Enhanced Microwave Absorption Properties of FeNi Nanocrystals Decorating Reduced Graphene Oxide

Abstract

The composite of FeNi nanocrystals (size of 10–100 nm) decorating reduced graphene oxide (rGO) sheets (FeNi@rGO) is prepared by hydrothermal reaction and hydrogen reduction. Compared with sole FeNi nanocrystals, the FeNi@rGO composite possesses a lower frequency of the optimal reflection loss (RL) and a greatly enhanced RL value. An optimal RL of −26.7 dB has been achieved at 4.8 GHz by measuring the composite with thickness of 4.55 mm, which is attributed to the combination of FeNi with excellent magnetic loss and rGO with outstanding dielectric loss, respectively. Obviously, the FeNi@rGO composite has an enormous potential as a microwave absorbing candidate due to its admirable microwave absorption performance.

Electromagnetic Wave Absorption Properties of Barium Ferrite/Reduced Graphene Oxide Nanocomposites

“…The reflection loss (RL) can be calculated by the following equation [20]: where Z0 is the impedance of air and Zin is the input impedance at the interface between the absorber and air. This parameter is related to the EM parameters of the absorber material as follow [20]:…”

“…Carbon-based materials such as CNTs, porous carbon, carbon spheres, graphene, and rGO have superior electromagnetic wave reflection loss efficiency. The rGO with a high dielectric loss is a great candidate for use in EM wave absorber materials [20]. Graphene, a monolayer sheet of carbon atoms in the form of a hexagonal two-dimensional structure with sp 2 hybridization, has attracted extensive attention due to its mechanical, electrical, and thermal properties.…”