Atomic surface segregation and structural characterization of PdPt bimetallic nanoparticles

Carlos A. Rodríguez-Proenza, Juan P. Palomares-Báez, Marco A. Chávez-Rojo, Amado F. García-Ruiz, Cristy L. Azanza-Ricardo, Alan Santoveña-Uribe, Gabriel Luna-Bárcenas, José L. Rodríguez-López, Rodrigo Esparza

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Bimetallic nanoparticles are of interest since they lead to many interesting electrical, chemical, catalytic, and optical properties. They are particularly important in the field of catalysis since they show superior catalytic properties than their monometallic counterparts. The structures of bimetallic nanoparticles depend mainly on the synthesis conditions and the miscibility of the two components. In this work, PdPt alloyed-bimetallic nanoparticles (NPs) were synthesized through the polyol method, and characterized using spherical aberration (Cs) corrected scanning transmission electron microscopy (STEM). High-angle annular dark-field (HAADF)-STEM images of bimetallic nanoparticles were obtained. The contrast of images shows that nanoparticles have an alloy structure with an average size of 8.2 nm. Together with the characterization of nanoparticles, a systematic molecular dynamics simulations study focused on the structural stability and atomic surface segregation trends in 923-atom PdPt alloyed-bimetallic NPs was carried out.

Original languageEnglish
Article number1882
JournalMaterials
Volume11
Issue number10
DOIs
StatePublished - 2 Oct 2018

Keywords

  • Bimetallic nanoparticles
  • Electron microscopy
  • Molecular dynamics simulation
  • Nanostructures
  • PdPt alloys

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