Sensitivity Enhancement of Surface Plasmon Resonance Biosensor with 2-D Franckeite Nanosheets

The sensitivity of a standard surface plasmon resonance (SPR) biosensor in angular interrogation is low. A unique 2-dimensional substantial heterostructure, franckeite/graphene layer, has been deposited over the metal surface to improve the sensitivity; moreover, the sensitivity is limited to a certain extent. A SPR biosensor based on modified Kretschmann configuration has been investigated, contain bimetallic layers of silver (Ag) and nickel (Ni). A layer of franckeite is sandwich in the metal layer. The proposed configuration has a maximum sensitivity of 352°/RIU, which is 80.80% higher than the conventional sensor. The franckeite is an air-stable 2-D material and has application in the chemical, biological, and medical fields.