Alloying and dealloying of CuPt bimetallic nanocrystals

Fengjiao Yu, Wuzong Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Bimetallic CuPt nanocrystals with size ranging from 3 to 30 nm were synthesized in the presence of either hexadecylamine or poly(vinylpyrrolidone) as a capping agent. Different growth stages of CuPt nanoparticles prepared with hexadecylamine have been investigated and a non-classic mechanism governing the formation of the metal alloy was revealed. It was found that the precursor molecules aggregate into amorphous spheres at a very early stage, followed by surface multiple nucleation, formation and combination of crystalline islands to produce a core shell structure with surface-to-core extension of the crystallization to achieve single crystals. CuPt nanocrystals synthesized with poly (vinylpyrrolidone) grew via the classic route. Dealloying treatment was applied on these CuPt nanoalloys to selectively remove Cu. Large particles (similar to 30 nm) with Cu-rich cores exhibited hollow structures after dealloying while 3 nm particles remained solid, demonstrating that particle size and composition have a great influence on the final morphology of dealloyed particles. (C) 2013 Chinese Materials Research Society. Production and hosting by Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)331-337
Number of pages7
JournalProgress in Natural Science: Materials International
Volume23
Issue number3
DOIs
Publication statusPublished - Jun 2013

Keywords

  • CuPt alloy
  • Dealloying
  • Nanocrystal
  • Electron microscopy
  • Crystal growth
  • CRYSTAL-GROWTH
  • CORE-SHELL
  • FORMATION MECHANISM
  • OXYGEN REDUCTION
  • NANOPARTICLES
  • MONODISPERSE
  • CATALYSIS
  • ELECTROCATALYSIS
  • REACTIVITY
  • OXIDATION

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