Magnetic Cu-Ni (core-shell) nanoparticles in a one-pot reaction under microwave irradiation

Tomohisa Yamauchi, Yasunori Tsukahara, Takao Sakata, Hirotaro Mori, Takeshi Yanagida, Tomoji Kawai, Yuji Wada

Research output: Contribution to journalArticle

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Abstract

We successfully prepared face-centered cubic (fcc) Cu-Ni (core-shell) nanoparticles by intramolecular reduction of formate complexes of Cu 2+ and Ni2+ with long-chain amine ligands in a one-pot reaction within an extremely short time realized only under microwave irradiation. Observation by an HAADF-STEM technique showed that the nanostructure in one particle consisted of a Ni-rich shell and a Cu-rich core. Cu4Ni6 nanoparticles with an average size of 11.7 nm were comprised of a Cu core with a diameter of ca. 6.0 nm, a Ni shell ca. 1.6 nm thick and a 0.9 nm thick interlayer of mixed Cu-Ni alloy between the Cu core and the Ni shell. Both the oxidation characteristics and the magnetic properties were dramatically affected by the molar ratios of Cu:Ni in the Cu-Ni nanoparticles. The magnetization of Cu3Ni7 and Cu 4Ni6 comprised of a diamagnetic Cu-rich core, ferromagnetic Ni-rich shell and antiferromagnetic NiO-rich layer on the particle surface showed an exchange bias (209 and 143 Oe, respectively).

Original languageEnglish
Pages (from-to)515-523
Number of pages9
JournalNanoscale
Volume2
Issue number4
DOIs
Publication statusPublished - Apr 19 2010
Externally publishedYes

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Microwave irradiation
formic acid
Nanoparticles
Amines
Nanostructures
Magnetization
Magnetic properties
Ligands
Oxidation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Yamauchi, T., Tsukahara, Y., Sakata, T., Mori, H., Yanagida, T., Kawai, T., & Wada, Y. (2010). Magnetic Cu-Ni (core-shell) nanoparticles in a one-pot reaction under microwave irradiation. Nanoscale, 2(4), 515-523. https://doi.org/10.1039/b9nr00302a

Magnetic Cu-Ni (core-shell) nanoparticles in a one-pot reaction under microwave irradiation. / Yamauchi, Tomohisa; Tsukahara, Yasunori; Sakata, Takao; Mori, Hirotaro; Yanagida, Takeshi; Kawai, Tomoji; Wada, Yuji.

In: Nanoscale, Vol. 2, No. 4, 19.04.2010, p. 515-523.

Research output: Contribution to journalArticle

Yamauchi, T, Tsukahara, Y, Sakata, T, Mori, H, Yanagida, T, Kawai, T & Wada, Y 2010, 'Magnetic Cu-Ni (core-shell) nanoparticles in a one-pot reaction under microwave irradiation', Nanoscale, vol. 2, no. 4, pp. 515-523. https://doi.org/10.1039/b9nr00302a
Yamauchi, Tomohisa ; Tsukahara, Yasunori ; Sakata, Takao ; Mori, Hirotaro ; Yanagida, Takeshi ; Kawai, Tomoji ; Wada, Yuji. / Magnetic Cu-Ni (core-shell) nanoparticles in a one-pot reaction under microwave irradiation. In: Nanoscale. 2010 ; Vol. 2, No. 4. pp. 515-523.
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