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

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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.


  • Irshad Hussain
  • Haifei Zhang
  • Mathias Brust
  • Justas Barauskas
  • Andrew I. Cooper
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Sidor (från-till)368-372
TidskriftJournal of Colloid and Interface Science
Utgåva nummer1
StatusPublished - 2010
Peer review utfördJa