The development of microwave absorbing materials with high performance is one of the effective strategies to solve the increasingly serious electromagnetic pollution problem, and has received the attention of researchers. Herein, the structure and composition manipulation of TiCT MXene and MOFs derivatives are investigated. It is found that the TiO produced by oxidation of TiCT MXene, as a low dielectric material, can effectively solve the impedance mismatch caused by the high conductivity of TiCT MXene. Additionally, MOFs derivatives with excellent dielectric-magnetic properties are often obtained by high temperature pyrolysis, which also aids in the oxidation of TiCT MXene. Here, we successfully synthesized ZIF-67 nanoparticles on the surface of a three-dimensional spherical skeleton supported by TiCT MXene nanosheets through template method and electrostatic self-assembly, and obtained CoO/Co/NC@MXene microspheres with an obvious hollow structure after one-step pyrolysis. This magnetic carbon heterostructure could effectively optimize the impedance matching and achieve efficient microwave absorption. The HCCM-800 sample had a minimum reflection loss value of −71.60 dB with thickness of 2.25 mm and a maximum effective absorption bandwidth achieved 5.14 GHz at 1.85 mm. Meanwhile, the radar cross section (RCS) simulation revealed that the HCCM-800 sample’s RCS reduction value could reach 20.2 dBm at 0° incidence angle. It is believed that this research will pave the way for further vigorous development in the field of microwave absorption.

中文翻译：

---

通过热解策略同时控制 MOF 衍生的中空 Co3O4/Co/NC@MXene 微球的成分和结构，以实现高性能微波吸收

开发高性能微波吸波材料是解决日益严重的电磁污染问题的有效策略之一，受到了研究人员的关注。在此，研究了 TiCT MXene 和 MOF 衍生物的结构和组成控制。研究发现，Ti3CT MXene氧化生成的TiO作为低介电材料，可以有效解决Ti3CT MXene高电导率带来的阻抗失配问题。此外，具有优异介电磁性能的 MOF 衍生物通常通过高温热解获得，这也有助于 TiCT MXene 的氧化。在此，我们通过模板法和静电自组装，成功在Ti3CT MXene纳米片支撑的三维球形骨架表面合成了ZIF-67纳米粒子，并经过一段时间后得到了具有明显中空结构的CoO/Co/NC@MXene微球。步热解。这种磁性碳异质结构可以有效优化阻抗匹配并实现高效的微波吸收。 HCCM-800样品的最小反射损耗值为-71.60 dB，厚度为2.25 mm，最大有效吸收带宽在1.85 mm处达到5.14 GHz。同时，雷达截面（RCS）模拟显示，HCCM-800样品在0°入射角下的RCS降低值可达20.2 dBm。相信这项研究将为微波吸收领域的进一步蓬勃发展铺平道路。