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Preparation method of Au@SiO2 Core-shell nanoparticles

A nanoparticle, core-shell technology, applied in the field of preparation of Au@SiO2 core-shell nanoparticles, can solve problems such as easy agglomeration and precipitation, poor stability, and limited application

Inactive Publication Date: 2020-04-28
HAIMEN YUANMEI MEISHU TUAN SHEJI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high surface energy of Au nanoparticles, they are sensitive to foreign interferences, making them easy to agglomerate and precipitate, so their stability in detection is poor, which limits its application in complex environments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of Au@SiO 2 The preparation method of core-shell nanoparticles comprises the following steps: dissolving 5 parts of chloroauric acid in 95 parts of deionized water, heating to boiling; adding 20 parts of trisodium citrate powder into 65 parts of deionized water, stirring until completely dissolved, Get 15 parts and add rapidly in the boiling chloroauric acid solution, stir 20min under the boiling situation, during this period, the solution color changes to yellow, gray, blue, deep purple, wine red, then remove the heat source, cool to room temperature, get Au sol solution; add 11 parts of APS to 50 parts of ethanol, then add it to 20 parts of Au sol, let it stand for 45 minutes, so that the complexation reaction of the amine group can completely occur on the Au nanoparticles, then add 15 parts of TEOS, slowly Stir for 26 hours until the core-shell structure is formed, and store the prepared solution at 4° C.; all raw materials are in parts by weight.

Embodiment 2

[0017] A kind of Au@SiO 2 The preparation method of core-shell nanoparticles comprises the following steps: dissolving 4 parts of chloroauric acid in 90 parts of deionized water, heating to boiling; adding 15 parts of trisodium citrate powder into 60 parts of deionized water, stirring until completely dissolved, Get 10 parts and add rapidly in the boiling chloroauric acid solution, stir for 15min under the boiling situation, during this period, the solution color changes to yellow, gray, blue, deep purple, wine red, then remove the heat source, cool to room temperature, get Au sol solution; add 9 parts of APS to 45 parts of ethanol, then add it to 15 parts of Au sol, let it stand for 40 minutes, so that the amine group can completely undergo complexation reaction on the Au nanoparticles, then add 10 parts of TEOS, slowly Stir for 25 hours until the core-shell structure is formed, and store the prepared solution at 4° C.; all raw materials are in parts by weight.

Embodiment 3

[0019] A kind of Au@SiO 2 The preparation method of core-shell nanoparticles comprises the following steps: dissolving 6 parts of chloroauric acid in 100 parts of deionized water, heating to boiling; adding 25 parts of trisodium citrate powder into 70 parts of deionized water, stirring until completely dissolved, Get 20 parts and quickly add in boiling chloroauric acid solution, stir 25min under the boiling situation, during this period, the solution color changes to yellow, gray, blue, dark purple, wine red, then remove the heat source, cool to room temperature, get Au sol solution; add 13 parts of APS to 55 parts of ethanol, then add it to 25 parts of Au sol, let it stand for 50 minutes, so that the amine group can completely undergo complexation reaction on the Au nanoparticles, then add 20 parts of TEOS, slowly Stir for 27 hours until the core-shell structure is formed, and store the prepared solution at 4° C.; all raw materials are in parts by weight.

[0020] The method...

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PUM

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Abstract

The invention discloses a preparation method of Au@SiO2 Core-shell nanoparticles. The preparation method comprises the following steps that chloroauric acid is dissolved in deionized water, and heating is conducted to boiling; trisodium citrate powder is added into the deionized water, and is stirred until complete dissolving, a mixture is rapidly added into a boiling chloroauric acid solution, stirring is conducted for 15-25 min under boiling, then a heat source is removed, cooling is conducted to a room temperature, and an Au sol solution is obtained; and APS is added to ethanol, then a mixture is added to the Au sol solution to be allowed to stand for 40-50 min, amido can be subjected to a complex reaction over the Au nanoparticles, then TEOS is added, slow stirring is conducted for 25-27 h until a core-shell structure is formed, and a prepared solution is kept at 4 DEG C to obtain finished products. The method is simple and convenient and easy to operate, and the prepared Au@SiO2 core-shell nanoparticles have strong SERS activity on rhodamine B, and can be used as best SERS active substrates for analysis, testing and like of samples.

Description

technical field [0001] The present invention relates to a kind of Au@SiO 2 Preparation methods of core-shell nanoparticles. Background technique [0002] Surface-enhanced Raman scattering (SERS) is a new spectral analysis technique with high sensitivity, short detection time and convenient operation that can obtain the structure and chemical composition information of the molecular level material surface. It has been obtained in the fields of physics, biomedicine and chemistry. widely used. [0003] The core-shell nanoparticles formed by compounding nanomaterials with different functions are a new type of high-performance active substrate for SERS, which can obtain more stable SERS signals and functions such as enrichment separation, catalysis, and specific molecular recognition. Nano-sized colloidal gold particles have attracted much attention due to their unique optical properties, and are often combined with other nanomaterials to form core-shell nanoparticles, which ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00G01N21/65B82Y30/00B82Y40/00
CPCB22F9/24G01N21/658B82Y30/00B82Y40/00B22F1/0553B22F1/07B22F1/054
Inventor 不公告发明人
Owner HAIMEN YUANMEI MEISHU TUAN SHEJI CO LTD
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