研究目的
Investigating the polarization‐independent performance of a two-dimensional sinusoidal Ag nanograting as a surface-enhanced Raman scattering (SERS) substrate and its coupling with Au nanospheres colloids for enhanced SERS sensitivity.
研究成果
The 2D sinusoidal Ag nanograting exhibits excellent SERS polarization‐independent performance, with a stable enhancement factor over the entire 360° polarization angle. Coupling with Au nanospheres colloids further enhances the SERS sensitivity, making it suitable for real‐time, continuous monitoring of trace explosives in air. The DERS substrate shows potential for practical applications outside laboratory settings.
研究不足
The study is limited by the differences between ideal and real structures in the DERS substrate, which may affect the SERS enhancement factor. Additionally, the nonuniform distribution of Au nanospheres and its polarization‐dependent disadvantage could influence the reproducibility of the results.
1：Experimental Design and Method Selection:
The study involves the design of a 2D sinusoidal Ag nanograting fabricated by maskless laser interference photolithography and its coupling with Au nanospheres colloids for SERS enhancement. Finite difference time domain (FDTD) simulations were used to deduce the SERS polarization‐independent performance.
2：Sample Selection and Data Sources:
Rhodamine 6G (Rh6G) was used as a probe for SERS enhancement factor estimation. The morphologies of the fabricated 2D sinusoidal Ag nanograting were characterized with scanning electron microscopy (SEM).
3：List of Experimental Equipment and Materials:
Equipment includes a CW laser (Coherent MBD‐266), SEM, Raman spectrometer (Ocean Optics USB4000), and Raman probe (Inphotonics RPB fiber optic Raman probe). Materials include photoresist (NOA‐63), Ag layer, and Au nanospheres colloids.
4：Experimental Procedures and Operational Workflow:
The 2D sinusoidal nanograting was prepared by two-beam laser interference system with synchronization exposure at mutual vertical direction on the substrate. The Ag layer was thermally evaporated onto the dielectric part. SERS signals were measured with varying polarization angles and concentrations of Rh6G.
5：6G.
Data Analysis Methods:
5. Data Analysis Methods: The analytical enhancement factor (AEF) was used to evaluate the SERS enhancement factor. The electric field distribution and SERS performance were analyzed using FDTD simulations.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
