Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/330095
Type: Artigo
Title: Size Control Of Silver-core/silica-shell Nanoparticles Fabricated By Laser-ablation-assisted Chemical Reduction
Size control of silver-core/silica-shell nanoparticles fabricated by laser-ablation-assisted chemical reduction
Author: Ermakov, V. A.
Jimenez-Villar, E.
Silva Filho, J.M.C.
Yassitepe, E.
Mogili, N.V.V.
Iikawa, F.
Sa, G.F.
Cesar, C.L
Marques, F.C.
Abstract: Aqueous colloidal silver nanoparticles have substantial potential in biological application as markers and antibacterial agents and in surface-enhanced Raman spectroscopy applications. A simple method of fabrication and encapsulation into an inert shell is of great importance today to make their use ubiquitous. Here we show that colloids of silver-core/silica-shell nanoparticles can be easily fabricated by a laser-ablation-assisted chemical reduction method and their sizes can be tuned in the range of 2.5 to 6.3 nm by simply choosing a proper water ethanol proportion. The produced silver nanoparticles possess a porous amorphous silica shell that increases the inertness and stability of colloids, which decreases their toxicity compared with those without silica. The presence of a thin 2 to 3 nm silica shell was proved by EDX mapping. The small sizes of nanoparticles achieved by this method were analyzed using optical techniques, and they show typical photoluminescence in the UV-vis range that shifts toward higher energies with decreasing size.
Aqueous colloidal silver nanoparticles have substantial potential in biological application as markers and antibacterial agents and in surface-enhanced Raman spectroscopy applications. A simple method of fabrication and encapsulation into an inert shell is of great importance today to make their use ubiquitous. Here we show that colloids of silver-core/silica-shell nanoparticles can be easily fabricated by a laser-ablation-assisted chemical reduction method and their sizes can be tuned in the range of 2.5 to 6.3 nm by simply choosing a proper water ethanol proportion. The produced silver nanoparticles possess a porous amorphous silica shell that increases the inertness and stability of colloids, which decreases their toxicity compared with those without silica. The presence of a thin 2 to 3 nm silica shell was proved by EDX mapping. The small sizes of nanoparticles achieved by this method were analyzed using optical techniques, and they show typical photoluminescence in the UV-vis range that shifts toward higher energies with decreasing size.
Subject: Nanopartículas metálicas
Nanopartículas de ouro
Filmes finos
Fluorescência
Country: Estados Unidos
Editor: American Chemical Society
Citation: Langmuir. Amer Chemical Soc, v. 33, p. 2257 - 2262, 2017.
Rights: fechado
Identifier DOI: 10.1021/acs.langmuir.6b04308
Address: https://pubs.acs.org/doi/abs/10.1021/acs.langmuir.6b04308
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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