Magnetic and Microwave-absorption Properties of Graphite-coated （Fe, Ni） Nanocapsules

• Published in: 材料科学技术学报：英文版 Vol. 27; no. 7; pp. 607 - 614
• Main Author: Zhigao Xie Dianyu Geng Xianguo Liu Song Ma Zhidong Zhang
• Format: Journal Article
• Language: English
• Published: 2011
• Subjects: 微波吸收性能; 核/壳结构; 电磁场; 石墨涂层; 纳米胶囊; 铁; 镍; 高分辨透射电子显微镜
• ISSN: 1005-0302

The structure, magnetic and microwave-absorption properties of graphite-coated （Fe, Ni） alloy nanocapsules, synthesized by the arc-discharge method, have been studied. High-resolution transmission electron microscopy shows that the nanocapsules have a core/shell structure with （Fe, Ni） alloy as the core and graphite as the shell. All （Fe, Ni） alloy nanocapsules/paraffin composites show good microwave-absorption properties. The optimal reflection loss （RL） was found for （Fe70Ni30）/C nanocapsules/paraffin composites, being -47.84 dB at 14.6 GHz for an absorber thickness of 1.99 mm, while the RL values exceeding -10 dB were found in the 12.4– 17.4 GHz range, which almost covers the Ku band （12.4–18 GHz）. For （Fe70Ni30）/C nanocapsules/paraffin composites, RL values can exceed -10 dB in the 11.4–18 GHz range with an absorber thickness of 1.91 mm, which cover the whole Ku band.