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In this work, novel carbon nanotube (CNT)/CoSi/SiOC nanocomposite ceramics with in-situ formed multi-walled CNTs and core–shell structured CoSi@C nanoparticles were successfully prepared via a single-source-precursor derived ceramic approach. Ppolymeric precursor characterization as well as phase evolution, microstructure, and electromagnetic wave (EMW) absorption properties of the ceramics were investigated in detail. The results show that the in-situ formed CNTs and magnetic CoSi@C nanoparticles provide a synergistic effect on both dielectric loss (tanδε) and magnetic loss, leading to outstanding EMW absorption properties of the ceramics annealed at only 1100 ℃. (i) For the Co feeding of 6.25 wt%, the minimum reflection loss (RLmin) is −53.1 dB, and the effective absorption bandwidth (EAB) is 4.96 GHz (7.12–12.08 GHz) with a ceramic–paraffin hybrid sample thickness of 3.10 mm, achieving full X-band coverage; (ii) for the Co feeding of 9.09 wt%, the RLmin value of −66.4 dB and the EAB value of 3.04 GHz (8.40–11.44 GHz) were achieved with a thickness of only 2.27 mm. Therefore, the present CNT/CoSi/SiOC nanocomposite ceramics have potential applications for thin, lightweight, and efficient EMW absorption in harsh environments.


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Single-source-precursor derived SiOC ceramics with in-situ formed CNTs and core–shell structured CoSi@C nanoparticles towards excellent electromagnetic wave absorption properties

Show Author's information Zhaoju Yua,b,c( )Ting ChenaHanzi DuaFen LiaQikun Zhua
College of Materials, Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen 361005, China
College of Materials, Xiamen Key Laboratory of Electronic Ceramic Materials and Devices, Xiamen University, Xiamen 361005, China
College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen 361005, China

Abstract

In this work, novel carbon nanotube (CNT)/CoSi/SiOC nanocomposite ceramics with in-situ formed multi-walled CNTs and core–shell structured CoSi@C nanoparticles were successfully prepared via a single-source-precursor derived ceramic approach. Ppolymeric precursor characterization as well as phase evolution, microstructure, and electromagnetic wave (EMW) absorption properties of the ceramics were investigated in detail. The results show that the in-situ formed CNTs and magnetic CoSi@C nanoparticles provide a synergistic effect on both dielectric loss (tanδε) and magnetic loss, leading to outstanding EMW absorption properties of the ceramics annealed at only 1100 ℃. (i) For the Co feeding of 6.25 wt%, the minimum reflection loss (RLmin) is −53.1 dB, and the effective absorption bandwidth (EAB) is 4.96 GHz (7.12–12.08 GHz) with a ceramic–paraffin hybrid sample thickness of 3.10 mm, achieving full X-band coverage; (ii) for the Co feeding of 9.09 wt%, the RLmin value of −66.4 dB and the EAB value of 3.04 GHz (8.40–11.44 GHz) were achieved with a thickness of only 2.27 mm. Therefore, the present CNT/CoSi/SiOC nanocomposite ceramics have potential applications for thin, lightweight, and efficient EMW absorption in harsh environments.

Keywords: polymer-derived ceramics (PDCs), electromagnetic properties, core–shell structure, in-situ formed carbon nanotubes (CNTs), electromagnetic wave (EMW) absorption properties

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Publication history

Received: 17 November 2022
Revised: 19 February 2023
Accepted: 10 March 2023
Published: 06 May 2023
Issue date: June 2023

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© The Author(s) 2023.

Acknowledgements

Zhaoju Yu thanks the National Natural Science Foundation of China (Nos. 51872246 and 52061135102) for financial support.

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