Nanometer material for SERS (Surface-Enhanced Raman Scattering) detection and preparing method of nanometer material

Abstract

The invention discloses a nanometer material for SERS (Surface-Enhanced Raman Scattering) detection and a preparing method of the nanometer material. The nanometer material is composed of an inner core and an outer shell wrapping the outer side of the inner core. The inner core comprises micropore silicon dioxide particles with the particle size of 300-450 nanometers, and the outer shell is formed by gathering silver nanometer particles with the particle diameter of 5-80 nanometers. The preparing method comprises the following steps that the micropore silicon dioxide particles are prepared and a micropore silicon dioxide-silver core-shell nanometer material is prepared. The preparing method has the beneficial effects that the prepared inner core made of the nanometer material comprises the micropore silicon dioxide particles with the particle size of 300-450 nanometers, and due to the fact that a large number of micropores in the surfaces of the micropore silicon dioxide particles can load more Raman labeled molecules, the Raman labeled molecules are located in the surface local electromagnetic field generated by the silver nanometer particles on the outer layer through external lasers, SERS signals with extremely high strength are output, the nanometer material has higher SERS activity, and accordingly the SERS detection capability is greatly improved.

Description

technical field [0001] The invention relates to material engineering and nanotechnology, in particular to a nanomaterial used for SERS (Surface-Enhanced Raman Scattering, Surface-Enhanced Raman Scattering) detection and a preparation method thereof. Background technique [0002] Noble metal nanomaterials have attracted extensive attention due to their unique chemical and optical properties compared with bulk materials. Especially when interacting with electromagnetic radiation with a specific frequency, noble metal nanoparticles can generate significantly enhanced electromagnetic fields, making them promising applications in the field of SERS detection. Compared with other noble metal materials, silver is cheaper and can generate a stronger local electromagnetic field, but due to its poor stability, silver nanoparticles existing alone are easily deteriorated and lose SERS activity. [0003] In order to solve the technical problem that the silver nanoparticles that exist alo...

AI Technical Summary

Problems solved by technology

Compared with other noble metal materials, silver is cheaper and can generate a stronger local electromagnetic field, but due to its poor stability, silver nanoparticles existing alone are very easy to deteriorate and lose SERS activity.

[0003] In order to solve the technical problem that the silver nanoparticles that exist alone are extremely easy to deteriorate and lose SERS activity, someone proposed a better method, that is, to coat silver nanoparticles on the surface of silica to form a core-shell structure to make them exist stably, but Silica is easy to cause the SERS signal to be scattered a lot, which greatly reduces the SERS detection ability of this core-shell structure.

Images