Novel SiC‐based nanomaterials, namely the nitrogen and aluminum co‐doped SiC@SiO₂ core‐shell nanowires and nitrogen‐doped SiO₂/Al₂O₃ nanoparticles, have been fabricated through a facile thermal treatment process based on the chemical vapor deposition and vapor‐liquid reaction. These nanomaterials show remarkable hydrophobicity with a water contact angle (CA) over 140°, which are aroused by the surface zigzag morphology of the nanostructures and the hydrocarbyl groups generated during the preparation process. Moreover the nanocomposites also exhibit relatively prominent microwave absorption (MA) properties in the frequency range of 2.0‐18.0 GHz. The minimum reflection loss (RL) value as low as −23.68 dB can be observed at 14.16 GHz when the absorber thickness is 2.6 mm with a loading rate of 16.7 wt%. And the nanocomposites‐based absorbent can achieve an effective absorption bandwidth (RL < −10 dB) of 4.48 GHz with the absorbent thickness of 2.5 mm. This enhanced microwave attenuation performance can be attributed to multiple polarizations and perfect impedance matching conditions, as well as multiple internal reflections. These marvelous properties make these N and Al co‐doped SiC@SiO₂ core‐shell nanowires and N‐doped SiO₂/Al₂O₃ nanoparticles display extensive application potential as MA materials in harsh environment.

中文翻译：

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具有独特的疏水性和微波吸收特性的新型碳化硅纳米材料的制备

新型的基于SiC的纳米材料，即氮和铝共掺杂的SiC @ SiO ₂核壳纳米线和氮掺杂的SiO ₂ / Al ₂ O ₃纳米粒子是通过基于化学气相沉积和汽液相反应的便捷热处理工艺制成的。这些纳米材料具有超过140°的水接触角（CA），具有显着的疏水性，这是由于纳米结构的表面曲折形貌以及制备过程中产生的烃基引起的。此外，纳米复合材料在2.0-18.0 GHz的频率范围内还表现出相对突出的微波吸收（MA）特性。当吸收器厚度为2.6 mm，负载率为16.7 wt％时，在14.16 GHz处可以观察到最低反射损耗（RL）值低至-23.68 dB。纳米复合材料吸收剂的吸收厚度为2.5 mm，可实现4.48 GHz的有效吸收带宽（RL <-10 dB）。这种增强的微波衰减性能可归因于多种极化和完美的阻抗匹配条件，以及多种内部反射。这些出色的性能使这些N和Al共掺杂SiC @ SiO₂条核壳纳米线和N掺杂的SiO ₂ / Al ₂ O ₃纳米颗粒作为MA材料在恶劣环境中具有广阔的应用潜力。