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Spherical Aberration Corrected Z-STEM Characterization of CdSe and CdSe/ZnS Nanocrystals

Published online by Cambridge University Press:  21 March 2011

James McBride ,
Tadd C. Kippeny ,
Stephen J. Pennycook  and
Sandra J. Rosenthal
James McBride
Affiliation:
Vanderbilt University, Nashville TN, 37235, U.S.A
Tadd C. Kippeny
Affiliation:
Vanderbilt University, Nashville TN, 37235, U.S.A
Stephen J. Pennycook
Affiliation:
Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.
Sandra J. Rosenthal
Affiliation:
Vanderbilt University, Nashville TN, 37235, U.S.A
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Abstract

Spherical aberration corrected Atomic Number Contrast Scanning Electron Microscopy (Z-STEM) has recently demonstrated an amazing ability to not only obtain sub-angstrom levels of detail but also yield chemical information at that level as well. With an optimal probe size of 0.8 Å, extremely detailed images of CdSe nanocrystals were obtained showing the lattice structure and surface morphology. As an example of the usefulness of this technique, a sample of CdSe nanocrystals prepared using trioctylphosphine oxide (TOPO) as the surfactant was compared to a sample of CdSe prepared using a mixture of TOPO and hexadecylamine (HDA) as the surfactant. The TOPO/HDA nanocrystals exhibit a narrower size distribution and several orders of magnitude greater fluorescence compared to that of the TOPO only nanocrystals. Interestingly, the Z-STEM images show a striking difference in nanocrystal morphology as the result of the addition of HDA to the reaction mixture. This result suggests surface morphology can be tuned through judicious choice of surfactant. A second example of Z- STEM imaging involves the characterization of CdSe/ZnS core/shell nanocrystals. The mass contrast afforded by Z-STEM can easily distinguish between core and shell.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 818: Symposium M – Nanoparticles and Nanowire Building Blocks-Synthesis, Processing, Characterization and Theory , 2004 , M8.15.1
Copyright
Copyright © Materials Research Society 2004

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