Open AccessCathodoluminescence of electron irradiated opal-based nanocomposites
Author(s) -
C. Dı́az-Guerra,
J. Piqueras,
В. Г. Голубев,
D. A. Kurdyukov,
А. Б. Певцов
Publication year - 2001
Publication title -
journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.699
H-Index - 319
eISSN - 1089-7550
pISSN - 0021-8979
DOI - 10.1063/1.1390307
Subject(s) - cathodoluminescence , scanning electron microscope , materials science , irradiation , electron beam processing , luminescence , nanocomposite , silicon , electron microscope , quenching (fluorescence) , transmission electron microscopy , spectroscopy , electron excitation , analytical chemistry (journal) , chemical engineering , nanotechnology , electron , optoelectronics , composite material , chemistry , optics , fluorescence , physics , engineering , chromatography , quantum mechanics , nuclear physics
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
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