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

Abstract

AbstractHeteroatom 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.