Octapod-shaped colloidal nanocrystals of cadmium chalcogenides via "one-Pot" cation exchange and seeded growth

Sasanka Deka, Karol Miszta, Dirk Dorfs, Alessandro Genovese, Giovanni Bertoni, Liberato Manna*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    151 Scopus citations

    Abstract

    The growth behavior of cadmium chalcogenides (CdE = CdS, CdSe, and CdTe) on sphalerite Cu2-xSe nanocrystals (size range 10-15 nm) is studied. Due to the capability of Cu2-xSe to undergo a fast and quantitative cation exchange reaction in the presence of excessive Cd2+ ions, no Cu2-xSe/CdE heterostructures are obtained and instead branched CdSe/CdE nanocrystals are built which consist of a sphalerite CdSe core and wurtzite CdE arms. While CdTe growth yields multiarmed structures with overall tetrahedral symmetry, CdS and CdSe arm growth leads to octapod-shaped nanocrystals. These results differ significantly from literature findings about the growth of CdE on sphalerite CdSe particles, which until now had always yielded tetrapod-shaped nanocrystals.

    Original languageEnglish (US)
    Pages (from-to)3770-3776
    Number of pages7
    JournalNano Letters
    Volume10
    Issue number9
    DOIs
    StatePublished - Sep 8 2010

    Keywords

    • Quantum dot
    • heterostructure
    • multipod
    • octapod
    • semiconductor
    • tetrapod

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering

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