Synthesis of nickel nanoparticles in aqueous cationic surfactant solutions

Dong Hwang Chen, Chih Hsuan Hsieh

Research output: Contribution to journalArticle

233 Citations (Scopus)

Abstract

The synthesis of nickel nanoparticles by the reduction of nickel chloride with hydrazine in an aqueous solution of cationic surfactants CTAB/TC12AB was studied. It was found that an appropriate amount of NaOH, trace acetone, and an elevated temperature were necessary for the formation of pure nickel nanoparticles. Also, it was not necessary to perform the reaction under a nitrogen atmosphere. X-ray diffraction revealed the resultant particles were pure nickel crystalline with a face-centered cubic (fcc) structure. Their mean diameter was 10-36 nm, increasing with increasing nickel chloride concentration or decreasing hydrazine concentration. When the concentration ratio of hydrazine to nickel chloride was above 40, the mean diameter approached a constant value. The magnetic measurement on a typical sample with a mean diameter of 12 nm showed that the resultant nickel nanoparticles were superparamagnetic due to their extremely small size. The saturation magnetization, remanent magnetization, and coercivity were 32 emu g-1, 5.0 emu g-1, and 40 Oe, respectively. Also, the magnetization was observed to increase with decreasing temperature. All the observed magnetic properties essentially reflected the nanoparticle's nature.

Original languageEnglish
Pages (from-to)2412-2415
Number of pages4
JournalJournal of Materials Chemistry
Volume12
Issue number8
DOIs
Publication statusPublished - 2002 Aug 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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