Gold nanocap array surface enhanced Raman active substrate and preparation method thereof

Abstract

The invention discloses a surface-enhanced Raman active substrate with a gold nano cap array and a preparation method thereof. The preparation method comprises the following steps of using an aluminum base sheet of which the surface is provided with an ordered pit array structure as a formwork, depositing a gold thin film, then removing the aluminum base sheet, turning the lower surface, transferring upwards, and fixing to the surface of a glass substrate, so as to obtain a gold nano cap array structure which has a large area greater than 1cm<2> and ordered height. The surface-enhanced Raman active substrate with the gold nano cap array has the beneficial effects that the appearance is uniform, the structure is controllable, the obvious surface-enhanced Raman effect for analyzing objects different in concentrations is realized, and the enhanced signals are uniform and stable (with relative standard deviation smaller than 2%). The method has the beneficial effect that according to the structure parameters of the formwork, the structure parameters and the appearance of a gold nano cap are adjusted, so different influences on the surface-enhanced Raman effect by the different gold nano array substrates are realized. The substrate and the preparation method have the advantages that the operation is simple, the cost is low, and the industrial production is easy.

Description

technical field [0001] The invention relates to a surface-enhanced Raman active substrate and a preparation method thereof, in particular to a gold nanocap array surface-enhanced Raman active substrate based on a porous alumina template method surface nano-preparation technology and a preparation method thereof. Background technique [0002] Surface-enhanced Raman Scattering (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 subunit molecules adsorbed on metal surfaces. It is 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 science and electrochemistry, and has been widely used in trace analysis and even single molecule dete...

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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