Open AccessSERS enhancement induced by the Se vacancy defects in ultra-thin hybrid phase SnSex nanosheets
Author(s) -
Chuansong Chen,
wenjie Zhang,
pengyi duan,
wenying liu,
Muhammad Shafi,
Xiaoxuan Hu,
can zhang,
C Zhang,
yuan man,
Mei Liu
Publication year - 2022
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.473965
Subject(s) - materials science , raman scattering , rhodamine 6g , raman spectroscopy , nanotechnology , molecule , substrate (aquarium) , nanomaterials , vacancy defect , optics , chemistry , crystallography , physics , oceanography , organic chemistry , geology
Improving the photo-induced charge transfer (PICT) efficiency by adjusting the energy levels difference between adsorbed probe molecules and substrate materials is a key factor for boosting the surface enhanced Raman scattering (SERS) based on the chemical mechanism (CM). Herein, a new route to improve the SERS activity of two-dimensional (2D) selenium and tin compounds (SnSe x , 1 ≤ x ≤ 2) by the hybrid phase materials is researched. The physical properties and the energy band structure of SnSe x were analyzed. The enhanced SERS activity of 2D SnSe x can be attribute to the coupling of the PICT resonance caused by the defect energy levels induced by Se vacancy and the molecular resonance Raman scattering (RRS). This established a relationship between the physical properties and SERS activity of 2D layered materials. The resonance probe molecule, rhodamine (R6G), which is used to detect the SERS performance of SnSe x nanosheets. The enhancement factor (EF) of R6G on the optimized SnSe 1.35 nanosheets can be as high as 2.6 × 10 6 , with a detection limit of 10 -10 M. The SERS result of the environmental pollution, thiram, shows that the SnSe x nanosheets have a practical application in trace SERS detection, without the participation of metal particles. These results demonstrate that, through hybrid phase materials, the SERS sensitivity of 2D layered nanomaterials can be improved. It provides a kind of foreground non-metal SERS substrate in monitoring or detecting and provide a deep insight into the chemical SERS mechanism based on 2D layered materials.