Sensitivity Enhanced Surface Plasmon Resonance (SPR) Sensors with MoS2/Graphene Hybrid Overlayer

Abstract

A performance enhanced surface plasmon resonance (SPR) sensor has been designed with a molybdenum disulfide (MoSr2/graphene hybrid layer. Atomically thin transition metal dichalcogenide (TMDC) nanomaterials like Mos2 have exhibited better optical and electronic properties in the two-dimensional (2D) scale. The MoS2/graphene hybrid overlayer protects the metal layer of the SPR sensor from undesired oxidation and retains higher sensitivity. As they have large surface to volume ratio and adjustable biocompatibility, the sensor performance increases several times than only graphene based configuration. The proposed SPR sensor includes a titanium (Ti) layer which enhances the adherence level between silver and prism glass. Sensitivity factor (SF), sensor merit (SM), full-width at half-maximum (FWHM) and combined sensitivity factor (CSF) have been used to measure the performance of the proposed sensor. The proposed sensor has the SF of 71.260/RIU and CSF of 372.72 RIU−1, which are much higher than the existing sensor configuration without MoS2 overlayer.