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

A technology of enhanced Raman scattering and silver nanoparticles, applied in the field of metal nanomaterials, can solve the problems of increasing the risk of high-activity SERS films, increasing the substrate preparation cycle, and increasing the film-forming time, achieving low cost, simple design, The effect of simple method

Inactive Publication Date: 2009-07-29
SOUTHEAST UNIV
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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

Method used

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

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Embodiment Construction

[0024] The present invention utilizes silver colloid as a raw material, first carefully cleans the glass slide as a solid carrier, then self-assembles a monolayer of poly(diallyldimethylammonium chloride), PDDA on the surface of the glass slide, and then passes Add NaCl to the silver colloid to moderately pre-aggregate raw silver nanoparticles, and finally immerse the glass slide assembled with PDDA in the above-mentioned pre-aggregated silver colloid solution, and finally self-assemble on the surface of the glass slide to form a single layer of dense silver particles, once A single-layer silver nanoparticle film with high SERS activity was successfully prepared.

[0025] The preparation method of the silver colloid solution adopts the method for preparing silver colloid by reducing silver nitrate with sodium citrate described by Lee and Meisel in J.Phys.Chem.1982,86,3391-3395.

[0026] The slides are economical and easy to obtain.

[0027] The aggregating agent NaCl has good...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/38
Inventor 宋春元
Owner SOUTHEAST UNIV
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