Archivio Istituzionale della RicercaMetal-dielectric nanostructures are synthesized optimizing their capabilities of enhancing Raman scattering and fluorescence emission. Silver nanoparticles with controlled average size and morphology are obtained by dipping porous silicon (p-Si) specimens in silver nitrate acqueous solutions. The effects of silvered p-Si in enhancing Raman Scattering were investigated usinga cyanine dye showing detectable concentration as low as 10-8M. In order to obtain photoluminescence enhancement, silvered p-Si samples are coated by ultrathin films of amorphous silicon nitride. The analysis of metal-dielectric nanostructures show an energy red-shift of the Surface Plasmon resonances connected to the changes of the dielectrics surrounding the metal particles. In particular, the thickness of such a coating can be tuned in order to enhance the fluorescence emission.
Metal-dielectric nanostructures for amplified Raman and fluorescence spectroscopy / Alessandro, Virga; Rossana, Gazia; Luca, Pallavidino; Mandracci, Pietro; Descrovi, Emiliano; Chiodoni, Angelica; Geobaldo, Francesco; Giorgis, Fabrizio. - In: PHYSICA STATUS SOLIDI. C, CURRENT TOPICS IN SOLID STATE PHYSICS. - ISSN 1862-6351. - STAMPA. - 7:3-4(2010), pp. 1196-1199. [10.1002/pssc.200982688]
Metal-dielectric nanostructures for amplified Raman and fluorescence spectroscopy
MANDRACCI, Pietro;DESCROVI, EMILIANO;CHIODONI, ANGELICA;GEOBALDO, FRANCESCO;GIORGIS, FABRIZIO
2010
Abstract
Metal-dielectric nanostructures are synthesized optimizing their capabilities of enhancing Raman scattering and fluorescence emission. Silver nanoparticles with controlled average size and morphology are obtained by dipping porous silicon (p-Si) specimens in silver nitrate acqueous solutions. The effects of silvered p-Si in enhancing Raman Scattering were investigated usinga cyanine dye showing detectable concentration as low as 10-8M. In order to obtain photoluminescence enhancement, silvered p-Si samples are coated by ultrathin films of amorphous silicon nitride. The analysis of metal-dielectric nanostructures show an energy red-shift of the Surface Plasmon resonances connected to the changes of the dielectrics surrounding the metal particles. In particular, the thickness of such a coating can be tuned in order to enhance the fluorescence emission.
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https://hdl.handle.net/11583/2286328
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