Highly efficient and broad electromagnetic wave absorbers tuned via topology-controllable metal-organic frameworks
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Published online 12 June 2020 | https://doi.org/10.1007/s40843-020-1333-9
Highly efficient and broad electromagnetic wave absorbers tuned via topology-controllable metalorganic frameworks Peng Miao, Jianxin Chen, Yusheng Tang, Kai-Jie Chen and Jie Kong ABSTRACT Advanced electromagnetic (EM) wave absorbing materials with strong absorption and broad bandwidth are important for military stealth and elimination of microwave pollution in consumers’ electronics. Metal organic framework (MOF)-derived metal/carbon hybrids with ordered structure are significantly urgent in this field. In this contribution, we presented a design strategy of hollow cage-like or solid boxlike magnetic/dielectric Fe/Co/C and dielectric Fe/Mn/C EM wave absorbing nanomaterials via pyrolyzing Prussian blue’s analogs with controllable topology and phase composition. The solid box-like Fe/Co/C and hollow cage-like Fe/Mn/C showed favorable absorption property with a broad effective absorption bandwidth (EAB) and a low reflection loss (RL). Especially, the EAB of 8.8 GHz at a thickness of 2.5 mm for solid box-like Fe/Co/C nanocomplex prepared at 900°C is a new record for this type of materials. The design and tuning strategy for EM wave absorbers derived from topology-controllable MOF is important for EM functional materials possessing great potential in military stealth and consumers’ electronics. Keywords: electromagnetic wave absorber, MOF, Prussian blue’s analogs, topology, pyrolysis
INTRODUCTION Advanced electromagnetic (EM) wave absorbing materials with strong absorption, broad bandwidth, thin thickness and low density have received numerous attentions due to urgent demand in military stealth and elimination of microwave pollution or radiation in consumers’ electronics and base stations of wireless networks [1–3]. Various magnetic materials, such as ferrites, Fe-, Co-, Nibased nanoparticles and alloys, as well as carbon family materials including carbon fibers, carbon nanotubes and
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graphenes were mainly utilized to match the engineering applications of EM wave absorbing materials in form of coating, sealing or composites [4,5]. Metal-organic frameworks (MOFs) integrated the features of organic-inorganic hybrids, high porosity, ultrahigh specific surface area and tunable topological structure [6,7]. Their diversity of compositions and topological structures give favorable functionalities with great potential in gas separation/storage, catalysis and biomedicine [8–11], etc. In our previous work [6], a synergistic sorbent separation method was presented for the one-step production of polymer-grade C2H4 from ternary (C2H2/C2H6/C2H4) or quaternary (CO2/C2H2/C2H6/C2H4) gas mixtures by using MOFs. Especially, MOF-derived metal/carbon composites after pyrolysis have drawn significant attention in various fields [12–14]. They might possess desirable EM wave absorbing or shielding ability. As expected, the derived Co/C composite with well-dispersed magnetic cobalt nanoparticles inherited the topological structure of ZIF-67 crystals, showing effectiv
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