Journal
CHEMICAL ENGINEERING JOURNAL
Volume 417, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.128087
Keywords
Mn-MOF-74; Bandgap; Mixed-dimensional structures; Dielectric loss; Microwave adsorption in the full band
Categories
Funding
- National Natural Science Foundation of China [21264011, 22066017]
- program of China Scholarship Council [201708360032]
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This study investigates the influence of bandgap on the microwave dielectric behavior of Mn-MOF derivatives and successfully fabricates MOF-derived NPC composites with full-band MA performance. The three-dimensional MnO@NPC composites show excellent low-frequency MA ability, while the 1D-3D mixed-dimensional MnO2@NPC composites achieve ultra-strong MA response across the full band.
Nano-porous carbon (NPC) composites derived from metal-organic frameworks (MOFs) possess effective microwave absorption (MA) properties. However, the fabrication of MOF-derived NPC composites with full-band MA performance is challenging. In this work, the effect of the bandgap on the microwave dielectric behavior of Mn-MOF derivatives was investigated. The results demonstrated that a narrower MnO2 bandgap resulted in higher conductivity and a larger dielectric constant of the corresponding materials. The three-dimensional (3D) MnO@NPC composites achieved excellent low-frequency MA ability. The maximum reflection loss (RL) of MnO@NPC carbonized at 800 degrees C reached 54.38 dB at 5.12 GHz. The 1D-3D mixed-dimensional MnO2@NPC composites with the ultra-strong MA response in the full band were obtained by oxidizing MnO@NPC to MnO2@NPC. MnO2@NPC-800 showed superior MA capacity with the maximum RL value equal to -63.21 dB at 12.48 GHz and 2.05 mm thickness. The maximum RL values in S, C, X, Ku bands also exceeded -50 dB. Such an outstanding MA performance of MnO2@NPC-800 composite was attributed to the MnO2 presence and its multidimensional structure. This work provides the foundation for the fabrication of MOF-derived materials capable of full-band MA.
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