One-pot hydrothermal synthesis of RGO/CoFe₂O₄ composite and its excellent microwave absorption properties

Reduced graphene oxide (RGO)/CoFe₂O₄ composite was synthesized by a one-pot hydrothermal route, which avoided the usage of chemical reducing agent. The reduction of graphene oxide (GO) and the crystallization of CoFe₂O₄ crystals happened in a one step process by the hydrothermal method. The RGO/CoFe₂O₄ composite shows remarkably improved electromagnetic performance in comparison with CoFe ₂O₄ NPs and reported pure RGO. Not only a larger reflection loss (-47.9 dB at 12.4 GHz), but also a wider absorption band (less than -10 dB from 12.4 to 17.4 GHz) has been achieved in the frequency range of 2-18 GHz. It is believed that such composites could be used as a candidate microwave absorber.