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Ripening of Semiconductor Nanoplatelets.

Florian D Ott, Andreas Riedinger, David R Ochsenbein

  • 1Center for Computational Materials Science, Naval Research Laboratory , Washington, DC 20375, United States.

Nano Letters
|October 10, 2017
PubMed
Summary

Semiconductor nanoplatelets exhibit unique Ostwald ripening, where thickness increases in discrete monolayer steps rather than size defocusing. This controlled growth allows for precise thickness manipulation in quasi-2D nanomaterials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Ostwald ripening typically causes particle size distributions to defocus over time.
  • Semiconductor nanoplatelets are quasi-2D nanomaterials with unique thickness properties.

Purpose of the Study:

  • Investigate the counterintuitive non-defocusing thickness distribution during Ostwald ripening in CdSe nanoplatelets.
  • Develop a microscopic model to explain the kinetics and thermodynamics of monomer attachment and detachment.

Main Methods:

  • Microscopic modeling of monomer kinetics and thermodynamics.
  • Simulation of nanoplatelet growth from nucleation through ripening.
  • Optical experiments to track nanoplatelet dimensions during ripening.
Keywords:
Colloidal semiconductor nanoplateletsOstwald ripeninggrowth kineticsnucleation

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Main Results:

  • Observed Ostwald ripening in the lateral dimension but not perpendicular to the surface of CdSe nanoplatelets.
  • Demonstrated that thicker nanoplatelet populations arise from smaller ones dissolving laterally.
  • Thickness distribution jumps sequentially between monolayer thicknesses (m to m+1).

Conclusions:

  • The perpendicular thickness of semiconductor nanoplatelets does not defocus during ripening, enabling precise thickness control.
  • Understanding this unique ripening mechanism is crucial for advancing the synthesis and application of quasi-2D nanomaterials.