Can the Morphology of Biconcave Metal Sulfide Nanoplatelets Be Preserved during Cation Exchange?

Yang Liu, Chang Keun Lim, Zheng Fu, Deqiang Yin, Mark T. Swihart

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Cation exchange (CE) has become a central strategy for preparing many previously unavailable semiconductor nanocrystals (NCs). However, general understanding of mechanisms governing morphology preservation or evolution upon CE reaction remains limited. In this study, we carried out CE starting from biconcave Cu1.94S nanoplatelet (NPl) templates, whose relatively complex structure both provides opportunities to lower overall surface energy by shape evolution and facilitates observation of any shape evolution that occurs. From these templates, we prepared NCs of binary and ternary metal sulfides including CdS, ZnS, CuInS2, MnS, SnS, PbS, and SnS2. This study reveals that preservation of the template morphology depends upon compatibility of the anionic sublattices (hcp vs fcc) of the template and final product and produces biconcave NPls of several compositions for which this morphology has not previously been reported. In addition, we probed the morphology-dependent optical responses of different anisotropic CdS nanostructures produced by this approach, providing insight into the optical properties of a previously unreported morphology of CdS.

Original languageEnglish
Pages (from-to)5706-5712
Number of pages7
JournalChemistry of Materials
Issue number15
Publication statusPublished - Aug 13 2019
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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