High-stability non-polarization-dependent surface enhanced Raman scattering (SERS) substrate, and preparation process and application

Abstract

Disclosed are a high-stability non-polarization-dependent surface enhanced Raman scattering (SERS) substrate, and a preparation process and application. The preparation technology of the substrate belongs to the field of material physical chemistry and the application category of the substrate belongs to the field of light scattering science and surface plasma science. The substrate is a regular array formed through periodical arrangement of equilateral trimers of gold nanoparticles. The preparation process includes the steps that firstly, a layer of extremely thin aluminum oxide nanometer pit equilateral trimer periodical array is prepared on an aluminum substrate through electrochemical corrosion; then a layer of extremely thin gold nano-film is deposited on the array; and the nanometer pit array substrate where the gold film is deposited is annealed to obtain the gold nanoparticle equilateral trimer periodical array, that is the high-stability non-polarization-dependent SERS substrate. The high-stability non-polarization-dependent SERS substrate has the outstanding advantages that during SERS detection, the exciting light polarization direction is avoided in all 360-degree range, and an SERS signal is stably output at all angles.

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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