Sensitivity Enhancement of a Surface Plasmon Resonance with Tin Selenide (SnSe) Allotropes.

Xiaoyu Dai,Yue Jia,Yuting Zhao,Yuanjiang Xiang,Shuaiwen Gan,Yanzhao Liang

doi:10.3390/s19010173

Abstract

Single layers of tin selenide (SnSe), which have a similar structure as graphene and phosphorene, also show excellent optoelectronic properties, and have received much attention as a two-dimensional (2D) material beyond other 2D material family members. Surface plasmon resonance (SPR) sensors based on three monolayer SnSe allotropes are investigated with the transfer matrix method. The simulated results have indicated that the proposed SnSe-containing biochemical sensors are suitable to detect different types of analytes. Compared with the conventional Ag-only film biochemical sensor whose sensitivity is 116°/RIU, the sensitivities of these SnSe-based biochemical sensors containing α-SnSe, δ-SnSe, ε-SnSe, were obviously increased to 178°/RIU, 156°/RIU and 154°/RIU, respectively. The diverse biosensor sensitivities achieved with these three SnSe allotropes suggest that these 2D materials can adjust SPR sensor properties.

Highlights

Due to their high sensitivity, biocompatibility and detection accuracy, biochemical sensors based on the surface plasmon resonance technique have been investigated and applied in numerous chemical and biological applications [1], for instance, medical diagnostics, enzyme detection, and pharmaceutics [2,3,4]
The Surface plasmon resonance (SPR) phenomenon refers to the resonance excitation of the surface plasmon polaritons (SPPs) at the interface of negative and positive constant materials [5], which is suitable for label-free sensing and the real-time monitoring [6]
Single layers of tin selenide (SnSe) can be protect Ag from oxidation and increase biomolecule adsorption, we introduce SnSe

Summary

Introduction

Due to their high sensitivity, biocompatibility and detection accuracy, biochemical sensors based on the surface plasmon resonance technique have been investigated and applied in numerous chemical and biological applications [1], for instance, medical diagnostics, enzyme detection, and pharmaceutics [2,3,4]. The fantastic optical, electrical, chemical properties of TMDCs make them promising candidates and successful materials compared to graphene for the generation of optic and electronic devices [7,8,9]. Single layer SnSe possesses fantastic electrical and optical properties and generates high interest as a 2D material beyond the predecessor members, which displays the same structure as graphene and phosphorene [12,13]. As a classical p-type IV–VI semiconductor, SnSe has a narrow gap (~1.30 eV direct and ~0.90 eV indirect), and it shows less toxicity, and better A Kretschmann attenuated total reflection (ATR) configuration chosen as these and maintain their chemical stability This structure, a thin metallic silver (Ag) layer was covered on the basis the configuration wasInchosen as these SPR. SnSe allotropecovered [17,18]. with three types of SnSe allotrope [17,18]

Calculation Models and Methods

Sketch

Results and Discussion

Change in different

Conclusions