Synthesis of core-shell fishbone-like Cu@Ni composites and their electromagnetic wave absorption properties

• Published in: Powder technology Vol. 319; pp. 245 - 252
• Main Authors: Liang, Luyang, Guo, Xiaoqin, Bai, Zhongyi, Zhao, Biao, Zhang, Rui
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-09-2017; Elsevier BV
• Subjects: Absorption; Chemical synthesis; Copper; Core-shell structure; Cu@Ni composites; Dielectric loss; Electromagnetism; Fishbone-like structure; Magnetic properties; Microwave absorption; Nickel; Paraffin; Point charge; Studies; Cu@Ni composites; Fishbone-like structure; Core-shell structure; Microwave absorption; Point charge
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2017.06.063

In this work, core-shell fishbone-like Cu@Ni composites have been successfully prepared via a facile solution reduction method. The morphology, structure and microwave absorption (MA) properties of Cu@Ni paraffin composites were investigated. The results demonstrate that the fishbone-like Cu@Ni composites have core-shell heterostructure with Cu as the core and Ni as the shell. And the Cu@Ni paraffin-composite containing 50wt% Cu@Ni exhibits excellent electromagnetic wave absorption properties. The minimum reflection loss (RLmin) of −32.2dB can be observed at 8.2GHz and the bandwidth with RL less than −10dB reaches 13.2GHz (4.8–18.0GHz) with a thin absorber thickness between 1.0 and 3.0mm. The prominent microwave absorption properties mainly come from its synergistic advantage of magnetic loss and dielectric loss. Besides, this novel fishbone-like Cu@Ni structure is also beneficial to enhance electromagnetic-wave-absorbing properties due to the multiple reflections and scattering that occurs in the branch of fishbone-like structure. Furthermore, the one-dimensional fishbone is supposed to be as antenna tip, which can receive more waves and consume more electromagnetic energy.
The fishbone-like core-shell Cu@Ni composites prepared by a facile reduction show thin thickness, wide band and light weight characteristics. [Display omitted]
•The fishbone like core-shell Cu@Ni composites were prepared by a facile solution reduction method.•The fishbone like Cu@Ni composites show the superior microwave absorption.•The minimum reflection loss (RLmin) of −32.2dB can be observed at 8.2GHz.•The superior absorption was attributed to interfacial polarization and point charge point mechanism.