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Silver-mesoporous silica-silver sandwich core shell nanometer material and preparation and application thereof

A technology of mesoporous silica and core-shell nanomaterials, which is applied in the direction of nanotechnology, nanotechnology, material excitation analysis, etc., can solve the problems of reduction, SERS signal large-scale scattering detection ability, etc., and achieve simple preparation process, easy promotion and Effects of large-scale production and extended storage time

Inactive Publication Date: 2016-02-03
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then when the silica shell is thicker, it is easy to cause the SERS signal to be scattered and absorbed a lot, so that the detection ability of this core-shell structure is greatly reduced.

Method used

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  • Silver-mesoporous silica-silver sandwich core shell nanometer material and preparation and application thereof
  • Silver-mesoporous silica-silver sandwich core shell nanometer material and preparation and application thereof
  • Silver-mesoporous silica-silver sandwich core shell nanometer material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Preparation of stable silver-mesoporous silica-silver sandwich core-shell nanomaterials with high SERS activity

[0029] The preparation method includes the following steps:

[0030] 1. Add 30μL ammonia water and 0.17g silver nitrate to 20mL water to make silver ammonia solution. 5 mL of the above solution was mixed with 5 mL of a 60 mM aqueous solution of cetyltrimethylammonium bromide (CTAB) and 10 mL of a 2 mM aqueous glucose solution and stirred thoroughly. The above-mentioned mixed solution was added to an autoclave with 25mL polytetrafluoroethylene lining and reacted at 120°C for 12 hours, then naturally cooled to room temperature, and centrifuged once with ethanol and water respectively (5000 rpm for 5 minutes) , the precipitate was collected after centrifugation, and the silver nanomaterials were obtained by separation.

[0031] 2. Disperse the silver nanomaterial prepared above in a mixed solution consisting of 5 mL of water, 3 mL of ethanol, 75 mg ...

Embodiment 2

[0037] Example 2 Preparation of stable silver-mesoporous silica-silver sandwich core-shell nanomaterials with high SERS activity

[0038] The preparation method includes the following steps:

[0039] 1. Add 60μL ammonia water and 0.17g silver nitrate to 20mL water to make silver ammonia solution. Take 5 mL of the above solution, mix with 5 mL of 80 mM cetyl trimethyl ammonium bromide (CTAB) aqueous solution and 10 mL of 6 mM aqueous glucose solution and stir well. The above-mentioned mixed solution was added to an autoclave with 25mL polytetrafluoroethylene lining and reacted at 135°C for 12 hours, then naturally cooled to room temperature, and centrifuged once with ethanol and water (6000 rpm for 10 minutes) , the precipitate was collected after centrifugation, and the silver nanomaterials were obtained by separation.

[0040] 2. Disperse the silver nanomaterial prepared above in a mixed solution consisting of 10 mL of water, 6 mL of ethanol, 85 mg of CTAB and 300 μL of amm...

Embodiment 3

[0046] Example 3 Preparation of stable silver-mesoporous silica-silver sandwich core-shell nanomaterials with high SERS activity

[0047] The preparation method includes the following steps:

[0048] 1. Add 90μL ammonia water and 0.17g silver nitrate to 20mL water to make silver ammonia solution. 5 mL of the above solution was mixed with 5 mL of 100 mM cetyltrimethylammonium bromide (CTAB) aqueous solution and 10 mL of 10 mM aqueous glucose solution and stirred thoroughly. The above-mentioned mixed solution was added to an autoclave with 25mL polytetrafluoroethylene lining and reacted at 150°C for 24 hours, then naturally cooled to room temperature, and centrifuged once with ethanol and water respectively (10,000 rpm for 30 minutes) , the precipitate was collected after centrifugation, and the silver nanomaterials were obtained by separation.

[0049] 2. Disperse the silver nanomaterial prepared above in a mixed solution consisting of 25 mL of water, 15 mL of ethanol, 100 mg...

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Abstract

The invention provides a stable silver-mesoporous silica-silver sandwich core shell nanometer material high in SERS activity. The core shell nanometer material is composed of an inner core, a middle layer and an outer shell. The inner core is silver nanometer particles with the practical size ranging from 10 micrometers to 90 micrometers. The middle layer is a mesoporous silica layer with the thickness ranging from 10 micrometers to 200 micrometers. The outer side of the middle layer is wrapped with the outer shell formed by the silver nanometer particles with the practical size ranging from 10 micrometers to 90 micrometers. The stable silver-mesoporous silica-silver sandwich core shell nanometer material is prepared from a hydrothermal reaction method, inner-layer precious metal silver nanometer particles and outer-layer precious metal silver nanometer particles are arranged, the surface local area electromagnetic fields generated by the precious metal silver nanometer particles can generate the coupling effect under the action of external exciting light, and an SERS signal with the extremely high intensity is generated and output. The preparation process is simple, short in period and high in yield is high, and the material is easy to popularize and suitable for mass production.

Description

technical field [0001] The invention relates to the fields of material engineering and nanotechnology, in particular to a silver-mesoporous silica-silver sandwich core-shell nanomaterial, a preparation method and application thereof. Background technique [0002] As a simple, fast, non-destructive and highly sensitive spectroscopic analysis technique, surface-enhanced Raman scattering (SERS) has been widely used in chemical, biological and environmental monitoring fields. Among them, the high-sensitivity detection capability of SERS technology is mainly based on the enhanced localized electromagnetic field formed by the localized surface plasmon resonance characteristics of noble metal nanoparticles. Therefore, the core material of this technology is precious metal (gold, silver and copper, etc.) nanomaterials. Compared with the other two types of materials, silver nanoparticles have higher SERS activity, but due to their high chemical activity, silver nanoparticles that ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24G01N21/65B82Y30/00B82Y40/00
Inventor 姜涛周骏王晓龙张利赵子奇
Owner NINGBO UNIV
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