Direct imaging of core-shell structure in silver-gold bimetallic nanoparticles

Z.Y. Li, J. Yuan, Yu Chen, R.E. Palmer, J.P. Wilcoxon

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59 Citations (Scopus)


High-angle annular dark field imaging in the electron microscope has been exploited to reveal the internal structure of monodispersed, bimetallic gold (Au) - silver (Ag) nanoparticles of similar to 4 nm diameter, prepared using a seed-growth wet chemical method and passivated with an organic layer. Starting with a 3 nm Ag seed particle, deposition of Au atoms to a final overall atomic ratio of Ag:Au=1:2 leads to nanoparticles with an Ag-rich core and an Au-rich shell, as expected. If the overall atomic ratio is 2:1, the core/shell structure is not observed. The physical significance of these observations is discussed in terms of the stability of particles of nanoscale dimensions.
Original languageEnglish
Article number243103
Number of pages3
JournalApplied Physics Letters
Issue number24
Publication statusPublished - 12 Dec 2005


  • electron microscopy
  • nanoparticles
  • gold
  • silver


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