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

• Autores: Félix L.L., Porcel J.M., Aragón F.F.H., Pacheco-Salazar D.G., Sousa M.H.
• Formato: artículo
• Fecha de Publicación: 2021
• Institución: Consejo Nacional de Ciencia Tecnología e Innovación
• Repositorio: CONCYTEC-Institucional
• Lenguaje: inglés
• OAI Identifier: oai:repositorio.concytec.gob.pe:20.500.12390/2345
• Enlace del recurso: https://hdl.handle.net/20.500.12390/2345; https://doi.org/10.1007/s42452-021-04456-0
• Nivel de acceso: acceso abierto
• Materia: Red-shift; Decorated; Gold; PEI-coated silica; Plasmonic; Polyethyleneimine; http://purl.org/pe-repo/ocde/ford#2.10.01

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.