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.
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