Synthesis and characterization of organic-soluble Ag/AgBr dimer nanocrystals

Aaron E. Saunders*, Inna Popov, Uri Banin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Colloidal metal/semiconductor hybrid nanoparticles, containing a Group I-VII semiconductor (AgBr) coupled with a noble metal (Ag), are synthesized in an organic solvent using a single-phase, room-temperature method. Methanol is added to a precursor solution containing silver ions complexed with an alkylammonium bromide surfactant. The methanol appears to cause AgBr precipitation while also acting as a reducing agent for silver ions in solution; the reduced silver clusters grow preferentially onto the AgBr, forming dimer particles that are coated with an alkanethiol to passivate the surface. The structure and composition of the hybrid nanocrystals are studied using TEM and XRD. Surprisingly, despite the relatively broad size distribution of the colloids, the ratio between the diameters of the two domains is approximately constant. This suggests that both portions of the dimer nanocrystal nucleate and grow simultaneously, representing a new type of mechanism for the formation of hybrid nanoparticles.

Original languageAmerican English
Pages (from-to)2414-2419
Number of pages6
JournalZeitschrift fur Anorganische und Allgemeine Chemie
Volume633
Issue number13-14
DOIs
StatePublished - 2007

Keywords

  • Colloids
  • Metal-semiconductor junction
  • Nanocrystals
  • Silver
  • Silver bromide

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