Nitrogen-Doping-Regulated Electromagnetic Wave Absorption Properties of Ultralight Three-Dimensional Porous Reduced Graphene Oxide Aerogels

Heteroatom nitrogen doping is considered an effective strategy to enhance the electromagnetic wave (EMW) absorption capacity of reduced graphene oxide (RGO). Herein, nitrogen-doped RGO aerogels (NGAs) are synthesized via hydrothermal self-assembly followed by lyophilization processes. Results of micromorphology analysis show that the as-prepared NGAs display unique 3D porous and netlike structure. Moreover, the effects of nitrogen doping and filler contents on EMW absorption properties of NGAs are studied. The as-synthesized NGA with nitrogen content of 9.41 at% and a bulk density of 8.7 mg cm(-3) presents the integrated optimal EMW absorption performance. Specifically, the minimum reflection loss of -56.4 dB is achieved and maximum absorption bandwidth of 6.8 GHz is reached, covering the whole Ku band. In addition, the possible EMW absorption mechanisms of obtained NGAs are proposed. Therefore, the as-synthesized NGAs can be exploited as promising high-efficiency and lightweight EMW absorbers.