Emulsions-directed assembly of gold nanoparticles to molecularly-linked and size-controlled spherical aggregates

Research output: Contribution to journalArticle

Abstract

Aggregation of gold nanoparticles into soluble spherical assemblies using bi-functional ligands i.e., dithiols has recently been demonstrated but with limited control over the size of such assemblies. Herein, we report a new approach to further control the size of water dispersible spherical assemblies by confining gold nanoparticles in tiny oil droplets in water (oil-in-water emulsions) followed by their cross-linking with alkanedithiols. By controlling the size of the oil droplets and the concentration of nanoparticles, the size of spherical aggregates can be controlled from 20 to 400 nm. Cryo-TEM micrographs confirm the formation of covalently-linked soluble spherical nanoparticle assemblies within the oil emulsions in water. Such size-controlled nanoparticle assemblies may have several potential applications including those in gas sensors, controlled delivery, and optical coatings. (C) 2010 Elsevier Inc. All rights reserved.

Details

Authors
  • Irshad Hussain
  • Haifei Zhang
  • Mathias Brust
  • Justas Barauskas
  • Andrew I. Cooper
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry

Keywords

  • Gold nanoparticles, Emulsions-directed assembly, Porous nanospheres
Original languageEnglish
Pages (from-to)368-372
JournalJournal of Colloid and Interface Science
Volume350
Issue number1
Publication statusPublished - 2010
Publication categoryResearch
Peer-reviewedYes