微波食品加热
反射损耗
材料科学
吸收(声学)
光电子学
带隙
电磁辐射
联轴节(管道)
涂层
相(物质)
凝聚态物理
复合数
光学
复合材料
化学
物理
有机化学
量子力学
作者
Fei Wu,Mengyun Ling,Lei Zhang,Qiuyu Zhang,Baoliang Zhang
标识
DOI:10.1016/j.compositesb.2023.111136
摘要
Herein, we propose a combination strategy to induce robust room-temperature electromagnetic coupling in non-magnetic MoS2 semiconductor (2H–MoS2). The introduction of ascorbic acid (AA) is intended to introduce sulfur vacancies (sv) in the process of 2H–MoS2 nano-sheet shells coating on the surface of three-dimensional (3D) matrix. It promotes the transformation of local lattice (2H–MoS2) into metal phase (1T-MoS2). The transformed 1T-MoS2 phase improves the conductivity (σ) of the composite by 1.48 times. Due to the Mo4+4d energy state within the bandgap, the exchange interaction between the sv and the Mo4+4d bandgap state produces a robust intrinsic electromagnetic response of more than 1.2 emu/g. Density functional theory (DFT) calculations are used to analyze the above results, and a novel electromagnetic-coupling-enhanced microwave absorption mechanism is proposed. The results indicates that microwave absorption performance can be effectively improved by the phase-incorporation effect. The minimum reflection loss (RLmin) reaches −53.1 dB (1.7 mm) and the adjustable effective absorption bandwidth (EAB) covers 14.5 GHz (3.5–18 GHz) at the various matching thicknesses. This work might shed light on a new possibility of manipulating electromagnetic interaction to promote microwave absorption.
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