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  • Title: Tug-of-war in nanoparticles: competitive growth of Au on Au-Fe3O4 nanoparticles.
    Author: Wang C, Wei Y, Jiang H, Sun S.
    Journal: Nano Lett; 2009 Dec; 9(12):4544-7. PubMed ID: 19842692.
    Abstract:
    Mechanical property of dumbbell-like Au-Fe(3)O(4) nanoparticles (NPs) is investigated from a synthetic point of view by overgrowing Au(2) on the Au(1)-Fe(3)O(4) NPs. The competitive growth of Au(2) on the preformed Au(1)-Fe(3)O(4) NPs induced an interesting "tug-of-war" between Au(2) and Fe(3)O(4) in the formed Au(2)-Au(1)-Fe(3)O(4) ternary nanostructure. An interpretation of the observed phenomena is proposed based on a mechanical analysis of the stress and strain distribution across the nanoparticle, which is further verified by control experiments with particle size tuned.
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