Improving microwave adsorption property of ZnO particle by doping graphene

ZnO/graphene nanocomposite has been prepared by aqueous-solution and calcinations route. The electromagnetic (EM) characteristics of ZnO/graphene nanocomposite were studied by Agilent E8362B PNA vector network analyzer at 2–18   GHz. The reflection loss (RL) of ZnO/graphene nanocomposite was calculated from the EM characteristics. A RL exceeding −10   dB was obtained in the frequency range of 3.2–17   GHz with an absorber thickness of 1.5–5   mm. An optimal RL of −52   dB was found at 5.2   GHz with an absorber thickness of 3.5   mm. The excellent microwave absorption properties were a consequence of proper EM match in the microstructure as well as multi-interface polarization mechanisms.