Microwave absorbing property optimization of starlike ZnO/reduced graphene oxide doped by ZnO nanocrystal composites

and KOH. The dielectric and microwave absorption properties of the composites show dependence on the mass ratio of RGO to ZnO. The sample with the mass ratio of 8 : 1 shows the most prominent microwave absorption properties, with strong absorption (minimum reflection loss of -77.5 dB) and broad effective absorption bandwidth (6.9 GHz). The enhanced microwave absorption properties can be ascribed to the starlike ZnO, which hinder the agglomeration of RGO, as well as the ZnO nanocrystals, effectively improving the interface of the heterostructure and the impedance matching of RGO.