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Aqueous synthesis of CdSe and CdSe/CdS quantum dots with controllable introduction of Se and S sources

Authors
Journal
Chinese Chemical Letters
1001-8417
Publisher
Elsevier
Volume
23
Issue
8
Identifiers
DOI: 10.1016/j.cclet.2012.05.029
Keywords
  • Cdse
  • Cdse/Cds
  • Quantum Dots
  • Aqueous Synthesis
  • Gaseous Precursors
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract A new and convenient route is developed to synthesize CdSe and core–shell CdSe/CdS quantum dots (QDs) in aqueous solution. The gaseous precursors, H2Se and H2S, generated on-line by reducing SeO32− with NaBH4 and the reaction between Na2S and diluted H2SO4, are used to form high-quality CdSe and CdSe/CdS QDs, respectively. The synthesized water-soluble CdSe and CdSe/CdS QDs possess high quantum yield (3% and 20%) and narrow full-width-at-half-maximum (43nm and 38nm). The synthesis process is easily reproducible with simple apparatus and low-toxic chemicals, and can be readily extended to the large-scale aqueous synthesis of QDs.

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