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.

  • 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:14 Dec 2024 16:04
    URI:https://strathprints.strath.ac.uk/id/eprint/31145
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