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Structural characterization of Pt-Pd core-shell nanoparticles by Cs-corrected STEM.

R Esparza1, Amado F García-Ruiz2, J J Velázquez Salazar3

  • 1Centra de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, 76230 Santiago de Querétaro, Querétaro, Mexico.

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|July 4, 2014
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Summary

Platinum-palladium (Pt-Pd) core-shell nanoparticles were synthesized for enhanced catalytic properties. Characterization confirmed Pd shell growth on Pt core nanoparticles, suggesting improved catalytic performance.

Keywords:
Aberration correctedChemical synthesisCore-shellElectron microscopyNanostructurePt–Pd

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Catalysis

Background:

  • Core-shell nanoparticles, specifically Pt-Pd structures, are known to enhance catalytic properties compared to monometallic counterparts.
  • The synthesis of bimetallic nanoparticles requires precise control over morphology and composition for optimal performance.

Purpose of the Study:

  • To synthesize Pt-Pd core-shell nanoparticles using a modified polyol method.
  • To characterize the structural and elemental properties of the synthesized nanoparticles.
  • To investigate the growth mechanism of the palladium shell on the platinum core.

Main Methods:

  • Modified polyol method utilizing ethylene glycol as a reducer and poly(N-vinyl-2-pyrrolidone) as a stabilizing agent.
  • Thermal treatment under reflux up to 285 °C.
  • Aberration-corrected scanning transmission electron microscopy (Cs-STEM) with high-angle annular dark field (HAADF) detector.
  • Energy-dispersive X-ray spectrometry (EDS) and electron energy-loss spectroscopy (EELS) for elemental analysis.

Main Results:

  • Successful synthesis of Pt-Pd core-shell nanoparticles with polyhedral morphology.
  • Average nanoparticle size of 13.5 nm, with an average Pt core size of 8.5 nm and a Pd shell thickness of approximately 2.5 nm.
  • High-resolution elemental mapping confirmed the Pd shell growth on the Pt core.

Conclusions:

  • The synthesis method yielded well-defined Pt-Pd core-shell nanoparticles.
  • The observed layer-by-layer growth of the Pd shell suggests a Frank-van der Merwe growth mechanism.
  • These Pt-Pd core-shell nanoparticles hold potential for applications requiring enhanced catalytic activity.