Nano-Micro Letters ( IF 31.6 ) Pub Date : 2022-04-19 , DOI: 10.1007/s40820-022-00851-3 Xiaogu Huang 1 , Jiawen Wei 1 , Yunke Zhang 1 , BinBin Qian 2, 3 , Qi Jia 4 , Jun Liu 4 , Xiaojia Zhao 5 , Gaofeng Shao 1
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Highlights
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Metal–organic frameworks (MOFs) are used to directly initiate the gelation of graphene oxide (GO), producing MOF/rGO aerogels.
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The ultralight magnetic and dielectric aerogels show remarkable microwave absorption performance with ultralow filling contents.
Abstract
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.
中文翻译：
金属-有机骨架引发氧化石墨烯凝胶化以增强微波吸收实现的超轻磁性和介电气凝胶
强调
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金属有机框架 (MOF) 用于直接引发氧化石墨烯 (GO) 的凝胶化，从而产生 MOF/rGO 气凝胶。
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超轻磁性和介电气凝胶显示出卓越的微波吸收性能，填充量超低。
抽象的
开发一种方便的方法来合成包含金属有机框架 (MOF) 和氧化石墨烯 (GO) 结构单元的分级多孔气凝胶，这些气凝胶在 GO 片材上表现出超低密度和均匀分布的 MOF，对于各种应用都很重要。在此，我们报告了一种基于 GO 凝胶化合成 MOF/还原 GO (rGO) 气凝胶的简便途径，它直接使用 MOF 晶体引发。暴露在 MIL-88A 纳米棒表面的游离金属离子充当连接剂，通过金属-氧共价或静电相互作用将 GO 纳米片结合到三维多孔网络。MOF/rGO 衍生的磁性和介电气凝胶 Fe 3 O 4 @C/rGO 和 Ni 掺杂的 Fe 3 O 4@C/rGO 显示出显着的微波吸收 (MA) 性能，同时在 2.5（− 58.1 dB 和 6.48 GHz）和 2.8 mm（− 46.2 dB 和 7.92 GHz）的低厚度下实现强吸收和宽带宽，超低填充含量为 0.7和 0.6 重量％。通过雷达截面模拟进一步证实了制备的气凝胶的微波衰减能力，这归因于它们的分级多孔结构和异质界面工程的协同效应。这项工作为制造分级多孔 MOF/rGO 杂化气凝胶提供了一种有效途径，并为超轻 MA 提供了磁性和介电气凝胶。
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