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Characterization of Shell Material on Colloidal CdSe/ZnS Quantum Dots

Published online by Cambridge University Press:  21 March 2011

Zhiheng Yu ,
Li Guo ,
Hui Du ,
Todd Krauss  and
John Silcox
Zhiheng Yu
Affiliation:
Physics Department, Cornell University, Ithaca, NY 14853
Li Guo
Affiliation:
Chemistry Department, University of Rochester, Rochester, NY 14627
Hui Du
Affiliation:
Chemistry Department, University of Rochester, Rochester, NY 14627
Todd Krauss
Affiliation:
Chemistry Department, University of Rochester, Rochester, NY 14627
John Silcox
Affiliation:
School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853
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Abstract

Scanning transmission electron microscopy (STEM) coupled with electron energy loss spectroscopy (EELS) was used to determine the distribution of ZnS shell material on colloidal core-shell CdSe/ZnS quantum dots (QDs). A sub-nm electron probe was placed at various locations on core-shell QDs to ascertain the chemical distribution of the shell material. While a definite shell of ZnS was detected surrounding the CdSe core, the integrated EELS signals from positions around the QD suggest the distribution of the shell material may not be uniform. A non-uniform shell implies a reduced quality of the QD surface passivation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 818: Symposium M – Nanoparticles and Nanowire Building Blocks-Synthesis, Processing, Characterization and Theory , 2004 , M6.8.1
Copyright
Copyright © Materials Research Society 2004

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