Silica coating of silver nanoparticles using a modified Stöber method

Yoshio Kobayashi, Hironori Katakami, Eiichi Mine, Daisuke Nagao, Mikio Konno, Luis M. Liz-Marzán

Research output: Contribution to journalArticlepeer-review

264 Citations (Scopus)

Abstract

Silver nanoparticles prepared through a borohydride-reduction method were directly coated with silica by means of a seeded polymerization technique based on the Stöber method. Various amine catalysts were used for initialization of a sol-gel reaction of TEOS with no need for a prior surface modification. Use of dimethylamine (DMA) as a catalyst was found to be necessary to obtain a proper coating. The silica shell thickness was varied from 28 to 76 nm for TEOS concentrations of 1-15 mM at 11.1 M water and 0.8 M DMA. The optical spectra of the core-shell silver-silica composite particles show a qualitative agreement with predictions by Mie theory.

Original languageEnglish
Pages (from-to)392-396
Number of pages5
JournalJournal of Colloid And Interface Science
Volume283
Issue number2
DOIs
Publication statusPublished - 2005 Mar 15

Keywords

  • Coating
  • Core-shell
  • Mie theory
  • Nanoparticle
  • Seeded polymerization
  • Silica
  • Silver
  • 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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