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Fe₃O₄ nanoparticles decorated on a CuS platelet-based sphere: a popcorn chicken-like heterostructure as an ideal material against electromagnetic pollution

Sun, Xiaodong, Sui, Mingxu, Cui, Guangzhen, Li, Ling, Li, Xiaopeng, Lv, Xuliang, Wu, Fan, Gu, Guangxin
RSC advances 2018 v.8 no.31 pp. 17489-17496
absorption, energy, human health, iron oxides, irradiation, magnetism, microstructure, nanoparticles, pollution, popcorn, temperature
Electromagnetic irradiation has caused environmental pollution and harmful effects on human health. The use of effective materials to attenuate electromagnetic energy is urgently required. In this study, Fe₃O₄ nanoparticles (NPs) decorated on a CuS platelet-based sphere (CuS/Fe₃O₄) with popcorn chicken-like micromorphology were synthesized through a solvothermal deposition method. The effects of reaction temperature and quantity of Fe₃O₄ NPs on the heterostructures, morphologies and electromagnetic absorption (EA) properties of the heterostructures were investigated. CuS/Fe₃O₄ heterostructures exhibited remarkable enhancement in comparison with pure Fe₃O₄ NPs and the CuS platelet-based sphere. With the contribution from dielectric and magnetic losses, a CuS/Fe₃O₄ heterostructure-loaded composite could achieve a minimum reflection loss (RL) of −61.32 dB at 14.00 GHz and an effective EA bandwidth (≤−10 dB) of 4.15 GHz at a thickness of only 1.5 mm simultaneously. The current study indicates that the CuS/Fe₃O₄ heterostructures can potentially be applied as advanced electromagnetic absorbers.