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Communication Dans Un Congrès Année : 2017

Low wavenumber Raman scattering experiments of Cobalt nanoparticles

Résumé

Raman spectroscopy is widely used in many academic and industrial applications. Basicaly, the finger print region (~450 to 1500 cm-1) and high frequency region above 2500 cm-1 are the most observed spectroscopic ranges. However low wavenumber region (below 50 cm-1) is extremely relevant to gain informations about collective or external modes. Until recently, very specific Raman systems as multiple monochromators was used to access low wavenumber region due to close vicinity of Rayleigh line. Thanks to our specific system we report the first observation of low wavenumber Raman scattering from cobalt nanoparticles under 514.5nm laser excitation. These 7.4nm diameter particles were self-organized in 3D superlattices, but we assign the Raman signature to vibrations of the individual nanoparticles, according to Lamb's elastic sphere model. Our results demonstrate that surface plasmon–phonon coupling is not mandatory to observe Lamb's modes in metal nanoparticles.
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Dates et versions

hal-04071389 , version 1 (17-04-2023)

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  • HAL Id : hal-04071389 , version 1

Citer

Guilhem Simon. Low wavenumber Raman scattering experiments of Cobalt nanoparticles. Analytix 2017, Mar 2017, FUKUOKA, Japan. ⟨hal-04071389⟩
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