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

R. Esparza, Amado F. García-Ruiz, J. J. Velázquez Salazar, R. Pérez, M. José-Yacamán

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Pt-Pd core-shell nanoparticles were synthesized using a modified polyol method. A thermal method under refluxing, carrying on the reaction up to 285 C, has been performed to reduce metallic salts using ethylene glycol as reducer and poly(N-vinyl-2-pyrrolidone) as protective reagent of the formed bimetallic nanoparticles. According to other works, this type of structure has been studied and utilized to successfully increase the catalytic properties of monometallic nanoparticles Pt or Pd. Core-shell bimetallic nanoparticles were structurally characterized using aberration-corrected scanning transmission electron microscopy (Cs-STEM) equipped with a high-angle annular dark field detector, energy-dispersive X-ray spectrometry (EDS), and electron energy-loss spectroscopy (EELS). The high-resolution elemental line scan and mappings were carried out using a combination of STEM-EDS and STEM-EELS. The obtained results show the growth of the Pd shell on the Pt core with polyhedral morphology. The average size of the bimetallic nanoparticles was 13.5 nm and the average size of the core was 8.5 nm; consequently, the thickness of the shell was around 2.5 nm. The growth of the Pd shell on the Pt core is layer by layer, suggesting a Frank-van der Merwe growth mechanism.

Original languageEnglish (US)
Article number1342
JournalJournal of Nanoparticle Research
Volume15
Issue number1
DOIs
StatePublished - Jan 2013
Externally publishedYes

Keywords

  • Aberration corrected
  • Chemical synthesis
  • Core-shell
  • Electron microscopy
  • Nanostructure
  • Pt-Pd

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Modeling and Simulation

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