Boosted electromagnetic wave absorption performance from synergistic induced polarization of SiCNWs@MnO2@PPy heterostructures
Meng Zhang, Laibin Zhao, Wenxin Zhao, Ting Wang, Liying Yuan, Yuying Guo, Yuxin Xie, Tingting Cheng, Alan Meng, Zhenjiang Li
Abstract
In the last decade, electromagnetic pollution has caused people’s considerable attention. Developing absorbing material with low cost, lightweight, simple preparation, and high electromagnetic attenuation efficiency has become a feasible means to deal with this problem. In this work, core-shell SiCNWs@MnO2@PPy (NWs: nanowires, PPy: polypyrrole) heterostructures composed of SiC nanowires core, MnO2 nanosheets inter-layer, and PPy coating were successfully prepared through chemical vapor deposition and two-step electrodeposition process. Taking advantage of the interfacial polarization and dipole polarization, the obtained product displays excellent electromagnetic wave absorption performances with the minimum reflection loss (RLmin) of −50.59 dB when the matching thickness is 2.41 mm, and the optimal effective absorption bandwidth (EAB) value reaches to 6.64 GHz at a matching thickness of 2.46 mm, revealing that the SiCNWs@MnO2@PPy nanocomposite could be served as a promising electromagnetic wave absorbing material. On the basis of systematic analysis concerning the electromagnetic parameters, the dissipation process of the incident electromagnetic wave was demonstrated reasonably, which may provide a referable preparation strategy for novel heterostructures, especially nonmagnetic lightweight absorbing material.