Resonant Raman Scattering by quadrupolar vibrations of Ni-Ag Core-shell Nanoparticles

Resonant Raman Scattering by quadrupolar vibrations of Ni-Ag Core-shell Nanoparticles

Low-frequency Raman scattering experiments have been performed on thin films consisting of nickel-silver composite nanoparticles embedded in alumina matrix. It is observed that the Raman scattering by the quadrupolar modes, strongly enhanced when the light excitation is resonant with the surface dip...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Vol. 65
Main Authors: Portales, H., Saviot, L., Duval, E., Gaudry, M., Cottancin, E., Pellarin, M., Lerme, J., Broyer, M.
Format: Journal Article
Language:English
Published: American Physical Society 15-04-2002
Subjects:
Condensed Matter
Other
Physics
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Summary:Low-frequency Raman scattering experiments have been performed on thin films consisting of nickel-silver composite nanoparticles embedded in alumina matrix. It is observed that the Raman scattering by the quadrupolar modes, strongly enhanced when the light excitation is resonant with the surface dipolar excitation, is mainly governed by the silver electron contribution to the plasmon excitation. The Raman results are in agreement with a core-shell structure of the nanoparticles, the silver shell being loosely bonded to the nickel core.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.65.165422