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Silver nanometer square block-sodium polyacrylate composite film as well as preparation method and application thereof

A technology of sodium polyacrylate and composite thin film, which is applied in Raman scattering, material excitation analysis, etc., can solve the problems of unobtainable, irregular product shape, and increase the inconvenience of detection, and achieve high electromagnetic field enhancement, consistency and good repeatability

Active Publication Date: 2015-06-24
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are deficiencies in this preparation method and its products and applications. First, the product has irregular morphology. When it is used as a SERS substrate, sodium chloride needs to be added to constant volume, which increases the inconvenience of detection. Secondly, although the obtained SERS substrate can detect and quantitatively analyze thymine and its structurally similar compounds, it cannot be used to detect other organic pollutants; again, the preparation method cannot obtain SERS for detecting other organic pollutants. base

Method used

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  • Silver nanometer square block-sodium polyacrylate composite film as well as preparation method and application thereof
  • Silver nanometer square block-sodium polyacrylate composite film as well as preparation method and application thereof
  • Silver nanometer square block-sodium polyacrylate composite film as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The concrete steps of preparation are:

[0032] Step 1, firstly prepare silver nitrate pentanediol solution and polyvinylpyrrolidone pentanediol solution with a concentration of 4wt%, respectively; wherein, polyvinylpyrrolidone is polyvinylpyrrolidone K29 with a molecular weight of 58000. Then the sodium chloride ethylene glycol solution with a concentration of 0.8g / L is mixed with the polyvinylpyrrolidone pentanediol solution to obtain a mixed solution; wherein, the mass ratio of the polyvinylpyrrolidone in the mixed solution to sodium chloride is 320: 1.

[0033] Step 2, first inject the silver nitrate pentanediol solution and the mixed solution into the stirred pentanediol precursor solution at a temperature of 140°C at a rate of 600 μL / min and react for 5 hours to obtain a reaction solution; wherein, the reaction solution contains The volume ratio of the silver nitrate pentanediol solution, the mixed solution and the pentanediol precursor is 28:32:48, and the stirr...

Embodiment 2

[0036] The concrete steps of preparation are:

[0037] Step 1, firstly prepare silver nitrate pentanediol solution and polyvinylpyrrolidone pentanediol solution with a concentration of 4.5wt%, respectively; wherein, polyvinylpyrrolidone is polyvinylpyrrolidone K29 with a molecular weight of 58000. Then the sodium chloride ethylene glycol solution with a concentration of 0.9g / L is mixed with the polyvinylpyrrolidone pentanediol solution to obtain a mixed solution; wherein, the mass ratio of the polyvinylpyrrolidone in the mixed solution to sodium chloride is 390: 1.

[0038] Step 2, first inject the silver nitrate pentylene glycol solution and the mixed solution into the stirred pentylene glycol precursor solution at a temperature of 145°C at a rate of 600 μL / min and react for 4.5 hours to obtain a reaction solution; wherein, in the reaction solution The volume ratio of the silver nitrate pentanediol solution, the mixed solution and the pentanediol precursor is 29:31:49, and t...

Embodiment 3

[0041] The concrete steps of preparation are:

[0042] Step 1, firstly prepare silver nitrate pentanediol solution and polyvinylpyrrolidone pentanediol solution with a concentration of 5wt%, respectively; wherein, polyvinylpyrrolidone is polyvinylpyrrolidone K29 with a molecular weight of 58000. Then mix the sodium chloride ethylene glycol solution with a concentration of 1g / L and the polyvinylpyrrolidone pentanediol solution to obtain a mixed solution; wherein, the mass ratio of polyvinylpyrrolidone and sodium chloride in the mixed solution is 460:1 .

[0043] Step 2, first inject the silver nitrate pentanediol solution and the mixed solution into the stirred pentanediol precursor solution at a temperature of 150°C at a rate of 600 μL / min and react for 4 hours to obtain a reaction solution; wherein, the reaction solution contains The volume ratio of the silver nitrate pentanediol solution, the mixed solution and the pentanediol precursor is 30:30:50, and the stirring speed o...

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Abstract

The invention discloses a silver nanometer square block-sodium polyacrylate composite film as well as a preparation method and an application thereof. The film is a composite film which is coated on a substrate, has the thickness of 100-360nm and is composed of a silver nanometer square block coated with sodium polyacrylate and the sodium polyacrylate, wherein the side length of the silver nanometer square block is 60-100nm; and the thickness of the sodium polyacrylate is 40-60nm. The method comprises the following steps of: firstly respectively preparing a silver nitrate pentanediol solution and a polyvinylpyrrolidone pentanediol solution, mixing a sodium chloride glycol solution and the polyvinylpyrrolidone pentanediol solution so as to obtain a mixed solution, and injecting the silver nitrate pentanediol solution and the mixed solution in a pentanediol precursor solution so as to obtain a reaction solution; and then, diluting the reaction solution, carrying out solid-liquid separation to obtain the silver nanometer square block, mixing the silver nanometer square block and an ethanol solvent or N, N-dimethyl formamide, mixing with a sodium polyacrylate water solution so as to obtain a mixed solution through in an ultrasound manner, dripping the mixed solution on the substrate, and carrying out air drying, so as to obtain a target product. The silver nanometer square block-sodium polyacrylate composite film is utilized as a base to measure various organic substances.

Description

technical field [0001] The invention relates to a composite film and its preparation method and application, in particular to a silver nano-square-sodium polyacrylate composite film and its preparation method and application. Background technique [0002] Ultra-sensitive surface-enhanced Raman scattering (SERS) detection requires substrates with high SERS activity and effective adsorption of detection molecules. At present, the most widely used and effective SERS substrate is based on aggregates of gold / silver nanoparticles with arbitrary shapes, such as "a surface Preparation method of enhanced Raman scattering substrate". The preparation method mentioned in this specification is to use silver nitrate, sodium citrate and sodium polyacrylate as raw materials, and use liquid phase chemistry to obtain a surface-enhanced Raman scattering substrate that can stabilize the detection signal; it is used for thymine and Detection and quantitative analysis of its structurally simila...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/20B32B27/30C08L33/02C08K7/00C08K3/08B22F9/24G01N21/65
Inventor 黄竹林孟国文钱益武
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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