Developing ultrabroad radar-infrared compatible stealth materials has turned into a research hotspot, which is still a problem to be solved. Herein, the copper sulfide wrapped by reduced graphene oxide to obtain three-dimensional (3D) porous network composite aerogels (CuS@rGO) were synthesized via thermal reduction ways (hydrothermal, ascorbic acid reduction) and freeze-drying strategy. It was discovered that the phase components (rGO and CuS phases) and micro/nano structure (microporous and nanosheet) were well-modified by modulating the additive amounts of CuS and changing the reduction ways, which resulted in the variation of the pore structure, defects, complex permittivity, microwave absorption, radar cross section (RCS) reduction value and infrared (IR) emissivity. Notably, the obtained CuS@rGO aerogels with a single dielectric loss type can achieve an ultrabroad bandwidth of 8.44 GHz at 2.8 mm with the low filler content of 6 wt% by a hydrothermal method. Besides, the composite aerogel via the ascorbic acid reduction realizes the minimum reflection loss (RL_min) of − 60.3 dB with the lower filler content of 2 wt%. The RCS reduction value can reach 53.3 dB m², which effectively reduces the probability of the target being detected by the radar detector. Furthermore, the laminated porous architecture and multicomponent endowed composite aerogels with thermal insulation and IR stealth versatility. Thus, this work offers a facile method to design and develop porous rGO-based composite aerogel absorbers with radar-IR compatible stealth.

开发超宽频雷达-红外兼容隐身材料已成为研究热点，但仍是亟待解决的问题。在此，通过热还原方式（水热、抗坏血酸还原）和冷冻干燥策略合成了被还原氧化石墨烯包裹的硫化铜以获得三维（3D）多孔网络复合气凝胶（CuS@rGO）。发现通过调节CuS的添加量和改变还原方式，可以很好地修饰相组分（rGO和CuS相）和微/纳米结构（微孔和纳米片），从而导致孔结构的变化，缺陷、复介电常数、微波吸收、雷达截面 (RCS) 衰减值和红外 (IR) 发射率。尤其，通过水热法，获得的具有单一介电损耗类型的 CuS@rGO 气凝胶可以在 2.8 mm 处实现 8.44 GHz 的超宽带宽，填料含量低至 6 wt%。此外，通过抗坏血酸还原的复合气凝胶实现了最小的反射损失（RL_min ) 为 − 60.3 dB，较低的填料含量为 2 wt%。RCS衰减值可达53.3 dB m ²，有效降低目标被雷达探测器探测到的概率。此外，层压多孔结构和多组分赋予复合气凝胶隔热和红外隐身多功能性。因此，这项工作提供了一种简便的方法来设计和开发具有雷达红外兼容隐身功能的基于多孔 rGO 的复合气凝胶吸收器。