Highly Sensitive SPR Sensor Based on Ag-ITO-BlueP/TMDCs-Graphene Heterostructure

The novel surface plasmon resonance (SPR) sensor based on hybrid structure of Ag-indium tin oxide (ITO)-blue phosphorene (BlueP)/transition metal dichalcogenides (TMDCs)-graphene is presented. The BlueP/TMDCs heterostructure works as an interacting layer with the analyte for the enhancement of the of the sensor’s sensitivity. For angular sensitivity, when the BlueP/WS 2 and graphene are both monolayer, the highest angular sensitivity with 348.8°/RIU is obtained. The maximum angular sensitivity of our proposed SPR sensor is about 2.83 times of the conventional sensor. For phase sensitivity, when the BlueP/WSe 2 is monolayer and graphene is bilayer, the highest phase sensitivity with 3.603 × 10 6 deg/RIU is obtained. The highest phase sensitivity of our proposed SPR sensor is about 2.78 times of the Ag-ITO-graphene structure and 4.16 times of the Ag-ITO structure. The SPR sensor has the advantages of high sensitivity, repeatability, and reusability, so it has a good prospect application for food safety detection, biological engineering, medical diagnosis, and biochemical detection.