Gold micron feather cluster modified with silver nanoparticles and preparation method and application thereof

Abstract

The invention discloses a gold micron feather cluster modified with silver nanoparticles and a preparation method and application thereof. The gold micron feather cluster is characterized in that the silver nanoparticles are coated on an aluminum sheet, of which the surface is provided with pit arrays, wherein the particle diameter of the silver nanoparticles is 15-25 nm, and the gold micron feather cluster has the diameter of 32-658 microns and consists of gold micron feathers which consist of gold nanoparticles with the particle diameter of 200 nm to 1 micron and have the feather rod length of 16-329 microns, the feather branch length of 8-160 microns and the small feather branch length of 2-13 microns. The method comprises the following steps of: firstly obtaining the aluminum sheet, of which the surface is provided with the pit arrays which are hexagonally arranged in an orderly manner and are bowl-shaped, by using an anodic oxidation method; carrying out gold nanoparticle ion sputtering on the aluminum sheet so as to obtain the aluminum sheet coated with the gold nanoparticles; then putting the aluminum sheet coated with the gold nanoparticles in an argon atmosphere, and annealing so as to obtain the aluminum sheet coated with the gold micron feather cluster; and carrying out silver nanoparticle ion sputtering on the aluminum sheet coated with the gold micron feather cluster, thereby producing a target product. The gold micron feather cluster modified with the silver nanoparticles can serve as a surface-enhanced Raman scattering active substrate, and the content of rhodamine or tetrachlorobiphenyl attached onto the gold micron feather cluster is measured by using a laser Raman spectrometer.

Description

technical field [0001] The invention relates to a micron plume cluster and its preparation method and application, in particular to a gold micron feather cluster modified with silver nanoparticles and its preparation method and application. Background technique [0002] Silver, a precious metal with excellent ductility, electrical conductivity, thermal conductivity, and chemical stability, has been widely used in many fields. Recently, people have made various attempts and efforts in order to further explore and expand the application range of precious metal silver, such as "a kind of SERS biological probe and its Preparation". The description of the patent application for this invention describes a SERS bioprobe in which a silver nanoparticle layer and a silicon dioxide layer are sequentially formed outside the solid silicon dioxide particles, wherein the silver nanoparticle layer and the silicon dioxide layer are connected by a pulley. Mann signal molecules, the surface ...

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Problems solved by technology

However, there are deficiencies in both the product and its preparation method. First, although the product has the ability to recognize biological probes, it has limited contribution to the enhancement of SERS activity because it is a monomer with a core-shell structure. Composing many monomers into a SERS substrate makes its structure unstable because it is difficult to form a fixed shape; secondly, the silicon dioxide layer formed outside the silver nanoparticle layer hinders the enhancement of the surface by silver nanoparticles when the product is used as a SERS substrate. The enhancement of the Raman scattering signal reduces the utilization efficiency of the incident light and weakens the Raman signal; finally, the preparation method is not only too cumbersome, but also uses a variety of organic reagents, such as polyethyleneimine, tetraethyl orthosilicate , p-mercaptoaniline, 2-mercaptonaphthalene, etc., many of which are toxic and harmful to the environment and human body, and it is impossible to prepare substrates with fixed morphology and high SERS performance

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