Microwave Absorption Properties of Sandwich-Like Graphene-Carbon Black Composite

In this study, a sandwich-like graphene-based composite is successfully fabricated by an electrostatic assembly of carbon black (CB) and reduced graphene oxide (RGO), with a structure of RGO/CB/RGO. Whilst the microstructure and morphology of the 2D Sandwich-like RGO/CB composite were investigated in detail. For 2D Sandwich-like RGO/CB composite, when the doped amount was about 15%, the maximum reflection loss (RLmax) values would reach -35.85 dB at 9.833 GHz with the thickness of 3 mm, and the effective absorption bandwidth (EAB) was 3.5 GHz (8.3-11.8 GHz), almost covered the entire X band. Such excellent microwave absorption (MA) properties can be explained by the capacitor-like structure and the conductive network, which could be used as a hopeful candidate for the new types of microwave absorbing materials.