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Strain-Mediated Interfacial Dynamics during Au-PbS Core-Shell Nanostructure Formation.

Kai-Yang Niu1, Miao Liu2, Kristin A Persson2

  • 1Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States.

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|May 24, 2016
PubMed
Summary
This summary is machine-generated.

We observed lead sulfide (PbS) growth on gold (Au) nanorods, revealing preferential nucleation at the ends and significant Au nanorod shrinkage due to sulfidation. Wavy interfaces suggest reversible gold-sulfidation phase transitions.

Keywords:
core−shell nanostructuregold nanorodheterogeneous growthinterfacial strainliquid cell TEM

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Hierarchical nanostructure formation is crucial for designing advanced functional materials.
  • Understanding core-shell nanoparticle growth dynamics informs material property tuning.

Purpose of the Study:

  • To investigate the in situ formation of lead sulfide (PbS) shells on gold (Au) nanorod seeds.
  • To elucidate the nucleation and growth mechanisms of Au-PbS core-shell nanoparticles.

Main Methods:

  • Liquid cell transmission electron microscopy (TEM) for in situ observation.
  • Density Functional Theory (DFT) calculations for interface analysis.

Main Results:

  • Preferential heterogeneous nucleation of PbS observed at the ends of Au nanorods.
  • Significant sulfidation of Au nanorods occurred during PbS shell growth, causing up to 50% volume shrinkage.
  • Intriguing wavy interfacial behavior was captured, linked to strain gradients and reversible Au ↔ Au2S phase transitions.

Conclusions:

  • The study provides in situ insights into the complex growth dynamics of Au-PbS core-shell nanoparticles.
  • Observed phenomena like preferential nucleation and interface dynamics are critical for controlling nanostructure formation.
  • DFT calculations support the role of strain gradients in mediating interfacial phase transitions during shell growth.