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Cobalt diselenide (CoSe2) hierarchical clew-like structure is synthesized via a dual-surfactant templated hydrothermal process, and for the first time, its microwave absorption capability has been established. Specifically, the as-synthesized hierarchical interconnected structure is assembled by numerous dense nanobelts. Meticulous tuning of the synthetic conditions which could influence the hierarchical architecture indicates that, in this system, cetyltrimethylammonium bromide (CTAB) plays a dominate role of "balling" while protonated diethylenetriamine (DETA) plays the role of "stringing" . As a novel absorbent, the microwave absorption performance of CoSe2 microstructure is evaluated in 2-18 GHz band. Particularly, 3D hierarchical CoSe2 microclews exhibit superior minimum reflection loss of -26.93 dB at 7.28 GHz and effective absorption bandwidth of 3.72 GHz, which are ~120% and ~104% higher than those of simple CoSe2 nanosheets, respectively. Such drastic enhancement could be attributed to the large specific surface area, and more dissipation channels and scattering sites enabled by the unique clew-like microstructure. The versatile dual-surfactant templated assembly of hierarchical CoSe2 microstructure, along with its appreciable dielectric microwave absorption performance, provides new inspirations in developing novel microwave absorbents for mitigation of electromagnetic pollution.


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Dual-surfactant templated hydrothermal synthesis of CoSe2 hierarchical microclews for dielectric microwave absorption

Show Author's information Qi CAOaJie ZHANGb( )Huibin ZHANGbJunzhou XUaRenchao CHEb( )
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China
Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, China

† Qi Cao and Jie Zhang contributed equally to this work.

Abstract

Cobalt diselenide (CoSe2) hierarchical clew-like structure is synthesized via a dual-surfactant templated hydrothermal process, and for the first time, its microwave absorption capability has been established. Specifically, the as-synthesized hierarchical interconnected structure is assembled by numerous dense nanobelts. Meticulous tuning of the synthetic conditions which could influence the hierarchical architecture indicates that, in this system, cetyltrimethylammonium bromide (CTAB) plays a dominate role of "balling" while protonated diethylenetriamine (DETA) plays the role of "stringing" . As a novel absorbent, the microwave absorption performance of CoSe2 microstructure is evaluated in 2-18 GHz band. Particularly, 3D hierarchical CoSe2 microclews exhibit superior minimum reflection loss of -26.93 dB at 7.28 GHz and effective absorption bandwidth of 3.72 GHz, which are ~120% and ~104% higher than those of simple CoSe2 nanosheets, respectively. Such drastic enhancement could be attributed to the large specific surface area, and more dissipation channels and scattering sites enabled by the unique clew-like microstructure. The versatile dual-surfactant templated assembly of hierarchical CoSe2 microstructure, along with its appreciable dielectric microwave absorption performance, provides new inspirations in developing novel microwave absorbents for mitigation of electromagnetic pollution.

Keywords:

hierarchical structure, cobalt diselenide, surfactant, assembly, microwave absorption
Received: 05 July 2021 Revised: 23 September 2021 Accepted: 04 October 2021 Published: 11 February 2022 Issue date: March 2022
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Publication history

Received: 05 July 2021
Revised: 23 September 2021
Accepted: 04 October 2021
Published: 11 February 2022
Issue date: March 2022

Copyright

© The Author(s) 2021.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 52101213, 51725101, 11727807, 51672050, and 61790581). Qi CAO would like to thank the support from the Department of Science and Technology of Jiangsu Province (No. BK20210261), and "Zhi-Shan" Scholars Programme of Southeast University of China. Renchao CHE acknowledges the support by the Ministry of Science and Technology of China (No. 2018YFA0209102).

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