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

• RGO/CoFe2O4 composite was synthesized by a one-pot hydrothermal route.
• This method avoids the usage of reducing agent.
• GO was reduced well by hydrothermal method.
• The composite shows a large RL (−47.9 dB) and a wide absorption band (5.0 GHz).

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 CoFe2O4 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.

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