Preparation and wave absorption properties of ZnO@RGO composites

With the rapid development of wireless information technology, electromagnetic interference has become a prominent problem, which has attracted worldwide attention. Exposure to electromagnetic radiation for a long time will damage the central nervous system, cardiovascular system and visual system to varying degrees. The key to solving this problem is to develop materials that can absorb electromagnetic waves. In order to improve the microwave absorption properties of reduced graphene oxide (RGO), the tetrahedral needle-like ZnO was successfully obtained by induction heating, and ZnO@RGO composites with different proportions were prepared by simple hydrothermal method. The morphology, size, and phase structure of ZnO@RGO composites were analyzed by SEM, XRD and Raman. And the effects of the mass ratio of ZnO and the paraffin filling amount on the electromagnetic parameters and absorbing properties of ZnO@RGO composites were also discussed. The ZnO@RGO composite with ZnO∶GO mass ratio of 3∶1 has the best wave absorption performance (−44.5 dB; 3 mm). Electromagnetic parame-ters show that the attenuation mechanism of ZnO@RGO composites can be attributed to the conductance loss and polarization effect. ZnO@RGO composites have a low reflection loss value and thin thickness, which has great potential for military stealth.