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Waste cotton-derived magnetic porous carbon for high-efficiency microwave absorption

2018; Elsevier BV; Volume: 9; Linguagem: Inglês

10.1016/j.coco.2018.06.007

2452-2139

Yun Wei, Haojie Liu, Shengchao Liu, Miaomiao Zhang, Yupeng Shi, Jingwei Zhang, Lei Zhang, Chunhong Gong,

Metamaterials and Metasurfaces Applications

In this study, using nickel nitrate and waste cotton as precursors, porous carbon combined with well-dispersed Ni nanoparticles were formed via an in-situ growth strategy. Due to the distinction of complex permittivity among different components, the expanded interface in the Ni/C heterostructure could improve the interfacial polarization relaxation, which lead to the enhanced dielectric loss and EM absorbing capability. The results show that excellent microwave absorption properties could be exhibited over a wide frequency range with a filler loading of only 10 wt.%, which compete well with what has been observed in the carbon-based composites with much higher filler loadings. This work provides a low-cost and effective approach for lightweight and high-efficiency microwave absorption, which also greatly facilitates the recycling of waste cotton.