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Truncated octahedral (TO) Ag nanoparticles are subjected to a replacement reaction with HAuCl4, where they undergo a series of morphological changes to transform into Ag@AgAu metal core/alloy shell nanoparticles (see image). In the final stage, atomic rearrangement occurrs to restore the bimetallic particles to the initial TO shape.
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Zhang et al. (2008) studied this question.
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