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Rapid Communication | Open Access

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

Qi CAOa,†, Jie ZHANGb,†( ), Huibin ZHANGb, Junzhou XUa, Renchao 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.

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Graphical Abstract

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 structurecobalt diselenidesurfactantassemblymicrowave absorption

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Journal of Advanced Ceramics
Volume 11 Issue 3,
March 2022
Pages 504-514
DOI: 10.1007/s40145-021-0545-3
Cite this article:
CAO Q, ZHANG J, ZHANG H, et al. Dual-surfactant templated hydrothermal synthesis of CoSe2 hierarchical microclews for dielectric microwave absorption. Journal of Advanced Ceramics, 2022, 11(3): 504-514. https://doi.org/10.1007/s40145-021-0545-3

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Received: 05 July 2021
Revised: 23 September 2021
Accepted: 04 October 2021
Published: 11 February 2022
© The Author(s) 2021.

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