Abstract
The extraordinary optoelectronic properties of platinum diselenide (PtSe2), whose structure is similar to graphene and phosphorene, has attracted great attention in new rapidly developed two-dimensional (2D) materials beyond the other 2D material family members. We have investigated the surface plasmon resonance (SPR) sensors through PtSe2 with the transfer matrix method. The simulation results show that the anticipated PtSe2 biochemical sensors have the ability to detect analytic. It is evident that only the sensitivities of Ag or Au film biochemical sensors were observed at 118°/RIU (refractive index unit) and 130°/RIU, whereas the sensitivities of the PtSe2-based biochemical sensors reached as high as 162°/RIU (Ag film) and 165°/RIU (Au film). The diverse biosensor sensitivities with PtSe2 suggest that this kind of 2D material can adapt SPR sensor properties.
Highlights
We have investigated biochemical sensors based on the surface plasmon resonance technique, which has been applied in extraordinary biological and chemical applications, because of their biocompatibility, excellent sensitivity, and accurate detection for pharmaceutics, for instance, in medical diagnostics and enzyme detection [1,2,3,4]
In these Surface plasmon resonance (SPR) structures, the Ag or Au film is installed on top of the BK7 coupling prism, and the PtSe2 layer is the biomolecular recognition element coated on the Ag/Au film surface
Because of the low refractive index of BK7 glass, it was chosen as the coupling prism in these expected biochemical sensors
Summary
We have investigated biochemical sensors based on the surface plasmon resonance technique, which has been applied in extraordinary biological and chemical applications, because of their biocompatibility, excellent sensitivity, and accurate detection for pharmaceutics, for instance, in medical diagnostics and enzyme detection [1,2,3,4]. Wu et al obtained the highest sensitivity of 134.6◦ /RIU by using a graphene layer for the SPR biosensor to enhance the sensitivity caused by the light absorbed [15,19]. As single-layer PtSe2 exhibits the same pattern of structure as graphene and phosphorene, it keeps excellent optical and electrical properties that have attracted great attention as a 2D material beyond the predecessor members [10,23,24]. The band gap of PtSe2 is highly tunable because of its intrinsic quantum confinement effect and strong interlayer interaction This leads to a type-II Dirac semimetal-to-semiconductor transition when going from bulk to few-layer form and exhibits the largest band gap of ~1.2 eV for monolayer (ML) PtSe2 (from theoretical prediction) [26,27]. We have used Ag or Au to cover, on the basis of the optical coupling prism, BK7 glass to be used as the coupling prism, and PtSe2 covers the metallic layer in this structure [34,35]
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