Reverse microemulsion-mediated synthesis of silica-coated gold and silver nanoparticles

Yu Han, Jiang Jiang, Su Seong Lee, Jackie Y. Ying

Research output: Contribution to journalArticlepeer-review

192 Scopus citations


A reverse microemulsion method is reported for preparing monodispersed silica-coated gold (or silver) nanoparticles without the use of a silane coupling agent or polymer as the surface primer. This method enables a fine control of the silica shell thickness with nanometer precision. As compared to the Stöber method reported for direct silica coating, which can only coat large gold particles (∼50 nm in diameter) at low concentrations (<1.5 × 1010 particles/mL), this new approach is capable of coating gold particles of a wide range of sizes (from 10 to 50 nm) at a much higher concentration (∼1.5 × 1013 particles/mL). Moreover, it enables straightforward surface functionalization via co-condensation between tetraethyl orthosilicate and another silane with the desired functional groups. The functional groups introduced by this method are readily accessible and thus useful for various applications.

Original languageEnglish (US)
Pages (from-to)5842-5848
Number of pages7
Issue number11
StatePublished - Jun 3 2008

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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