Lightweight Chain-Typed Magnetic Fe 3 O 4 @rGO Composites with Enhanced Microwave-Absorption Properties.

A lightweight microwave-absorbing material with a strong electromagnetic-absorption capability of practical significance in the field of electromagnetic compatibility was obtained by adjusting the ratio of Fe 3 O 4 and rGO. A nanoparticle material with a chain-typed structure consisting of a combination of Fe 3 O 4 and rGO was produced by a hydrothermal method under an applied magnetic field. The electromagnetic loss property of the Fe 3 O 4 @rGO composites is studied in the frequency range from 2 to 18 GHz. In addition, the reflection loss and the mechanism of microwave absorption are explored. By changing the amounts of rGO, the electromagnetic loss of the Fe 3 O 4 @rGO composites can be effectively regulated, which obtain better reflection loss. The minimum reflection loss of the Fe 3 O 4 @rGO composites is -49.4 dB at 16.2 GHz only with a thickness of 1.75 mm. Thus, the Fe 3 O 4 @rGO composites have an extremely thin thickness and a strong electromagnetic wave absorption capacity, which is a candidate for the development of lightweight magnetic absorbing materials.