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

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number443
JournalSN Applied Sciences
Volume3
Issue number4
DOIs
StatePublished - Apr 2021

Bibliographical note

Publisher Copyright:
© 2021, The Author(s).

Keywords

  • Decorated
  • Gold
  • PEI-coated silica
  • Plasmonic
  • Polyethyleneimine
  • Red-shift

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