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Colloidal Synthesis and Characterization of Optically Active ZnO/ZnS Core/Shell Nanocrystals

Published online by Cambridge University Press:  01 February 2011


Krishnaprasad Sankar
Affiliation:
osinski@chtm.unm.edu, University of New Mexico, Center for High Technology Materials, 1313 Goddard SE, Albuquerque, NM, 87106-4343, United States, (505) 272-7812, (505) 272-7801
Brian A. Akins
Affiliation:
bakins@chtm.unm.edu, University of New Mexico, Center for High Technology Materials, 1313 Goddard SE, Albuquerque, NM, 87106-4343, United States
Tosifa A. Memon
Affiliation:
tmemon@unm.edu, University of New Mexico, Center for High Technology Materials, 1313 Goddard SE, Albuquerque, NM, 87106-4343, United States
Nathan J. Withers
Affiliation:
nwithers@chtm.unm.edu, University of New Mexico, Center for High Technology Materials, 1313 Goddard SE, Albuquerque, NM, 87106-4343, United States
Shin T. Bowers
Affiliation:
Shin_Bowers@brown.edu, University of New Mexico, Center for High Technology Materials, 1313 Goddard SE, Albuquerque, NM, 87106-4343, United States
Tingyi Gu
Affiliation:
tgu@unm.edu, University of New Mexico, Center for High Technology Materials, 1313 Goddard SE, Albuquerque, NM, 87106-4343, United States
Jiangjiang Gu
Affiliation:
jjgu@unm.edu, University of New Mexico, Center for High Technology Materials, 1313 Goddard SE, Albuquerque, NM, 87106-4343, United States
Melisa R. Greenberg
Affiliation:
mgreenb@chtm.unm.edu, University of New Mexico, Center for High Technology Materials, 1313 Goddard SE, Albuquerque, NM, 87106-4343, United States
Gennady A. Smolyakov
Affiliation:
gen@chtm.unm.edu, University of New Mexico, Center for High Technology Materials, 1313 Goddard SE, Albuquerque, NM, 87106-4343, United States
Marek Osinski
Affiliation:
osinski@chtm.unm.edu, University of New Mexico, Center for High Technology Materials, 1313 Goddard SE, Albuquerque, NM, 87106-4343, United States

Abstract

ZnO colloidal nanocrystals have been synthesized using two different approaches and characterized by HRTEM, EDS, and photoluminescence spectroscopy. ZnO nanocrystals synthesized from zinc alkoxy alkyl precursors in the MeIm/H2O coordinating solvent showed only visible surface-defect related emission in their PL spectra. No band-to-band UV emission was observed after ZnS coating of those ZnO nanocrystals. In contrast, a strong band-to-band UV emission dominated PL spectra of ZnO nanocrystals synthesized through wet-chemical acid-catalyzed esterification of zinc acetate.


Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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