The heteroepitaxial growth of the core-shell nanocrystals composed of Pd and Au has been developed. Both Pd nanocubes and Au nanooctahedrons are utilized as cores. The growths of the Au and Pd shells are realized under similar conditions. The preparation is highly controllable, and the epitaxial growth can be repeated by up to three times for both types of cores to yield single-crystalline Pd@Au@Pd@Au and Au@Pd@Au@Pd core-trishell nanocrystals of narrow size distributions. The thickness of each shell can be readily varied by changing the amounts of metal salts. The plasmon of the nanocrystals terminated with the Pd shells is suppressed, while it is recovered upon the growth of the Au shells. Our growth method can potentially be extended to other metals for the synthetic design of more complex core-multishell metal nanostructures with desirable optical, catalytic, and magnetic properties. Schematic showing of the step-by-step growth.SEM and HAADF images.

Step-by-step heteroepitaxial growth of Pd@Au@Pd@Au and Au@Pd@Au@Pd core-multishell nanocrystals

240th National Meeting (2010)

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