NiCo2S4 nanosheets on 3D wood-derived carbon for microwave absorption

By S. Dong, Peitao Hu, Xiutao Li, C. Hong, Xinghong Zhang, Jiecai Han. 2020

190 citations recorded by the source corpus.

Abstract Advanced electromagnetic wave (EMW) absorbing materials with low-cost, lightweight, high absorption efficiency and wide absorption frequency are extremely desirable for solving electromagnetic radiation. Herein, an excellent microwave absorber composed of NiCo2S4 nanosheets decorated three-dimensional (3D) hierarchically porous carbon derived from biomass was successfully designed and constructed via a facile strategy for the first time. The results shown that the morphology and EMW absorption ability of 3D NiCo2S4/C hybrid composites could be synchronously tailored just by controlling the initial content of cetyltrimethyl ammonium bromide (CTAB) as a surfactant, and a substantial enhancement of microwave absorption performance could be achieved after the introduction of NiCo2S4 nanosheets, resulting from the matched impedance and the enhanced attenuation constant. The optimized NiCo2S4/C composites exhibit strong EMW absorption abilities, whose minimum reflection loss (RLmin) value reaches −64.74 dB with an ultra-thin thickness of 1.91 mm, and the effective absorption bandwidth (EAB, RL ≤  − 10 dB) is up to 5.26 GHz ranging from 9.22 to 14.48 GHz, which could also cover the entire X-band within 2.23–2.31 mm thickness. This work provides a new sight to design and prepare next-generation microwave absorbers with high absorption efficiency and wide absorption frequency through a low-cost, sustainable and effective method.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/f10074a5a09ea6307b1a4b14c88428740dec7f08