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Method of preparing cone-shaped optical fiber SERS probe by laser induced one-step lifting method

A tapered optical fiber, laser-induced technology, applied in Raman scattering, material excitation analysis, material analysis through optical means, etc., can solve the problems that are not suitable for the preparation of tapered optical fiber SERS probes, so as to ensure the repeatability of the preparation , high sensitivity, simple operation

Active Publication Date: 2019-03-26
DONGGUAN UNIV OF TECH
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Problems solved by technology

However, these methods are currently mainly used for the preparation of flat-end fiber SERS probes, and are not suitable for the preparation of tapered fiber SERS probes.

Method used

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  • Method of preparing cone-shaped optical fiber SERS probe by laser induced one-step lifting method
  • Method of preparing cone-shaped optical fiber SERS probe by laser induced one-step lifting method
  • Method of preparing cone-shaped optical fiber SERS probe by laser induced one-step lifting method

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Embodiment Construction

[0021] Such as figure 1 As shown, a method for preparing a tapered optical fiber SERS probe by a laser-induced one-step pulling method includes a laser 1, a tapered optical fiber 2, a noble metal nanoparticle sol 3 and a one-dimensional precision displacement platform 4. The tapered optical fiber One end of 2 is a flat end, and the other end is a tapered end. The flat end of the tapered optical fiber 2 is welded to the output pigtail of the laser 1, and the tapered end is inserted into the pre-prepared noble metal nanoparticle sol 3. The middle part of the tapered optical fiber Fixed on the moving end of the one-dimensional precision displacement platform 4; turn on the laser 1, and under the irradiation of the induced laser, use the one-dimensional precision displacement platform 4 to slowly pull the tapered end of the optical fiber from the noble metal nanoparticle sol 3 to the tapered end. The cone tip is located near the upper surface interface of the noble metal nanoparti...

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Abstract

The invention discloses a method of preparing a cone-shaped optical fiber SERS probe by a laser induced one-step lifting method. The method comprises the following steps: welding the flat end of an optical fiber with an output tail fiber of a laser device and inserting the cone end of the optical fiber into a metal nanoparticle sol prepared in advance; turning on a laser light source, and slowly lifting the optical fiber cone from the sol till the cone tip is fully exposed out of the liquid level by means of a one-dimensional precise displacement platform under induced laser radiation; and drying the optical fiber cone within a short time by laser induction, wherein the solvent is evaporated quickly and the nanoparticles are adsorbed to the optical cone face to form the optical fiber SERSprobe. The method has the advantages of being low in cost, simple to operate and the like. Compared with a flat end surface optical fiber SERS probe, the cone-shaped optical fiber SERS probe preparedby the method is expected to achieve a larger Raman interaction area and better detecting sensitivity and repeatability, so that the practical process of the optical fiber SERS probe is facilitated and the method has an important application prospect in the fields of living body, online, on-site and remote detection of a Raman spectrum.

Description

technical field [0001] The invention relates to the technical field of surface-enhanced Raman scattering spectroscopy, in particular to a method for preparing a tapered optical fiber SERS probe by a laser-induced one-step pulling method. Background technique [0002] Surface-enhanced Raman scattering (Surface Enhanced Raman Scattering, SERS) is a Raman spectroscopy enhancement technology developed in recent years, which uses the Localized Surface Plasmon Resonance (LSPR) effect of noble metal nanoparticles to Achieving great enhancement of Raman signal, the enhancement factor can be as high as 10 8 -10 12 , has attracted extensive attention from scientists. Combining optical fiber sensing technology with SERS technology, the optical fiber SERS probe formed by preparing noble metal nanoparticles or structures on the surface of the optical fiber has the advantages of low cost, good spectral repeatability, compact structure, and strong anti-interference ability, and is expect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N21/01
CPCG01N21/01G01N21/658G01N2021/656
Inventor 周飞刘晔凌东雄王红成
Owner DONGGUAN UNIV OF TECH
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