Magnetic properties and microwave absorption properties of polymer-protected cobalt nanoparticles

Yoshihiro Kato, Satoshi Sugimoto, Ken Ichi Shinohara, Nobuki Tezuka, Toshio Kagotani, Koichiro Inomata

研究成果: Article査読

32 被引用数 (Scopus)

抄録

This paper describes magnetic properties and microwave absorption properties of polymer-protected cobalt nanoparticles. Cobalt nanoparticles were prepared using the thermal decomposition of dicobalt octacarbonyl in ethylene glycol. They were stabilized and dispersed by coexisting with poly(N-vinyl-2-pyrrolidone) (PVP), resulting in an average diameter of 45 mm. The X-ray diffraction (XRD) analysis revealed that the Co-PVP sample synthesized at 170°C for 3 h, with the mole ratio of cobalt: PVP = 1 : 10 (mol : unit mole), consisted of two phases of hcp and fcc cobalt. Their saturation magnetization measured using a vibrating sample magnetometer (VSM) was 1.53 × 10-4 Wb·m·kg-1. The compacted sample, produced from the PVP-protected cobalt nanoparticles, showed a reflection loss (R.L.) less than -20 dB at the frequency (matching frequency: fm) of 0.54 and 0.64 GHz with the thickness (matching thickness: dm) of 6.16 and 5.04 mm, respectively. Therefore, it is concluded that polymer-protected cobalt nanoparticles have a possibility for the use as microwave absorption materials.

本文言語English
ページ(範囲)406-409
ページ数4
ジャーナルMaterials Transactions
43
3
DOI
出版ステータスPublished - 2002 3

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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