Abstract

Absorption in excess of 90% is induced over a 22 GHz bandwidth by the combination of carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) dispersed in a polymer matrix. This performance is achieved by a stack of polymer films showing a concentration gradient of mixed CNTs and GNPs from layer to layer, having a total thickness of only $$0.76\,\lambda /4.$$ Excellent agreement is observed from 18 to 40 GHz between the predicted and measured reflectivity and the resulting high absorption.

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