期刊
CHEMICAL ENGINEERING JOURNAL
卷 433, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.134496
关键词
Aerogel microspheres; Core-shell bilayer struture; Sequential microwave absorption; Impedance matching; Electromagnetic simulation
资金
- National Natural Science of China (NSFC) [51903213, 5217130190]
- Science and Technology Planning Project of Sichuan Province [2020YFH0053]
- Central Government Guides the Local Science and Technology Development Special Funds to freely explore basic research projects [2021Szvup124]
- Fundamental Research Funds for Central Universities [2682021GF004]
Graphene-based aerogels with core-shell bilayer structure, shaped by coaxial electrospinning, exhibit high-performance microwave absorption (MA) due to enhanced impedance matching and electromagnetic wave propagation. The optimized absorbers show a minimum reflection loss of -61 dB at 13.84 GHz and an effective absorption bandwidth of 6.88 GHz, which can be further expanded to 7.52 GHz by adjusting the core-shell ratio.
Graphene-based aerogels have been attracted wide attention in microwave absorption (MA) for their lightweight and high-efficient absorption. However, the assembly design of their shape and structure is still lacking, bringing obstacles to the optimization of MA. Herein, we applied coaxial electrospinning to shape aerogel monoliths into aerogel microspheres (AMs) with core-shell bilayer structure, exhibiting distinguishing broadband and tunable high-performance MA. The composite AMs including reduced oxide graphene/Fe3O4 shell layer and chitosan derived carbon core layer (Carbon@RGO/Fe3O4) can be achieved via coaxial electrospinning-freeze frying followed by calcination. The core-shell structure can make electromagnetic wave sequential entry and attenuate, enhancing the impedance matching and electromagnetic wave propagation. Significantly, with a low loading of 5 wt%, the core-shell AMs exhibit a minimum reflection loss of -61 dB at 13.84 GHz with the thickness of 2.5 mm, and the effective absorption bandwidth reach 6.88 GHz. More importantly, the corresponding absorption bandwidth is further widened to 7.52 GHz by adjusting the core-shell ratio. Electromagnetic simulation further indicate the core-shell bilayer coupling including electromagnetic wave sequential attenuation and cavity resonance loss can realize the enhanced broadband MA. The core-shell bilayer structure strategy paves a way to achieve graphene-based aerogel absorbers with high-performance MA.
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