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 journalArticlepeer-review

55 Citations (Scopus)

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 - 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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