Yan Liang, Jiahang Qiu, Mu Zhang, Yudong Li, Xudong Sun, Dianning He, Xiaochen Wang, Hanhui Lei, Terence Xiaoteng Liu, Bowen Liu
Abstract Microwave absorbing materials (MAMs) not only achieve high electromagnetic absorption, but also have the characteristics of lightweight and oxidation resistance. This is a problem that needs to be solved urgently in some special fields. Therefore, we have done a series of experiments and prepared one-dimensional pea pod-like Co x Ni y @C absorbing material. Through the experimental results and previous work, we find that one-dimensional structure has great potential to achieve high absorption efficiency and lightweight, and can achieve good impedance matching at low filling rate, which is attributed to the enhancement of conductivity of one-dimensional structure and the interface polarization caused by core-shell structure, and the one-dimensional structure will further increase the heterogeneous interface area and enhance the interface polarization loss. The minimum reflection loss (RL min ) and effective absorption width (EABD) of a series of pea pod-like Co x Ni y @C were − 48.4 dB and 4.8 GHz for Co 2 Ni 1 @C (12.3 GHz, 2.2 mm), and-43.2 dB and 5.8 GHz for Co 3 Ni 1 @C (9.5 GHz, 2.1 mm). Because of the addition of Ni, the formed NiO layer protects the alloy particles, which makes Co x Ni y @C have certain oxidation resistance. After being oxidized at 350 ℃ for 12 h in air, the RL min and EABD of Co x Ni y @C remained at -41.2 dB and 5 GHz, respectively. This work shows the important potential of one-dimensional structure in lightweight of MAMs, and provides valuable insights for the subsequent research on oxidation resistance of MAMs.