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School of Materials Science and Engineering

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Author: Bonard, Jean-Marc × Author: Wang, Z. L. (Zhong Lin) × End date: 1999 ×

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Plasmon excitations in graphitic carbon spheres

1998-06-15 , Stöckli, Thomas , Bonard, Jean-Marc , Châtelain, André , Wang, Z. L. (Zhong Lin) , Stadelmann, Pierre

Electron energy loss spectroscopy in a high-resolution transmission electron microscope has recently been used with success to characterize the electronic properties of closed cage nanometer-size graphitic particles. In the plasmon region, the experimental data reveal interesting size-dependent variations, which are not yet fully understood. The difficulties encountered in the interpretation of the spectra are principally due to the lack of a complete theoretical treatment of the anisotropic dielectric response in nanometer-size particles. In order to obtain a better understanding of the experimental data we propose a model based on nonrelativistic local dielectric response theory for electrons penetrating through a nested concentric-shell fullerene or the so-called ‘‘carbon onion.’’ The anisotropy of the electronic properties of the sphere is taken into account via the frequency-dependent dielectric tensor of graphite. The model can be applied to simulate electron energy loss spectra as well as line scans through energy filtered images and allows thus a direct comparison to experimental data.

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Plasmon excitations in carbon onions: Model vs. measurements

1998-03 , Stöckli, Thomas , Wang, Z. L. (Zhong Lin) , Bonard, Jean-Marc , Stadelmann, Pierre , Châtelain, André

Non-relativistic local dielectric response theory has proven successful in the interpretation of Electron Energy Loss data of nanometer-size isotropic particles of different geometries. In previous work, we have adapted this model to take into account anisotropy as encountered in the case of carbon onions. We have shown that this anisotropy needs to be taken into account since important deviations with respect to an isotropic model can be observed. In this contribution, we report on the first energy filtered images of carbon onions and compare intensity profiles across the spheres to our calculations.

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