关键词: 核壳结构, 电磁波吸收, 阻抗匹配, 二硫化钼(MoS₂), MOFs衍生物

Abstract: For non-magnetic metal-organic framework (MOF) derivatives, the core challenge in current research is how to overcome impedance mismatch and enhance microwave absorption performance through precise control of the material’s micro-morphology and dielectric properties without introducing magnetic components. The incorporation of MoS₂, a two-dimensional material with semiconductor properties and a layered structure, can significantly enhance the absorptive performance of such materials. In this work, a novel Ti-MOF derivative absorber material (TiO₂/C@MoS₂) with hydrangea-like morphology is proposed by in situ growing MoS₂ with varying loadings on Ti-MOFs to overcome the aforementioned challenges. Specifically, the TiO₂/C@MoS₂ composite material TM72 achieves a minimum reflection loss (RL_min) of -62.1 dB at a thickness of 2.05 mm, a maximum effective absorption bandwidth (EAB_max) of 5.88 GHz (corresponding to a thickness of 2.18 mm), and a radar cross-section (RCS) reduction of 16.6 dB m². For TM71, the RL_min is -52.82 dB at a matching thickness of 2.47 mm, with an EAB_max of 6.93 GHz corresponding to a matching thickness of 2.28 mm, and it also achieves a radar cross-section (RCS) reduction of 17.95 dB m². This enables TiO₂/C@MoS₂ to fulfill the critical demands of electromagnetic wave absorbing materials (EMWAMs): “strong, broad, thin, and lightweight”. Furthermore, RCS simulations validate the actual applicability of this composite material. Consequently, this effort provides an innovative strategy for constructing next-generation EMWAMs featuring ultrathin structures, outstanding absorption performance, and broadband absorption capabilities.

Key words: Core-shell structure, Electromagnetic wave absorption, Impedance matching, Molybdenum disulfide (MoS₂), MOFs derivatives