Control of Nanoparticle Aggregation

  • Author: Jonathan Faiz
  • Published Date: 18 July 2012
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: Control of Nanoparticle Aggregation

Researchers from the Weizmann Institute of Science, Israel, have made a systematic study to show that the aggregation and optical properties of gold nanoparticle assemblies are dependent on the nature of the organic cross-linkers and the compounds used to cap the gold nanoparticles.

Milko van der Boom and co-workers compared the formation of nanoparticle assemblies of citrate- and tetraoctylammonium bromide (TOAB) capped nanoparticles in water and in toluene, respectively. Two organic cross-linkers that comprise two vinylpyridine rings bridged by either an arene or fluorinated arene unit were used.

UV/Vis and transmission electron microscopy (TEM) studies showed that the citrate capped nanoparticles with the nonfluorinated cross-linker in water and the TOAB-capped nanoparticles with the fluorinated cross-linker in toluene underwent the highest degree of aggregation. Electronic factors, including the electronic structure of the cross-linker, and/or hydrophobic interactions are thought to play a role in the overall aggregation process.

Image: © Wiley-VCH

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