Preparation method of substrate for improving Raman scattering effect on surface of zinc oxide wrapped by silver and gold nanoparticles

Abstract

The invention belongs to the field of improvement of the Raman scattering effect on the surfaces of silicon chips and discloses a preparation method of a substrate for improving the Raman scattering effect on the surface of zinc oxide wrapped by silver and gold nanoparticles. The method comprises the steps that a polystyrene microsphere layered array which covers the silicon chip substrate is subjected to gold steaming operation, and then an electrodeposition method is used for obtaining a zinc oxide nanorod array; then, the materials are soaked in a methylbenzene solution and washed by deionized water; the gold steaming operation is conducted again; finally, through a primary cell sedimentation method, silver nanoparticles are deposited on the surface of a zinc oxide nanorod hollow ball.According to the method, in combination with the chemical improvement function of zinc oxide and the physical improvement function of silver, the obtained substrate has high SERS activity; the complex-layer nanometer structure is arrayed regularly in order, the SERS signal homogeneity and repeatability of the substrate are good, and coupling of the high electromagnetic field can be achieved through a sea urchin shape; the preparation process is simple and low in cost, and the prepared product can be widely applied to quick detection in the fields of environment, chemistry, biology and the like.

Description

technical field [0001] The invention relates to the field of silicon chip surface-enhanced Raman scattering effect, in particular to a method for preparing a surface-enhanced Raman scattering effect substrate coated with silver and gold nanoparticles. Background technique [0002] Theoretical and experimental studies have shown that the Surface-Enhanced Raman Scattering (SERS) effect mainly comes from two enhancement methods: physical enhancement and chemical enhancement. Materials with SERS activity mainly include noble metals Au, Ag, Cu, etc., transition Metal Fe, Co, Ni, etc. and semiconductor Si, ZnO, TiO 2 , NiO and other three types of materials. When other conditions are the same, noble metals have the characteristics of high SERS activity and stable chemical properties, and are widely used as SERS substrate materials. Semiconductors have attracted widespread attention because of their low cost, good biochemical affinity, and easy formation of complex nanostructures...

AI Technical Summary

Problems solved by technology

In addition, since the nanostructure units of the SERS substrate synthesized by AAO are limited to simple shapes such as nanowires or nanorods, the electromagnetic field coupling between them is weak, and the enhancement effect that can be provided is limited.

In addition, the method of preparing alumina templates generally takes a long time and consumes electricity, wasting energy

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