Refining the electromagnetic wave absorption characteristics of traditional metal–organic framework(MOF)-derived carbon composites remains a challenge because of their discontinuous conductive path.To overcome this l...Refining the electromagnetic wave absorption characteristics of traditional metal–organic framework(MOF)-derived carbon composites remains a challenge because of their discontinuous conductive path.To overcome this limitation,in this work,MOF-derived hierarchical Cu_(9)S_(5)/C nanocomposite fibers are fabricated by electrospinning and subsequent carbonization-sulfurization process.Morphological analyses show that MOF-derived octahedral Cu_(9)S_(5)/C particles are evenly monodis-persed inside carbonaceous fibers.This configuration creates a unique hierarchical structure,ranging from Cu_(9)S_(5)particle embedding,MOF-derived skeleton,to a three-dimensional network.The optimized composite fibers(Cu_(9)S_(5)/C-40)exhibit extraordinary electromagnetic wave absorption performance at a low mass fraction(20 wt%):the minimum reflection loss value reaches-69.6 dB,and the maximum effective absorption bandwidth achieves 5.81 GHz with an extremely thin thick-ness of only 1.83 mm.Systematic investigations demonstrate that constructing the three-dimensional conductive network to connect MOF derivatives is crucial for activating performance enhancement.The unique nano-micro hierarchical structure synergized with elaborate-configured components endows the materials with optimal impedance matching and amplifies the loss capacity of each part.This work provides a reliable example and theoretical guidance for fabricating new-generation high-efficiency MOF-derived fibrous electromagnetic wave absorbers.展开更多
基金supported by the Natural Science Foundation of Shandong Province(ZR2021ME194,2022TSGC2448,2023TSGC0545)the key research and development program of Shandong Province(2021ZLGX01).
文摘Refining the electromagnetic wave absorption characteristics of traditional metal–organic framework(MOF)-derived carbon composites remains a challenge because of their discontinuous conductive path.To overcome this limitation,in this work,MOF-derived hierarchical Cu_(9)S_(5)/C nanocomposite fibers are fabricated by electrospinning and subsequent carbonization-sulfurization process.Morphological analyses show that MOF-derived octahedral Cu_(9)S_(5)/C particles are evenly monodis-persed inside carbonaceous fibers.This configuration creates a unique hierarchical structure,ranging from Cu_(9)S_(5)particle embedding,MOF-derived skeleton,to a three-dimensional network.The optimized composite fibers(Cu_(9)S_(5)/C-40)exhibit extraordinary electromagnetic wave absorption performance at a low mass fraction(20 wt%):the minimum reflection loss value reaches-69.6 dB,and the maximum effective absorption bandwidth achieves 5.81 GHz with an extremely thin thick-ness of only 1.83 mm.Systematic investigations demonstrate that constructing the three-dimensional conductive network to connect MOF derivatives is crucial for activating performance enhancement.The unique nano-micro hierarchical structure synergized with elaborate-configured components endows the materials with optimal impedance matching and amplifies the loss capacity of each part.This work provides a reliable example and theoretical guidance for fabricating new-generation high-efficiency MOF-derived fibrous electromagnetic wave absorbers.
