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A novel type of three-dimensional ultralight aerogel sphere, consisting of one-dimensional nanocellulose-derived carbon fibers and two-dimensional graphene layers, was prepared based on a developed drop-freeze-drying followed by carbonization approach. The nanofibrous carbon efficiently prevents the agglomeration of the graphene layers, which, in turn, reduces the shrinkage and maintains the structural stability of the hybrid carbon aerogel spheres. Consequently, the aerogel spheres showing an ultralow-density of 2.8 mg/cm3 and a porosity of 99.98% accomplish the tunable dielectric property and electromagnetic wave (EMW) absorption performance. The high-efficiency utilization of biomass-derived fibrous nanocarbon, graphene, and the porous structure of the hybrid aerogel spheres leads to the excellent EMW absorption performance. The aerogel spheres display an effective absorption bandwidth of 6.16 GHz and a minimum reflection loss of −70.44 dB even at a filler loading of merely 3 wt.%, significantly outperforming that of other biomass-derived carbon-based EMW absorbing materials. This work offers a feasible, facile, and scalable approach for fabricating high-performance and sustainable biomass-based aerogels, suggesting a tremendous application potential in EMW absorption and aerospace.


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Ultralight aerogel sphere composed of nanocellulose-derived carbon nanofiber and graphene for excellent electromagnetic wave absorption

Show Author's information Runa Zhang1Bin Li1Yunfei Yang1Na Wu2( )Zhuyin Sui3Qingfu Ban3Lili Wu1Wei Liu4,5Jiurong Liu1( )Zhihui Zeng1,6( )
Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, China
Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich CH-8093, Switzerland
School of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100, China
Shenzhen Research Institute of Shandong University, Shenzhen 518063, China
Suzhou Research Institute of Shandong University, Suzhou 215123, China

Abstract

A novel type of three-dimensional ultralight aerogel sphere, consisting of one-dimensional nanocellulose-derived carbon fibers and two-dimensional graphene layers, was prepared based on a developed drop-freeze-drying followed by carbonization approach. The nanofibrous carbon efficiently prevents the agglomeration of the graphene layers, which, in turn, reduces the shrinkage and maintains the structural stability of the hybrid carbon aerogel spheres. Consequently, the aerogel spheres showing an ultralow-density of 2.8 mg/cm3 and a porosity of 99.98% accomplish the tunable dielectric property and electromagnetic wave (EMW) absorption performance. The high-efficiency utilization of biomass-derived fibrous nanocarbon, graphene, and the porous structure of the hybrid aerogel spheres leads to the excellent EMW absorption performance. The aerogel spheres display an effective absorption bandwidth of 6.16 GHz and a minimum reflection loss of −70.44 dB even at a filler loading of merely 3 wt.%, significantly outperforming that of other biomass-derived carbon-based EMW absorbing materials. This work offers a feasible, facile, and scalable approach for fabricating high-performance and sustainable biomass-based aerogels, suggesting a tremendous application potential in EMW absorption and aerospace.

Keywords: composite, graphene, aerogel, electromagnetic wave absorption, nanocellulose

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Publication history
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Acknowledgements

Publication history

Received: 08 December 2022
Revised: 05 January 2023
Accepted: 19 January 2023
Published: 10 March 2023
Issue date: May 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This work was supported by the National Key R&D Program of China (No. 2021YFB3502500), the Natural Science Foundation of Shandong Province (Nos. 2022HYYQ-014 and ZR2016BM16), the New 20 Funded Programs for universities of Jinan (No. 2021GXRC036), the Provincial Key Research and Development Program of Shandong (Nos. 2019JZZY010312 and 2021ZLGX01), the National Natural Science Foundation of China (No. 22205131), the Natural Science Foundation of Jiangsu Province (No. BK20220274), the Shenzhen Municipal Special Fund for Guiding Local Scientific and Technological Development (No. 2021Szvup071), the Joint Laboratory project of Electromagnetic Structure Technology (No. 637-2022-70-F-037), and the Qilu Young Scholar Program of Shandong University (No. 31370082163127).

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