Hollow core–shell structure Co/C@MoSe2 composites for high-performance microwave absorption. (November 2022)

• Record Type: Journal Article
• Authors: Su, Jie; Nie, Zhuguang; Feng, Yang; Hu, Xingman; Li, Haiming; Zhao, Zhiyue; Zan, Shuyu; Qi, Shuhua
• Is Part Of: Composites. Volume 162(2022)
• Publication Date: 2022-11
• Subjects: A. Nanocomposites -- A. Nano-structures -- E. Autoclave -- Microwave absorption; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2022.107140
• Languages: English
• ISSNs: 1359-835X

Abstract

Highlight: Hollow core–shell structure Co/C@MoSe2 was constructed to study the effect on electromagnetic wave absorption performance. Co/C@MoSe2 achieves a high electromagnetic wave absorption, with an effective absorption bandwidth of 5.1 GHz and a minimum reflection loss of −42 dB(2.5 mm). The impedance matching of the composite was successfully regulated with the increasing doping amount of MoSe2 . Composites realize the synergistic loss of electromagnetic waves caused by dielectric loss, magnetic loss and conductive loss. Abstract: To address an increasingly serious electromagnetic radiation problem and the urgent need to develop lightweight, high-efficiency, and strong-attenuation electromagnetic wave absorbing (EMA) materials, a hollow core–shell Co/C@MoSe2 composite structure was prepared. Flower-like MoSe2 was wrapped around the surface of Co/C composites after a hydrothermal reaction. The introduction of MoSe2 and the designed hollow core–shell structure was beneficial for optimizing the electromagnetic characteristics of the composites. Owing to the magnetism of Co/C composites after high-temperature treatment, the composite materials were capable of magnetic dissipation. The introduced multiple-attenuation mechanisms, such as dielectric loss, magnetic loss, and conductive loss, contributed greatly to the incident electromagnetic wave attenuation. Among them, Co/C@MoSe2 -4 exhibited excellent electromagnetic wave absorption performance. When the matching thickness was 2.5 mm, the minimum reflection loss was −42 dB, and the effective absorption bandwidth was 5.1 GHz. This work provided a smart strategy for electromagnetic wave absorbers designing and commerical application.