Near-Neighbor Electron Orbital Coupling Effect of Single-Atomic-Layer Au Cluster Intercalated Bilayer 2H-TaS 2 for Surface Enhanced Raman Scattering Sensing.
Shirui WengWenjun ChuHuaze ZhuJunxiang LiRonglu DongRui NiuJun YangChangjin ZhangZhenyu LiLiangbao YangPublished in: The journal of physical chemistry letters (2023)
It is difficult to perfectly analyze the enhancement mechanism of two-dimensional (2D) materials and their combination with precious metals as surface enhanced Raman scattering (SERS) substrates using chemical enhancement mechanisms. Here, we propose a new mentality based on the coupling effect of neighboring electron orbitals to elucidate the electromagnetic field enhancement mechanism of single-atom-layer Au clusters embedded in double-layer 2H-TaS 2 for SRES sensing. The insertion of Au atoms into the 2H-TaS 2 interlayer was verified by XRD, AFM, and HRTEM, and a SERS signal enhancement of 2 orders of magnitude was obtained compared to the pure 2H-TaS 2 . XPS and micro-UV/vis-NIR spectra indicate that the outer electrons of neighboring Au and 2H-TaS 2 overlap and migrate from Au to 2H-TaS 2 . First-principles calculations suggest strong electronic coupling between Au and 2H-TaS 2 . This study offers insights into SERS enhancement in nonprecious metal compounds and guides the development of new SERS substrates.
Keyphrases
- sensitive detection
- quantum dots
- gold nanoparticles
- reduced graphene oxide
- density functional theory
- electron transfer
- molecular dynamics
- room temperature
- raman spectroscopy
- photodynamic therapy
- high resolution
- solar cells
- mass spectrometry
- molecular dynamics simulations
- drug delivery
- high speed
- health risk
- drinking water
- atomic force microscopy
- heavy metals
- health risk assessment
- electron microscopy