Abstract Flexible microwave absorbers with high stability are in increasing demand for the applications under harsh conditions. SiC as a functional ceramic material has the feature of high environmental tolerance and adjustable electromagnetic (EM) absorbing properties, making them suitable to be applied for harsh environments. However, the electrical property of SiC requires to be further enhanced to obtain qualified EM absorbing performance. In this work, multiwall carbon nanotubes (CNTs) were introduced to SiC to enhance the electrical properties. Flexible 2-dimensional (2D) CNTs loaded SiC fiber mats were prepared as EM absorbers via electrospinning and polymer-derived-ceramic (PDC) methods. The CNTs inside the fibers can form conductive networks and act as reinforcement to ensure high flexibility and enhance the microwave absorption properties of SiC mats. Thus, a reflection loss of -61 dB and an effective absorption band (EAB) of 2.9 GHz were obtained. More importantly, the EM absorption can be adjusted by tuning the content of CNTs and the EAB can cover the entire X-band by adjusting the material thickness. The work provided a facile strategy to fabricated flexible 2D ceramic mats with high environmental stability and tunable electrical properties, which may shed light on the production of reliable EM absorber for broadband EM absorption applications.

中文翻译：

---

用于可调谐和宽带微波吸收的柔性 SiC-CNTs 混合纤维垫

摘要 具有高稳定性的柔性吸波材料在恶劣条件下的应用需求日益增加。碳化硅作为一种功能陶瓷材料，具有高环境耐受性和可调节的电磁（EM）吸收特性，使其适用于恶劣的环境。然而，需要进一步提高碳化硅的电学性能以获得合格的电磁吸收性能。在这项工作中，将多壁碳纳米管 (CNT) 引入 SiC 以提高电性能。通过静电纺丝和聚合物衍生陶瓷 (PDC) 方法制备了载有 SiC 纤维垫的柔性二维 (2D) 碳纳米管作为 EM 吸收剂。纤维内部的碳纳米管可以形成导电网络并起到增强作用，以确保高柔韧性并增强 SiC 垫的微波吸收性能。因此，获得了 -61 dB 的反射损耗和 2.9 GHz 的有效吸收带 (EAB)。更重要的是，可以通过调整 CNT 的含量来调整 EM 吸收，而 EAB 可以通过调整材料厚度来覆盖整个 X 波段。该工作为制造具有高环境稳定性和可调电性能的柔性二维陶瓷垫提供了一种简便的策略，这可能有助于为宽带电磁吸收应用生产可靠的电磁吸收器。EM 吸收可以通过调整 CNT 的含量来调整，EAB 可以通过调整材料厚度来覆盖整个 X 波段。该工作为制造具有高环境稳定性和可调电性能的柔性二维陶瓷垫提供了一种简便的策略，这可能有助于为宽带电磁吸收应用生产可靠的电磁吸收器。EM 吸收可以通过调整 CNT 的含量来调整，EAB 可以通过调整材料厚度来覆盖整个 X 波段。该工作为制造具有高环境稳定性和可调电性能的柔性二维陶瓷垫提供了一种简便的策略，这可能有助于为宽带电磁吸收应用生产可靠的电磁吸收器。