Designing nanocomposite with multi-level interfaces is an effective approach to improving the microwave absorbing capability of materials. In this study, the urchin-like multiple core-shelled Co/CoS₂@NC@MoS₂ composites (CCM) are designed and fabricated by high-temperature pyrolysis and solvothermal process, where the structure and phase composition are affected by the migration of Co. Abundant interfaces in the multiple core-shelled structures favor the polarization relaxation loss, defects of MoS₂ and nitrogen doping carbon (NC) matrix induce the dipole orientation polarization loss. The CCM composite exhibits excellent microwave absorption with the strongest reflection loss (RL) of − 43.9 dB. Meanwhile, the broadest effective absorption bandwidth (EAB, RL<−10 dB) is 4.4 GHz with a thickness of 1.5 mm. Besides, with the thickness of 1.0–3.5 mm, all peaks of RL_min< −20 dB (99 % absorptivity). It is believed that this work can provide an effective strategy for the design of tunable multi-interface nanostructures to regulate microwave absorption.

设计具有多级界面的纳米复合材料是提高材料吸波能力的有效途径。在这项研究中，海胆状多核壳 Co/CoS ₂ @NC@MoS ₂复合材料 (CCM) 是通过高温热解和溶剂热过程设计和制造的，其结构和相组成受迁移的影响Co. 多个核壳结构中丰富的界面有利于极化弛豫损失，MoS _2的缺陷和氮掺杂碳（NC）矩阵引起偶极取向极化损失。CCM 复合材料表现出出色的微波吸收能力，最强的反射损耗 (RL) 为 − 43.9 dB。同时，最宽的有效吸收带宽（EAB，RL<−10 dB）为 4.4 GHz，厚度为 1.5 mm。此外，厚度为 1.0–3.5 mm 时，所有 RL _min峰值< −20 dB（99% 吸收率）。相信这项工作可以为可调谐多界面纳米结构的设计提供一种有效的策略来调节微波吸收。