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Preparation method of SERS substrate, SERS substrate, and application of SERS substrate

A substrate and nanomaterial technology, applied in measurement devices, instruments, material analysis by optical means, etc., can solve the problems of difficulty in synthesis and performance optimization, inability to control the microscopic morphology of metal ions, and low detection sensitivity. The effect of stable Mann signal value, low detection limit and high sensitivity

Pending Publication Date: 2021-05-14
CHINESE ACAD OF INSPECTION & QUARANTINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the synthesis and performance optimization of MOFs materials used in the prior art are difficult, and the microscopic morphology of metal ions cannot be controlled, and at the same time, the detection sensitivity is not high when using MOFs materials as SERS substrate materials; in order to achieve optimization as SERS substrate materials Synthetic process and corresponding performance of the MOFs material, reduce the detection limit in the SERS process, the invention provides a kind of preparation method based on AgNPs / MIL-101 (Fe) nano material SERS substrate;

Method used

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  • Preparation method of SERS substrate, SERS substrate, and application of SERS substrate
  • Preparation method of SERS substrate, SERS substrate, and application of SERS substrate
  • Preparation method of SERS substrate, SERS substrate, and application of SERS substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A SERS substrate based on AgNPs / MIL-101 (Fe) nanomaterials, the SERS substrate is AgNPs / MIL-101 (Fe) nanomaterials, and the AgNPs / MIL-101 (Fe) nanomaterials are specifically prepared by the following method:

[0057] The specific preparation method of AgNPs material is as follows: preparation of AgNO 3 Concentration of 18mg / mL 100mL solution, stirring while heating, wait until the AgNO 3 When the solution was boiling, 4 mL of trisodium citrate solution with a mass fraction of 1% was added immediately and the stirring was accelerated, and the heating was continued at this temperature for 40 minutes, and finally cooled to room temperature to prepare the AgNPs glue, which was then stored in the dark at 4°C for later use.

[0058] The specific preparation process of MIL-101 (Fe) material is as follows: Weigh 0.675gFeCl 3 ·6H 2 O and 0.206g of terephthalic acid in 15mL of DMF, and accelerate the dissolution on a high-speed vortex to form a clear transparent yellow solution...

Embodiment 2

[0061] In Example 2, except for the preparation of AgNPs / MIL-101(Fe) nanomaterials, the volume ratio of MIL-101(Fe) dispersion to AgNPs glue was 1:2, other process steps and parameters were the same as in Example 1 same.

Embodiment 3

[0063] In Example 3, except for the preparation of AgNPs / MIL-101(Fe) nanomaterials, the volume ratio of MIL-101(Fe) dispersion to AgNPs glue was 1:3, other process steps and parameters were the same as in Example 1 same.

[0064] Effect representation

[0065] 1. Characterization of AgNPs / MIL-101(Fe) nanomaterials:

[0066] The XRD spectrogram of the synthesized MIL-101 (Fe) nano material, AgNPs material and the final synthetic AgNPs / MIL-101 (Fe) nano material in the present invention is as follows figure 1 As shown, the main diffraction peaks of MIL-101(Fe) at low angles are consistent with published literature, confirming the integrity of MIL-101(Fe) structure, which is consistent with relevant literature reports; Ag nanoparticles and MIL-101(Fe ) crystal plane diffraction peaks of Ag appeared after compounding, which is consistent with the relevant literature reports, and the diffraction peaks of MIL-101 did not change before and after, which shows that as the support of ...

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Abstract

The invention belongs to the technical field of Raman spectrum detection. The invention discloses an SERS substrate. The SERS substrate comprises an AgNPs / MIL-101 (Fe) nano material, and the AgNPs / MIL-101 (Fe) nano material is prepared from an AgNPs material and an MIL-101 (Fe) material by a physical self-assembly method. The invention further discloses a Raman spectrum detection method based on the AgNPs / MIL-101 (Fe) nano material SERS substrate and application of the Raman spectrum detection method to detection of the content of paraquat in a sample to be detected. The Raman spectrum detection method based on the AgNPs / MIL-101 (Fe) nano material SERS substrate has high sensitivity and lower detection limit, rhodamine 6G is detected, the EF value of 10<-6 > mol / L R6G is calculated to be 2.09 * 10<9>, and the Raman attribution peak intensity RSD of R6G is researched and calculated to be 7.55%; and when the paraquat is detected, the lowest detection concentration is 10<-12 > mol / L, 10<-6 > mol / L paraquat and the substrate are combined in different pH values for Raman signal detection comparison, the Raman signal value is relatively stable, and paraquat detection can be carried out in the environment with the pH value of 3-11.

Description

technical field [0001] The invention belongs to the technical field of Raman spectrum detection, and in particular relates to a preparation method of a SERS substrate based on AgNPs / MIL-101 (Fe) nanometer material, a SERS substrate and an application thereof. Background technique [0002] Surface-enhanced Raman scattering (SERS) is a technique developed on the basis of ordinary Raman scattering. As we all know, surface-enhanced Raman spectroscopy (SERS) is a rapid non-destructive detection spectroscopy technology, which has the characteristics of high sensitivity, high accuracy, fingerprint spectrum and no interference of water molecules, and can realize the detection of single molecules. With the rapid development of laser technology and the increasing maturity of nanomaterial preparation technology, SERS not only plays an important role in the scientific research of molecular adsorption on the surface of single crystals, chemical reaction mechanism and cell behavior in org...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 邹明强郑杰爽齐小花张晓华
Owner CHINESE ACAD OF INSPECTION & QUARANTINE
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