Colloidal Cu2-x(SySe1-y) alloy nanocrystals with controllable crystal phase: Synthesis, plasmonic properties, cation exchange and electrochemical lithiation

Enrico Dilena, Dirk Dorfs, Chandramohan George, Karol Miszta, Mauro Povia, Alessandro Genovese, Alberto Casu, Mirko Prato, Liberato Manna*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

We report synthetic routes to both cubic and hexagonal phase Cu 2-x(SySe1-y) alloy nanocrystals exhibiting a well-defined near-infrared valence band plasmon resonance, the spectral position of which is dependent mainly on x, i.e. on Cu stoichiometry, and to a lesser extent on the crystal phase of the NCs. For cubic Cu2-x(S ySe1-y) nanocrystals y could be varied in the 0.4-0.6 range, while for hexagonal nanocrystals y could be varied in the 0.3-0.7 range. Furthermore, the Cu2-x(SySe1-y) nanocrystals could be transformed into the corresponding Cd-based alloy nanocrystals with comparable SySe1-y stoichiometry, by cation exchange. The crystal phase of the resulting Cd(SySe1-y) nanocrystals was either cubic or hexagonal, depending on the phase of the starting nanocrystals. One sample of cubic Cu2-x(SySe 1-y) nanocrystals, with S0.5Se0.5 chalcogenide stoichiometry, was then evaluated as the anode material in Li-ion batteries. The nanocrystals were capable of undergoing lithiation/delithiation via a displacement/conversion reaction (Cu to Li and vice versa) in a partially reversible manner.

Original languageEnglish (US)
Pages (from-to)13023-13031
Number of pages9
JournalJournal of Materials Chemistry
Volume22
Issue number26
DOIs
StatePublished - Jul 14 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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