Application of N-doped NiCo2O4 / NiO / Co3O4 composites rich in oxygen vacancies in electromagnetic wave absorption.

In this work, N-doped and oxygen vacancy-rich NiCo2O4/NiO/Co3O4 composites are synthesized by the direct calcination method. Noticeably, by changing the additive concentrations of urea dissolved in DMF (N-N dimethylformamide), the electromagnetic (EM) wave absorption abilities of NiCo2O4/NiO/Co3O4 composite effectively. A maximum reflection loss (RLmax) value at 12.94 GHz for a 2.8 mm thick sheet is -29.76 dB, while its effective absorption bandwidth (EAB) (RL<-10 dB) reaches 4.21 GHz. In-depth research of possible mechanisms of EM wave absorption enhancement. Owing to its simple preparation method and superb EM wave absorption properties, the NiCo2O4/NiO/Co3O4 composites have a chance to be suitable candidates for high-property EM wave absorbers.