Origin and shape evolution of core-shell nanoparticles in Au-Pd: From few atoms to high Miller index facets

Nabraj Bhattarai, Gilberto Casillas, Subarna Khanal, J. Jesus Velazquez Salazar, Arturo Ponce, Miguel Jose-Yacaman

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Au-Pd core-shell nanocubes and triangular nanoparticles were systematically synthesized from a few Pd layers up to fully grown morphologies by a modified seed-mediated growth method. The shape evolution of Au-Pd core-shell nanoparticles from single crystal and singly twinned seed to final concave nanocube and triangular plates are presented at atomic level by Cs-corrected scanning transmission electron microscopy (STEM). The growth mechanism of both morphologies was studied throughout different sizes. It was found that the concave nanocubes grew from octahedral Au seeds due to fast growth along 〈111〉; directions; while the triangular nanoparticles grew from singly twinned Au seeds, growing twice as fast in 〈110〉 directions along the twin boundary; compared to the 〈111〈 direction perpendicular to the twin boundary. Both the concave nanocubes and triangular nanoparticles presented high index facet (HIF) surfaces that will increase the catalytic activity of different reactions.

Original languageEnglish (US)
Article number1660
JournalJournal of Nanoparticle Research
Volume15
Issue number6
DOIs
StatePublished - Jun 2013
Externally publishedYes

Keywords

  • Core-shell nanostructure
  • Cs-corrected scanning transmission electron microscopy
  • Growth mechanism
  • High index facet surfaces

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

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