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Preparation method of hydrophobic paper surface enhanced Raman substrate

A surface-enhanced Raman and hydrophobic technology, applied in the field of analysis and detection, can solve the problems of high cost, cumbersome process, and long time consumption, and achieve the effect of maintaining stability, good repeatability, and simplifying the reaction process

Inactive Publication Date: 2019-08-30
QILU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods for hydrophobic modification of SERS substrates are cumbersome, time-consuming and expensive, and the hydrophobic molecular structure is difficult to form effective chemical bonds with paper SERS substrates. The hydrophobic stability of SERS substrates needs to be further improved. Also not suitable for the construction of highly sensitive SERS substrates

Method used

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  • Preparation method of hydrophobic paper surface enhanced Raman substrate
  • Preparation method of hydrophobic paper surface enhanced Raman substrate
  • Preparation method of hydrophobic paper surface enhanced Raman substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1, Preparation of Hydrophobic Paper Surface Enhanced Raman Substrate

[0050] (1) Preparation of paper SERS substrate

[0051] Cut the filter paper into small pieces of 2cm×2cm, put it in 100mL Tris-HCl buffer solution with pH=8.5, then add DA to the above buffer solution, control the concentration of DA to 2mg·mL –1 , Stir the reaction at room temperature for 24h, and then take out the DA-modified filter paper, wash it with distilled water and ethanol several times, and then use it for later use. AgNO 3 Add to 100mL secondary water to control AgNO 3 The concentration is 2mg·mL –1 , add the prepared DA-modified filter paper to the above solution, stir at room temperature for 24h, utilize the reducibility of the phenolic hydroxyl group in the PDA molecule to remove Ag + In situ reduction, AgNPs were grown on the surface of the paper substrate, washed with distilled water, and the product was dried in vacuum before use.

[0052] (2) Synthesis of long-chain al...

Embodiment 2

[0064] As described in Example 1, the difference is: the concentration of DA in the solution in step (1) is 4mg·mL –1 , AgNO 3 The concentration is 4mg·mL –1 .

Embodiment 3

[0066] As described in Example 1, the difference is: the concentration of DA in the solution in step (1) is 8mg·mL –1 , AgNO 3 The concentration is 8mg·mL –1 .

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Abstract

The invention relates to a preparation method of a hydrophobic paper surface enhanced Raman substrate. The method comprises the following steps: providing a paper substrate, and covering a metal nanolayer on the paper substrate to obtain a paper surface enhanced Raman substrate; and modifying N,N-long-chain alkyl diazomethane to the surface of the paper surface enhanced Raman substrate through achemical bond to obtain a hydrophobic SERS substrate. According to the preparation method, the paper substrate is used as a framework, the PDA is formed on the surface of the paper substrate by utilizing in-situ polymerization of DA, and then metal particles are reduced and grown to form a nano structure by utilizing the reducibility of phenolic hydroxyl in PDA molecules, so that a paper SERS substrate is prepared. Due to the adhesion of the PDA, the paper substrate and the metal nano particles can be tightly bridged together, and the stability of the SERS substrate is maintained; and meanwhile, the metal nano particles on the paper substrate are formed by in-situ reduction, the metal nanostructures are uniformly distributed, the SERS substrate with good repeatability can be obtained, andthe obtained Raman signal has strong repeatability.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to a method for preparing a highly sensitive surface-enhanced Raman scattering hydrophobic substrate. Background technique [0002] Surface-enhanced Raman scattering (SERS) obtains a signal that is stronger than ordinary Raman scattering by adsorbing molecules on the surface of rough metal or metal sol particles. It is an analytical testing technique that does not require labeling of the detection substance and has high sensitivity. , high accuracy and non-destructive testing and other outstanding advantages, it has shown great application potential in the fields of biomedicine, chemical materials and food testing. Due to the characteristics of paper substrates such as easy sample sampling, portability, biodegradability, environmental friendliness, and low cost, more and more researchers have constructed various noble metal nanoparticles on the surface of ...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 张志良杨鹏飞刘俊张灵子
Owner QILU UNIV OF TECH
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