Fe2AlB2@FeAl layered double hydroxides with core-shell heterostructures for electromagnetic wave absorption

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, Fe 2 AlB 2 @FeAl-layered double hydroxides with core-shell heterostructures were prepared using a top-down approach. The tightly connected FeAl-LDHs nanosheets to the Fe 2 AlB 2 parent phase improved electronic transport. Compared with raw Fe 2 AlB 2 , the spherical absorber with an embroidered structure demonstrated stronger reflection loss (-15.6 dB for Fe 2 AlB 2 , −58.6 dB for Fe 2 AlB 2 @FeAl-LDHs) and a broader effective absorption bandwidth (2.2 GHz for Fe 2 AlB 2 , 3.6 GHz for Fe 2 AlB 2 @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.