Direct coating of gold nanoparticles with silica by a seeded polymerization technique

Eiichi Mine, Akira Yamada, Yoshio Kobayashi, Mikio Konno, Luis M. Liz-Marzán

Research output: Contribution to journalArticlepeer-review

160 Citations (Scopus)

Abstract

Gold nanoparticles prepared through a conventional citrate-reduction method were directly coated with silica by means of a seeded polymerization technique based on the Stöber method. The method required no surface modification. The addition of tetraethylorthosilicate and water prior to ammonia was found to be critical to obtain a proper coating. The silica shell thickness was varied from 30 to 90 nm for TEOS concentrations of 0.0005-0.02 M at 10.9 M of water and 0.4 M of ammonia. The optical spectra of the core-shell gold-silica composite particles agreed with predictions of Mie theory.

Original languageEnglish
Pages (from-to)385-390
Number of pages6
JournalJournal of Colloid And Interface Science
Volume264
Issue number2
DOIs
Publication statusPublished - 2003 Aug 15

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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