期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 33, 页码 28051-28061出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b07879
关键词
hyperbranched polyborosilazanes; precursor-derived ceramics; SiBCN ceramic; electromagnetic wave absorption
资金
- National Natural Science Foundation of China [21174112]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JC-008]
- Shaanxi Province Key Research and Development Plan for Industry Innovation Chain (Cluster) [2018ZDCXL-GY-09-07]
- Fundamental Research Funds for the Central Universities from NPU [3102017GX06011]
- Analytical & Testing Center of NPU
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 sp(2) 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 degrees 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.
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