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A core-shell structure composite particle SERS active substrate and preparation method thereof

A technology of composite particle and core-shell structure, applied in the direction of material excitation analysis, instrument, measuring device, etc., to achieve excellent SERS effect, excellent plasmon resonance coupling effect, and improve repeatability

Active Publication Date: 2019-04-19
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few reports on organically combining the advantages of graphene oxide with gold and silver particles to construct composite particles with a core-shell structure as a surface-enhanced Raman scattering substrate.

Method used

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  • A core-shell structure composite particle SERS active substrate and preparation method thereof
  • A core-shell structure composite particle SERS active substrate and preparation method thereof
  • A core-shell structure composite particle SERS active substrate and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] The preparation method of flower-shaped silver@graphene oxide composite particles specifically includes the following steps:

[0027] (1) Preparation of flower-like silver particles: Prepare 1M silver nitrate, 1M ascorbic acid, and 1M polyvinylpyrrolidone solutions at room temperature. Add the prepared 0.3mL silver nitrate solution and 2mL polyvinylpyrrolidone solution into 10mL deionized water, stir; then quickly add 0.2mL prepared ascorbic acid solution into the mixed solution, and continue stirring for 15 minutes to form flower-shaped silver particles . The prepared flower-shaped silver particles were centrifuged and washed 3 times before being used in the next step.

[0028] (2) Preparation of flower-shaped silver@graphene oxide composite particles: graphene oxide was prepared by Hummers method, and 0.01mg / mL graphene oxide solution was prepared by ultrasonic dispersion. Add 1mL flower-shaped silver particles prepared in step (1) to 9mL deionized water, stir gentl...

Embodiment 2

[0030] The preparation method of gold nano star particle silver seed core specifically comprises the following steps:

[0031] At room temperature, prepare 50mM silver nitrate and 1% sodium citrate solutions respectively. Add the prepared 1mL silver nitrate solution and 1mL sodium citrate solution into 48mL deionized water, stir vigorously, add 0.005g sodium borohydride, and continue stirring for 15 minutes to obtain silver seeds. Centrifuge it (1200 rpm, 15 minutes) to get the upper layer solution, which will be used in the next step.

Embodiment 3

[0033] The preparation method of gold nano star particle specifically comprises the following steps:

[0034] At room temperature, prepare 1mM silver nitrate, 0.1M ascorbic acid, and 0.1mM chloroauric acid solutions respectively. Add 10mL of chloroauric acid solution to the 0.1mL silver seed solution prepared in Example 2 and stir, and at the same time quickly add 0.05mL ascorbic acid solution and 0.5mL silver nitrate solution and continue stirring for 1 minute to obtain gold nanostars.

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Abstract

Belonging to the technical field of laser Raman detection, the invention in particular relates to a flower-shaped silver@graphene oxide@gold nanostar core-shell structure composite particle SERS active substrate and a preparation method thereof. The core-shell structure composite particle is composed of a core layer of a single grain flower-shaped silver particle, a middle coating layer of graphene oxide and an outermost layer of a gold nanostar particle. The core-shell structure composite particle serves as the SERS active substrate. Being visible under an optical microscope, the SERS active substrate can be used for high efficiency single particle SERS detection. According to the invention, gold nanostar particles and flower-shaped silver particles are combined for the first time, the excellent surface plasma resonance coupling effect between gold nanostar and flower-shaped silver particles endows the substrate with more excellent surface enhanced raman scattering effect than monolayer particles.

Description

technical field [0001] The invention belongs to the technical field of laser Raman detection, and specifically relates to a flower-shaped silver@graphene oxide@gold nanostar core-shell composite particle SERS active substrate and a preparation method thereof. Background technique [0002] Surface-enhanced Raman scattering (SERS) technology is a very effective molecular detection technology, which has broad application prospects in chemical sensing, biosensing, bioimaging, pollutant detection, cancer diagnosis and other fields. Its enhancement mechanism is mainly divided into electromagnetic enhancement (EM) and chemical enhancement (CM). The electromagnetic enhancement depends on the localized surface plasmon resonance effect of nanoparticles, and the chemical enhancement depends on the charge transfer between the detection molecule and the SERS substrate. The sum of electromagnetic enhancement and chemical enhancement can produce about 10 9 -10 11 Raman-enhanced signal o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 张丛筠郝锐刘晓宇刘亚青赵贵哲张慧娟
Owner ZHONGBEI UNIV
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