Fabrication of lightweight and high-efficiency microwave absorption materials with tunable electromagnetic properties still remains challenging to meet the increasing demand for portable electronics. In this work, MOF derivatives/MXene crosslinking networks were successfully synthesized through connecting flower-like MOF derivatives with 2D flexible MXene flakes. The combination of the enhanced interfacial polarization derived from the flower-like structure and the conductivity loss originating from the network structure endows the composites with remarkable microwave absorption (MA) performance. The sample of CoO/Ti₃C₂T_x MXene-15 (COT-15) with 5 wt% loading exhibits a minimum reflection loss (RL_min) of −52.23 dB with a corresponding effective absorption bandwidth (EAB) of 4.88 GHz at 1.90 mm. The introduction of Ni can effectively optimize impedance matching and regulate the permittivity with a downward trend with the increase of Ni addition. CoO/NiCo₂O₄/Ti₃C₂T_x MXene (CN₁OT) with various filler loadings can achieve excellent MA properties despite adjusting the adherent MXene content in a large range. For instance, a strong RL_min of −47.17 dB and a wide EAB of 5.44 GHz are obtained for CN₁OT-15 at 2.90 mm, when the filler loading in PVDF is only 5 wt%. Besides, CN₁OT-15 (10 wt%) possesses an optimal RL_min of −58.37 dB and a broad EAB of 4.24 GHz at the thickness of 1.50 mm. Our work manifests that fabrication of 3D crosslinking networks based on MOF derivatives may be an effective strategy in constructing lightweight and highly efficient microwave absorbents, and promoting the development of heterobimetallic oxides in the MA field.

中文翻译：

---

MXene 调制的分层花状 MOF 衍生物的 3D 交联网络，具有超高效的微波吸收特性

制造具有可调电磁特性的轻质高效微波吸收材料仍然具有挑战性，以满足对便携式电子产品日益增长的需求。在这项工作中，通过将花状 MOF 衍生物与二维柔性 MXene 薄片连接，成功合成了 MOF 衍生物/MXene 交联网络。源自花状结构的增强界面极化和源自网络结构的电导率损失相结合，使复合材料具有显着的微波吸收（MA）性能。负载为 5 wt%的 CoO/Ti ₃ C ₂ T _x MXene-15 (COT-15)样品表现出最小的反射损耗 (RL _min) 为 −52.23 dB，相应的有效吸收带宽 (EAB) 在 1.90 mm 处为 4.88 GHz。Ni的引入可以有效优化阻抗匹配，调节介电常数随着Ni添加量的增加呈下降趋势。CoO/NiCo ₂ O ₄ /Ti ₃ C ₂ T _x MXene (CN ₁ OT) 具有各种填料负载量，尽管在较大范围内调整粘附的 MXene 含量，但仍可实现优异的 MA 性能。例如，当 PVDF 中的填料负载仅为 5 wt% 时，CN ₁ OT-15 在 2.90 mm 处获得了 -47.17 dB的强 RL _min和 5.44 GHz 的宽 EAB 。此外，CN ₁OT-15 (10 wt%)在厚度为 1.50 mm 时具有-58.37 dB的最佳 RL _min和 4.24 GHz 的宽 EAB。我们的工作表明，基于 MOF 衍生物的 3D 交联网络的制造可能是构建轻质高效微波吸收剂的有效策略，并促进 MA 领域中异质双金属氧化物的发展。