Multiscale design of carbon-based, high-efficiency and wide-frequency microwave-absorption composites. Issue 14 (15th July 2021)

• Record Type: Journal Article
• Authors: Li, Hongxia; Yang, Chao; Cheng, Mingliang; Li, Zhong; Bandaru, Sateesh; Chen, Wenchao; Shi, Yueqin; Zhang, Jian; Liu, Xianguo; Zhang, Xuefeng
• Is Part Of: Ceramics international. Volume 47:Issue 14(2021)
• Page Start: 20467
• Page End: 20475
• Publication Date: 2021-07-15
• Subjects: Multiscale design -- Nanoparticle -- Composite -- Wide frequency -- Synergistic effect; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.04.056
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Dielectric- and magnetic-loss capabilities are directly related to the composition, micro-structure, and macro-scale structure of materials. However, despite progress in understanding loss capabilities, the investigation of designing electromagnetic-wave-absorbing materials with multiscale approaches is less developed. In the present contribution, we design dielectric/magnetic composites on the atomic and nanometer scales to obtain high-efficiency and wide-frequency microwave absorption. Atomic Fe, Ni and ferromagnetic phases of Fe3 O4 and Ni3 Fe are embedded in carbon at the nanoscale by means of a facile method. C–FeNi 5:8 showed maximum saturation magnetization values of 4.49 emu/g, an effective absorption band (fE ) of 6 GHz and the minimum refection loss of −21.6 dB, which is attributed to better impedance matching, and invocation of quarter-wavelength interference-cancellation theory arising from the synergistic effects of atomic Fe, Ni and nanoscale Fe3 O4 and Ni3 Fe. Our study builds a ferromagnetic-dielectric double-loss complex with multiscale design, and offers a new way to realize both high-efficiency and wide-frequency microwave absorption.