Method for producing high-surface reinforced Raman scattering active single-layer silver nanoparticle film

Abstract

The invention discloses a method for preparing a single-layer silver nanoparticle film with high surface enhanced Raman scattering activity, relates to a method for preparing a self-assembly single-layer silver nanoparticle film with high SERS activity, and generally relates to a metal nano material. The preparation method comprises the following steps: firstly, preparing silver colloid as a raw material for standby; secondly, carefully cleaning a glass slide; thirdly, self-assembling a single layer of polydipropylene dimethyl ammonium chloride with positive charge on the surface of the glass slide; fourthly, adding sliver nano granules of a pre-aggregation raw material with moderate NaCl into the silver colloid; and finally soaking the glass slide assembled with the positive charge into the pre-aggregation silver colloid solution, and self-assembling and forming a single layer of compact silver granules on the surface of the glass slide to obtain the single-layer silver nanoparticle film with the high surface enhanced Raman scattering activity. The method needs no severe equipment conditions, and has the advantages of safe, simple and convenient operation and economical and easily-obtained raw materials; and the finally prepared single-layer silver nanoparticle film SERS has the advantages of high activity and good repeatability.

Description

technical field [0001] The present invention relates to a method for preparing a self-assembled highly surface-enhanced Raman scattering (SERS) active single-layer silver nanoparticle film, and more generally relates to metallic nanomaterials. Background technique [0002] Surface-enhanced Raman scattering (SERS) is a powerful microanalysis technique with low cost, high resolution, ultrasensitivity, and high structural information. In recent years, the production of SERS substrates has developed from isolated metal nanoparticles to metal nanofilms. This is because the metal colloids tend to aggregate uncontrollably after adding analytes to the metal colloids, making the colloids unstable and resulting in SERS spectra. Reproducibility is poor. In order to avoid changes in various SERS enhancements caused by changes in the degree of colloid aggregation, a more stable SERS substrate is a metal film with controllable size, nanoscale, surface roughness, and surface plasmon excit...

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Problems solved by technology

However, with the increase of operation steps, the total film formation time increases correspondingly, and the cycle of substrate preparation increases.

In addition, the complexity of the process will inevitably increase the risk of preparing highly active SERS films

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