▎ 摘　　要

BiFeO3 (BFO), as a multiferroic oxide with remarkable dielectric properties, has attracted increasing concern in various fields. However, It has not been fully studied as a dielectric material to improve the performance of surface plasmon resonance biosensors. In this work, BiFeO3 film is placed between metal layer and graphene layer to enhance the sensitivity the SPR biosensor. By using angular interrogation, it is found that the highest sensitivity of 303 degrees/RIU can be achieved for the proposed SPR biosensor with Ag (45 nm)-BiFeO3 (10 nm)-monolayer graphene structure. Besides, the results also show that the highest sensitivity at lambda = 633 nm are 321 degrees/RIU and 412 degrees/RIU for the proposed SPR biosensors based on Al (35 nm) with BiFeO3 film (18 nm)-monolayer graphene and Cu (50 nm) with BiFeO3 film (12 nm)-monolayer graphene, respectively. Our work reveals potential applications of BiFeO3 film as a new type of supporting material for enhancing SPR effect, and BiFeO3 nanomaterial is expected to find potential applications in SPR biosensors.