Nanogrooves and 2D Material Help Boost Raman Signal SERS 2Dmaterials nanomaterials spectroscopy raman ramanspectroscopy
By Bhavna KavetiSep 9 2022Reviewed by Susha Cheriyedath, M.Sc. Surface-enhanced Raman spectroscopy is a powerful analytical tool for analyzing plasmonic-2D materials at hotspots. Moreover, hotspots are critical in SERS because they are the places with intense local electromagnetic fields and contribute a proportion of the overall SERS intensity.
Analytical Techniques to Enhance Raman Signal Raman Spectroscopy is a non-destructive chemical analysis technique that provides detailed information about chemical structure, polymorphy, crystallinity, and molecular interactions. It is based on the interaction of light with the chemical bonds within a material.
In RRS, when the excitation wavelength coincides with the excitonic transition or is close to the analyte's absorption band, the Raman signal amplifies, increasing sensitivity and selectivity. However, RRS strongly depends on the excitation wavelength, limiting the analytes in Raman spectroscopy. Nanophotonics investigates the behavior of light on nanometer scales and the interactions of nanometer-sized objects with light. Nanophotonics often includes metallic components that can transport and focus light through surface plasmon polaritons.
Enhancing Raman Spectra by Coupling Plasmons and Excitons In the present work, molten sodium molybdate was used as a precursor and uniformly distributed on the film via the chemical vapor deposition process. The resulting monolayered MoS2 films were used as analytes for quantitatively studying Raman signal enhancement.
Unlike previous studies that focused only on the SERS effect, the plasmonic resonance in the present work was designed to couple with MoS2 excitons instead of the excitation wavelength. Additionally, coupled and decoupled samples were studied to quantitatively analyze the Raman enhancement factors. Thus, through the findings of the present work, plasmon-exciton coupled hotspots were studied, including low-concentration molecules and low-dimensional nanomaterials.
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