Impedance-attenuation balance on Ni@CN/WO3-δ ternary composites to enhance microwave absorption

• Published in: Journal of materials science. Materials in electronics 2022-06, Vol.33 (18), p.14426-14442
• Main Authors: Bao, Xiu-Kun, Shi, Gui-Mei, Yu, Di, Zhao, Qian, Wang, Xiao-Lei, Shi, Fa-Nian
• Format: Article
• Language: English
• Subjects: Attenuation; Carbon; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composite materials; Electric arcs; Impedance matching; Materials Science; Microwave absorption; Nanoparticles; Optical and Electronic Materials; Oxygen; Pyrolysis; Solid phases; Synergistic effect; Thickness; Vacancies
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-022-08366-8

The Ni@CN/WO 3-δ ternary composites were constructed by a two-step method in this work, which includes solid-phase pyrolysis and arc-discharging technology. Herein, the content of WO 3-δ in Ni@CN/WO 3-δ ternary composites was adjusted utilizing the precursor H 2 WO 4 amount. The result shows that the appropriate WO 3-δ content in Ni@CN/WO 3-δ ternary composites can effectively contribute to their cooperativity for electromagnetic parameters and impedance matching. As a result, the optimal reflection loss of the Ni@CN/WO 3-δ ternary composites can achieve in -42.4 dB at a thickness of 2.0 mm, and an efficient absorption bandwidth is 4.08 GHz at a matching thickness of only 1.7 mm. The study further reveals that the synergistic effects between the oxygen vacancies from appropriate WO 3-δ and the high conductivity of CN lead to the balance between impedance matching and attenuation capacity of the Ni@CN/WO 3-δ ternary composites, resulting in excellent microwave absorption performances. This work gives a feasible strategy for preparing high-performance microwave absorbents by oxygen vacancies engineering in the future.