Pitch carbon coating graphene/carbon nanotubes lightweight composite and their excellent microwave absorption capacity

We have fabricated a novel carbon coating RGO/CNTs lightweight composites using coal tar pitch and frozen petroleum pitch as the carbon resources, respectively. This is done through a high-energy ball milling method and a liquid phase method, respectively. The microwave absorbing properties reveal that the carbon coating RGO/CNTs composite synthesized by liquid phase using coal tar pitch as carbon resource show the maximum absorption of −18.9 dB at 11.7 GHz with a thickness of 2 mm. In addition, the bandwidth corresponding to reflection loss at −10 dB can reach 14.8 GHz (from 3.2 to 18 GHz) with the thickness in the range of 2–7 mm. It is believed that such composite will find its wide applications in microwave absorbing area.