High-Temperature Stable and Metal-Free Electromagnetic Wave-Absorbing SiBCN Ceramics Derived from Carbon-Rich Hyperbranched Polyborosilazanes

ACS Applied Materials & Interfaces
Chunjia LuoJie Kong

Abstract

High-temperature stable and metal-free siliconboron carbonitride ceramics with high electromagnetic (EM) wave-absorbing efficiency were achieved through the structural design and pyrolysis of carbon-rich hyperbranched polyborosilazane precursors with pendent phenyl groups. The introduction of benzene rings into the precursors dramatically changes the microstructure and the EM wave-absorbing property of ceramics. It reveals that the ceramics pyrolyzed from the benzene ring-containing preceramic precursors have a higher carbon content and a larger number of sp2 carbons and generate crystalline carbons (graphitic carbons and tubular carbons) in situ, which lead to excellent EM wave-absorbing properties. The EM wave absorption efficiency and effective absorption bandwidth (EAB, reflection coefficient (RC) below -10 dB) can be tuned via annealing of the ceramics. The ceramics stable at 1320 °C exhibit their optimized EM wave-absorbing performance with a minimum RC (RCmin) of -71.80 dB and an EAB of 3.65 GHz (8.2-11.85 GHz). We believe that the research extends the design strategy of advanced EM wave-absorbing functional materials, which have great potential as promising absorbers in commercial or military applications.

References

Oct 13, 2009·Journal of the American Chemical Society·Xiaolin LiHongjie Dai
Mar 17, 2015·ACS Applied Materials & Interfaces·Jie KongLinan An
Apr 17, 2015·ACS Applied Materials & Interfaces·Hualiang LvYouwei Du
Feb 27, 2016·ACS Applied Materials & Interfaces·Hualiang LvZhichuan J Xu
Mar 11, 2016·Nature·Aanindeeta BanerjeeMatthew W Kanan

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Citations

Mar 6, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Karol Kułacz, Kazimierz Orzechowski
Mar 15, 2019·Nano-micro Letters·Huanqin ZhaoZhichuan J Xu
Jul 21, 2021·ACS Applied Materials & Interfaces·Qingqing ChenRalf Riedel
Nov 12, 2021·ACS Applied Materials & Interfaces·Chengen WangBoquan Zhu

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