Simple synthesis of gold-decorated silica nanoparticles by in situ precipitation method with new plasmonic properties

Lizbet León Félix, Joaquin Martinez Porcel, Fermín Fidel Herrera Aragón, David Gregorio Pacheco Salazar, Marcelo Henrique Sousa

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

Resumen

We describe a simple method for the preparation of gold-decorated silica (SiO2) nanoparticles (NPs) by the in situ precipitation method using simple BH4 ions reduction as a procedure, where BH4 ions are adsorbed onto PEI-functionalized SiO2 NPs for stabilizing and reducing gold ions onto PEI-SiO2 surface in water under ambient conditions. The result was 3-nm gold nanoshell NPs attached to SiO2 core (~ 75 nm) with a surface plasmon resonance (SPR) at ~ 680 nm. SPR band is associated with Au NP aggregates that arise from strong interparticle interaction. This is an alternative to the gold-seeding methods and the use of anionic gold species for the obtention of gold-decorated SiO2 NPs with an important red-shift in UV–Vis absorption and with potential applications in biosensors and photothermal therapy.

Idioma originalInglés
Número de artículo443
PublicaciónSN Applied Sciences
Volumen3
N.º4
DOI
EstadoPublicada - abr. 2021

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