EMI shielding performance of nanocomposites with MWCNTs, nanosized Fe3O4 and Fe

In this paper, nanocomposites based on epoxy matrix with nano-sized multi-walled carbon nanotubes (MWCNTs), Fe3O4 and Fe fillers have been developed due to the application in electromagnetic interference (EMI) shielding. The nanocomposites specimens with different fillers, as well as varied filler weight fraction have been prepared. The microwave absorption of these nanocomposites specimens have been verified by vector network analyzer. Furthermore, trilayer-type laminated nanocomposites containing a matching layer with 15 wt% nano-Fe3O4, an absorbing layer with 5 wt% CNTs and a reflecting layer with 10 wt% CNTs have been designed and fabricated. Moreover, the permittivity and the permeability for each type of composites are tested as well. Experimental results show that such trilayer-type laminated nanocomposite has excellent micro-wave absorption effect in the frequency band (from 13 GHz to 40 GHz) up to 40 dB, especially in high frequency section. The achieved peak values of the fabricated laminated nanocomposites exceed 100 dB.