Variation of surface composition and sintering of binary Pd70Ag30 nanoparticles

Kuan Wen Wang, Shu Ru Chung, Ling Yun Jang, Jyh Fu Lee, Tsong Pyng Perng

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5 Scopus citations

Abstract

The variation of surface composition and sintering of the binary Pd70Ag30 nanoparticles prepared by chemical reduction were studied. The composition of the as-prepared Pd70Ag30 nanoparticles across the diameter is inhomogeneous due to different reduction potentials of Pd and Ag. Upon heating, Ag will migrate to the surface because of its lower surface energy. Surface modification results in variation of surface composition during the sintering process. Stearic acid acts as a grain growth inhibitor. The migration of Ag to the surface is suppressed and the sintering is retarded. Modification by polyethylene glycol leads to more migration of Ag atoms from the core to the surface. This makes the nanoparticles easier to sinter.

Original languageEnglish
Pages (from-to)62-65
Number of pages4
JournalJournal of Alloys and Compounds
Volume415
Issue number1-2
DOIs
StatePublished - 18 May 2006

Keywords

  • ESCA
  • Nanoparticles
  • Pd-Ag
  • Polyethylene glycol
  • Sintering
  • Stearic acid
  • Surfactant
  • XANES

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