Development of Novel Graphene/g-C3N4 Composite with Broad-Frequency and Light-Weight Features

In this study, a novel graphene/g-C 3 N 4 microwave absorber is developed to solve the electromagnetic wave interference problem. Graphene/g-C 3 N 4 composite is synthesized by loading g-C 3 N 4 nanosheets on graphene through a simple liquid-phase approach. High-performance electromagnetic absorption performance can be achieved. The optimal reflection loss value is up to −29.6 dB under a thin coating layer of 1.5 mm. At the same time, the corresponding absorption bandwidth of this composite can reach 5.2 GHz (12.8–18 GHz). Excellent electromagnetic absorption property may be attributed to the current attenuation theory which has been proven by replacing graphene with porous graphene or graphene oxide. The results reveal that free electron numbers and loading mass of g-C 3 N 4 on graphene play the key roles in the intensity of current attenuation and resistance value.