High-performance bimetallic layer plasmonic sensors: a comparative study among Ti3C2Tx, black phosphorus and WS2
Résumé
In this study, we explore by numerical computation a very sensitive biosensor with a high detection accuracy, a bimetallic rhodium (Rh)/gold (Au) nanostructure is proposed. A further improvement of the sensitivity and figure of merit (FoM) is obtained by applying a layer of LiNbO3 and some 2D nanomaterials. Few nanolayers of Ti3C2Tx MXene, black phosphorene (BP) and tungsten disulfide (WS2) are selected to improve the detection performance of the nanoplasmonic biosensor. A detailed analysis was performed to design the high-performance biosensor by exploiting the optimization properties of each of the nanostructure layers for maximum sensitivity in the visible range at an excitation wavelength of 633 nm. The biosensor has a high sensitivity of 420 deg/RIU with a 228.125% improvement in sensitivity for analyte refractive indices ranging from 1.30 to 1.37 and FoM = 75.71 RIU−1. The integration of Ti3C2Tx MXene, BP or WS2 with bimetallic in a conventional surface plasmon resonance biosensor offers a promising approach for bio- and chemical sensing, opening new possibilities for highly sensitive surface plasmon resonance biosensors using 2-dimensional nanomaterials.