An effective fabrication and highly tunable microwave absorption of nitrogen-doped graphene

Increasingly serious electromagnetic pollution has been driving the rapid development of microwave absorbing materials. Nitrogen-doped graphene has received abundant attention as a lightweight and efficient microwave absorbing material. This study employs an efficient method to achieve large-scale in situ synthesis of nitrogen-doped graphene. By adjusting the doping level and modifying the morphological structure, the saturation magnetization was significantly enhanced and the impedance matching was improved. Results indicated that when the product was subjected to 13.5 kW, the optimal reflection loss approached −50.0 dB at 6.7 GHz with an absorber thickness of 3.1 mm, and the maximal effective absorption region (Reflection Loss ˂-10 dB) was wider than 3.5 GHz. This one-component absorber could be an excellent candidate for an ultra-lightweight, highly efficient electromagnetic wave absorber.