Journal
ADVANCED ENGINEERING MATERIALS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202200998
Keywords
graphene aerogel; hierarchical porosity; holey graphene; microwave absorption
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Funding
- program of Science and Technology International Cooperation Project of Qinghai Province [2022-HZ-8110]
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Graphene aerogels with hierarchical porosity structures composed of nanopores in the plane of graphene oxide sheets and macropores in aerogel have shown high-performance microwave absorption capability. The efficient absorption bandwidth can reach 7.1 GHz and the minimum reflection loss is -36.4 dB. The hierarchical porosity, interfacial polarization, multiple reflections, and matched impedance contribute to the improved microwave absorption performance. Therefore, the design of high-performance radar absorption materials inspired by low filling content, low density, and special hierarchical porosity is feasible.
Graphene aerogels ha shown fabulous capability in microwave absorption (MA) because of their high surface area, low density, and great chemical stability. To fully exploit its MA capability, the microstructural regulation of graphene aerogels should be carefully studied. Herein, 3D holey-reduced graphene aerogels (3D-HGAs) with hierarchical porosity structures composed of nanopores in the plane of graphene oxide (GO) sheets and macropores in aerogel for high-performance absorbing materials are prepared. The efficient absorption bandwidth (EAB) of 3D-HGA can reach 7.1 GHz and the minimum reflection loss is -36.4 dB, showing a significant increase contrasted with 3D-reduced GO aerogels (3D-RGA). Hierarchical porosity, interfacial polarization, multiple reflections, and matched impedance are all benefits of promoting MA performance. Consequently, the low filling content, low density, and special hierarchical porosity inspire the design of high-performance radar absorption materials.
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