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Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles
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Published on: July 5, 2016

Three-dimensional atomic imaging of colloidal core-shell nanocrystals.

Sara Bals1, Marianna Casavola, Marijn A van Huis

  • 1EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium. Sara.Bals@ua.ac.be

Nano Letters
|July 27, 2011
PubMed
Summary
This summary is machine-generated.

We present a 3D atomic-scale characterization of lead selenide (PbSe) core-shell cadmium selenide (CdSe) nanocrystals. This provides insights into cation exchange processes crucial for synthesizing advanced colloidal heteronanocrystals.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Colloidal core-shell semiconductor nanocrystals are vital optoelectronic materials.
  • Exciton wave functions are tunable via core, interfacial layers, and shell configurations.

Purpose of the Study:

  • To provide a 3D atomic-scale characterization of PbSe(core)-CdSe(shell) nanocrystals.
  • To offer insights into the cation exchange synthesis process for core-shell nanocrystals.

Main Methods:

  • Utilized a combination of electron microscopy and discrete tomography.
  • Performed atomic-scale 3D characterization of free-standing nanocrystals.

Main Results:

  • Achieved a trustful 3D atomic-scale structural analysis of PbSe-CdSe core-shell nanocrystals.
  • Gained unique insights into the cation exchange mechanism.

Conclusions:

  • The presented methodology is applicable to a wide range of colloidal heteronanocrystals.
  • This work advances the understanding and synthesis of technologically important heteronanocrystals.