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Nano Research 2022, 15(8): 7723-7730 https://doi.org/10.1007/s12274-022-4494-0
Research Article | Issue | Published: 31 May 2022

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

Show Author's Information 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.

Keywords:
microwave absorption, titanium dioxide, cellulose, carbon aerogel, microsphere
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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
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Abstract Full text Electronic supplementary material About this article

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.


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Electronic supplementary material
About this article

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

Show Author's information 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.

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: microwave absorption, titanium dioxide, cellulose, carbon aerogel, microsphere

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Publication history
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Acknowledgements

Publication history

Received: 06 April 2022
Revised: 29 April 2022
Accepted: 02 May 2022
Published: 31 May 2022
Issue date: August 2022

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

The authors gratefully acknowledge financial support from the National Key Research and Development Program of China (No. 2018YFB0704200), the National Natural Science Foundation of China (Nos. 51973142 and 21878194), and Fundamental Research Funds for the Central Universities (No. YJ2021145).

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