Synthesis of Au-silica core-shell particles by sol-gel process

Y. Kobayashi, H. Inose, T. Nakagawa, K. Gonda, M. Takeda, N. Ohuchi, A. Kasuya

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

This paper describes an amine free sol-gel method for silica coating of Au nanoparticles and shows an X-ray image of a colloid solution of the silica coated Au (Au-SiO 2) particles. The Au nanoparticles that had a size of 16·9±1·2 nm were prepared through a conventional citrate reduction method. The silica coating was performed with a sol-gel reaction of tetraethylorthosilicate (TEOS) catalysed with NaOH in the presence of Au nanoparticles. The silica shell thickness was varied from 37 to 68 nm for TEOS concentrations of 1×10 -3-20×10 -3M at 4·3×10 -5M of Au, 10·7M of H 2O and 1·0×10 -3M of NaOH. The optical properties of the Au-SiO 2 particle colloid solution were related to the refractive index around the Au particles and the intensity of scattering from silica shells. The as prepared colloid solution could be concentrated up to an Au concentration of 4·3·10 -2M with salting out. The concentrated colloid solution showed a high contrast X-ray image.

Original languageEnglish
Pages (from-to)129-133
Number of pages5
JournalSurface Engineering
Volume28
Issue number2
DOIs
Publication statusPublished - 2012 Mar

Keywords

  • Coating
  • Core-shell
  • Gold
  • Nanoparticle
  • Seeded polymerisation
  • Silica
  • Sol-gel
  • Stöber method
  • Surface plasmon resonance

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Synthesis of Au-silica core-shell particles by sol-gel process'. Together they form a unique fingerprint.

Cite this