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

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 5 d occupied valence states are observed by x-ray emission spectroscopy. They show that before irradiation the gold atoms are in metallic states within...

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Bibliographic Details
Published in:Journal of applied physics 2005-03, Vol.97 (6), p.064306-064306-5
Main Authors: Jonnard, P., Bercegol, H., Lamaignère, L., Morreeuw, J.-P., Rullier, J.-L., Cottancin, E., Pellarin, M.
Format: Article
Language:English
Subjects:
ANNEALING
Atomic and Molecular Clusters
ATOMS
COMPARATIVE EVALUATIONS
DENSITY FUNCTIONAL METHOD
ELECTRONIC STRUCTURE
EMISSION SPECTRA
EMISSION SPECTROSCOPY
FERMI LEVEL
GOLD
GOLD SILICIDES
IRRADIATION
LASERS
MATERIALS SCIENCE
NANOSTRUCTURES
PARTICLES
Physics
SILICA
THIN FILMS
VALENCE
X-RAY SPECTRA
X-RAY SPECTROSCOPY
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Summary: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 5 d 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 ∕ cm 2 , 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 5 d 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 ∕ cm 2 , we find a higher percentage of metallic gold that could be attributed to annealing in the silica matrix.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1858877