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Materials 2019, 12(2), 213; https://doi.org/10.3390/ma12020213

Ultra-Light Reduced Graphene Oxide Based Aerogel/Foam Absorber of Microwave Radiation

1
Institute for Nuclear Problems of Belarusian State University, Bobruiskaya 11, 220030 Minsk, Belarus
2
Guizhou Building Material Quality Supervision Testing Center, Guiyang 550000, China
3
State Key Laboratory of Polymer Materials and Engineering, Sichuan University, Chengdu 610065, China
4
Institute of Polymer, Composites and Biomedical Materials, IPCB-CNR, Naples 80125, Italy
5
Radio Engineering Department, Tomsk State University, 36 Lenin Prospekt, 634050 Tomsk, Russian
These authors contributed equally to the paper.
*
Author to whom correspondence should be addressed.
Received: 29 November 2018 / Revised: 4 January 2019 / Accepted: 7 January 2019 / Published: 10 January 2019
(This article belongs to the Special Issue Carbon Based Functional Microwave Shields)
Full-Text   |   PDF [4537 KB, uploaded 10 January 2019]   |  

Abstract

We present the polarization-dependent highly absorptive in Ka-band composition of conventional polyurethane foam filled with in situ synthesized aerogel coated by reduced graphene oxide (rGO). The rGO-based aerogel was in situ prepared into the open-cell polyurethane foam (PUF) skeleton through a bidirectional freeze-drying process. The aerogel is composed of the flat lamellas stacks, possessing the anisotropic structure and unique electromagnetic properties. Further improvement of the electromagnetic shielding ability was possible by the rGO coating introduction as a coupling layer between PUF and rGO-based aerogel. This enhances the overall conductivity of the resulting composites: 1.41 + 3.33i S/m vs. 0.9 + 2.45i S/m for PUF loaded with in situ synthesized aerogel without rGO coating.With this mechanically robust plane easy to process coating one could achieve −20 dB by power with the record light structure (0.0462 g/cm2). That could compete in view of the weight per cm2 even with graphene-based absorbers comprising either dielectric matching elements or back metal reflectors, or both. View Full-Text
Keywords: reduced graphene oxide; polyurethane foam; aerogel; microwave; absorption; electromagnetic interference shielding; compressive deformation reduced graphene oxide; polyurethane foam; aerogel; microwave; absorption; electromagnetic interference shielding; compressive deformation
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Plyushch, A.; Zhai, T.; Xia, H.; Santillo, C.; Verdolotti, L.; Lavorgna, M.; Kuzhir, P. Ultra-Light Reduced Graphene Oxide Based Aerogel/Foam Absorber of Microwave Radiation. Materials 2019, 12, 213.

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