SERS active Ag–SiO2 nanoparticles obtained by laser ablation of silver in colloidal silica

Highly stable Ag–SiO2 nanoparticle composites were first obtained by laser ablation of a silver target in an aqueous colloidal dispersion of silica and examined by UV–vis absorption spectroscopy, transmission electron microscopy and Raman spectroscopy. The surface enhanced Raman scattering (SERS) ac...

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Bibliographic Details
Published in:Beilstein journal of nanotechnology 2018, Vol.9 (1), p.2396-2404
Main Authors: Gellini, Cristina, Muniz-Miranda, Francesco, Pedone, Alfonso, Muniz-Miranda, Maurizio
Format: Article
Language:English
Subjects:
2,2’-bipyridine
Adatoms
Adsorption
Coordination compounds
DFT
Dioxins
Fourier transforms
Full Research Paper
Laser ablation
Lasers
Ligands
Nanocomposites
Nanoparticles
Nanoscience
Nanotechnology
PCB
Pesticides
Polychlorinated biphenyls
Polycyclic aromatic hydrocarbons
Raman spectra
Raman spectroscopy
silica
Silicon dioxide
Silver
Transmission electron microscopy
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Summary:Highly stable Ag–SiO2 nanoparticle composites were first obtained by laser ablation of a silver target in an aqueous colloidal dispersion of silica and examined by UV–vis absorption spectroscopy, transmission electron microscopy and Raman spectroscopy. The surface enhanced Raman scattering (SERS) activity of these nanocomposites was tested using 2,2’-bipyridine as a molecular reporter and excitation in the visible and near-IR spectral regions. The computational DFT approach provided evidence of ligand adsorption on positively charged adatoms of the silver nanostructured surface, in a very similar way to the metal/molecule interaction occurring in the corresponding Ag(I) coordination compound.
ISSN:2190-4286
2190-4286
DOI:10.3762/bjnano.9.224