writer：Jiqi Wang, Yuhong Cui, Fei Wu, Tariq Shah, Mudasir Ahmad, Aibo Zhang, Qiuyu Zhang
keywords：Three-layer core-shell structure Magnetic hybrid nanofibers Electromagnetic parameters regulation Impedance matching Microwave absorption
source：期刊
specific source：Carbon
Issue time：2020年

In this paper, a three-step method has been applied for preparation of Fe/Fe3O4@TCNFs@TiO2 magnetichybrid nanofibers (MHNFs) with three-layer core-shell structure. Firstly, tubular polymer nanofiberprecursors with FeCl3 embedded in axis (TPNFPs) are synthesized by a confined self-condensation systemdeveloped earlier. After high-temperature conversion, tubular magnetic carbon nanofibers loadedwith Fe nanoparticles inside (Fe@TCNFs) are obtained. Finally, TiO2 shell formation procedure is carriedout by the hydrolysis of tetrabutyl titanate, and MHNFs with different TiO2 loadings are successfully fabricated. This material possesses both magnetic and dielectric loss abilities that shows excellent microwave absorbing performance. Under filler content of 15 wt%, the minimum reflection loss reaches
44.8 dB@13.9 GHz, and the absorbing layer thickness is only 1.6 mm. In addition, the electromagnetic parameters of MHNFs can be regulated and optimized by adjusting TiO2 loading. It brings better impedance matching property and improves microwave absorbing performance. Meanwhile, the composition, structure and electromagnetic parameters of MHNFs are systematically analyzed. The microwave attenuation mechanism is revealed. This study has guiding significance for the performance optimization of existing microwave absorbers.