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Surface-reinforced Raman scatting substrate and preparation method and application thereof

A surface-enhanced Raman and substrate technology, applied in Raman scattering, liquid chemical plating, coating, etc., can solve the problems of weak Raman enhancement effect, complicated substrate preparation methods, and unsuitability for large-scale industrial production. Excellent chemical activity, good application prospects, and the effect of promoting electron transport

Inactive Publication Date: 2020-10-30
UNIVERSITY OF MACAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with MoS 2 As an example, its own Raman enhancement effect is weak, and the detection limit is usually 10 -3 M, with precious metals (10 -10 M) has no practical application value compared to
Currently only limited MS 2 substrate, and most of the substrate preparation methods are complicated and only suitable for small-scale preparation in the laboratory, not suitable for large-scale industrial production

Method used

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  • Surface-reinforced Raman scatting substrate and preparation method and application thereof
  • Surface-reinforced Raman scatting substrate and preparation method and application thereof
  • Surface-reinforced Raman scatting substrate and preparation method and application thereof

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[0036] In the second aspect, the present invention also provides a method for preparing the surface-enhanced Raman scattering substrate, comprising: immersing metal foil in a precursor solution of a sulfur-containing compound, and preparing the surface-enhanced Raman scattering substrate by a hydrothermal method.

[0037] In an optional embodiment, the temperature of the hydrothermal reaction is 180-220° C., and the time is 20-24 hours, preferably a constant temperature reaction at 180° C. for 24 hours.

[0038] The embodiment of the present invention provides a preparation method of the above-mentioned surface-enhanced Raman scattering substrate, which is the first time to grow ultra-thin MS on a metal foil on a large scale through hydrothermal reaction. 2 The nanosheet array material, its edges are all exposed on the material surface, indicating that the nanosheets grow in the vertical direction. Since the temperature and time of the hydrothermal reaction determine the shape an...

Embodiment 1

[0053] A method for preparing a surface-enhanced Raman scattering substrate, comprising the following steps:

[0054] (1) Weigh thiourea (3 g) and dissolve it in 80 mL of deionized water, and stir at room temperature for 1 hour.

[0055] (2) Treat molybdenum foil (size 30*40*0.5mm) with 6M dilute hydrochloric acid for ten minutes, then clean it, ultrasonicate it with acetone for half an hour, then ultrasonicate it with ethanol for half an hour, and then ultrasonicate it with deionized water for half an hour , placed in a vacuum oven at 60°C and dried for later use.

[0056] (3) Put the solution in step (1) and the molybdenum foil treated in step (2) into a 100mL hydrothermal reaction kettle, tighten it, and put it in an oven at 180°C for 24 hours.

[0057] (4) After the reaction is over, MoS grown on molybdenum foil is obtained 2 , washed several times with deionized water and ethanol.

[0058] (5) Dry in a vacuum oven at 60°C for 12 hours.

Embodiment 2

[0060] A method for preparing a surface-enhanced Raman scattering substrate, comprising the following steps:

[0061] (1) Weigh thiourea (3 g) and dissolve it in 80 mL of deionized water, and stir at room temperature for 1 hour.

[0062] (2) Treat the tungsten foil (size 30*40*0.5mm) with 6M dilute hydrochloric acid for ten minutes, then clean it, ultrasonicate it with acetone for half an hour, then ultrasonicate it with ethanol for half an hour, and then ultrasonicate it with deionized water for half an hour , placed in a vacuum oven at 60°C and dried for later use.

[0063] (3) Put the solution in step (1) and the tungsten foil treated in step (2) into a 100mL hydrothermal reaction kettle, tighten it, and put it in an oven at 180°C for 24 hours.

[0064] (4), after the reaction is over, the WS grown on the tungsten foil is obtained 2 , washed several times with deionized water and ethanol.

[0065] (5) Dry in a vacuum oven at 60°C for 12 hours.

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Abstract

The invention discloses a surface-reinforced Raman scatting substrate and a preparation method and application thereof. An ultrathin MS2 nanosheet array material arranged vertically grows on metal foil on a large scale through a hydrothermal reaction for the first time, the edges of nanosheets are exposed to the surface of the metal foil material, and it shows that the nanosheets grow in the vertical direction and have excellent activity and good stability. Dye molecules rhodamine 6G(R6G) common in the industry is taken as an example, the detecting limit of the substrate reaches 5*10-8M, the detectability of the substrate at low concentration is successfully verified, and the substrate is expected to be widely applied to large-scale environment and hygiene monitoring.

Description

technical field [0001] The invention relates to the technical field of Raman detection, in particular to a surface-enhanced Raman scattering substrate and a preparation method and application thereof. Background technique [0002] Raman spectroscopy is a fast, non-destructive characterization method that incorporates the fingerprint vibrational information of a sample, providing high spectral and spatial resolution for structural and electronic information. Therefore, Raman spectroscopy can be used to determine the chemical composition of samples, molecular structure, conformation, and interactions between molecules. However, the Raman scattering area of ​​most molecules is very small, and the intensity of Raman light is only 10 times that of the incident light intensity. -9 , the sensitivity of Raman scattering is low. In 1974, Fleischmann et al. obtained the Raman signal of high-quality pyridine molecules for the first time on a rough silver electrode. In 1977, VanDuyne...

Claims

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Application Information

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IPC IPC(8): C23C18/12G01N21/65
CPCC23C18/1204G01N21/658
Inventor 潘晖陈明鹏周冰朴
Owner UNIVERSITY OF MACAU