Synthesis and Characterization of Strongly Luminescing ZnS-Capped CdSe Nanocrystals

Margaret A. Hines and Philippe Guyot-Sionnest*
James Franck Institute, The University of Chicago, Chicago, Illinois 60637
J. Phys. Chem., 1996, 100 (2), pp 468–471
DOI: 10.1021/jp9530562
Publication Date (Web): January 11, 1996
Copyright © 1996 American Chemical Society
*

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

Abstract

We describe the synthesis of ZnS-capped CdSe semiconductor nanocrystals using organometallic reagents by a two-step single-flask method. X-ray photoelectron spectroscopy, transmission electron microscopy and optical absorption are consistent with nanocrystals containing a core of nearly monodisperse CdSe of 27−30 Å diameter with a ZnS capping 6 ± 3 Å thick. The ZnS capping with a higher bandgap than CdSe passivates the core crystallite removing the surface traps. The nanocrystals exhibit strong and stable band-edge luminescence with a 50% quantum yield at room temperature.

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History

  • Published In Issue January 11, 1996
  • Received August 10, 1995
    Revised October 16, 1995

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