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The Co-Au interface in bimetallic nanoparticles: a high resolution STEM study.

Alvaro Mayoral1, Sergio Mejía-Rosales, Marcelo M Mariscal

  • 1Department of Physics and Astronomy, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78251, USA.

Nanoscale
|October 15, 2010
PubMed
Summary

Gold/cobalt nanoparticles formed a perfect interface after thermal treatment. Cobalt atoms substituted gold atoms, creating a face-centered cubic structure matching the gold lattice.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Core-shell and bimetallic nanoparticles are synthesized using inert gas condensation.
  • Thermal treatment can alter nanoparticle morphology and interfacial properties.

Purpose of the Study:

  • To investigate the structural and interfacial characteristics of gold/cobalt (Au/Co) nanoparticles after thermal treatment.
  • To elucidate the atomic arrangement and potential interdiffusion at the Au/Co interface.

Main Methods:

  • Aberration-corrected scanning transmission electron microscopy (STEM) for high-resolution imaging.
  • Inert gas condensation for nanoparticle synthesis.
  • Thermal treatment under atmospheric conditions.
  • Numerical simulations for image analysis and comparison.

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Main Results:

  • Initially formed core-shell and bimetallic Au/Co nanoparticles transformed upon thermal treatment.
  • Cobalt nanoparticles developed a fine layer, creating a perfect interface with gold.
  • The cobalt-rich zones exhibited a face-centered cubic (fcc) arrangement, aligning with the gold lattice.
  • Atomic analysis confirmed cobalt substitution within the gold lattice at the interface.

Conclusions:

  • Thermal treatment induces significant structural and interfacial changes in Au/Co nanoparticles.
  • A highly ordered interface with atomic substitution is formed, where cobalt adopts the gold lattice structure.
  • This controlled interfacial atomic arrangement has implications for designing advanced nanomaterials.