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

Akinori Sugiyama; Yousuke Taguchi; Shuhei Nagaoka; Atsushi Nakajima

doi:10.1016/j.cplett.2009.12.004

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

Akinori Sugiyama
, Yousuke Taguchi
, Shuhei Nagaoka
, Atsushi Nakajima

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

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, T_B, increase with the size, where T_B 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 language	English
Pages (from-to)	129-132
Number of pages	4
Journal	Chemical Physics Letters
Volume	485
Issue number	1-3
DOIs	https://doi.org/10.1016/j.cplett.2009.12.004
Publication status	Published - 2010 Jan 18

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1016/j.cplett.2009.12.004

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title = "Size-dependent magnetic properties of naked and ligand-capped nickel nanoparticles",

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.",

author = "Akinori Sugiyama and Yousuke Taguchi and Shuhei Nagaoka and Atsushi Nakajima",

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doi = "10.1016/j.cplett.2009.12.004",

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TY - JOUR

T1 - Size-dependent magnetic properties of naked and ligand-capped nickel nanoparticles

AU - Sugiyama, Akinori

AU - Taguchi, Yousuke

AU - Nagaoka, Shuhei

AU - Nakajima, Atsushi

PY - 2010/1/18

Y1 - 2010/1/18

N2 - 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.

AB - 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.

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DO - 10.1016/j.cplett.2009.12.004

M3 - Article

AN - SCOPUS:73149121601

SN - 0009-2614

VL - 485

SP - 129

EP - 132

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 1-3

ER -

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

Abstract

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