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Optical feedback device and method based on hollow optical fiber SERS detection

A hollow-core optical fiber and optical feedback technology, which can be used in measurement devices, material analysis by optical means, scientific instruments, etc., can solve the problems of secondary pollution of nanoparticle clusters, and achieve simple preparation, cost reduction, and enhancement of Raman signals. Effect

Pending Publication Date: 2021-01-05
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the disadvantage of easily introducing secondary pollution of nanoparticle clusters into the liquid environment to be tested.

Method used

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  • Optical feedback device and method based on hollow optical fiber SERS detection
  • Optical feedback device and method based on hollow optical fiber SERS detection
  • Optical feedback device and method based on hollow optical fiber SERS detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Realization of a SERS structure coated inside a hollow fiber

[0039] (1) Ultrasonic cleaning of a hollow fiber with an inner diameter of 600 μm in acetone and ethanol once for use;

[0040] (2) Preparation of silver nanoparticles:

[0041] Add an aqueous solution of silver nitrate to the toluene solution in which tetraoctylammonium bromide is dissolved, and stir the solution at the same time, wherein the quality of tetraoctylammonium bromide is 1.5g, the volume of toluene solvent is 80mL, the quality of silver nitrate is 0.32g, and the volume of water 2mL;

[0042] After the silver nitrate is completely dissolved, add 20mL sodium borohydride aqueous solution with a concentration of 0.37mol / L, stop stirring after 5min, and the chemical reaction ends;

[0043] Separate the colloidal solution to remove the water phase, and remove the organic phase by vacuum distillation; add methanol to the black viscous liquid containing silver nanoparticles, and the silver ...

Embodiment 2

[0051] Example 2: Comparison of Raman spectra of R6G ethanol solution with or without silver nanoparticles SERS structure on the inner wall

[0052] The hollow fiber whose inner wall is coated with the silver nanoparticle SERS structure is placed in a concentration of 10 -3 In the mol / L rhodamine 6G alcohol solution environment, the Raman signal was excited by using a 785nm excitation light source, the excitation light output power was 100mW, and the integration time was 1s. The enhanced Raman spectrum of the resulting rhodamine 6G is as Figure 4 shown in thin lines. Simultaneously place pure silica fibers with equal inner diameter lengths in a concentration of 10 -3 mol / L rhodamine 6G alcohol solution, the measured Raman signal is as follows Figure 4 shown in bold. The Raman signal of the rhodamine 6G molecule at the same concentration in the alcohol solution was significantly enhanced under the effect of the silver nanoparticle SERS structure.

Embodiment 3

[0053] Example 3: The Raman results of different concentrations of R6G ethanol solutions measured by a hollow fiber coated with a silver nanoparticle SERS structure on the inner wall

[0054] The hollow fiber with SERS structure coated with silver nanoparticles on the inner wall was placed in different concentrations of 10 -6 In the mol / L rhodamine 6G alcohol solution environment, the Raman signal was excited by using a 785nm excitation light source, the excitation light output power was 100mW, and the integration time was 1s. The enhanced Raman spectrum of gained rhodamine 6G alcoholic solution is as Figure 5 shown. Along with the concentration of rhodamine 6G ethanol solution reduces, successively as follows Figure 5 Curves (1)(2)(3), the Raman-enhanced signal of rhodamine 6G measured by the hollow fiber coated with silver nanoparticles SERS structure gradually weakens. The lower concentration that can detect rhodamine 6G ethanol solution is 10 -6 mol / L.

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Abstract

The invention discloses an optical feedback device and method based on hollow optical fiber SERS detection, and belongs to the technical field of optical detection. The optical feedback device comprises a hollow optical fiber internally plated with an SERS structure and a solid optical fiber with the end face being provided with metal film feedback, wherein the solid optical fiber with the end face being provided with metal reflective film feedback is coaxially nested in the hollow optical fiber internally plated with the SERS structure and can slide in the hollow optical fiber internally plated with the SERS structure, and a metal reflective film on the end face of the solid optical fiber is perpendicular to the axial direction and located in the hollow optical fiber internally plated with the SERS structure. When the device is used for detecting micro-content substances in the liquid environment, secondary pollution to the detection environment can be reduced, the micro-content substances widely distributed in the liquid environment can be subjected to three-dimensional Raman excitation and signal collection, and a new technical method is provided for detection of pollutants in environmental water.

Description

technical field [0001] The invention belongs to the technical field of nanometer photonic devices oriented to environmental engineering and sensor technology. Construct the feedback mechanism and structure of spatial Raman spectroscopy, realize volume excitation and volume collection of Raman spectroscopy, significantly enhance the intensity of Raman spectroscopy signals, thereby improving the detection sensitivity of targets in liquid substances, and providing new solutions for the detection of pollutants in environmental water. technical method. Background technique [0002] Raman scattering spectroscopy can reveal the structural information of substances, and can identify substances and determine their content, but its weak intensity is not conducive to the identification and detection of trace substances. Surface-enhanced Raman scattering (Surface Enhanced Raman Scattering, SERS), as an effective detection method for micro-content substances, has been widely used becaus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 张新平穆云云刘淼
Owner BEIJING UNIV OF TECH
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