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

Abstract

The invention discloses a preparation method of a surface-enhanced Raman sensor based on a metal organic framework structure. The surface-enhanced Raman sensor is prepared from a rod-like Ag-MOF material with silver as a metal coordination ion and 2-aminoterephthalic acid as a ligand. During preparation, the material is uniformly coated on the surface of a substrate, silver ions are reduced into relatively uniform silver elementary substance particles through high-temperature carbonization reduction, and organic matters are carbonized, so that interference of functional groups in a Raman spectrum of the surface-enhanced Raman sensor in a low-wave-number section is removed, and the surface-enhanced Raman sensor has a good surface-enhanced Raman sensing effect. The preparation process of the sensor is simple, the cost is low, the advantage of a uniform grid structure of the MOF material is exerted, the distance between silver particles is fixed, and the sensor has a good surface enhanced Raman effect, high sensitivity and small background interference signals and can be used for low-concentration detection of various organic matters in water.

Description

technical field [0001] The invention relates to the fields of aquaculture and sewage detection, in particular to a method for preparing a surface-enhanced Raman sensor based on a metal organic framework (MOF). Background technique [0002] Methylene blue (MB), malachite green (MG), and crystal violet (CV) are three common organic dyes, which have good fungicidal, bactericidal, and parasitic effects at low doses, and are often used in aquatic products. Improve fish survival rate in farming and transportation. Among them, malachite green and crystal violet are triphenylmethane organic compounds. According to reports, they have high toxicity, high residue, and three hazards. In addition, methylene blue is a phenothiazine organic compound with relatively low toxicity, so it has replaced malachite green and crystal violet, but it still has certain toxicity and teratogenicity, and is banned from aquaculture in some countries. [0003] Traditional detection methods include spectr...

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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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