Deeply studied the electromagnetic wave absorption (EWA) mechanism of MoC heterostructure is crucial for realizing the application of MoC-based materials in new multifunctional integrated microwave absorbing coatings. In order to exclude the influence of special three-dimensional morphology (spherical, hollow, etc) on EWA performance, we designed the two-dimensional (2D) thick sheet-like MoC/Co@NC heterostructure that composed of molybdenum carbide (MoC), cobalt (Co) nanoparticles and nitrogen-doped carbon (NC), derived from the MoO substituted 2D sheet-like Co zeolite imidazolate frameworks (Mo/Co BIFs). The MoC/Co@NC has better EWA performance than Co@NC and MoC@NC. In the thickness range of 2∼4 mm, the effective absorption bandwidth can cover up to 10.5 GHz, and the strongest absorption can reach −48 dB. Behind the excellent EWA performance, multiple polarization relaxation and enhanced interface polarization are acting together. Moreover, the structure and interface effects of MoC/Co heterojunction are also revealed by DFT calculation. This work provides a workable methodology for manipulating the heterogeneous interface of MOFs-derived MoC based material and understanding the EWA mechanism of MoC-based heterostructure.

中文翻译：

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构建二维厚片状碳化物和钴纳米晶异质结构以实现高效电磁波吸收

深入研究MoC异质结构的电磁波吸收(EWA)机理对于实现MoC基材料在新型多功能集成微波吸收涂层中的应用至关重要。为了排除特殊的三维形貌（球形、空心等）对EWA性能的影响，我们设计了由碳化钼（MoC）组成的二维（2D）厚片状MoC/Co@NC异质结构。 、钴 (Co) 纳米粒子和氮掺杂碳 (NC)，衍生自 MoO 取代的二维片状 Co 沸石咪唑酯框架 (Mo/Co BIF)。 MoC/Co@NC 比 Co@NC 和 MoC@NC 具有更好的 EWA 性能。在2∼4 mm厚度范围内，有效吸收带宽可达10.5 GHz，最强吸收可达-48 dB。在优异的EWA性能背后，多重极化弛豫和增强的界面极化共同作用。此外，DFT计算还揭示了MoC/Co异质结的结构和界面效应。这项工作提供了一种可行的方法来操纵 MOF 衍生的 MoC 基材料的异质界面，并了解 MoC 基异质结构的 EWA 机制。