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Preparation method of surface-enhanced Raman sensor based on metal-organic framework structure

A surface-enhanced Raman and metal-organic technology, applied in Raman scattering, instruments, scientific instruments, etc., can solve the problems such as the inability to effectively improve the Raman spectral signal intensity, the easy oxidation of silver nanoparticles, and the unfavorable low-concentration detection. Good hot spot effect, simple and quick preparation method, and compact arrangement

Active Publication Date: 2022-08-09
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, it is difficult to control the gap between the nanoparticles that constitute the hotspots on the traditional surface-enhanced Raman substrate. When it is used for low-concentration detection of organic dyes in aquaculture and sewage, it cannot effectively improve the signal intensity of the Raman spectrum. Silver nanoparticles are easy to oxidize and cannot It is beneficial for the sensor to be used for low concentration detection of organic dyes in aquaculture and sewage

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  • Preparation method of surface-enhanced Raman sensor based on metal-organic framework structure
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  • Preparation method of surface-enhanced Raman sensor based on metal-organic framework structure

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[0031] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In this example, all chemical reagents are of analytical grade and above. 2-Aminoterephthalic acid, silver nitrate AgNO3, DMF, acetone, isopropanol, ethanol, rhodamine 6G (R6G) were purchased from Sigma Aldrich (Sigma, USA). The deionized water used in the experiment was prepared in real time by the Millipore-Q ultrapure water system (Millipore, USA), and the conductivity was not lower than 18.2 MΩcm.

[0033] Preparation of the sensor

[0034] Step 1, take 169.87mg (1mmol) of silver nitrate and fully dissolve it in 50mL deionized water, take by weighing 181.15mg (1mmol) of 2-aminoterephthalic acid and dissolve it in 5mL DMF, then use a syringe to dissolve 2- The DMF of aminoterephthalic acid was slowly added into deionized water dissolved with silver nitrate, and heated under reflux at 125° C. for 2 hours to obtain a dispersed black-g...

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Abstract

The invention discloses a preparation method of a surface-enhanced Raman sensor based on a metal-organic frame structure. The surface-enhanced Raman sensor is composed of a rod-shaped Ag-in which silver is a metal coordination ion and 2-aminoterephthalic acid is a ligand. The MOF material is prepared. During preparation, the material is uniformly coated on the surface of the substrate. After high-temperature carbonization reduction, the silver ions are reduced to relatively uniform silver particles, and the organic matter is carbonized, thereby removing the functional group in its Raman spectrum. The interference in the low wavenumber band makes the sensor have a good surface-enhanced Raman sensing effect. The sensor of the invention is simple in preparation process and low in cost, takes advantage of the uniform grid structure of MOF material, fixes the distance between silver particles, has good surface-enhanced Raman effect, high sensitivity, and small background interference signal. It can be used for low concentration detection of various organic substances in water.

Description

technical field [0001] The invention relates to the fields of aquaculture and sewage detection, in particular to a preparation method of a surface-enhanced Raman sensor based on a metal-organic frame structure (MOF). Background technique [0002] Methylene blue (MB), malachite green (MG), and crystal violet (CV) are three common organic dyes. They have good fungicidal, bactericidal, and parasitic effects at low doses. They are often used by aquatic products. Improve fish survival in farming and transportation. Among them, malachite green and crystal violet are triphenylmethane organic compounds. According to reports, they have high toxicity, high residues, and three harms. They are listed as banned veterinary drugs for edible animals in my country. The European Union requires them not to be detected. In addition, methylene blue is a phenothiazine organic compound with relatively low toxicity, so it replaces malachite green and crystal violet, but it still has certain toxici...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65G01N21/01
CPCG01N21/658G01N21/01Y02P70/50
Inventor 崔大祥张禹娜崔胜胜金涵薛翠丽
Owner SHANGHAI JIAO TONG UNIV
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