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Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles
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M T Hershberger1, M Hupalo2, P A Thiel3

  • 1Ames Laboratory-U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.

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Nucleation in Pb/Si(111) occurs explosively, not gradually. This new mechanism involves coherent motion of the wetting layer over mesoscopic distances, challenging classical nucleation theory.

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Area of Science:

  • Surface science
  • Condensed matter physics
  • Materials science

Background:

  • Classical nucleation theory describes island formation via gradual adatom aggregation.
  • Previous studies focused on gradual adatom diffusion and aggregation for nucleation.

Purpose of the Study:

  • To investigate an alternative nucleation mechanism observed in Pb/Si(111) experiments.
  • To challenge and expand upon classical nucleation theory.

Main Methods:

  • Low-temperature experimental observations of Pb/Si(111).
  • Analysis of island formation dynamics and growth rates.
  • Investigation of adatom behavior and wetting layer properties.

Main Results:

  • Observed "explosive" nucleation of perfect crystalline islands.
  • Identified a critical coverage (Θ_{c}=1.22 ML) for this explosive event.
  • Noted high island growth rates and directional correlations between islands.
  • Evidence of coherent wetting layer motion over mesoscopic distances.

Conclusions:

  • The observed nucleation is driven by a highly coherent motion of the wetting layer.
  • This suggests a departure from classical nucleation models based on random diffusion.
  • The findings offer new insights into non-classical nucleation phenomena.