SERS-based portable single-wavelength Raman photometer

A single-wavelength, photometric technology, used in Raman scattering, material analysis by optical means, material excitation analysis, etc., can solve the problems of unassisted SERS sensing analysis efficiency, increased difficulty in instrument miniaturization, and prolonged testing time. , to achieve the effect of improving detection efficiency, flexible and diverse data recording formats, and reducing test costs

Inactive Publication Date: 2019-04-09
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Complete spectral information not only does not help to improve the performance of SERS sensing analysis, but also makes it more difficult to miniaturize the instrument and prolongs the test time
In addition, although portable or hand-held Raman spectrometers on the market can meet the requirements for miniaturization of analytical instruments in the field of rapid on-site inspection, they still collect full-spectrum information, and in order to achieve a high degree of device integration, the cost has been constantly increasing. stay high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 uses a fiber laser with a center wavelength of 785 nm as the light source. Since the laser light emitted by the fiber probe has a large divergence angle, the present invention uses a collimator to make the beam close to a parallel beam; further, in the collimator A Galileo beam expander is introduced in the downstream optical path. In addition to further optimizing the divergence angle of the laser beam, it also expands the beam diameter so that a larger numerical aperture can be obtained during the focusing process of the sample. After the above “shaping”, the laser beam is reflected by the dichroic mirror at an angle of 90° and focused to the center of the sample cell by the lens; the SERS signal is collected by the same lens and passes through the dichroic mirror used to filter Rayleigh scattering , Through the pinhole used to shield the stray light of the environment, and then filter out the scattered light of specific wavelength by the interference filte...

Embodiment 2

[0054] Example 2: Quantitative detection performance test

[0055] Prepare AgNO 3 (10mM), OPE3 (2mM), L-ascorbic acid (10mM), trisodium citrate, gold nanorod sol, potassium thiocyanide, the SERS-based portable single-wavelength Raman photometer provided by the present invention.

[0056] (1) Preparation of gold nanorod sol:

[0057] ① Preparation of seeds

[0058] Take 10mL of 0.1M CTAB aqueous solution and add 250μL of 10mM HAuCl 4 , Stir for two minutes. Then, add 600μL 10mMNaBH 4 , Stir vigorously for 1 minute. Let stand for two hours to make NaBH 4 Completely decompose.

[0059] ②Growth solution preparation

[0060] Take 10mL of 0.1M CTAB aqueous solution and add 500μL of 10mM HAuCl 4 , Then add 200μL 1M HCl solution and 100μL 10mMAgNO 3 , Stir for 2 minutes.

[0061] ③Growth response

[0062] Add 100 μL of ascorbic acid to the growth solution to initiate the reaction, and stop after stirring for one minute. Take 50μL of seeds and add them to the growth solution and let stand for 24...

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Abstract

The invention discloses an SERS-based portable single-wavelength Raman photometer, comprising a signal excitation optical path system, a signal collection optical path system, a mechanical control system and a circuit system, wherein the signal collection optical path system comprises a dichroscope, an achromatism doublet, a pinhole filtering structure, an achromatism doublet, a long pass filter,a narrow band filter and a photomultiplier in sequence; the rayleigh scattering of an SERS signal generated by a monochromatic light excitation sample is filtered when passing through the dichroscope,the scattered light within a target wave band is accurately screened out when passing through the narrow band filter, and finally the signal of the target substance is detected by the photomultiplierat last. By switching the specially designed narrow band filter, the accurate quantitative analysis of three substances can be realized, and the SERS-based portable single-wavelength Raman photometerhas the characteristics of small device volume, high sensitivity, and corresponding rapidity. The SERS-based portable single-wavelength Raman photometer disclosed by the invention is very applicableto the field of analysis where a large amount of repetitive test works are required within a short period of time.

Description

Technical field [0001] The invention belongs to the field of optoelectronics, and relates to a portable single-wavelength Raman photometer based on SERS. Background technique [0002] Raman scattering is based on the inelastic light scattering effect symmetrically distributed on both sides of the Rayleigh scattered light produced by the interaction of light and material. The frequency shift between the scattered light and the incident light corresponds to the composition and structure of the scattered molecules; The composition and structure of the scattering molecules are effectively "fingerprinted". Based on the optical effect of high chemical specificity, Raman spectroscopy technology came into being. It does not require sample pre-treatment, it has the characteristics of non-destructive, fast, and small sample volume, suitable for water-containing systems; it can not separate multiple components , Direct detection, and indirect detection through the principle of derivation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 沈爱国麦家铭吕前辉
Owner WUHAN UNIV
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