Green synthesis and characterization of size tunable silica-capped gold core-shell nanoparticles

Nishima Wangoo*, Gajendra Shekhawat, Jin Song Wu, Aman K K Bhasin, C. R. Suri, K. K. Bhasin, Vinayak Dravid

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Silica-coated gold nanoparticles (AuSiO2) with controlled silica-shell thickness were prepared by a modified Stober's method using 10-nm gold nanoparticles (AuNPs) as seeds. The AuNPs were silica-coated with a sol-gel reaction using tetraethylorthosilicate (TEOS) as a silica source and ammonia as a catalyst. An increase in TEOS concentration resulted in an increase in shell thickness. The NPs were characterized by transmission electron microscopy, selected area electron diffraction, energy-dispersive X-ray spectroscopy, scanning near-field ultrasound holography and scanning transmission electron microscopy. The method required no surface modification and the synthesized core shell nanoparticles can be used for various types of biological applications.

Original languageEnglish (US)
Article number1011
JournalJournal of Nanoparticle Research
Volume14
Issue number8
DOIs
StatePublished - Aug 2012

Keywords

  • Amino acid
  • Core shell
  • Gold nanoparticles
  • Silica
  • Sol-gel

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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