Exceptionally porous three-dimensional architectural nanostructure derived from CNTs/graphene aerogel towards the ultra-wideband EM absorption

Till now, development of a thin thickness (<2.0 mm), wideband absorption, ultralow filling ratio and lightweight electromagnetic (EM) that aims to solve the EM wave pollution is highly desirable but is urgent challenging. Herein, we tackle this issue by developing a novel carbon nanotube/reduced graphene oxide aerogel (CNTs/GA) absorber via a facile in-situ hydrothermal and subsequent freeze-drying route. The fabricated CNTs/GA absorber possessed the porous three-dimensional (3D) network structure, which not only greatly enhances the EM absorption capability but also contributes to the ultralow density and conductive percolation threshold. As a consequence, the absorption layer with 4 wt% of absorber (CNTs/GA aerogel) shows exceptionally EM wave absorption ability with the maximum qualified absorption bandwidth (fE) of 8.5 GHz at a thinner thickness of 1.7 mm. These achievements light the way that producing porous 3D network shaped aerogels constructed with light element can be a good candidate for wideband, ultralight, thin EM absorbers.