Solution-Phase Synthesis of Sub-10 nm Au-Ag Alloy Nanoparticles

Michael P. Mallin, Catherine J. Murphy

Research output: Contribution to journalArticlepeer-review


Gold-silver alloy nanoparticles were synthesized via reduction of varying mole fractions of HAuCl4 and AgNO3 by sodium borohydride in the presence of sodium citrate as a capping agent, in water. Solution concentrations were adjusted to avoid the precipitation of AgCl during the course of the reaction. The plasmon absorption band of Ag-Au nanoparticles shifts linearly to the red with increasing Au content. Due to the direct dependence of the metal salt ratio to the shift of the absorbance peak and the lack of an apparent core-shell structure in transmission electron microscope images, it is concluded that the nanoparticles are alloys, rather than core-shell composites.

Original languageEnglish (US)
Pages (from-to)1235-1237
Number of pages3
JournalNano letters
Issue number11
StatePublished - Nov 2002
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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