Alloyed copper chalcogenide nanoplatelets via partial cation exchange reactions

Vladimir Lesnyak*, Chandramohan George, Alessandro Genovese, Mirko Prato, Alberto Casu, S. Ayyappan, Alice Scarpellini, Liberato Manna

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

We report the synthesis of alloyed quaternary and quinary nanocrystals based on copper chalcogenides, namely, copper zinc selenide-sulfide (CZSeS), copper tin selenide-sulfide (CTSeS), and copper zinc tin selenide-sulfide (CZTSeS) nanoplatelets (NPLs) (∼20 nm wide) with tunable chemical composition. Our synthesis scheme consisted of two facile steps: i.e., the preparation of copper selenide-sulfide (Cu 2-x Se y S 1-y ) platelet shaped nanocrystals via the colloidal route, followed by an in situ cation exchange reaction. During the latter step, the cation exchange proceeded through a partial replacement of copper ions by zinc or/and tin cations, yielding homogeneously alloyed nanocrystals with platelet shape. Overall, the chemical composition of the alloyed nanocrystals can easily be controlled by the amount of precursors that contain cations of interest (e.g., Zn, Sn) to be incorporated/alloyed. We have also optimized the reaction conditions that allow a complete preservation of the size, morphology, and crystal structure as that of the starting Cu 2-x Se y S 1-y NPLs. The alloyed NPLs were characterized by optical spectroscopy (UV-vis-NIR) and cyclic voltammetry (CV), which demonstrated tunability of their light absorption characteristics as well as their electrochemical band gaps.

Original languageEnglish (US)
Pages (from-to)8407-8418
Number of pages12
JournalACS Nano
Volume8
Issue number8
DOIs
StatePublished - Jan 1 2014

Keywords

  • alloys
  • band gap engineering
  • cation exchange
  • copper chalcogenides
  • cyclic voltammetry
  • nanocrystals

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint

Dive into the research topics of 'Alloyed copper chalcogenide nanoplatelets via partial cation exchange reactions'. Together they form a unique fingerprint.

Cite this