Ag-Pt alloy nanoparticles with the compositions in the miscibility gap

Zhenmeng Peng, Hong Yang

Research output: Contribution to journalArticlepeer-review

Abstract

Silver platinum binary alloys with compositions between about Ag2Pt98 and Ag95Pt5 at <∼ 400 °C have largely not been observed in bulk due to the large immiscibility between these two metals. We present in this paper that Ag-Pt alloy nanostructures can be made in a broad composition range. The formation of Ag-Pt nanostructures is studied by powder X-ray diffraction (PXRD) and energy-dispersive X-ray (EDX). Our results indicate that lattice parameter changes almost linearly with composition in these Ag-Pt nanomaterials. In another word, lattice parameter and composition relationship follows the Vegard's law, which is a strong indication for the formation of metal alloys. Our transmission electron microscopy (TEM) study shows that the silver-rich Ag-Pt alloy nanostructures have spherical shape, while the platinum-rich ones possess wire-like morphology. The stability and crystal phase are investigated by annealing the alloy nanostructures directly or on carbon supports.

Original languageEnglish (US)
Pages (from-to)1546-1551
Number of pages6
JournalJournal of Solid State Chemistry
Volume181
Issue number7
DOIs
StatePublished - Jul 1 2008
Externally publishedYes

Keywords

  • Ag-Pt alloy
  • Miscibility gap
  • Nanoparticle
  • Nanowire
  • Phase segregation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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