The rapid development of high-performance materials has garnered considerable attention in addressing electromagnetic pollution. The construction of core-shell heterostructures is an effective approach for regulating the electromagnetic parameters of absorbers. However, these heterostructures usually lack a direct channel for charge transport between the core phase and the adhesive shell phase. Herein, FeAlB@FeAl-layered double hydroxides with core-shell heterostructures were prepared using a top-down approach. The tightly connected FeAl-LDHs nanosheets to the FeAlB parent phase improved electronic transport. Compared with raw FeAlB, the spherical absorber with an embroidered structure demonstrated stronger reflection loss (-15.6 dB for FeAlB, −58.6 dB for FeAlB@FeAl-LDHs) and a broader effective absorption bandwidth (2.2 GHz for FeAlB, 3.6 GHz for FeAlB@FeAl-LDHs) due to the enhanced dielectric and magnetic losses. This study presents a practical method for designing new controllable core-shell heterostructures for electromagnetic wave-absorbing materials.

中文翻译：

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具有核壳异质结构的Fe2AlB2@FeAl层状双氢氧化物用于电磁波吸收

高性能材料的快速发展在解决电磁污染方面引起了广泛关注。构建核壳异质结构是调节吸波体电磁参数的有效途径。然而，这些异质结构通常缺乏核相和粘合剂壳相之间电荷传输的直接通道。在此，采用自上而下的方法制备了具有核壳异质结构的 FeAlB@FeAl 层状双氢氧化物。 FeAl-LDHs 纳米片与 FeAlB 母相紧密连接，改善了电子传输。与原始FeAlB相比，具有刺绣结构的球形吸波体表现出更强的反射损耗（FeAlB为-15.6 dB，FeAlB@FeAl-LDHs为-58.6 dB）和更宽的有效吸收带宽（FeAlB为2.2 GHz，FeAlB@为3.6 GHz） FeAl-LDHs）由于介电和磁损耗增强。这项研究提出了一种设计用于电磁波吸收材料的新型可控核壳异质结构的实用方法。