Controllable Fabrication of SiC@C-Fe3O4 Hybrids and Their Excellent Electromagnetic Absorption Properties

Abstract

In this work, a batch of novel ternary hybrids (SiC@C-Fe3O4), characterized by SiC nanowires core, carbon shell, and adhered Fe3O4 nanoparticles were controllably synthesized via surface carbonization of SiCnw followed by hydrothermal reaction. Carbon, which was derived from SiC with nanometer thickness, possesses an amorphous structure, while Fe3O4 nanoparticles are in a crystalline state. Simultaneously, the inducement of Fe3O4 nanoparticles can provide significant magnetic loss, which is well-tuned by changing the molar content of iron precursors (FeCl3·6H2O and FeCl2·4H2O). SiC@C-Fe3O4 hybrids show great electromagnetic absorption performance owing to the synergy effect of dielectric and magnetic losses. The minimum refection loss can reach to −63.71 dB at 11.20 GHz with a thickness of 3.10 mm, while the broad effective absorption bandwidth (EAB) can reach to 7.48 GHz in range of 10.52–18.00 GHz with a thickness of 2.63 mm. Moreover, the EAB can also cover the whole X band and Ku band. The outstanding performance of the obtained material implys that it is a promising candidate as an electromagnetic absorber.

ZnO-decorated SiC@C hybrids with strong electromagnetic absorption

“…These phenomena indicate that the EM absorption could be well controlled by adjusting the fractions of pristine materials and filler load of the absorbers. A comprehensive comparison with materials from our previous works (SiC@C and SiC@C-Fe 3 O 4 ) and other reported materials (such as ZnO-decorated SiC nw or graphene/SiC) [ 16 , 24 , 34 – 35 ] shows that the SCZ samples possess some advantages regarding lower RL min , broader EAB, and less filler load. This might enable a wide application as microwave absorbers as elaborated in this study.…”

Electromagnetic Absorption by Magnetic Oxide Nanomaterials: A Review

“…Wave-absorbing materials can realize the stealth function of military fighter jets and protect human health from unwanted electromagnetic radiation. In addition, with the rapid development of smart wearable electronic devices, the demand for flexible shielding electronic skin that can monitor physiological signals and protect the human body from electromagnetic radiation is also increasing, and wave-absorbing materials with excellent wave-absorbing properties of “thin, light, wide, and strong” are the key to solving the above demand. − …”