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Size- and shape-dependent phase transformations in wurtzite ZnS nanostructures.

Christopher A Feigl1, Amanda S Barnard, Salvy P Russo

  • 1CSIRO Materials Science and Engineering, Private Bag 33, Parkville, VIC 3052, Australia.

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Zinc sulfide nanoparticles in the wurtzite phase are thermodynamically unstable. Nanoparticle shape influences phase transformations to the zinc blende phase, crucial for experimental applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Computational Chemistry

Background:

  • Zinc sulfide nanoparticles are widely synthesized in the wurtzite phase.
  • Existing research lacks in-depth thermodynamic studies on wurtzite phase stability and shape-dependent transformations.
  • The relationship between nanoparticle morphology and phase stability is critical for controlling material properties.

Purpose of the Study:

  • To determine equilibrium morphologies of zinc sulfide nanoparticles in the wurtzite phase.
  • To investigate the influence of size and shape on phase stability.
  • To compare the thermodynamic stability of wurtzite and zinc blende phases in zinc sulfide nanostructures.

Main Methods:

  • Ab initio Density Functional Theory (DFT) simulations.
  • A shape-dependent thermodynamic model to predict Gibbs free energy.
  • Analysis of various nanoparticle shapes based on the wurtzite structure.

Main Results:

  • Wurtzite nanoparticles are thermodynamically unstable compared to the zinc blende phase (rhombic dodecahedron morphology) across all sizes.
  • The aspect ratio of wurtzite nanorods affects the size-dependent phase transformation to the zinc blende phase.
  • Shape- and size-dependent phase transformations occur when other zinc blende morphologies are considered.

Conclusions:

  • Nanoparticle shape is a critical determinant of the solid phase in zinc sulfide nanostructures.
  • This study provides the first thermodynamic framework for understanding shape-driven phase control in zinc sulfide.
  • Findings are vital for experimental applications where zinc sulfide phase and morphology dictate properties.