Achieving ultra-broadband electromagnetic absorption of Ag regulated hollow Ag/CuO@CuS through balancing conduction loss and impedance matching. (1st May 2023)

• Record Type: Journal Article
• Authors: Zhang, Siyuan; Tao, Jinlei; Sun, Rui; Hu, Shipeng; Jiao, Jian
• Is Part Of: Journal of materials science & technology. Volume 144(2023)
• Page Start: 81
• Page End: 92
• Publication Date: 2023-05-01
• Subjects: Elemental sliver -- Impedance matching -- Conduction loss -- Electromagnetic wave absorption; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2022.10.020
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: A sliver regulation strategy is proposed to balance the conduction loss and impedance matching by constructing unique particle structure for the first time. The introduction of Ag provides a perfect conductive network for individual particles and whole structure, and gives enough space to control the stacking of particle to obtain excellent impedance matching. The RLmin and f E of H-P-Ag/CuO@CuS reached −40 dB and 8.56 GHz (2.3 mm), respectively. Abstract: Excellent impedance matching and high conduction loss are important factors for the preparation of high-performance electromagnetic wave (EMW) absorbing materials, but these two properties are often contradictory. In this work, three absorbers with unique hollow structures, H-Ag/CuO@CuS, H-O-Ag/CuO@CuS, and H-P-Ag/CuO@CuS, are designed and synthesized by adopting hollow CuO@CuS with double shell as carrier and silver nitrate as the structural regulator. The more voids coming from hollow structures, window-opened structures, and stacked pores improve the impedance matching of these absorbers, and the introduction of elemental Ag effectively regulates the conduction loss. Therefore, a balance between impedance matching and conduction loss is achieved to improve the reflection loss (RL) value and broadens the absorbing band of the absorbers. In comparison to H-Ag/CuO@CuS and HO-Ag/CuO@CuS (hollow structure with open window) in which elemental Ag is uniformly dispersed in the CuO layer, H-P-Ag/CuO@CuS exhibits more excellent EMW absorption performance due to more voids and an optimized conductive network arising from Ag/CuO pieces distributed between the hollow Ag/CuO@CuS particles and Ag distributed in the CuS layer. When the thickness is 2.3 mm, H-P-Ag/CuO@CuS provides an ultra-wide electromagnetic absorption band of 8.56 GHz (9.44–18 GHz), in which the RL < –10 dB and the minimum reflection loss of –41 dB. Graphical abstract: Image, graphical abstract