Construction of core-shell structured ZnO/C@PPy composite as high-performance dielectric electromagnetic wave absorber

Dielectric composite shows potential in the field of electromagnetic wave (EMW) absorption. Hence, we designed and synthesized ZnO/[email protected], by calcining ZIF-8 and coating polypyrrole. It was studied emphatically the effects of calcination temperature and the amount of pyrrole coating on the EMW absorption capacity and permittivity of ZnO/[email protected] With the increase of temperature and amount of pyrrole and its permittivity enhance significantly. [email protected] (ZIF-8 was calcined at 700 0C and pyrrole amount was 0.4 mL/0.1 g ZnO/C) shows the optimal performace with minimum reflection loss (RLmin) of −76.31 dB at 14.85 GHz and the effective absorption bandwidth (RL < -10 dB) of 6.38 GHz, covering the whole Ku-band. We believe this study can provide a new idea for dielectric EMW absorber.