• 文献标题:   Ultralight Magnetic and Dielectric Aerogels Achieved by Metal-Organic Framework Initiated Gelation of Graphene Oxide for Enhanced Microwave Absorption
  • 文献类型:   Article
  • 作  者:   HUANG XG, WEI JW, ZHANG YK, QIAN BB, JIA Q, LIU J, ZHAO XJ, SHAO GF
  • 作者关键词:   magnetic dielectric aerogel, metalorganic framework, gelation mechanism, microwave absorption, radar crosssectional simulation
  • 出版物名称:   NANOMICRO LETTERS
  • ISSN:   2311-6706 EI 2150-5551
  • 通讯作者地址:  
  • 被引频次:   45
  • DOI:   10.1007/s40820-022-00851-3
  • 出版年:   2022

▎ 摘  要

The development of a convenient methodology for synthesizing 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-88A nanorods act as linkers 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.