Conical-cylindrical optical fiber SERS (Surface Enhanced Raman Scattering) sensor for detecting trace mercury ions

A mercury ion and sensor technology, applied in the field of heavy metal detection, can solve the problems of long detection period, expensive detection equipment, complicated pretreatment, etc., and achieve high sensitivity and precision, excellent specificity and sensitivity, and high sensitivity

Pending Publication Date: 2022-04-15
CHINA JILIANG UNIV
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Problems solved by technology

These methods often face many shortcomings such as complex preprocessing, long detection cycle, and expensive detection equipment.

Method used

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  • Conical-cylindrical optical fiber SERS (Surface Enhanced Raman Scattering) sensor for detecting trace mercury ions
  • Conical-cylindrical optical fiber SERS (Surface Enhanced Raman Scattering) sensor for detecting trace mercury ions

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Embodiment Construction

[0015] The present invention will be further described in detail below with reference to the accompanying drawings.

[0016] See figure 1 and 2 The cone cylindrical fiber SERS sensor for trace mercury ion detection, including: cone cylindrical fiber detecting end (1), silver nanoparticles (2), CY5 modified single-stranded DNA molecule (3), input / Output multimode fiber (4); silver nanoparticles (2) and a single-stranded single-stranded DNA molecule (3) modified by CY5 is fixed to the surface of cone cylindrical fiber detecting end (1); when mercury ion is present in the solution to be tested, Mercury ions and T (thymine) in DNA molecules form T-Hg 2+ The -t structure enables the CY5 modified single-stranded DNA molecule (3) which is originally stretched in the solution to a hairpin structure, which causes the CY5 signal molecule to the substrate, and the Raman signal excitation light is input. The output multimode fiber (4) is incident to the cone cylindrical fiber detecting end ...

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Abstract

The invention discloses a conical-cylindrical optical fiber SERS (Surface Enhanced Raman Scattering) sensor for detecting trace mercury ions and a preparation method of the conical-cylindrical optical fiber SERS sensor. The SERS sensor is prepared from a conical-cylinder-shaped optical fiber detection end, silver nanoparticles, Cy5-modified single-stranded DNA molecules and input / output multimode optical fibers. The preparation method of the device mainly comprises the following steps: tapering the multimode optical fibers to form a conical-cylinder-shaped structure; cleaning the conical-column-shaped area with a piranha solution and then carrying out optical fiber silanization on the conical-column-shaped area; silver nanoparticles are fixed in the conical-column-shaped area through magnetron sputtering; the single-stranded DNA molecules are self-assembled on the surfaces of the silver nanoparticles, and the SERS sensor is obtained. Raman signal exciting light is incident to the conical-cylinder-shaped optical fiber detection end through the input / output multimode optical fiber, when Hg < 2 + > exists in a solution to be detected, T (thymine) on DNA molecules and Hg < 2 + > form a T-Hg < 2 + >-T structure, and then a hairpin structure is formed, so that signal molecules Cy5 are close to the silver-plated optical fiber substrate to excite Raman signals, and the signals are enhanced by 103-104 times. The scheme is simple in structure, high in sensitivity, good in selectivity and suitable for rapid field detection in various environments.

Description

Technical field [0001] The present invention belongs to the field of heavy metal detection, and more particularly to a surface enhanced Raman sensor for mercury ion detection with a cone cylindrical fiber as a substrate and a preparation method thereof. Background technique [0002] Mercury and its compounds are a kind of volatile pollutant substance, which is enriched in the biological body through the food chain, which is finally enriched in human body and is difficult to discharge, thus causing many diseases, seriously threatening human health, so trace mercury ion It is necessary to detect it. There are already many traditional mercury ion detection methods, including atomic fluorescence spectroscopy, cold atom absorption spectrometry, inductive coupling plasma mass spectrometry and enzyme-linked immunosorbent assay. These methods are often facing many shortcomings with complex pretreatment, long detection cycle, and expensive testing equipment. [0003] In recent years, the ...

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 陈慧芳刘岩栗铭潞
Owner CHINA JILIANG UNIV
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