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Research Article

Carbon aerogel microspheres with in-situ mineralized TiO2 for efficient microwave absorption

Yue-Yi Wang1,§, Jin-Long Zhu2,§, Nan Li1, Jun-Feng Shi1, Jian-Hua Tang3, Ding-Xiang Yan1( ), Zhong-Ming Li2( )
School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
College of Chemical Engineering, Sichuan University, Chengdu 610065, China

§ Yue-Yi Wang and Jin-Long Zhu contributed equally to this work.

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Graphical Abstract

Cellulose derived carbon aerogel microspheres achieve the balance between attenuation characteristics and impedance matching performance in application of microwave absorption by in-situ mineralizing TiO2.

Abstract

Carbon aerogels (CAs) have been considered potential microwave absorption (MA) materials because of intrinsic hierarchical porous structure, low density, and excellent heat resistance. However, CAs always required to be ground into micron-scale powder before being used as microwave absorbers, which will inevitably destroy the hierarchical porous structure. Meanwhile, reproducing the optimized CAs powders is difficult. Herein, CAs microspheres with in-situ mineralized TiO2 were easily prepared via a sol–gel transition and calcination process. The uniform size of CA microspheres and the loaded TiO2 on the skeleton of CA yield great microwave attenuation performance while guaranteeing good impedance matching performance. The obtained TiO2/CA hybrid presented a minimum reflection loss value of −30.2 dB and a broad effective absorption bandwidth (reflection loss below −10 dB) of 6.2 GHz. The low density, MA performance, and controllable particle size make the novel TiO2/CA hybrid promising candidates for MA applications.

Keywords

carbon aerogelmicrospherecellulosetitanium dioxidemicrowave absorption

Electronic Supplementary Material

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Nano Research
Volume 15 Issue 8,
August 2022
Pages 7723-7730
DOI: 10.1007/s12274-022-4494-0
Cite this article:
Wang Y-Y, Zhu J-L, Li N, et al. Carbon aerogel microspheres with in-situ mineralized TiO2 for efficient microwave absorption. Nano Research, 2022, 15(8): 7723-7730. https://doi.org/10.1007/s12274-022-4494-0
Topics:
Aerosols
Part of a topical collection:
EM Wave Functional Materials

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Received: 06 April 2022
Revised: 29 April 2022
Accepted: 02 May 2022
Published: 31 May 2022
© Tsinghua University Press 2022
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