Remarkable microwave absorption performance of ultralight graphene-polyethylene glycol composite aerogels with a very low loading ratio of graphene

Abstract Graphene/polyethylene glycol (GPEG) composite aerogels were fabricated by the reduction-assembly of graphene oxide (GO) in polyethylene glycol 400 (PEG400) and the following freeze-drying process. PEG400 can effectively avoid the agglomeration of graphene sheets and adjust the permittivity of GPEGs. These GPEGs show an outstanding improvement on microwave absorption performance when the additive amount of GO is 5–25 wt%. The minimum reflection loss (RL) can reach −43.2 dB at 13.8 GHz, and the effective absorption bandwidth (RL