Artículos de revistas
Size Control Of Silver-core/silica-shell Nanoparticles Fabricated By Laser-ablation-assisted Chemical Reduction
Registro en:
Langmuir. Amer Chemical Soc, v. 33, p. 2257 - 2262, 2017.
0743-7463
WOS:000395964100021
10.1021/acs.langmuir.6b04308
Autor
Ermakov
Victor A.; Jimenez-Villar
Ernesto; Clemente da Silva Filho
Jose Maria; Yassitepe
Emre; Vardhan Mogili
Naga Vishnu; Iikawa
Fernando; de Sa
Gilberto Fernandes; Cesar
Carlos Lenz; Marquest
Francisco Chagas
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) 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. 33 9 2257 2262 FAPESP [2013/26385-6, 08/57906-3, 2012/10127-5] FACEPE [0116-1.06/13, APQ0071-1.06/14] CNPq [573913/2008-0, 407887/2013-0] Biologia das Doencas Neoplasicas da Medula Ossea (FAPESP) [11/51959-0] Bolsa de Produtividade (CNPq) [312049/2014-5] Centro de Optica e Fotonica CEPOF (FAPESP) [05/51689-2] INES/INCT/CNPq [465423/2014-0] CAPES Lamult/IFGW/Unicamp Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)