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Preparation method of hollow-core optical fiber SERS probe based on self-assembly of two kinds of silver nanoparticles

A technology of silver nanoparticles and hollow-core optical fibers, which is applied to measurement devices, material analysis by optical means, instruments, etc., can solve the problems of poor density and poor uniformity of fiber SERS substrates, and achieves simple preparation process, good application prospects, The effect of surface-enhanced Raman scattering enhancement

Active Publication Date: 2017-03-08
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: The problem of poor uniformity and poor density in the preparation of the optical fiber SERS substrate by the self-assembly method is not solved. The patent of the present invention provides a method for preparing a hollow-core optical fiber SERS probe based on self-assembly of two silver nanoparticles, which is used for Preparation of SERS substrate on inner surface of hollow core optical fiber

Method used

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  • Preparation method of hollow-core optical fiber SERS probe based on self-assembly of two kinds of silver nanoparticles
  • Preparation method of hollow-core optical fiber SERS probe based on self-assembly of two kinds of silver nanoparticles
  • Preparation method of hollow-core optical fiber SERS probe based on self-assembly of two kinds of silver nanoparticles

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Embodiment 1

[0028] A method for preparing a hollow-core fiber SERS probe based on self-assembly of two silver nanoparticles, using the electrostatic adsorption of silver nanostar particles and gold-core silver-shell nanorod solutions with different electrical charges, in the hollow-core fiber The surface is self-assembled layer by layer to form a fiber optic SERS probe with two nanoparticle structures. This probe has a good application prospect in surface-enhanced Raman scattering.

[0029] This embodiment uses the electrostatic adsorption of silver nanostar particles (negatively charged) and gold-core silver-shell nanorod solution (positively charged) to self-assemble layer by layer on the inner surface of the hollow-core optical fiber to form a nanoparticle structure with two Fiber SERS probe. Specifically include the following steps:

[0030] Material preparation:

[0031] 1. Preparation of silver nanostar particles. Mix and stir 5mL 0.05M sodium hydroxide and 5mL 0.06M hydroxylami...

Embodiment 2

[0046] The difference between this embodiment and Embodiment 1 is that: in step 1, the length of one end of the hollow-core optical fiber immersed in the concentrated sulfuric acid solution is 0.5 cm, and the concentrated sulfuric acid treatment time is 0.8 hours. Piranha solution treatment time was 1.8 hours,

[0047] In step 2, the soaking time of the hollow-core fiber in the polyelectrolyte solution is 1.8 hours, and in step 3, the soaking time of the hollow-core fiber obtained in step 2 in the silver nanostar particle solution is 2.8 hours. In step 4, the hollow-core optical fiber obtained in step 3 is soaked in the gold-core silver-shell nanorod solution for 2.8 hours.

Embodiment 3

[0049] The difference between this embodiment and embodiment 1 is that: in step 1, the length of one end of the hollow-core optical fiber immersed in the concentrated sulfuric acid solution is 1.5 cm, and the concentrated sulfuric acid treatment time is 1.2 hours. Piranha solution treatment time is 2.2 hours,

[0050] In step 2, the soaking time of the hollow-core optical fiber in the polyelectrolyte solution is 2.2 hours. In step 3, the soaking time of the hollow-core optical fiber obtained in step 2 in the silver nanostar particle solution is 3.2 hours. In step 4, the hollow-core optical fiber obtained in step 3 is soaked in the gold-core silver-shell nanorod solution for 3.2 hours.

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Abstract

The invention discloses a preparation method of a hollow-core optical fiber SERS probe based on self-assembly of two kinds of silver nanoparticles; with use of principles of capillary action and electrostatic adsorption of hollow-core optical fibers, a coupling agent and silver star nanoparticles are successively injected, and a monolayer silver nanoparticle structure is self-assembled on the inner wall of the hollow-core optical fibers. After that, a gold-core silver-shell nanorod solution with opposite charges to that of the silver star nanoparticles is injected, and a denser double-layer silver nanoparticle structure is formed on the inner wall of the hollow-core optical fiber. The method is simple and convenient, and the hollow-core optical fiber SERS probe for detection of a variety of substances can be obtained through changing electrical properties of an outermost layer of silver nanoparticles. At the same time, the hollow-core optical fiber SERS probe is used for no-standard detection of yeast.

Description

technical field [0001] The invention relates to a method for electrostatic self-assembly on the inner wall of a hollow-core optical fiber to prepare a surface-enhanced Raman scattering (SERS, Surface-enhanced Raman Scattering) hollow-core optical fiber probe, which belongs to the technical field of optical fiber sensing. Background technique [0002] As an effective detection method, surface-enhanced Raman scattering has been widely studied and applied due to its advantages such as narrow signal spectrum characteristic peaks and no fluorescence quenching. The inner diameter of the hollow-core optical fiber is adjustable, the optical transmission loss is small, and it has a large inner surface area. It has important application space and prospects in biology, physics, and chemistry. It is of great significance to combine hollow-core fiber with surface-enhanced Raman scattering technology. [0003] In order to improve the detection sensitivity of surface-enhanced Raman scatte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 王著元邓苏晓崔一平
Owner SOUTHEAST UNIV