Reduced graphene oxide loaded with magnetic nanoparticles for tunable low frequency microwave absorption

Graphene-based microwave absorption materials have been profoundly and extensively investigated because of their excellent properties and is potential absorbing material. However, graphene-based absorbing materials about low-frequency remain to be researched and developed. Here we obtain that Reduced Graphene Oxide (RGO) modified with magnetic xNi/yNiO nanoparticles by a simple hydrothermal method, which presents a large reflection loss (RL) in S-band. The electromagnetic parameters, attenuation constants and impedance matching of xNi/yNiO/RGO composite were analyzed to determine the appropriate ratio of magnetic xNi/yNiO nanoparticles and GO. The maximum RL can reach −46.5 dB with a thickness of 3.6 mm at 3.57 GHz with a loading wax ratio of 15 wt%. The probability of falling on EAB is maximized to cover 94.5% of the S-band. Notably, the RL and efficient absorption bandwidth (EAB) of xNi/yNiO/RGO composite material can be adjusted according to the quarter wavelength matching theory. All the results indicate that xNi/yNiO/RGO composite has a great potential of low frequency absorbing material for low frequency absorbing material research on practical.