Microwave absorption properties of graphene oxide capsulated carbonyl iron particles

To evaluate the microwave absorption properties of the graphene oxide (GO) sheets capsulated on carbonyl iron particles (CIP), we synthesized the GO capsulated on carbonyl iron particles (GOCIPs) by a simple wet stirring process. Complex permittivity were increased with the increment of mass ratio of GO in GOCIPs from 0.5 to 2 wt % while the complex permeability values were not changed. The maximum reflection loss (RLmax) and frequency bandwidth at -10 dB (BW@-10 dB) of the 1.9 mm thick-GOCIP composite with 2.0 wt% of GO in GOCIPs exhibited about -56.4 dB @10.8 GHz and 5.1 GHz. The RLmax frequency shifted to lower frequency with the increment of absorber thickness from 1 mm to 3 mm. BW@-10 dB decreased with the increment of absorber thickness.