Two-dimensional materials have already been considered as promising microwave absorbing materials due to their unique and charming layered structure. However, it is difficult to achieve excellent absorption performance at a thin thickness. Herein, the polyhedral Fe₃O₄ was prepared in-situ using sheet-shaped carbonyl iron powder, which not only retained the sheet-like structure of carbonyl iron powder but also formed polyhedral Fe₃O₄ on the surface. By tuning the ratio of Ti₃C₂T_X/carbonyl iron powder/Fe₃O₄ microwave absorption capabilities in terms of the minimum reflection loss (RL) value and absorber thickness could be readily optimized. This result is verified by the explanation of the quarter-wavelength law and impedance matching degree. Specifically, when the thickness of the C–F–M 10% composite material is 2.2 mm, the minimum RL value at 9.16 GHz is − 52.1 dB, and the effective absorption bandwidth is 3.32 GHz. The thickness of the C–F–M 15% composite is 2.0 mm, the minimum RL value at 11.12 GHz is − 49.9 dB, and the effective absorption bandwidth is 4.59 GHz. Therefore, Ti₃C₂T_X composite material is expected to become a candidate material for ultra-thin and lightweight absorbers.

二维材料由于其独特而迷人的层状结构，已被认为是很有前途的微波吸收材料。然而，在较薄的厚度下难以实现优异的吸收性能。在此，采用片状羰基铁粉原位制备多面体Fe ₃ O ₄，既保留了羰基铁粉的片状结构，又在表面形成了多面体Fe ₃ O ₄。通过调整Ti ₃ C ₂ T _X /羰基铁粉/Fe ₃ O ₄的比例可以很容易地优化在最小反射损耗 (RL) 值和吸收体厚度方面的微波吸收能力。这一结果通过四分之一波长定律和阻抗匹配度的解释得到验证。具体而言，当 C-F-M 10% 复合材料的厚度为 2.2 mm 时，9.16 GHz 处的最小 RL 值为 - 52.1 dB，有效吸收带宽为 3.32 GHz。C-F-M 15% 复合材料的厚度为 2.0 mm，11.12 GHz 处的最小 RL 值为 − 49.9 dB，有效吸收带宽为 4.59 GHz。因此，将Ti ₃ c ^ ₂ Ť _X复合材料有望成为用于超薄且重量轻吸收剂的候选材料。