Pt Diffusion Dynamics for the Formation Cr-Pt Core-Shell Nanoparticles

G. Gupta, P. Iqbal, F. Yin, J. Liu, R. E. Palmer, S. Sharma, Ken C F LEUNG, P. M. Mendes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Layered core-shell bimetallic Cr-Pt nanoparticles were prepared by the formation and later reduction of an intermediate Pt-ion-containing supramolecular complex onto preformed Cr nanoparticles. The resultant nanoparticles were characterized by X-ray diffraction analysis, transmission electron microscopy, X-ray photoelectron spectroscopy, and aberration-corrected scanning transmission electron microscopy. The results are consistent with the presence of Pt diffusion during or after bimetallic nanoparticle formation, which has resulted in a Pt/Cr-alloyed core and shell. We postulate that such Pt diffusion occurs by an electric-field-assisted process according to Cabrera-Mott theory and that it originates from the low work function of the preformed oxygen-defective Cr nanoparticles and the rather large electron affinity of Pt.

Original languageEnglish
Pages (from-to)6917-6923
Number of pages7
JournalLangmuir
Volume31
Issue number24
DOIs
Publication statusPublished - 23 Jun 2015

Scopus Subject Areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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