Facile synthesis of RGO/NiO composites and their excellent electromagnetic wave absorption properties

Reduced graphene oxide/NiO composite (RGO/NiO) was synthesized by a facile pyrolyzation process. The NiO nanoparticles with a small size of about 10–50   nm are uniformly dispersed onto the thin graphene nanosheets . The as-prepared RGO/NiO composite shows excellent microwave absorbability. The obtained composite with a coating layer thickness of 3.5   mm exhibits a maximum absorption of −55.5   dB at 10.6   GHz. And in particular, the product with a coating layer thickness of only 3.0   mm possesses a bandwidth of 6.7   GHz (from frequency of 10.2 to 16.9   GHz) corresponding to reflection loss at −10   dB (90% absorption). Thus, the as-prepared RGO/NiO composite is a very promising EM wave absorbing material as lightweight and high-performance.