Silver nano lattice surface enhanced raman active substrate and preparation method thereof

Abstract

The invention discloses a silver nano lattice surface enhanced raman active substrate and a preparation method thereof. According to the substrate, silicon single crystal is used as an underlay; a silver nanoparticle array structure is deposited on the silicon surface; the particle size of the silver nanoparticles is 30-90 nm; and the center distance of the particles is 99-111 nm. The silver nano lattice surface enhanced raman active substrate provided by the invention has a uniform shape and a controllable structure, and has an obvious surface raman enhancement effect on analytes of different concentrations, and an enhancement signal is uniform and stable. According to the method, the structural parameters and the shape of a silver nano lattice can be adjusted according to structural parameters of an ultra-thin aluminum oxide template, so that different influences of different metal nano lattice substrates on a raman surface enhancement effect are realized. The substrate and the method have the advantages of easiness for operation, low cost and easiness for industrial production.

Description

technical field [0001] The invention relates to a silver nano-lattice surface-enhanced Raman active substrate and a preparation method thereof, in particular to a silver nano-lattice surface enhancement based on UTAM (Ultra-Thin Alumina Mask, ultra-thin alumina template) surface nano-preparation technology. Raman active substrate and method for its preparation. Background technique [0002] Surface-enhanced Raman Scattering (SERS) has attracted widespread attention since it was discovered in 1974, because of its high sensitivity, it can detect monomolecular layers and sublayers adsorbed on metal surfaces. Molecules in the monolayer, which can give the structural information of surface molecules, are considered to be a very effective tool for probing interface properties and intermolecular interactions, and characterizing surface molecular adsorption behavior and molecular structure. SERS technology has gradually become a powerful research method in the field of surface scie...

AI Technical Summary

Problems solved by technology

There are many traditional SERS active substrates commonly used at present, such as: electrochemically roughened noble metal active electrode substrates, noble metal sol active substrates, vacuum-evaporated noble metal island film active substrates, and chemically etched and chemically deposited noble metal active substrates. However, these self-assembled The surface roughness provided by the active substrate is difficult to control and thus affects the stability, uniformity and repeatability of the spectra of adsorbed molecules

In recent years, the methods for preparing ordered surface nanostructures that have been studied more have some disadvantages and limitations in preparation and application. For example, the surface nanostructures prepared by electron beam lithography and scanning probe method have a small area, Low yield and expensive equipment; for self-organized growth methods and nanoimprint methods, it is often difficult to adjust the structural parameters of surface nanostructures

Moreover, its development is limited due to its cumbersome preparation procedures, high preparation costs and low preparation efficiency.

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