Direct imaging of core-shell structure in silver-gold bimetallic nanoparticles
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Colleges, School and Institutes
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. (c) 2005 American Institute of Physics.
|Number of pages||1|
|Journal||Applied Physics Letters|
|Publication status||Published - 1 Jan 2005|