A dewetting route to grow heterostructured nanoparticles based on thin film heterojunctions

Junjie Li, Deqiang Yin, Qiang Li, Chunlin Chen, Sumei Huang, Zhongchang Wang

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Heterostructured nanoparticles have received considerable attention for their various applications due to their unique and tunable functionalities with respect to their individual bulk constituents. However, the current wet chemical synthesis of multicomponent heterostructured nanoparticles is rather complicated. Here, we report a simple and quick method to fabricate Co-Au dumbbell arrays by dewetting Co/Au heterojunctions on a Si substrate and demonstrate that the Co-Au dumbbells vary in size from 2 to 28 nm. We further show by chemical mapping that Co bells are covered by a pseudomorphic Au wetting layer of ∼4 Å, preventing the bells from oxidation. By controlling the thickness of metal heterojunctions and the annealing time, the morphology of the Co-Au nanoparticle is found to be transformed from the dumbbell to the core shell. This facile route is demonstrated to be useful for fabricating other metal-metal and metal-oxide heterostructures and hence holds technological promise for functional applications.

    Original languageEnglish
    Pages (from-to)19977-19984
    Number of pages8
    JournalNanoscale
    Volume7
    Issue number47
    DOIs
    Publication statusPublished - 2015 Dec 21

    ASJC Scopus subject areas

    • Materials Science(all)

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