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

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Li, Z.Y. and Yuan, J. and Chen, Yu and Palmer, R.E. and Wilcoxon, J.P. (2005) Direct imaging of core-shell structure in silver-gold bimetallic nanoparticles. Applied Physics Letters, 87 (24). 243103. ISSN 0003-6951 (https://doi.org/10.1063/1.2139851)

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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.

ORCID iDs

Li, Z.Y., Yuan, J., Chen, Yu ORCID logoORCID: https://orcid.org/0000-0003-2427-3559, Palmer, R.E. and Wilcoxon, J.P.;
  • Item type:Article
    ID code:31145
    Dates:
    Date
    Event
    12 December 2005
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:01 Jul 2011 10:50
    Last modified:16 Feb 2025 04:30
    URI:https://strathprints.strath.ac.uk/id/eprint/31145
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