Application of N-doped NiCo 2 O 4 /NiO/Co 3 O 4 composites rich in oxygen vacancies in electromagnetic wave absorption.

In this work, N-doped and oxygen vacancy-rich NiCo 2 O 4 /NiO/Co 3 O 4 composites are synthesized by the direct calcination method. Noticeably, by changing the additive concentrations of urea dissolved in DMF (N-N dimethylformamide), the electromagnetic wave (EMW) absorption abilities of NiCo 2 O 4 /NiO/Co 3 O 4 composite effectively. A maximum reflection loss (RL max ) value at 12.94 GHz for a 2.8 mm thick sheet is -29.76 dB, while its effective absorption bandwidth (RL < -10 dB) reaches 4.21 GHz. In-depth research of possible mechanisms of EMW absorption enhancement. Owing to its simple preparation method and superb EMW absorption properties, the NiCo 2 O 4 /NiO/Co 3 O 4 composites have a chance to be suitable candidates for high-property EMW absorbers.