A Highly Stable Polarization-Independent Surface-Enhanced Raman Scattering Substrate, Its Preparation and Application

Abstract

Provided are a high-stability, non-polarisation-dependent, surface-enhanced Raman scattering substrate, and the preparation and use thereof, wherein the preparation technique belongs to the field of material physical chemistry, the use thereof belongs to the fields of light scattering science and surface plasma science, and the substrate is a regular array formed by an equilateral trimer of gold nano-particles in a periodic arrangement. The preparation process involves: firstly, preparing, on an aluminium substrate, a layer of a periodic array of extremely thin alumina nano pit equilateral trimers by means of electrochemical corrosion; then, depositing a layer of extremely thin gold nano-film on the array; and then, annealing the nano pit array substrate with the gold film deposited thereon to obtain a gold nano-particle equilateral trimer periodic array, i.e. the high-stability, non-polarisation-dependent, surface-enhanced Raman scattering substrate. The substrate has the prominent advantage of all-angle stable output of a surface-enhanced Raman scattering signal within a full range of 360¡ã independent of an excitation light polarisation direction during the process of surface-enhanced Raman scattering detection.

Description

technical field [0001] The invention relates to a high-stability non-polarization-dependent surface-enhanced Raman scattering substrate, preparation technology and application. The preparation technology belongs to the field of material physics and chemistry, and the application field belongs to the fields of light scattering science and surface plasmon science. technical background [0002] The surface-enhanced Raman scattering (SERS) effect is a high-sensitivity trace analysis and detection technology that can amplify the molecular light scattering signal by at least a million times, and its extreme detection ability can even realize the detection and identification of single molecules. Great scientific research significance, wide-ranging practical application prospects and potential high commercial value. The mechanism is derived from the extremely strong localized surface plasmon oscillations generated when the noble metal nanostructures are excited by external electroma...

AI Technical Summary

Problems solved by technology

This ubiquitous large defect makes the signal output of today's surface-enhanced Raman substrates extremely uncertain, unreliable and low-reproducible

Especially in the actual production and life testing sites outside the laboratory, it is impossible to identify the optimal localized surface plasmon oscillation excitation direction of the nanoscale structure, let alone the relationship between the electric field polarization direction of the excitation light and the optimal nanostructure. Optimum Excitation Direction for Matching

Therefore, due to the polarization-dependent optical properties of the existing noble metal nanostructures, the surface-enhanced Raman scattering signal excited by the substrate has a fatal flaw of great uncertainty, unreliability and low reproducibility. As a result, surface-enhanced Raman scattering technology has not been widely used in actual production and life.

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