Synthesis of Hierarchical CF@Fe<sub>3</sub>O<sub>4</sub> Fibers Decorated with MoS<sub>2</sub> Layers Forming Core–Sheath Microstructure toward Tunable and Efficient Electromagnetic Wave Absorption
Xiaopeng Han, Huiwu Cai, Guangheng Wang, Shuai Zhang, Xudong Liu, Ying Huang
Abstract
Hierarchical structural design has been verified as a feasible strategy to fabricate effective electromagnetic wave (EMW) absorbers, so we designed hierarchical core–sheath composites with magnetic particles and dielectric layers. In this work, a hierarchical structure of carbon fiber (CF)@Fe 3 O 4 @MoS 2 (CPDF7-M) was prepared by introducing Fe 3 O 4 and depositing MoS 2 layers on the surface of fibers. Due to the synergistic effects from the CF@Fe 3 O 4 increasing the conductive and magnetic loss and the outer MoS 2 layers improving the impedance matching, the optimal reflection loss ( R L ) value was −63.1 dB at 2.7 mm and the effective absorption bandwidth (EAB) was 9.1 GHz covering the X and Ku band. Moreover, the EAB values were adjusted with a specific MoS 2 loading at different thicknesses, which provided the necessary reference for the construction of efficient and flexible absorbers in the EMW absorption fields.