Synthesis of colloidal Au-Cu 2S heterodimers via chemically triggered phase segregation of aucu nanoparticles

Nathan E. Motl, James F. Bondi, Raymond E. Schaak

Research output: Contribution to journalArticle

65 Scopus citations

Abstract

Uniform colloidal AuCu alloy nanoparticles were shown to react with dissolved sulfur and bubbling oxygen to form uniform colloidal hybrid Au-Cu 2S nanoparticles. Representative transmission electron microscopy (TEM) images of the Au-Cu 2S product show that the AuCu nanoparticles are uniform and spherical with an average diameter of 10 ∓ 1 nm, while the product nanoparticles appear biphasic. The XRD data implies that the dark-contrast component is predominantly Au, perhaps with a small amount of alloyed Cu. The Cu signal does not disappear in the Au region, which could originate from an overlapping Ni signal or indicate that a small amount of Cu remains alloyed with the Au. The relative sizes of the Au and Cu 2S components in the Au-Cu 2S heterodimers are also consistent with a phase segregation pathway.

Original languageEnglish (US)
Pages (from-to)1552-1554
Number of pages3
JournalChemistry of Materials
Volume24
Issue number9
DOIs
StatePublished - May 8 2012

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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