Construction of multi-layer structure surface enhanced Raman base and accurate regulation and control for performance of construction

A surface-enhanced Raman and multi-layer structure technology, applied in Raman scattering, measuring devices, instruments, etc., can solve the problems affecting the spectral stability, uniformity and repeatability of adsorbed molecules, and difficult control of surface roughness. The effect of spatially resolved Raman map with uniform color, excellent stability, and enhanced effect

Inactive Publication Date: 2018-06-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many traditional SERS active substrates commonly used at present, such as: electrochemically roughened noble metal active electrode substrates, noble metal sol active substrates, vacuum-evaporated noble metal island film active substrates, and chemically etched and chemically deposited noble metal active substrates. However, these self-assembled Reactive substrates provide difficult-to-control surface roughness, which affects the stability, uniformity, and reproducibility of spectra of adsorbed molecules

Method used

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  • Construction of multi-layer structure surface enhanced Raman base and accurate regulation and control for performance of construction
  • Construction of multi-layer structure surface enhanced Raman base and accurate regulation and control for performance of construction
  • Construction of multi-layer structure surface enhanced Raman base and accurate regulation and control for performance of construction

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Effect test

Embodiment 1

[0032] The construction of a multilayer structure surface-enhanced Raman substrate and the precise regulation of its performance include the following steps:

[0033] (1) Selection of the substrate: select the copper sheet metal layer as the reaction substrate;

[0034] (2) Construction of the double-layer nanostructure: the reaction substrate is reacted in silver nitrate and potassium hydrogen phthalate using the principle of displacement reaction, and the molar ratio of silver nitrate and potassium hydrogen phthalate is controlled to be 3:1, 8min Finally, a double-layer nanostructure composed of dendrites and silver nanoparticles is obtained;

[0035] (3) Pretreatment of the double-layer nanostructure: the double-layer nanostructure is acid-washed with dilute sulfuric acid and then alkali-washed with sodium hydroxide, rinsed and then washed with deionized water and dried;

[0036] (4) Construction of the Raman substrate: Electroplating is performed on the surface of the dou...

Embodiment 2

[0039] The construction of a multilayer structure surface-enhanced Raman substrate and the precise regulation of its performance include the following steps:

[0040] (1) Selection of the substrate: select the iron sheet metal layer as the reaction substrate;

[0041] (2) Construction of double-layer nanostructures: The reaction substrate was reacted in silver nitrate and polyvinylpyrrolidone using the principle of displacement reaction, and the molar ratio of silver nitrate and polyvinylpyrrolidone was controlled to be 6:1. After 20 minutes, a dendritic and Double-layer nanostructure composed of silver nanoparticles;

[0042] (3) Pretreatment of the double-layer nanostructure: the double-layer nanostructure is acid-washed with dilute sulfuric acid and then alkali-washed with sodium hydroxide, rinsed and then washed with deionized water and dried;

[0043] (4) Construction of the Raman substrate: the surface of the double-layer nanostructure is spin-coated, and the Raman subs...

Embodiment 3

[0046] The construction of a multilayer structure surface-enhanced Raman substrate and the precise regulation of its performance include the following steps:

[0047] (1) Selection of the substrate: select the iron sheet metal layer as the reaction substrate;

[0048] (2) Construction of double-layer nanostructures: The reaction substrate is reacted in silver nitrate and polyvinylpyrrolidone by using the principle of displacement reaction, and the molar ratio of silver nitrate and polyvinylpyrrolidone is controlled to be 20:1. Double-layer nanostructure composed of silver nanoparticles;

[0049] (3) Pretreatment of the double-layer nanostructure: the double-layer nanostructure is acid-washed with dilute sulfuric acid and then alkali-washed with sodium hydroxide, rinsed and then washed with deionized water and dried;

[0050] (4) Construction of the Raman substrate: the surface of the double-layer nanostructure is spin-coated, and the Raman substrate can be obtained after 10 m...

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Abstract

The invention provides construction of a multi-layer structure surface enhanced Raman base and accurate regulation and control for performance of the construction, relating to the technical field of Raman detection. The construction comprises four steps of selecting a base, constructing a dual-layer nano-structure, pre-treating the dual-layer nano-structure and constructing a Raman base; a traditional single-layer structure can be transformed into a dual-layer structure through a simple replacement reaction, the enhancing factor of Raman is increased by 1.5 times; by electroplating or spinninggraphene, the Raman enhancing performance is further improved due to the graphene layer, which is 1.48 times that of the dual-layer structure, and the long-term stability of the base can be further improved. The multi-layer structure surface enhanced Raman base can be used for improving the limiting concentration of a traditional Raman base for detecting probe molecules and further improving enhancing factors of the traditional Raman base, and is low in cost and simple to operate; and the preparation process realizes rapid reaction without large reaction equipment, and accords with environment-friendly chemical concept.

Description

technical field [0001] The invention relates to the technical field of Raman detection, in particular to the construction of a surface-enhanced Raman substrate with a multilayer structure and the precise regulation of its performance. Background technique [0002] Surface-enhanced Raman scattering has attracted widespread attention since it was discovered in 1974, because of its high sensitivity, it can detect monolayer and submonolayer molecules adsorbed on the metal surface, and can give Structural information of surface molecules is considered to be a very effective tool for probing interface properties and intermolecular interactions, and characterizing surface molecular adsorption behavior and molecular structure. [0003] Surface-enhanced Raman scattering has the characteristics of high sensitivity, low detection limit and fingerprint spectrum, so it is widely used in the detection of pesticides, antibiotics, additives and other chemical substances. Although Raman spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65B82Y40/00
CPCB82Y40/00G01N21/658
Inventor 张茂峰刘宏辉郑致远
Owner HEFEI UNIV OF TECH
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