Publikation:

Lightweight magnetic carbon nanotube/cellulose nanofibre aerogels with microstructure engineering for enhanced microwave absorption

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Datum

2025

Autor:innen

Zhang, Bin
Qu, Zhengyao
Yang, Lu
Chi, Baihong
Kong, Ya
Wang, Fazhou

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https://doi.org/10.1016/j.carbon.2025.120020
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Angaben zur Forschungsförderung

National Natural Science Foundation of China: 52130208

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Open Access-Veröffentlichung

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Chemie: Publikationen
Core Facility der Universität Konstanz

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Carbon. Elsevier. 2025, 234, 120020. ISSN 0008-6223. eISSN 1873-3891. Verfügbar unter: doi: 10.1016/j.carbon.2025.120020

Zusammenfassung

Microscopic structural control offers a promising solution to the performance bottlenecks faced by most commercial microwave absorbers, often limited by their intrinsic electromagnetic properties. In this study, we have developed lightweight unidirectional aerogels with tunable electromagnetic properties using unidirectional freezing and freeze-drying techniques without high temperature calcination. Cellulose nanofibre (CNF) forms the structural framework, while multi-walled carbon nanotube (MWCNT) enhances electrical conductivity and mechanical stability. The incorporation of Fe3O4 nanoparticles further prevents the aerogels from collapsing under ambient conditions. By adjusting the MWCNT to Fe3O4 ratio, tunable microwave absorption across the entire frequency band is achieved, with optimal absorption intensity of −45.0 dB and an effective absorption bandwidth (EAB) of 6.1 GHz. The unique micron-level unidirectional pore structures also modulate the complex permittivity in response to different electromagnetic wave (EMW) incident directions, paving a feasible method for regulating microstructures with electromagnetic response characteristics. Radar cross section (RCS) and electromagnetic response simulations confirm the aerogels’ excellent EMW absorbing properties and sensitivity to incident direction, illustrating that microstructure regulation offers new insights for designing lightweight and high-performance EMW absorbing materials.

Zusammenfassung in einer weiteren Sprache

Fachgebiet (DDC)
540 Chemie

Schlagwörter

Magnetic carbon nanotube aerogels, Unidirectional freeze casting, Unidirectional porous structure, Microwave absorption, Electromagnetic simulation

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ISO 690ZHANG, Bin, Zhengyao QU, Cristina RUIZ AGUDO, Lu YANG, Baihong CHI, Ya KONG, Fazhou WANG, 2025. Lightweight magnetic carbon nanotube/cellulose nanofibre aerogels with microstructure engineering for enhanced microwave absorption. In: Carbon. Elsevier. 2025, 234, 120020. ISSN 0008-6223. eISSN 1873-3891. Verfügbar unter: doi: 10.1016/j.carbon.2025.120020
BibTex
@article{Zhang2025-03Light-72354,
  title={Lightweight magnetic carbon nanotube/cellulose nanofibre aerogels with microstructure engineering for enhanced microwave absorption},
  year={2025},
  doi={10.1016/j.carbon.2025.120020},
  volume={234},
  issn={0008-6223},
  journal={Carbon},
  author={Zhang, Bin and Qu, Zhengyao and Ruiz Agudo, Cristina and Yang, Lu and Chi, Baihong and Kong, Ya and Wang, Fazhou},
  note={Article Number: 120020}
}
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