For the first time, the lightweight, flexible SiCN nanowires with highly efficient electromagnetic wave absorbing performance were prepared by electrospinning with subsequent high temperature annealing in nitrogen atmosphere. The nanowires are composed of cubic-SiC, free carbon, and silicon nitride nanocrystals. By means of controlling annealing time, the microstructure and chemical composition of as-prepared nanowires can be well regulated. The nanowires exhibit excellent flexibility with no fracture whatever conditions they are under for instance bending, twisting, folding, or twining. Carbon backbone was inserted into ceramic matrix to toughen the nanowire. The dielectric properties and electromagnetic (EM) wave absorption performance of nanowires were investigated between 2 and 18 gigahertz (GHz). The nanowires display great EM absorbing behaviour with an optimal reflection loss (RL) of −53.1 dB and the effective absorption bandwidth (EAB, RL below −10 dB) covers whole Ku band (12.4–18.0 GHz) at a small thickness of 1.95 mm. The distinctive microstructure of the nanowires give rise to their outstanding mechanical and EM performance that endow the nanowires potential to be utilized as lightweight, ultrastrong radar wave absorbers in harsh environments.

首次通过电纺丝并随后在氮气氛中进行高温退火，制备了具有高效电磁波吸收性能的轻质，柔性SiCN纳米线。纳米线由立方SiC，自由碳和氮化硅纳米晶体组成。通过控制退火时间，可以很好地调节所制备的纳米线的微观结构和化学组成。纳米线无论在什么条件下（例如弯曲，扭曲，折叠或缠绕），都具有出色的柔韧性，不会断裂。将碳骨架插入陶瓷基体中以加固纳米线。研究了纳米线的介电性能和电磁波（EM）吸收性能，频率范围为2至18 GHz。纳米线表现出出色的EM吸收性能，最佳反射损耗（RL）为-53.1 dB，有效吸收带宽（EAB，RL低于−10 dB）覆盖了整个Ku波段（12.4–18.0 GHz），厚度仅为1.95 mm 。纳米线的独特微观结构使其具有出色的机械性能和电磁性能，这赋予了纳米线在恶劣环境下用作轻巧，超强雷达波吸收体的潜力。