Synthesis and characterization of BiFeO_3/RGO composites for promising microwave absorption materials

摘要

In this paper, BiFeO_3 (BFO) and reduced graphene oxide (RGO) composites were synthesized by ultrasonic assisted hydro-thermal reduction method. The structures of BFO and BFO/RGO composites were analyzed by XRD, Raman and TG methods. With the aid of SEM and TEM, we observed the slice layer structure of the composites. All the composites have excellent electromagnetic(EM) wave absorption capacity, the maximum reflection loss (RL) value of sample BFO/RGO-2 reached up to -32.3 dB at a thickness of 2 mm, and the effective bandwidth was 4.1 GHz (＜- 10 dB). The 3 mm wave attenuation performance of sample BFO/RGO-3 was up to 10.3 dB, which is higher than that of pure BFO (5.5 dB). The impressive EM absorption performance of the composites was attributed to the combination of BFO and RGO, which greatly enhanced the electrical conductivity and dielectric loss. We claim that BFO/RGO composite is a promising material which can be applied to microwave absorption.