Silver nanoparticle cap array surface-enhanced Raman activity substrate and preparation method thereof

Abstract

The invention discloses a silver nanoparticle cap array surface-enhanced raman activity substrate and a preparation method thereof. The substrate is formed in a way that a silver film with an order nanoparticle cap array structure adhered to a silicon single crystal underlayer, the thickness of the silver film is 80-150mm, silver nanoparticle caps are in raised foam-shaped structures the centers of which are provided with holes, the diameters of the silver nanoparticle caps are 30-95nm, and center distance of the adjacent two adjacent nanometer caps is 100-110nm. The silver nanoparticle cap array surface-enhanced raman activity substrate provided by the invention has the advantages that the morphology is uniform, the structure is controlled, the prominent surface raman enhancing effects can be realized on analytes with different densities, the enhancing factor can achieve 109, and an enhancing signal is uniform and stable. A method provided by the invention has the advantages that structure parameters and morphologies of the silver nanoparticle caps are adjusted according to structure parameters of an ultrathin alumina template and a metal sedimentation process, and parameters of the silver nanoparticle cap array substrate can adjust and control the surface raman enhancing effect, the operation is simple, the cost is low, the volume production is easy, and the repeatability of products among different batches is high.

Description

technical field [0001] The invention relates to a surface-enhanced Raman active substrate and a preparation method thereof, in particular to a surface-enhanced Raman active substrate of a silver nanocap array and a preparation method thereof. Background technique [0002] Since Surface-enhanced Raman Scattering (SERS) was discovered in 1974, it has been widely used in the fields of surface interface science, analytical science and biomedicine. Structures and processes provide information at the molecular level. After continuous development and research, it has shown great potential in the fields of life science and nanoscience, because of its high sensitivity, it can detect the monolayer and sub-monolayer molecules adsorbed on the metal surface, and It can give the structural information of surface molecules and is considered to be a very effective tool to probe interface properties and intermolecular interactions, and to characterize surface molecular adsorption behavior a...

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, noble metal dendrite substrates, and chemical etching and chemical deposition of noble metals. substrates, however, the surface roughness provided by these self-assembled active substrates 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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