Core-shell structured Fe/Fe3O4@TCNFs@TiO2 magnetic hybrid nanofibers: preparation and electromagnetic parameters regulation for enhanced microwave absorption
作者：Jiqi Wang, Yuhong Cui, Fei Wu, Tariq Shah, Mudasir Ahmad, Aibo Zhang, Qiuyu Zhang
關鍵字：Three-layer core-shell structure Magnetic hybrid nanofibers Electromagnetic parameters regulation Impedance matching Microwave absorption
論文來源：期刊
具體來源：Carbon
發(fā)表時間：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.