 2001

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