As a typical 2D (two dimensional) material, Ti₃C₂T_x, has been used as a promising microwave absorber (MA) because of its massive interface architecture, abundant natural defects, and chemical surface functional groups. However, its single dielectric-type loss and excessive high conductivity seriously restrict the further enhancement of MA performance. Herein, we first describe a simple spray-drying routine to reshape the 2D MXene into a confined and magnetized microsphere with tightly embedded Fe₃O₄ nanospheres (designated as M/F), contributing to the enhanced specific interfaces and strong dielectric polarization. These Fe₃O₄ magnetic units are highly dispersed into the dielectric Mxene framework, leading to the optimized impedance balance and electromagnetic coordination capability. This composite way effectively exceeds the conventionally physical mixing, simple loading, and local phase separation method. Meanwhile, strong magnetic loss capability with significantly improved magnetic flux line density is achieved from microscale MXene and nanoscale Fe₃O₄, confirming our 3D multiscale magnetic coupling network. Accordingly, the M/F composites hold distinct microwave absorption property with the strong reflection loss (−50.6 dB) and effective absorption bandwidth (4.67 GHz) at the thickness as thin as only 2 mm. Our encouraging strategy provides important designable implications for MXene-based functional materials and high-performance absorbers.

中文翻译：

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具有多尺度磁耦合和增强极化界面的磁化MXene微球，用于通过喷雾干燥法吸收不同的微波

作为一种典型的二维（二维）材料，Ti ₃ C ₂ T _x由于其庞大的界面结构，丰富的自然缺陷和化学表面官能团而被用作有前途的微波吸收剂（MA）。但是，其单一的介电型损耗和过高的电导率严重限制了MA性能的进一步提高。在这里，我们首先描述一个简单的喷雾干燥程序，以将2D MXene重塑成具有紧密嵌入的Fe ₃ O ₄纳米球（指定为M / F）的密闭磁化微球，从而有助于增强比界面和强介电极化作用。这些Fe ₃ O ₄磁性单元高度分散在介电质Mxene框架中，从而优化了阻抗平衡和电磁协调能力。这种复合方式有效地超越了常规的物理混合，简单的加载和局部相分离的方法。同时，通过微米级MXene和纳米级Fe ₃ O ₄获得了强大的磁损耗能力，显着提高了磁通线密度，确认了我们的3D多尺度磁耦合网络。因此，M / F复合材料在厚度仅为2 mm的情况下仍具有独特的微波吸收性能，具有很强的反射损耗（-50.6 dB）和有效吸收带宽（4.67 GHz）。我们令人鼓舞的策略为基于MXene的功能材料和高性能吸收剂提供了重要的设计意义。