<i>In situ</i> anchoring of Fe<sub>3</sub>O<sub>4</sub>/CNTs hybrids on basalt fiber for efficient electromagnetic wave absorption
Tiantian Si, Shuai Xie, Zhijiang Ji, Zihao Wu, Chao Ma, Junyu Wu, Jing Wang
Abstract
Abstract The development of practical and efficient electromagnetic wave (EMW) absorbing materials is a challenging research problem. A mussel-inspired molecular structure regulation strategy using polydopamine to increase the roughness and functional groups of basalt fiber (BF) surface, which can improve the fiber interfacial adhesion. Herein, a novel BF-Fe 3 O 4 /CNTs heterostructure is synthesized through a dip-coating adsorption process. The three-dimensional network structure of Fe 3 O 4 /CNTs hybrid in situ anchored on the surface of BF, which endows the composite to have good intrinsic magnetic and dielectric properties. Modulation of EMW absorption performance by controlling the addition of CNTs, the minimum RL of BF-Fe 3 O 4 /7C reaches to −40.57 dB at a thickness of 1.5 mm with CNTs addition of 7%. The enhanced EMW absorption performance of BF-Fe 3 O 4 /7C heterostructure may be attributed to the synergistic effects of interfacial polarization between the hollow magnetic Fe 3 O 4 spheres and CNTs, conduction loss, magnetic resonance loss and multiple reflection/scattering inside the BF. This work provides a simple pathway to design EMW absorbing materials with good environmental stability.