The problem of electromagnetic pollution is becoming more and more serious with the coming of the 5G era. The development of high-performance electromagnetic absorbing materials is an effective way to solve that problem. In this study, disposable gauze masks are used as raw materials to prepare Ni particles/carbon composites by impregnation process and subsequent calcination for microwave absorption application. Ni particle/carbon composites consist mainly of lamellar carbon and Ni particles. Ni particles in Ni particles/carbon composites are surrounded by graphite phase to form Ni/C core–shell structure. The strong RL of − 42.8 dB at 1.5 mm thick and an effective absorption bandwidth of 3.63 GHz are obtained from Ni particle/carbon composites calcined at 850 °C. This work provides a new idea for the application of disposable gauze masks.

随着5G时代的到来，电磁污染问题变得越来越严重。开发高性能电磁吸波材料是解决这一问题的有效途径。本研究以一次性纱布口罩为原料，通过浸渍工艺制备镍颗粒/碳复合材料，随后进行煅烧用于微波吸收应用。 Ni颗粒/碳复合材料主要由层状碳和Ni颗粒组成。 Ni颗粒/碳复合材料中的Ni颗粒被石墨相包围，形成Ni/C核壳结构。在 850 °C 下煅烧的镍颗粒/碳复合材料获得了 1.5 mm 厚处的强 RL - 42.8 dB 和 3.63 GHz 的有效吸收带宽。该工作为一次性口罩的应用提供了新思路。