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Surface enhanced Raman spectrum substrate for specifically detecting Cu2+, preparation method thereof and application thereof

A surface-enhanced Raman and species-specific technology, which is applied in the field of surface-enhanced Raman spectroscopy substrates for specific identification of Cu2+ and its preparation, can solve the problems of high cost, manpower and material resources consumption, long detection cycle, etc. Good stability and high sensitivity

Inactive Publication Date: 2019-12-03
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, a variety of methods are emerging, such as chromatography, atomic absorption spectrometry, electrochemistry, fluorescence, colorimetry, etc. These methods have a long detection cycle, resulting in high cost of manpower and material resources, so they need to be used at low cost, high sensitivity, and easy to operate. A Simple Method to Realize the Detection of Divalent Copper Ions
[0004] The key to the specific detection of metal ions by surface-enhanced Raman scattering spectroscopy (SERS) lies in the preparation of the substrate. In the detection of Raman spectroscopy, the problem of poor stability of metal nanomaterials often exists.

Method used

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  • Surface enhanced Raman spectrum substrate for specifically detecting Cu2+, preparation method thereof and application thereof
  • Surface enhanced Raman spectrum substrate for specifically detecting Cu2+, preparation method thereof and application thereof
  • Surface enhanced Raman spectrum substrate for specifically detecting Cu2+, preparation method thereof and application thereof

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Embodiment 1

[0043] (1) Specific detection of Cu 2+ Preparation of Surface-Enhanced Raman Spectroscopy Substrate 4-MBA-AgNPs

[0044] Preparation method: under 700r / min magnetic stirring, 0.010g NaBH 4 Add to 100ml 10 -4 M AgNO 3 In the solution, a bright yellow solution was obtained, and after stirring for 5 min, the pH of the solution was adjusted to 7.4-8.0 with 0.1 M HCl. Then add 0.2ml 10 to the prepared AgNPs -3 M of 4-MBA solution, stirred for about 1 h to ensure that 4-MBA self-assembled on the surface of AgNPs. The above steps were carried out in an ice bath. After the reaction, the ice tank was removed to allow the solution to reach room temperature.

[0045] (2) Surface-enhanced Raman spectroscopy substrate 4-MBA-AgNPs on Cu 2+ the response to

[0046] Method: Add 5 mL of prepared 4-MBA-AgNPs into 15 mL centrifuge tubes, and then add 50 μL of them with a concentration range of 1.0×10 -8 mol / L-1.0×10 -3 mol / L Cu 2+ The solution was diluted to 10 mL by adding three times o...

Embodiment 2

[0060] Quantitative detection of Cu by surface-enhanced Raman spectroscopy based on 4-MBA-AgNPs 2+

[0061] (1) Standard curve drawing

[0062] Method: In a 250mL round flask, under 700r / min magnetic stirring, 0.010g NaBH 4 Add to 100ml10 -4 M AgNO 3 solution, a bright yellow solution was obtained, and after continuing to stir for 5min, the pH of the solution was adjusted to 7.4-8.0 with 0.1M HCl, and then 0.2ml of 10 -3 M of 4-MBA solution, stirred for about 1 h to ensure that 4-MBA self-assembled on the surface of AgNPs. The above steps were all carried out in an ice bath. After the reaction, the ice tank was removed to allow the solution to reach room temperature.

[0063] In 15mL centrifuge tubes, add 5mL of prepared 4-MBA-AgNPs, and then add 50μL of different concentrations of Cu 2+ Standard solution, add distilled water to make up to 10mL, mix evenly, make a series of standard concentrations 1×10 -8 mol / L-1×10 -3 mol / L Cu 2+ The solution was added to the 4-MBA-A...

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Abstract

The invention relates to the technical field of surface enhanced Raman spectra and particularly relates to a surface enhanced Raman spectrum substrate for specifically detecting Cu2+, a preparation method thereof and application thereof. The preparation method comprises a step of adding NaBH4 into an AgNO3 solution to obtain a faint yellow solution under magnetic stirring, continuously stirring for 5 minutes, and adjusting the pH value of the solution to obtain an AgNPs solution, and a step of adding the obtained AgNPs solution into a 4-mercaptobenzoic acid solution, stirring, removing ice-water bath after reaction is finished, and restoring to room temperature to obtain a target product. A 4-mercaptobenzoic acid modified silver nanoparticle substrate material designed and synthesized in the invention has the advantages of good stability and high sensitivity, and the problem of poor stability of a metal nano-material is solved to a certain extent.

Description

technical field [0001] The invention relates to the technical field of surface-enhanced Raman spectroscopy, in particular to a method for specifically identifying Cu 2+ Surface-enhanced Raman spectroscopy (SERS) substrates and their preparation methods and applications. Background technique [0002] Surface-enhanced Raman scattering spectroscopy (SERS) is a surface analysis technique based on the detection of molecular vibrations. By analyzing the vibrations of substances adsorbed in a metal substrate, information such as the structure of the adsorbed substances is obtained, and then the type of the substance is determined. By adsorbing the detection molecules to suitable metal nanoparticles, the electromagnetic field effect of the metal nanoparticles is used to amplify and analyze the vibration information to obtain more accurate spectral signals. The high sensitivity of surface-enhanced Raman scattering spectroscopy technology enables the technology to detect single-molec...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00G01N21/658
Inventor 张谦曹雪张玲夏立新孙谦康博淳
Owner LIAONING UNIVERSITY
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