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Preparation method of self-assembled silver ball SERS (Surface Enhanced Raman Scattering) base with controllable silver nano sheet thickness

A silver nanosheet, self-assembly technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of inability to provide, complex preparation methods, etc., and achieve the effects of convenient operation, simple reaction conditions, and short reaction time.

Inactive Publication Date: 2013-08-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above methods either cannot provide a comparable series of substrate samples for systematic research on SERS, or are not self-assembled, but only two-dimensional structures, and the preparation methods are complicated

Method used

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  • Preparation method of self-assembled silver ball SERS (Surface Enhanced Raman Scattering) base with controllable silver nano sheet thickness
  • Preparation method of self-assembled silver ball SERS (Surface Enhanced Raman Scattering) base with controllable silver nano sheet thickness
  • Preparation method of self-assembled silver ball SERS (Surface Enhanced Raman Scattering) base with controllable silver nano sheet thickness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] (1) Use silver nitrate as the silver source, L-ascorbic acid as the reducing agent, and citric acid as the modifying agent to make aqueous solutions respectively, wherein the ratio of silver nitrate: L-ascorbic acid is 1:1 molar ratio, organic acid: silver nitrate is 0.0025:1 molar ratio, above-mentioned raw material is made into aqueous solution;

[0028] (2) Add the silver nitrate solution to the water cooled in the ice bath under the condition of stirring, take a small amount of organic acid solution with a micropipette, add it to the silver nitrate solution, stir evenly, and then add the L-ascorbic acid solution once Quickly added to the mixed solution, reacted for 2 minutes under stirring conditions in an ice bath, collected the precipitate, and washed it with deionized water until the pH value reached 7, that is, a self-assembled silver ball SERS substrate with a surface silver nanosheet thickness of 26 nm was obtained . The X-ray diffraction (XRD) pattern of the...

Embodiment approach 2

[0030] (1) Use silver nitrate as the silver source, L-ascorbic acid as the reducing agent, and citric acid as the modifying agent to make aqueous solutions respectively, wherein the ratio of silver nitrate: L-ascorbic acid is 1:1 molar ratio, organic acid: silver nitrate is 0.0075:1 molar ratio, above-mentioned raw material is made into aqueous solution;

[0031] (2) Add the silver nitrate solution to the water cooled in the ice bath under the condition of stirring, take a small amount of organic acid solution with a micropipette, add it to the silver nitrate solution, stir evenly, and then add the L-ascorbic acid solution once Quickly added to the mixed solution, reacted for 7 minutes under stirring conditions in an ice bath, collected the precipitate, and washed it with deionized water until the pH value reached 7, that is, a self-assembled silver ball SERS substrate with a surface silver nanosheet thickness of 41 nm was obtained . Its XRD result is the same as Embodiment 1...

Embodiment approach 3

[0033] (1) Use silver nitrate as the silver source, L-ascorbic acid as the reducing agent, and citric acid as the modifying agent to make aqueous solutions respectively, wherein the ratio of silver nitrate: L-ascorbic acid is 1:1 molar ratio, organic acid: silver nitrate is 0.01-0.025:1 molar ratio, making the above raw materials into an aqueous solution;

[0034] (2) Add the silver nitrate solution to the water cooled in the ice bath under the condition of stirring, take a small amount of organic acid solution with a micropipette, add it to the silver nitrate solution, stir evenly, and then add the L-ascorbic acid solution once Quickly added to the mixed solution, reacted for 10 minutes under stirring conditions in an ice bath, collected the precipitate, and washed it with deionized water until the pH value reached 7, that is, a self-assembled silver ball SERS substrate with a thickness of 57 nm of silver nanosheets on the surface was obtained. Its XRD result is the same as E...

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Abstract

The invention belongs to the field of a nanometer material science and a laser Raman detection technology, and particularly relates to a preparation method of a self-assembled silver ball SERS (Surface Enhanced Raman Scattering) base with a controllable silver nano sheet thickness. The method takes silver nitrate as a silver source and L-ascorbic acid as a reducing agent, and comprises the following steps of: adding one organic acid with controlled amount to react in an ice bath (2-5 DEG C) for 2-15 minutes to obtain a silver micro-ball which is formed by self-assembling silver nano sheets with the controllable thickness in a range of 20-110nm. The silver micro-ball formed by self-assembling the silver nano sheets, which is prepared by the method, not only has the characteristic of high specific surface area of a common nano material, but also has the characteristics of controllable thickness of the surface silver nano sheets and serial and comparable surface roughness; and the silver micro-ball formed by self-assembling the silver nano sheets is a surface enhanced Raman base with the very good activity and is hopeful to be applied to aspects of surface enhanced fluorescence and photocatalysis.

Description

[0001] technical field [0002] The invention belongs to the technical fields of nanomaterial science and laser Raman detection, and in particular relates to the preparation of a surface-enhanced Raman (SERS) substrate of self-assembled silver microspheres with controllable thickness of silver nanosheets on the surface. Background technique [0003] Surface-enhanced Raman scattering (SERS) is a micro-analysis technique with extremely high sensitivity. For infrared spectroscopy, Raman spectroscopy avoids the influence of moisture on detection. The key to obtaining high-quality SERS signals is the surface-enhanced substrate. Surface-enhanced substrates are often nanostructured. The particle size, shape, and arrangement of surface-enhanced substrates are closely related to SERS activity. In order to improve the SERS activity, researchers at home and abroad have been exploring the preparation methods of substrates with higher SERS activity from both theoretical and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24G01N21/65
Inventor 胡建玲王凤平李泉水徐美路彦珍李岩刘雪姣廖福成卫宏儒张志刚
Owner UNIV OF SCI & TECH BEIJING
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