The effect of the thickness of Fe shell on the electromagnetic wave absorption properties of hollow Fe–Co double shell particles

In this study, hollow Fe–Co double shell particles were synthesized successfully by electroless plating different amount of Fe on hollow Co particles. The atom content ratio of Fe and Co of three samples were 3:7, 5:5, and 7:3. The electromagnetic (EM) wave absorption properties of three samples were investigated. The results indicated that the atom content ratio of Fe and Co was critical to the EM wave absorption properties of hollow Fe–Co double shell when blended with 60 wt% in paraffin-based samples. Hollow Fe–Co double shell particles with the atom ratio of Fe/Co of 5:5 showed the best EM wave absorption properties with minimum reflection loss of − 47.30 dB, effective bandwidth of 4.93 GHz under − 10 dB and the thickness of 1.5 mm. The present work has a significant potential for the development of EM wave absorbing materials with hollow structure.