ZnO and Bi-metallic (Ag-Au) Layers Based Surface Plasmon Resonance (SPR) Biosensor with BaTiO3 and Graphene for Biosensing Applications

In this work, a novel design of Zinc Oxide (ZnO) and bi-metallic (Ag-Au) layers based surface plasmon resonance (SPR) biosensor with barium titanate (BaTiO3) and graphene is proposed. The proposed structure consists of SF10 glass prism, ZnO, Ag, Au, BaTiO3, and graphene as a top layer for biomolecules adsorption. Here, the performance of this structure is studied and analysed for sensitivity along with the accuracy of detection and quality parameter for the shift in refractive index (RI) from 1.33 (sensing medium) to 1.45 and our reported results show that addition of bimetallic (Ag-Au) layers along with BaTiO3, improve the sensitivity of the proposed structure to 14.85% for the same RI range compared to last reported MoS2-graphene-based SPR sensor. Here at maximum sensitivity is reported as 116.67 degree/RIU while the accuracy of detection and the quality parameter are obtained as 4.54 and 37.87 RIU-1 respectively. These high-performance parameters of the design make this structure suitable for biosensing applications.

Automated summary

This work proposes a novel design of Zinc Oxide (ZnO) and bi-metallic (Ag-Au) layers based surface plasmon resonance (SPR) biosensor with barium titanate (BaTiO3) and graphene. The addition of bimetallic (Ag-Au) layers along with BaTiO3 improves the sensitivity of the proposed structure by 14.85% compared to the last reported MoS2-graphene-based SPR sensor within the same refractive index range.