The development of a convenient methodology for syn-thesizing the hierarchically porous aerogels comprising metal-organic frameworks(MOFs)and graphene oxide(GO)building blocks that exhibit an ultralow density and uniformly distributed MOFs on GO sheets is important for various applications.Herein,we report a facile route for synthesizing MOF/reduced GO(rGO)aerogels based on the gelation of GO,which is directly initiated using MOF crystals.Free metal ions exposed on the surface of MIL-88 A nanorods act as link-ers that bind GO nanosheets to a three-dimensional porous network via metal-oxygen covalent or electrostatic interactions.The MOF/rGO-derived magnetic and dielectric aerogels Fe3O4@C/rGO and Ni-doped Fe3O4@C/rGO show notable microwave absorption(MA)performance,simultaneously achieving strong absorption and broad bandwidth at low thickness of 2.5(-58.1 dB and 6.48 GHz)and 2.8 mm(—46.2 dB and 7.92 GHz)with ultralow filling contents of 0.7 and 0.6 wt％,respectively.The microwave attenuation ability of the prepared aerogels is further confirmed via a radar cross-sectional simulation,which is attributed to the synergistic effects of their hierarchically porous structures and heterointerface engineering.This work provides an effective pathway for fabricating hierarchically porous MOF/rGO hybrid aerogels and offers magnetic and dielectric aerogels for ultralight MA.

Xiaogu Huang;Jiawen Wei;Yunke Zhang;BinBin Qian;Qi Jia;Jun Liu;Xiaojia Zhao;Gaofeng Shao

Institute of Advanced Materials and Flexible Electronics(IAMFE),School of Chemistry and Materials Science,Nanjing University of Information Science and Technology,Nanjing 210044,People's Republic of China;Department of Chemical and Biological Engineering,Monash University,Victoria 3800,Australia;School of Chemistry and Environmental Engineering,Yancheng Teachers University,Yancheng 224002,People's Republic of China;College of Field Engineering,Army Engineering University of PLA,Nanjing 210007,People's Republic of China;Hebei Key Laboratory of Inorganic Nano-Materials,College of Chemistry and Materials Science,Hebei Normal University,Shijiazhuang 050024,People's Republic of China

纳微快报（英文）

[1]Xiaogu Huang;Jiawen Wei;Yunke Zhang;BinBin Qian;Qi Jia;Jun Liu;Xiaojia Zhao;Gaofeng Shao-.Ultralight Magnetic and Dielectric Aerogels Achieved by Metal-Organic Framework Initiated Gelation of Graphene Oxide for Enhanced Microwave Absorption)[J].纳微快报（英文）,2022(07):16-31

Achieved,Gelation

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