Laser-induce self-assembly method for preparing high-sensitivity optical fiber SERS probe

A self-assembly method, laser-induced technology, applied in material excitation analysis, Raman scattering, etc., can solve the problems of difficult to meet the practical requirements of high-throughput preparation, weak SERS enhancement factor, complex preparation process, etc., to achieve high local field The effect of enhancement factor, short preparation cycle and simple operation

Inactive Publication Date: 2016-01-13
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

Generally, the chemical preparation method is simple to operate and low in cost, but most of the prepared nanostructures are noble metal nanoparticle island films, and the SERS enhancement factor is weak (about 10 4 order of magnitude); while the physical prep

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  • Laser-induce self-assembly method for preparing high-sensitivity optical fiber SERS probe
  • Laser-induce self-assembly method for preparing high-sensitivity optical fiber SERS probe
  • Laser-induce self-assembly method for preparing high-sensitivity optical fiber SERS probe

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Embodiment Construction

[0026] Such as figure 1 Shown, a kind of laser-induced self-assembly method prepares the method for high-sensitivity optical fiber SERS probe, comprises the following steps:

[0027] (1) One end of the optical fiber 2 is welded to the output pigtail of the laser 1, and the other end is inserted into the pre-prepared noble metal nanoparticle sol 4;

[0028] (2) After the optical fiber 2 is completely infiltrated with the sol, the optical fiber 2 is slowly lifted to the surface of the liquid surface by using the one-dimensional precision displacement platform 3, and the meniscus structure 5 is formed under the surface tension of the liquid;

[0029] (3) Turn on the laser light source, and under the irradiation of the induced laser, the noble metal nanoparticles at the meniscus 5 self-assemble and arrange on the end face of the optical fiber 2 to form an optical fiber SERS probe.

[0030] The optical fiber 2 can be a variety of low-loss transmission optical fibers such as silica...

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Abstract

The invention discloses a laser-induce self-assembly method for preparing a high-sensitivity optical fiber SERS probe. The method comprises the steps of conducting fusion welding on one end of an optical fiber and an output tail fiber of a laser device, and inserting the other end of the optical fiber into precious metal nano-particle sol; slowly lifting the optical fiber from the sol to be higher than the liquid level by a certain height by means of a one-dimensional precise displacement platform, so that a specific meniscus structure is formed; switching on a laser light source to enable precious metal nano-particles at the position of the meniscus to be self-assembled at the end face of the optical fiber under laser radiation, so that the optical fiber SERS probe is formed. The laser-induce self-assembly method has the advantages of being low in cost, easy to operate, short in preparation cycle, high in preparation repeatability and the like. The prepared optical fiber SERS probe has high detection sensitivity and high spectrum repeatability and has important application prospects in remote/field detection of environment pollutants, in-vivo analysis in biomedicine, real-time detection of chemical reaction process and other fields.

Description

technical field [0001] The invention relates to the technical field of surface-enhanced Raman spectroscopy molecular detection, in particular to a method for preparing a high-sensitivity optical fiber SERS probe by a laser-induced self-assembly method. Background technique [0002] Raman spectroscopy has "fingerprint" characteristics and can be used for the detection and identification of various molecules. However, the Raman scattering interface of molecules is usually very small, making it difficult to achieve high-sensitivity measurement. Surface Enhanced Raman Scattering (SERS) spectroscopy utilizes the local field enhancement properties of noble metal nanostructures, which can greatly enhance the intensity of Raman signals (typical enhancement factors are 10 4 -10 10 magnitude), and has important applications in the fields of pollutant detection, analytical chemistry, biomedicine, and environmental science. [0003] The SERS substrate is the key to realize high-sensi...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 刘晔毛庆和孟国文黄竹林周飞姚波
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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