Flower-like NiCo<sub>2</sub>S<sub>4</sub> Microspheres Based on Nanosheet Self-Assembly Anchored on 3D Biomass-Derived Carbon for Efficient Microwave Absorption
Peitao Hu, Peitao Hu, Shun Dong, Xiutao Li, Jingmao Chen, Ping Hu, Ping Hu
Abstract
Possessing both dielectric loss and magnetic loss is desirable for high-efficiency microwave absorbers to achieve promising impedance matching and high attenuation constant. In this work, biomass-derived carbon (BDC)/NiCo2S4 (BNCS) composites were successfully synthesized through growing flower-like NiCo2S4 microspheres on the surface of a three-dimensional (3D) BDC framework using a low-cost, facile, and sustainable process. The results indicated that the precursor dosage had a significant impact on the microstructures, surface morphologies, and electromagnetic parameters of the materials, and the introduction of NiCo2S4 nanosheets obviously enhanced impedance matching and attenuation constant, leading to a strong absorption performance. The minimum reflection loss (RLmin) of BNCS reached −62.74 dB at 2.24 mm and an effective bandwidth of 7.62 GHz at 1.96 mm was achieved, which was much better than that of BDC (−8.41 dB at 2.97 mm). It was apparent that BNCS could serve as a promising candidate for next-generation high-performance microwave absorbers with strong absorption, wide bandwidth, and thin thickness.