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

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

Research output: Contribution to journalArticle

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Abstract

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.
LanguageEnglish
Article number243103
Number of pages3
JournalApplied Physics Letters
Volume87
Issue number24
DOIs
Publication statusPublished - 12 Dec 2005

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seeds
silver
gold
nanoparticles
electron microscopes
atoms

Keywords

  • electron microscopy
  • nanoparticles
  • gold
  • silver

Cite this

Li, Z.Y. ; Yuan, J. ; Chen, Yu ; Palmer, R.E. ; Wilcoxon, J.P. / Direct imaging of core-shell structure in silver-gold bimetallic nanoparticles. In: Applied Physics Letters. 2005 ; Vol. 87, No. 24.
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Direct imaging of core-shell structure in silver-gold bimetallic nanoparticles. / Li, Z.Y.; Yuan, J.; Chen, Yu; Palmer, R.E.; Wilcoxon, J.P.

In: Applied Physics Letters, Vol. 87, No. 24, 243103, 12.12.2005.

Research output: Contribution to journalArticle

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T1 - Direct imaging of core-shell structure in silver-gold bimetallic nanoparticles

AU - Li, Z.Y.

AU - Yuan, J.

AU - Chen, Yu

AU - Palmer, R.E.

AU - Wilcoxon, J.P.

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KW - gold

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