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

165 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
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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