Two step hydrothermal synthesis of flowerbud-like magnetite/graphene oxide hybrid with high-performance microwave absorption

Resumo

A novel flowerbud-like magnetite/graphene oxide (GO) hybrid was synthesized from facile two-step hydrothermal process by using FeCl₃ as iron source, ethylene glycol as the reducing agent, and graphene oxide as template. The magnetite nanoparticles with the diameters of 70–80 nm were attached onto the surface of graphene oxide through the two-step self-assembly process which enhanced the magnetic properties of the hybrids. The final flowerbud-like magnetite/graphene oxide hybrid emerged with the saturated magnetization of ~84.5 emu g^–1. More importantly, owing to the combined contribution of enhanced dielectric and magnetic properties, the maximum microwave absorption of as-prepared magnetite/GO hybrid reached 30 dB with a thickness of 4 mm. Besides, the absorption bandwidth with a reflection loss above 23 dB ranged from 6.0 to 11.5 GHz.