writer：Zhang, Yunfei., Li, Yulong., Wei, Mengmeng., Yang, Dengtao., Zhang, Qiuyu., & Zhang, Baoliang
keywords：Nanotubes，Magnetic materials，Core-shell structure，MoS2 nanosheets，Electromagnetic wave absorption
source：期刊
specific source：Journal of Materials Science & Technology
Issue time：2022年

In this study, a new lightweight one-dimensional absorber Co@NC@MoS2 was designed and prepared. Firstly, polydopamine (PDA) was coated by oxidative self-polymerization with cobalt-nitrilotriacetic acid chelate nanowires (Co-NTAC) as template. Then core-shell structured magnetic hierarchical nanotubes (Co@PDA@MoS2) were prepared by one-step hydrothermal method. After thermal annealing, PDA layer was transformed into nitrogen doped carbon layer (NC) to obtain the efficient microwave absorber Co@NC@MoS2. The removal of template and growth of MoS2 were completed simultaneously, the preparation process was simplified. Because of its good magnetic loss and dielectric loss, Co@NC@MoS2 shows excellent microwave absorption performance. Under filler content of 15 wt.%, the minimum reflection loss (RLmin) can reach -61.97 dB@9.2 GHz, and the effective absorption bandwidth (EAB) is 5.6 GHz. The electromagnetic parameters of Co@NC@MoS2 can be further adjusted by changing the load of MoS2. Meanwhile, the structure and composition of Co@NC@MoS2 were systematically analyzed. The influence of the microstructure on the microwave absorbing properties was investigated, and the microwave attenuation mechanism is revealed. As an efficient and lightweight absorber, Co@NC@MoS2 has potential application value in the construction of new stealth coatings.