Construction of Core-shell Structured ZnO/C@PPy Composite as High-performance Dielectric Electromagnetic Wave Absorber

Abstract Dielectric composite shows potential in the field of electromagnetic wave (EMW) absorption. Hence, we designed and synthesized ZnO/C@PPy, 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/C@PPy. With the increase of temperature and amount of pyrrole and its permittivity enhance significantly. Z700@P4 (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