Synthesis of NiAu alloy and core-shell nanoparticles in water-in-oil microemulsions

Hsin Kai Chiu, I. Chen Chiang, Dong Hwang Chen

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


NiAu alloy nanoparticles with various Ni/Au molar ratios were synthesized by the hydrazine reduction of nickel chloride and hydrogen tetrachloroaurate in the microemulsion system. They had a face-centered cubic structure and a mean diameter of 6-13 nm, decreasing with increasing Au content. As Au nanoparticles did, they showed a characteristic absorption peak at about 520 nm but the intensity decreased with increasing Ni content. Also, they were nearly superparamagnetic, although the magnetization decreased significantly with increasing Au content. Under an external magnetic field, they could be self-organized into the parallel lines. In addition, the core-shell nanoparticles, Ni3Au1@Au, were prepared by the Au coating on the surface of Ni3Au1 alloy nanoparticles. By increasing the hydrogen tetrachloroaurate concentration for Au coating, the thickness of Au shells could be raised and led to an enhanced and red-shifted surface plasmon absorption.

Original languageEnglish
Pages (from-to)1137-1144
Number of pages8
JournalJournal of Nanoparticle Research
Issue number5
Publication statusPublished - 2009 Jul

All Science Journal Classification (ASJC) codes

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


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