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SiCN ceramics with controllable carbon nanomaterials for electromagnetic absorption performance
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2023-02-22 , DOI: 10.1111/jace.19063 Yuyu Zhang 1 , Jia Sun 1 , Yuqi Wang 1 , Ralf Riedel 2 , Qiangang Fu 1
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2023-02-22 , DOI: 10.1111/jace.19063 Yuyu Zhang 1 , Jia Sun 1 , Yuqi Wang 1 , Ralf Riedel 2 , Qiangang Fu 1
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Different kinds of carbon nanomaterials, free carbon (Cfree), graphene, and N-containing graphene (NG), in single-source-precursors-derived SiCN ceramics, were in situ generated by modifying polysilazane with divinylbenzene, dopamine hydrochloride and melamine, respectively. Adjusting the carbon source brings phase structure and electromagnetic wave absorption (EMA) properties differences of SiCN/C ceramics. In situ Cfree enhances the EMA capacity of SiCN ceramics by improving their electrical conductivity of 9.2 × 10−4 S/cm. The electrical conductivity of SiCN ceramics with 2D graphene sheets balloons to 2.5 × 10−3 S/cm, causing poor impedance match thus leading to a worse EMA performance. In situ NG in SiCN ceramics has a low electrical conductivity of 5.6 × 10−8 S/cm, making for excellent impedance match. The corrugated NG boosts dielectric loss, interfacial, and dipole polarization. NG-SiCN nanocomposites possess an outstanding EMA performance with RLmin of −61.08 dB and effective absorption bandwidth of 4.05 GHz, which are ∼2.4 times lower and ∼4 times higher than those of SiCN, respectively.
中文翻译：
电磁吸收性能可控碳纳米材料SiCN陶瓷
通过用二乙烯基苯、多巴胺盐酸盐和三聚氰胺改性聚硅氮烷，在单源前驱体衍生的 SiCN 陶瓷中原位生成了不同种类的碳纳米材料、游离碳（C free ）、石墨烯和含氮石墨烯（NG ），分别。调整碳源使SiCN/C陶瓷的相结构和电磁波吸收（EMA）性能发生差异。通过提高 9.2 × 10 -4 S/cm的电导率，原位无C提高了 SiCN 陶瓷的 EMA 容量。具有 2D 石墨烯片气球的 SiCN 陶瓷的电导率达到 2.5 × 10 -3 S/cm，导致阻抗匹配不良，从而导致更差的 EMA 性能。SiCN 陶瓷中的原位 NG 具有 5.6 × 10 -8 S/cm的低电导率 ，可实现出色的阻抗匹配。波纹状 NG 会增加介电损耗、界面和偶极极化。NG-SiCN 纳米复合材料具有出色的 EMA 性能，RL min为 -61.08 dB，有效吸收带宽为 4.05 GHz，分别比 SiCN 低约 2.4 倍和高约 4 倍。
更新日期：2023-02-22
中文翻译：
电磁吸收性能可控碳纳米材料SiCN陶瓷
通过用二乙烯基苯、多巴胺盐酸盐和三聚氰胺改性聚硅氮烷，在单源前驱体衍生的 SiCN 陶瓷中原位生成了不同种类的碳纳米材料、游离碳（C free ）、石墨烯和含氮石墨烯（NG ），分别。调整碳源使SiCN/C陶瓷的相结构和电磁波吸收（EMA）性能发生差异。通过提高 9.2 × 10 -4 S/cm的电导率，原位无C提高了 SiCN 陶瓷的 EMA 容量。具有 2D 石墨烯片气球的 SiCN 陶瓷的电导率达到 2.5 × 10 -3 S/cm，导致阻抗匹配不良，从而导致更差的 EMA 性能。SiCN 陶瓷中的原位 NG 具有 5.6 × 10 -8 S/cm的低电导率 ，可实现出色的阻抗匹配。波纹状 NG 会增加介电损耗、界面和偶极极化。NG-SiCN 纳米复合材料具有出色的 EMA 性能，RL min为 -61.08 dB，有效吸收带宽为 4.05 GHz，分别比 SiCN 低约 2.4 倍和高约 4 倍。
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