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Article Dans Une Revue Journal of Applied Physics Année : 2005

X-ray spectroscopy study of electronic structure of laser-irradiated Au nanoparticles in a silica film

P. Jonnard
H. Bercegol
  • Fonction : Auteur
L. Lamaignere
  • Fonction : Auteur
J.P. Morreeuw
  • Fonction : Auteur
J.L. Rullier
  • Fonction : Auteur

Résumé

The electronic structure of gold nanoparticles embedded in a silica film is studied, both before and after irradiation at 355 nm by a laser. The Au 5d occupied valence states are observed by x-ray emission spectroscopy. They show that before irradiation the gold atoms are in metallic states within the nanoparticles. After irradiation with a fluence of 0.5 J/cm2, it is found that gold valence states are close to those of a metal-poor gold silicide; thanks to a comparison of the experimental Au 5d states with the calculated ones for gold silicides using the density-functional theory. The formation of such a compound is driven by the diffusion of the gold atoms into the silica film upon the laser irradiation. At higher fluence, 1 J/cm2, we find a higher percentage of metallic gold that could be attributed to annealing in the silica matrix.
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Dates et versions

hal-00141243 , version 1 (12-04-2007)

Identifiants

Citer

P. Jonnard, H. Bercegol, L. Lamaignere, J.P. Morreeuw, J.L. Rullier, et al.. X-ray spectroscopy study of electronic structure of laser-irradiated Au nanoparticles in a silica film. Journal of Applied Physics, 2005, 97, 064306 (5 p.). ⟨10.1063/1.1858877⟩. ⟨hal-00141243⟩
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