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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

JOURNAL OF ADVANCED CERAMICS(2023)

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摘要
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 (tande) and magnetic loss, leading to outstanding EMW absorption properties of the ceramics annealed at only 1100 degrees C (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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关键词
polymer-derived ceramics (PDCs),in-situ formed carbon nanotubes (CNTs),core-shell structure,electromagnetic properties,electromagnetic wave (EMW) absorption properties
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