A kind of sandwich structure composite particle SERS active substrate and preparation method thereof

An active substrate and sandwich technology, applied in the direction of material excitation analysis, instruments, measuring devices, etc., to achieve the effects of good reproducibility, improved sensitivity, and mild reaction conditions

Active Publication Date: 2019-08-09
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are few reports on combining graphene oxide with gold and silver particles to make full use of their respective advantages to construct a sandwich-structured surface-enhanced Raman scattering substrate.

Method used

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  • A kind of sandwich structure composite particle SERS active substrate and preparation method thereof
  • A kind of sandwich structure composite particle SERS active substrate and preparation method thereof
  • A kind of sandwich structure composite particle SERS active substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation of flower-shaped silver / graphene oxide substrate specifically comprises the following steps:

[0026] (1) Preparation of flower-shaped silver particles: 1M silver nitrate, 1M ascorbic acid, and 1M polyvinylpyrrolidone solutions were respectively prepared 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 obtain flower-shaped silver particles . The prepared flower-shaped silver particles were centrifuged and washed 3 times before being used in the next step.

[0027] (2) Preparation of the flower-shaped silver substrate: put the silicon wafer into the prepared piranha solution, and place it at 90°C for 2 hours. After the silicon chip was taken out, it was washed with clean water, placed in a 3-mercaptopropyltrimethoxysilane (MPTMS) solution and soak...

Embodiment 2

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

[0031] At room temperature, prepare 50 mM silver nitrate and 1%wt sodium citrate solutions respectively. Add 1 mL of silver nitrate solution and 1 mL of sodium citrate solution into 48 mL of deionized water, stir vigorously, add 0.005 g of sodium borohydride, and continue stirring for 15 minutes to obtain silver seeds. Centrifuge (1200 rpm, 15 minutes) to get the upper layer solution, to 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, 0.1 M ascorbic acid, and 0.1 mM chloroauric acid solutions respectively. Add 10 mL of chloroauric acid solution to 0.1 mL of the silver seed solution prepared in Example 2, stir, and simultaneously quickly add 0.05 mL of ascorbic acid solution and 0.5 mL of silver nitrate solution, and continue stirring for 1 minute to obtain a gold nanostar solution.

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Abstract

Belonging to the technical field of laser Raman detection, the invention in particular relates to a flower-like silver / graphene oxide / gold nanostar sandwich structure SERS active substrate and a preparation method thereof. The flower-like silver / graphene oxide / gold nanostar sandwich structure SERS active substrate includes a carrier, and the carrier comprises a flower-like silver particle layer, a graphene oxide particle layer and a gold nanostar particle layer from bottom to top in order. According to the sandwich structure substrate constructed by the invention, the gold nanostar particles and flower-like silver particles in each layer have plasma resonance coupling effect, and the gold nanostar and flower-like silver particles between each layer also have plasma resonance coupling effect, so that the sandwich structure substrate provided by the invention has more excellent surface enhanced Raman scattering effect than single-layer substrates.

Description

technical field [0001] The invention belongs to the technical field of laser Raman detection, and in particular relates to a SERS active substrate with a flower-like silver / graphene oxide / gold nanostar sandwich structure and a preparation method thereof. Background technique [0002] Surface-enhanced Raman scattering (SERS) technology is a highly sensitive, fast, accurate, and non-destructive molecular detection technology, which has broad application prospects in analytical chemistry, biomedicine, and environmental detection. It is generally believed that the mechanism of SERS is mainly derived from the electromagnetic enhancement (EM) caused by the localized surface plasmon resonance effect of nanoparticles and the chemical enhancement (CM) effect caused by 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. The use of gold, silver ...

Claims

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Application Information

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