Silicon dioxide covered Au and Ag nanoparticles for shell-isolated nanoparticle enhanced spectroscopies in the near-infrared

The present work reports the extension of the SHINERS and SHINEF (shell-isolated nanoparticles enhanced Raman scattering, and fluorescence, respectively) effects into the near-infrared excitation, at 1064 nm and 785 nm, respectively. Plasmon enhanced effects were obtained for the SHIN Au@SiO 2 and A...

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Bibliographic Details
Published in:RSC advances 2015-01, Vol.5 (73), p.59373-59378
Main Authors: Neves, Tatiana B. V, Landi, Sandra M, Sena, Lídia A, Archanjo, Bráulio S, Andrade, Gustavo F. S
Format: Article
Language:English
Subjects:
Dyes
Excitation spectra
Nanoparticles
Plasmons
Quality factor
Raman scattering
Similarity
Spectra
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Summary:The present work reports the extension of the SHINERS and SHINEF (shell-isolated nanoparticles enhanced Raman scattering, and fluorescence, respectively) effects into the near-infrared excitation, at 1064 nm and 785 nm, respectively. Plasmon enhanced effects were obtained for the SHIN Au@SiO 2 and Ag@SiO 2 nanoparticles. The overall SHINERS performance of both SHIN in the presence of the probe dye IR-820 is considerably lower than for the visible region of the spectra, and the conjunction to the IR-820 dye has been essential for the observation of SHINERS. The SHINEF performance for both SHIN excited at 785 nm is quite similar; this similarity is assigned to the similar values of quality factor for the two coinage metals in that region of the electromagnetic spectrum. SHINERS and SHINEF from Ag@SiO 2 and Au@SiO 2 excited in the near-infrared are presented, with high enhancement factors, together to TEM/EDX evidences of silica coverage over Au and Au nanoparticles.
ISSN:2046-2069
2046-2069
DOI:10.1039/c5ra08969g