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Multilayer core-shell structured Au@SiO2@Ag@SiO2 nano composite material and preparation method therefor

A nanocomposite material and multi-layer core-shell structure technology, which is applied in the preparation of microspheres and microcapsule preparations, can solve problems such as lattice defects, and achieve strong Raman signals, high detection sensitivity, and good reproducibility

Inactive Publication Date: 2015-10-28
BEIHANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] However, even though Au and Ag belong to the face-centered cubic system and have similar lattice parameters ( : Au and : Ag), but it will still cause lattice defects, which will seriously reduce the surface plasmon resonance effect of hybrid metal nanocomposites and affect its SERS detection effect (see reference [7]: Y.Sun, Y.Xia, Nano Lett.2003,3,1569; Y.Li,B.-P.Zhang,C.-H.Zhao,L.Zou,J.-X.Zhao,J.Mater.Res.2014,29(2), 221.)

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  • Multilayer core-shell structured Au@SiO2@Ag@SiO2 nano composite material and preparation method therefor
  • Multilayer core-shell structured Au@SiO2@Ag@SiO2 nano composite material and preparation method therefor
  • Multilayer core-shell structured Au@SiO2@Ag@SiO2 nano composite material and preparation method therefor

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preparation example Construction

[0025] The multilayer core-shell structure AuSiO provided by the present invention 2 AgSiO 2 The preparation method of nanocomposite material specifically comprises the following steps:

[0026] The first step, AuSiO 2 Preparation of core-shell nanomaterials:

[0027] Get 20~60ml 0.01% (mass percentage) chloroauric acid solution and when heated to boiling, add 0.1~0.5ml 1wt% sodium citrate solution and react, the solution changes from light yellow to slightly blue and then becomes transparent brownish red, wait After the reaction was complete, the heating was stopped and cooled to room temperature naturally. Then add aminosilane solution, stir at room temperature, then add 0.5~4ml 0.04M sodium silicate solution, stir at room temperature, transfer to 90~96°C oil bath for reaction, stop heating and cool down naturally to obtain AuSiO 2 Core-shell nanomaterials, such as figure 1 shown.

[0028] The second step, AuSiO 2 AgSiO 2 Preparation of core-shell nanomaterials:

[...

Embodiment 1

[0032] The first step, AuSiO 2 Preparation of core-shell nanomaterials:

[0033] Take 30ml 0.01wt% chloroauric acid solution and heat it to boiling, add 0.2ml 1wt% sodium citrate solution and react for 20 minutes, the solution turns from light yellow to slightly blue and then transparent brown red, after the reaction is complete Turn off the heat and cool to room temperature naturally. Then add 0.4ml 1mM aminosilane solution successively, stir at room temperature for 10min, then add 2ml 0.04M sodium silicate solution, stir at room temperature for 5min, then transfer to 93°C oil bath for reaction for 1h, turn off the heating and cool down naturally to obtain SiO 2 AuSiO with a shell thickness of 3nm 2 Core-shell nanomaterials.

[0034] The second step, AuSiO 2 AgSiO 2 Preparation of core-shell nanomaterials:

[0035] AuSiO 2 AgSiO 2 Core-shell nanomaterials: under dark conditions, in the above AuSiO 2 Add 540ul of 0.1M ascorbic acid, 135ul of 0.1M silver nitrate and 67...

Embodiment 2

[0038] Change the amount of sodium silicate solution into 0.5ml 0.04M sodium silicate solution in the first step of embodiment 1 to prepare SiO 2 AuSiO with a shell thickness of 1nm 2 Core-shell structure nanomaterial, all the other are the same as embodiment 1.

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Abstract

The invention discloses a multilayer core-shell structured Au@SiO2@Ag@SiO2 nano composite material and a preparation method therefor and belongs to the technical field of preparation of nano composite materials. The method comprises the steps of firstly preparing a Au@SiO2 core-shell structured nano-material, then, sequentially adding ascorbic acid, silver nitrate and sodium hydroxide into the Au@SiO2 core-shell structured nano-material, then, adding an amino silane solution into the Au@SiO2 core-shell structured nano-material, then, adding a sodium silicate solution into the Au@SiO2 core-shell structured nano-material, carrying out room-temperature stirring, then, shifting the mixture in oil bath with 93 DEG C for reaction, finally, stopping heating, and carrying out natural cooling. The nano composite material has the characteristics of high detection sensitivity, strong Raman signal, good reproducibility and high accuracy. According to the preparation method, the nano composite material is mainly prepared by chemical methods, and defects caused by crystal lattice mismatch are reduced through coating different noble metals with ultrathin SiO2 layers, so that Raman signals of target molecules are further strengthened. A Raman probe prepared from the nano composite material is easy to functionalize, so that the range of action of the Raman probe is wide.

Description

technical field [0001] The invention relates to a multilayer complex core-shell structure AuSiO 2 AgSiO 2 Raman probe preparation method, specifically the ultrathin SiO 2 The method is coated on the surface interface of Au and Ag with Raman enhancement effect, and belongs to the technical field of preparation of nanocomposite materials. Background technique [0002] The localized surface plasmon resonance effect (LSPR) of noble metal nanoparticles has broadened its scope of use, while surface-enhanced Raman (SERS) labeling technology, as a spectral labeling technique, utilizes the surface plasmon resonance of noble metal nanoparticles such as gold or silver characteristic, amplifies the Raman signal of a molecule adsorbed on a rough metal surface by 10 6 ~10 14 times, it can detect the monolayer or sub-monolayer adsorbed on the surface of the material, and provide rich structural information of the surface molecules, so as to obtain the Raman signal of the adsorbed Raman...

Claims

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Application Information

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IPC IPC(8): B01J13/06
Inventor 翟锦汪洋
Owner BEIHANG UNIV
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