The silicon coated Carbon nanotubes (CNTs) nanocomposite (CNTs@Si) with a shell structure was successfully synthesized by a simple chemical vapor deposition (CVD) method. In this work, the CNTs@Si is not only introduced as a structural material providing oxidation performance, but also as an extremely effective electromagnetic wave (EMW) absorption nanocomposite. Dielectric characteristics EMW absorption properties within the frequency range of 2–18 GHz of CNTs@Si were studied, and the oxidation resistance of CNTs@Si was characterized. Due to the dense space conductive network formed by CNTs, the EMW absorbing properties of CNTs@Si nanocomposite features excellent electromagnetic wave absorption capacity at a filling amount of 1%. The maximum reflection loss (RL) reaches −61.57 dB at the thickness of 1.8 mm, and a wide effective absorption bandwidth (EAB, RL < −10 dB) of 2.88 GHz is achieved. The obtained CNTs@Si core-shell nanocomposites exhibit excellent antioxidant performance and absorbing performance due to silicon bridging. Efficient electromagnetic wave absorption and excellent oxidation resistance of CNTs@Si can be regarded as a brand-new competitive candidate for EMW absorption materials in harsh environment.

通过简单的化学气相沉积（CVD）方法成功合成了具有壳结构的硅包覆碳纳米管（CNTs）纳米复合材料（CNTs@Si）。在这项工作中，CNTs@Si 不仅作为一种提供氧化性能的结构材料，而且作为一种极其有效的电磁波 (EMW) 吸收纳米复合材料被引入。介电特性 研究了 CNTs@Si 在 2-18 GHz 频率范围内的 EMW 吸收特性，并表征了 CNTs@Si 的抗氧化性。由于CNTs形成致密的空间导电网络，CNTs@Si纳米复合材料的EMW吸收性能在1%的填充量下具有优异的电磁波吸收能力。最大反射损耗 (RL) 在 1.8 mm 厚度处达到 -61.57 dB，并且实现了 2.88 GHz 的宽有效吸收带宽 (EAB, RL < -10 dB)。由于硅桥接，所获得的CNTs@Si核壳纳米复合材料表现出优异的抗氧化性能和吸收性能。CNTs@Si 的高效电磁波吸收和优异的抗氧化性可被视为恶劣环境下 EMW 吸收材料的全新竞争候选者。