Abstract：This study investigates the microwave absorption performance of Fe3O4/CNT nanocomposites. It is found that the changes of CNT content can cause a strong impact on the absorption performance of Fe3O4/CNT nanocomposites. Sample with the addition of CNTs at 50 mg (Fe3O4/CNT-50) shows very low minimum reflection loss values of -50.37 dB at 4.15 GHz with a matching thickness of 5.5 mm. While by further increasing the adding content of CNTs to about 70 mg (Fe3O4/CNT-70), the nanocomposite shows a decline of its reflection loss value to -29.44 dB, corresponding to a matching thickness of 2.5 mm. However, it is noteworthy that the effective bandwidth of this sample can be further broadened to 3.83 GHz (13.75-17.58 GHz) when the matched thickness was reduced to 1.5 mm. These results indicate that by adjusting the content of dielectric materials (CNT) in the microwave absorbing nanocomposites, it is possible to adjust not only the loss value of the material but also the location and bandwidth of their microwave absorption peak to meet the requirements at the point of care.
2022, Vol. 29 