Colloidal Nanoparticles of a Metastable Copper Selenide Phase with Near-Infrared Plasmon Resonance

Robert W. Lord, Julian Fanghanel, Cameron F. Holder, Ismaila Dabo, Raymond Edward Schaak

Research output: Contribution to journalArticlepeer-review

Abstract

Copper selenide nanoparticles are important materials with desirable properties for a broad scope of applications. Copper selenides are additionally known to adopt several different crystal structures and compositions. Here, we report the direct solution-phase synthesis of colloidal Cu2-xSe nanoparticles that adopt a structure distinct from other known copper selenide phases. This Cu2-xSe phase was determined to be structurally related to weissite Cu2-xTe, which is a layered compound containing alternating Cu-rich and Cu-deficient layers sandwiching distorted hexagonal layers of chalcogen atoms. When the weissite-like Cu2-xSe nanoparticles were annealed in solution, they converted to the more stable cubic berzelianite phase, indicating that they are metastable. Optical characterization of the weissite-like Cu2-xSe nanoparticles showed a broad plasmon absorption band centered around 1550 nm, and the position of this absorption band shifted only slightly when subjected to reductive and oxidative conditions.

Original languageEnglish (US)
Pages (from-to)10227-10234
Number of pages8
JournalChemistry of Materials
Volume32
Issue number23
DOIs
StatePublished - Dec 8 2020

All Science Journal Classification (ASJC) codes

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

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