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Article Dans Une Revue Applied Surface Science Année : 2009

Bulk and surface plasmon excitations in amorphous carbon measured by core-level photoelectron spectroscopy

Christian Godet
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Denis David
Soraya Ababou-Girard
Francine Solal

Résumé

Bulk and surface plasmon excitations in amorphous carbon (a-C) films have been characterized by core-level loss spectroscopy. Atomically smooth a-C surfaces were used in their as-grown state, after UHV annealing and after covalent immobilization of dense molecular monolayers (2-4 × 1014 cm−2), either perfluorinated or labelled with an ester functionality. X-ray photoelectron spectra reveal a sp3-rich hybridization of surface C atoms, with a σ + π plasmon loss distribution centred at 29.5 ± 1 eV, characteristic of a high electron density value. For molecular grafted surfaces, the energy distribution of plasmon losses reveals new contributions in the range 15-25 eV (clearly separated from the energy distribution of the bulk σ + π plasmon loss of a-C) with an increasing loss probability observed at grazing photoemission angles. A simple parameterization method is presented to derive bulk and surface plasmon loss distributions from angular core level loss spectroscopy (XPS) data, without a priori assumptions on the shape of the loss energy distributions.

Dates et versions

hal-00663692 , version 1 (27-01-2012)

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Citer

Christian Godet, Denis David, Hussein Sabbah, Soraya Ababou-Girard, Francine Solal. Bulk and surface plasmon excitations in amorphous carbon measured by core-level photoelectron spectroscopy. Applied Surface Science, 2009, 255 (13-14), pp.6598-6606. ⟨10.1016/J.APSUSC.2009.02.050⟩. ⟨hal-00663692⟩
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