Desorption of surfactant and sintering of surface-modified Pd x Ni 1 - x nanoparticles

Kuan Wen Wang, Shu Ru Chung, Wei Hsiu Hung, Tsong P. Perng

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A series of Pd x Ni 1 - x nanoparticles in a diameter of 6-7 nm were prepared by wet chemical reduction. They were then modified with two surfactants, stearic acid (SA) and polyethylene glycol (PEG). Desorption of the surfactant was studied using a temperature programmed desorption technique, and the sintering behavior of surface-modified Pd x Ni 1 - x nanoparticles was examined. Since surface energy of the nanoparticles depends on the alloy composition, it can be correlated with the desorption temperature of surfactant from the nanoparticle surface. Because Ni has a higher surface energy, the surfactant desorption temperature increases as the Ni content increases. With the same stoichiometry, the desorption temperature of SA is always higher than that of PEG. The SA-modified nanoparticles have higher thermal stability and are less sintered than PEG-modified nanoparticles. The sintering and growth behavior of the nanoparticles can be correlated with variation of surface energy due to different surface modification.

Original languageEnglish
Pages (from-to)8751-8755
Number of pages5
JournalApplied Surface Science
Volume252
Issue number24
DOIs
Publication statusPublished - 2006 Oct 15

Keywords

  • Nanoparticles
  • Pd-Ni
  • Polyethylene glycol
  • Sintering
  • Stearic acid
  • Surface modification

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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