Wang Xin, Ou Pinxi, Zheng Qi, Wang Lianjun, Jiang Wan
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China.
Engineering Research Center of Advanced Glasses Manufacturing Technology, Ministry of Education, Donghua University, Shanghai, 201620, P. R. China.
Small. 2024 Apr;20(15):e2307473. doi: 10.1002/smll.202307473. Epub 2023 Nov 27.
With the advent of wireless technology, magnetic-carbon composites with strong electromagnetic wave (EMW) absorption capability in low-/middle-frequency range are highly desirable. However, it remains challenging for rational construction of such absorbers bearing multiple magnetic components that show uniform distribution and favorable magnetic loss. Herein, a facile metal-oxo cluster (MOC) precursor strategy is presented to produce high-efficiency magnetic carbon composites. Nanosized MOC Fe shelled with organic ligands is employed as a novel magnetic precursor, thus allowing in situ formation and uniform deposition of multicomponent magnetic Fe/FeO@FeC and Fe/FeO nanoparticles on graphene oxides (GOs) and carbon nanotubes (CNTs), respectively. Owing to the good dispersity and efficient magnetic-dielectric synergy, quaternary Fe/FeO@FeC-GO exhibits strong low-frequency absorption with RL of -53.5 dB at C-band and absorption bandwidth covering 3.44 GHz, while ultrahigh RL of -73.2 dB is achieved at X-band for ternary Fe/FeO-CNT. The high performance for quaternary and ternary composites is further supported by the optimal specific EMW absorption performance (-15.7 dB mm and -31.8 dB mm) and radar cross-section reduction (21.72 dB m and 34.37 dB m). This work provides a new avenue for developing lightweight low-/middle-frequency EMW absorbers, and will inspire the investigation of more advanced EMW absorbers with multiple magnetic components and regulated microstructures.
随着无线技术的出现，在低/中频范围内具有强电磁波（EMW）吸收能力的磁性碳复合材料备受青睐。然而，合理构建具有均匀分布和良好磁损耗的含多种磁性成分的此类吸收剂仍然具有挑战性。在此，提出了一种简便的金属氧簇（MOC）前驱体策略来制备高效磁性碳复合材料。用有机配体包覆的纳米级MOC Fe被用作新型磁性前驱体，从而分别允许多组分磁性Fe/FeO@FeC和Fe/FeO纳米颗粒在氧化石墨烯（GOs）和碳纳米管（CNTs）上原位形成并均匀沉积。由于良好的分散性和有效的磁电协同作用，四元Fe/FeO@FeC-GO在C波段表现出强低频吸收，反射损耗（RL）为-53.5 dB，吸收带宽覆盖3.44 GHz，而三元Fe/FeO-CNT在X波段实现了-73.2 dB 的超高RL。四元和三元复合材料的高性能进一步得到最佳比EMW吸收性能（-15.7 dB·mm和-31.8 dB·mm）以及雷达散射截面缩减（21.72 dB·m和34.37 dB·m）的支持。这项工作为开发轻质低/中频EMW吸收剂提供了一条新途径，并将激发对具有多种磁性成分和可控微观结构的更先进EMW吸收剂的研究。
