Synthesis and enhanced microwave absorption properties of PVB/Co2Z/RGO layered composite

Polyvinyl Butyral (PVB)/Co2Z/reduced graphene oxide (RGO) layered composite was successfully prepared by a simple casting process in order to enhance impedance match. PVB acts as a matrix in this composite. The layered structure makes electromagnetic wave pass through the two layers successively, thereby resulting in the attenuation of electromagnetic wave. The results show that the hybrid PVB/Co2Z/RGO composite exhibits a highly efficient microwave attenuation property compared with the PVB/Co2Z and PVB/RGO composite in a wide frequency range due to the dielectric loss caused by the introduction of RGO. For the as-prepared PVB/Co2Z/RGO composite, an optimal reflection loss (RL) as low as −35.2 dB can be observed at 14.7 GHz with an absorber thickness of only 2 mm and the effective absorption bandwidth corresponding to the reflection loss below −10 dB is 4.24 GHz. Findings indicate that the layered PVB/Co2Z/RGO composite might be a promising candidate for a lightweight electromagnetic wave absorbing material.