Abstract
Lightweight, high-efficiency and low-cost electromagnetic wave absorption (EMA) material is playing an increasingly critical role in the areas of mobile communications, electronic machines and military science and technology. Heterostructures of biomass-derived porous carbon (BPC) from chestnut needle coated by VO 2 were constructed. Microstructure, morphology as well as EMA performance of as-prepared VO 2 /BPC composites were explored. The special porous structure of BPC-based composites boosted multi-reflections and scattering of EM wave. The higher surface area provided more channels for charge transfer, benefiting the dissipation of EM wave energy. The formed VO 2 was uniformly dispersed in BPC matrix resulting in more polarization loss. Additionally, the reduzate of VO 2 improved the impedance matching further optimizing the EMA performance immensely. With the joint action of excellent impedance matching and attenuation capacity, the VO 2 /BPC composites exhibited favorable EMA performance that the minimum reflection loss of −54.0 dB was achieved with wide effective absorption bandwidth of 2.5 GHz. The obtained results suggest the VO 2 /BPC composites would be a hopeful candidate for high-efficient, lightweight and green EMA material. • Preparation of EMA materials derived from natural biomass carbon. • Improved EMA performance was achieved that RL min was −54 dB. • The impedance matching and polarization loss was enhanced drastically by introduction of VO 2 . • The EMA mechanism was investigated.
Published Version
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