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A highly sensitive surface-enhanced Raman detection substrate for trace organic residues and its preparation and use methods

A surface-enhanced Raman and organic technology, applied in the fields of environmental protection and spectroscopy, can solve the problems of limiting the application of SERS technology, difficult to recycle, complex synthesis process, etc., to achieve good portability, lower average cost, flexible and simple operation. Effect

Inactive Publication Date: 2019-01-11
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing substrate materials with obvious SERS enhancement effect are mainly discrete noble metal (gold, silver, etc.) micro-nano particles
These granular material substrates have disadvantages and deficiencies such as complex synthesis process, inconvenient use, unstable performance, etc.
In particular, existing reinforcement base materials are difficult to recycle, making their utilization cost prohibitive
Therefore, the imperfection of the Raman-enhanced substrate limits the application of SERS technology in the detection of trace organic pollutants.

Method used

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  • A highly sensitive surface-enhanced Raman detection substrate for trace organic residues and its preparation and use methods
  • A highly sensitive surface-enhanced Raman detection substrate for trace organic residues and its preparation and use methods
  • A highly sensitive surface-enhanced Raman detection substrate for trace organic residues and its preparation and use methods

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] Take polycrystalline tungsten (manufactured by Xiamen Honglu Tungsten Molybdenum Technology Co., Ltd.) with a purity of 99.99wt% and a body-centered cubic (bcc) crystal structure. The size is 1cm*1cm*0.3cm, and the surface is smooth and flat by mechanical polishing; The bulk polycrystalline tungsten polished in the above steps is irradiated by a high-power plasma material irradiation experimental device. The plasma used is helium ion plasma, the ion energy is about 200Ev, and the ion current intensity is about 1.0x10 22 ions / m 2 ·s 1 , the irradiation temperature is about 1300°C, and the irradiation time is about 80 minutes. After that, a material with a nano-array morphology is formed, that is, the nano-wires grow approximately perpendicular to the planar substrate, the diameter is uniform, about 50nm, and the average spacing of the nano-wires is about 100nm, so that the bulk metal tungsten becomes a vertical array of tungsten nano-wires; On the vertically arrayed tu...

example 2

[0036] Take polycrystalline tungsten (manufactured by Xiamen Honglu Tungsten Molybdenum Technology Co., Ltd.) with a purity of 99.99wt% and a body-centered cubic (bcc) crystal structure. The size is 1cm*1cm*0.3cm, and the surface is smooth and flat by mechanical polishing; The bulk polycrystalline tungsten polished in the above steps is irradiated by a high-power plasma material irradiation experimental device. The plasma used is helium ion plasma, the ion energy is about 200Ev, and the ion current intensity is about 1.0x10 22 ions / m 2 ·s 1 , the irradiation temperature is about 1300°C, and the irradiation time is about 80 minutes. After that, a material with a nano-array morphology is formed, that is, the nano-wires grow approximately perpendicular to the planar substrate, the diameter is uniform, about 50nm, and the average spacing of the nano-wires is about 100nm, so that the bulk metal tungsten becomes a vertical array of tungsten nano-wires; Through the Lab18 magnetron ...

example 3

[0038] The gold-plated tungsten nanowire array obtained in Example 1 was selected as the substrate, soaked in alcohol for 1 hour, and then dried naturally for later use. Soak it in an aqueous rhodamine B solution with a concentration ranging from 10ppm to 10ppb, and let it stand at room temperature for 1 minute. The substrate soaked in the solution was taken out with tweezers, and dried naturally on filter paper for 10 minutes. After the substrate was dried, a 532nm laser was selected as the excitation light source, and a Renishaw inVia micro-Raman spectrometer was used to detect the dye molecules adsorbed on the surface of the substrate by Raman scattering at room temperature. image 3 The Raman spectrum curve shown can be compared with the Raman library to determine the composition of the sample.

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Abstract

A trace organic residue high sensitivity surface-enhanced raman detecting substrate is perpendicular array-shaped tungsten nano wires coated with nano noble metal thin films. A preparation method of the substrate mainly comprises the steps that the polished surface of block-shaped polycrystal tungsten is irradiated through a high-power plasma material radiation experimental device, so that the block-shaped metal tungsten becomes the perpendicular array-shaped tungsten nano wires; and then the tungsten nano wires are coated with the noble metal thin films. The substrate is good in portability and can be used as an integrated device, operation is flexible and easy, and working efficiency is high; the material can be reused, so that the average cost of the device is lowered greatly; multiple kinds of organics can be detected and identified by using the substrate material, and the raman-enhanced effect is obviously; and the preparation method is convenient and simple, and the complex process of nano particle synthesis is avoided.

Description

technical field [0001] The invention relates to the technical fields of environmental protection and spectroscopy, in particular to a substrate for qualitative detection of trace organic residues and a preparation and use method. Background technique [0002] The development and application of organic matter represented by dyes has brought rich and colorful enjoyment to human beings, and at the same time caused serious pollution to the living environment of human beings, seriously threatening human health. Exploring methods for effective detection and identification of organic residues has become an urgent task, especially for the detection and identification of trace organic substances has become a technical problem. Surface-enhanced Raman spectroscopy (SERS) technology has been proved to be of good significance in the detection of organic matter in the past. However, the existing substrate materials with obvious SERS enhancement effect are mainly discrete noble metal (gol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/16C23C14/32G01N21/65
CPCC23C14/16C23C14/165C23C14/325G01N21/658
Inventor 刘德弟刘东平刘璐
Owner DALIAN NATIONALITIES UNIVERSITY
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