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Effect of the annealing atmosphere on the Au site in Er + Au-implanted silica

✍ Scribed by C. Maurizio; G. Perotto; E. Trave; G. Pellegrini; G. Mattei; P. Mazzoldi

Publisher: Elsevier Science
Year: 2010
Tongue: English
Weight: 378 KB
Volume: 268
Category: Article
ISSN: 0168-583X
DOI: 10.1016/j.nimb.2010.05.093

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✦ Synopsis

The Au site in Er + Au-implanted silica has been investigated by X-ray absorption spectroscopy, after annealing at 600 °C in either neutral N 2 or reducing H 2 (4%):N 2 (95%) atmosphere. High-resolution X-ray fluorescence spectra collected near the Au L III -edge indicate the presence of oxidized Au atoms in the N 2 -annealed sample. Correspondingly, the EXAFS analysis shows a weak Au-O coordination only for the sample annealed in neutral atmosphere. For both cases, the EXAFS results evidence the presence of sub-nanometer metallic Au clusters: the cluster size, always below 1 nm, is smaller for the sample annealed in reducing atmosphere. The Au clusters embedded in the Er-doped layer promote a strong enhancement of the Er photoluminescence emission at 1.5 lm.

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Effect of the annealing atmosphere on the Au site in Er&#xa0;+&#xa0;Au-implanted silica

✦ Synopsis

Effect of the annealing atmosphere on the Au site in Er + Au-implanted silica