A study of the Surface Enhanced Raman Scattering (SERS) from micrometric metallic nanoparticle aggregates is presented. The sample is obtained from the self-assembly on glass slides of micro-clusters of silver nanoparticles (60 and 100 nm diameter), functionalized with the organic molecule 4-aminothiophenol in water solution. For nanoparticle clusters at the micron scale, a maximum enhancement factor of 10(9) is estimated from the SERS over the Raman intensity ratio normalized to the single molecule contribution. Atomic force microscopy, correlated to spatially resolved Raman measurements, allows highlighting the connection between morphology and efficiency of the plasmonic system. The correlation between geometric features and SERS response of the metallic structures reveals a linear trend of the cluster maximum scattered intensity as a function of the surface area of the aggregate. On given clusters, the intensity turns out to be also influenced by the number of stacking planes of the aggregate, thus suggesting a plasmonic waveguide effect. The linear dependence results weakened for the largest area clusters, suggesting 30 mu m(2) as the upper limit for exploiting the coherence over large scale of the plasmonic response. (C) 2014 AIP Publishing LLC.

Fasolato, C., Domenici, F., Sennato, S., Mura, F., De Angelis, L., Luongo, F., et al. (2014). Dimensional scale effects on surface enhanced Raman scattering efficiency of self-assembled silver nanoparticle clusters. APPLIED PHYSICS LETTERS, 105(7) [10.1063/1.4893373].

Dimensional scale effects on surface enhanced Raman scattering efficiency of self-assembled silver nanoparticle clusters

Domenici F.
Investigation
;
2014-01-01

Abstract

A study of the Surface Enhanced Raman Scattering (SERS) from micrometric metallic nanoparticle aggregates is presented. The sample is obtained from the self-assembly on glass slides of micro-clusters of silver nanoparticles (60 and 100 nm diameter), functionalized with the organic molecule 4-aminothiophenol in water solution. For nanoparticle clusters at the micron scale, a maximum enhancement factor of 10(9) is estimated from the SERS over the Raman intensity ratio normalized to the single molecule contribution. Atomic force microscopy, correlated to spatially resolved Raman measurements, allows highlighting the connection between morphology and efficiency of the plasmonic system. The correlation between geometric features and SERS response of the metallic structures reveals a linear trend of the cluster maximum scattered intensity as a function of the surface area of the aggregate. On given clusters, the intensity turns out to be also influenced by the number of stacking planes of the aggregate, thus suggesting a plasmonic waveguide effect. The linear dependence results weakened for the largest area clusters, suggesting 30 mu m(2) as the upper limit for exploiting the coherence over large scale of the plasmonic response. (C) 2014 AIP Publishing LLC.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/02 - Chimica Fisica
English
Con Impact Factor ISI
Fasolato, C., Domenici, F., Sennato, S., Mura, F., De Angelis, L., Luongo, F., et al. (2014). Dimensional scale effects on surface enhanced Raman scattering efficiency of self-assembled silver nanoparticle clusters. APPLIED PHYSICS LETTERS, 105(7) [10.1063/1.4893373].
Fasolato, C; Domenici, F; Sennato, S; Mura, F; De Angelis, L; Luongo, F; Costantini, F; Bordi, F; Postorino, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/201496
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