2026-06-08T07:25:51Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/591212024-09-06T18:32:50Zcom_20.500.14352_14col_20.500.14352_15
Cathodoluminescence of electron irradiated opal-based nanocomposites
Díaz-Guerra Viejo, Carlos
Piqueras De Noriega, Francisco Javier
Golubev, VG.
Kurdyukov, D.A.
Pevtsov, A. B.
538.9
Defect Structure
Silicon Dioxide
SiO_2
Microcharacterization
Photoluminescence
Spectroscopy
Crystals
Centers
Matrix
Quartz
Física de materiales
© 2001 American Institute of Physics.
This work was supported by MCYT (Project No. MAT2000-2119) and the Russian R&D program ‘‘Nanostructures’’
(Grant No. 97-2016).
Synthetic opals infilled with silicon (opal-Si) and with Si and Pt (opal-Pt-Si) have been irradiated in a scanning electron microscope under high excitation conditions. Electron irradiation-induced changes in the morphology and luminescent defect structure of both types of nanocomposites were assessed by scanning electron microscopy and by cathodoluminescence (CL) microscopy and spectroscopy. Irradiation causes strong morphological changes in the ordered structure of the matrix and quenching of the nanocrystals-related CL emission in the opal-Si samples. On the contrary, such effects are not observed in the opal-Pt-Si nanocomposites. In both types of samples, electron irradiation induces the appearance of a CL band centered at 2.95 eV, attributed to complex centers involving oxygen vacancies in the silica spheres forming the matrix.
MCYT
Russian R&D program ‘‘Nanostructures’’
Depto. de Física de Materiales
Fac. de Ciencias Físicas
TRUE
pub
2023-06-20T19:01:22Z
2023-06-20T19:01:22Z
2001-10-01
journal article
https://hdl.handle.net/20.500.14352/59121
0021-8979
eng
MAT2000-2119
97-2016
open access
application/pdf
American Institute of Physics