TEM characterization of chemically synthesized copper-gold nanoparticles

DT Tran, Ian Jones, Jon Preece, Roy Johnston, CR van den Brom

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Dodecanethiol-capped Cu-Au nanoparticles, synthesized via a successive two-phase (water/toluene) and galvanic-exchange procedure, were characterized using transmission electron microscopy (TEM). The size range of the particles is around 1-7 nm. Electron-induced morphological evolution was observed under high resolution (HR) TEM. Cuboctahedral morphology was found to be thermodynamically stable. Electron-induced aggregation of two particles was also observed. Chemical ordering of cuboctahedral particles was studied by atomic-resolution high angle annular dark field (HAADF) imaging in scanning TEM (STEM) mode and energy dispersive X-ray (EDX) element mapping using a silicon drift detector (SDD). The particles were found to be Cu-Au mixed, and to be stable in air. Surface plasmon resonance (SPR), which is dependent on local structure and morphology, was investigated by electron energy loss spectroscopy (EELS).
Original languageEnglish
Pages (from-to)4229-4237
Number of pages9
JournalJournal of Nanoparticle Research
Volume13
Issue number9
DOIs
Publication statusPublished - 1 Sep 2011

Keywords

  • TEM
  • EELS
  • Copper-gold nanoparticles
  • EDX
  • SDD
  • Catalysts
  • HAADF-STEM
  • HRTEM

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