Size-dependent magnetic properties of naked and ligand-capped nickel nanoparticles

Akinori Sugiyama, Yousuke Taguchi, Shuhei Nagaoka, Atsushi Nakajima

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Ligand-free naked and oleylamine-capped nickel nanoparticles (Ni NPs) were size-selectively prepared in the size ranges of 5-17 nm (naked) and 13-19 nm (capped) in diameter through gas- and liquid-phase syntheses, respectively. As for the magnetic properties of both the naked and oleylamine-capped Ni NPs, the blocking temperatures, TB, increase with the size, where TB for the naked Ni NPs are significantly higher than that for the capped Ni NPs. The results indicate that the ferromagnetic core region of Ni NPs is reduced by the formation of nonmagnetic layers at the surface of the capped NPs, where their thickness is estimated to be 1-2 nm.

Original languageEnglish
Pages (from-to)129-132
Number of pages4
JournalChemical Physics Letters
Volume485
Issue number1-3
DOIs
Publication statusPublished - 2010 Jan 18

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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