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
2021 SN Applied Sciences  
AbstractWe 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
more » ... h 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.
doi:10.1007/s42452-021-04456-0 fatcat:fbzdljxcmjeqpekyvzyx67tkyq