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Preparation method of silver core-gold shell hexagonal nanometer ring

A technology of nano-rings and silver nano-discs, applied in the direction of nanotechnology, etc., can solve the problems of uneven shape and size of noble metal nano-rings, difficulty in preparation, high cost, etc., and achieve easy promotion and large-scale production, easy appearance, low cost effect

Active Publication Date: 2015-10-21
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of noble metal nanorings by physical methods requires expensive equipment and complex and fine preparation processes, which are costly and difficult to prepare; while the shape and size of noble metal nanorings prepared by chemical methods are not uniform enough

Method used

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  • Preparation method of silver core-gold shell hexagonal nanometer ring
  • Preparation method of silver core-gold shell hexagonal nanometer ring
  • Preparation method of silver core-gold shell hexagonal nanometer ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of a silver-core gold-shell hexagonal nano-ring proposed in this example, its realization schematic diagram is as follows figure 1 As shown, it includes the following steps:

[0031] ①Using the seed-medium growth method to prepare the silver nanodisk solution, the specific process is as follows:

[0032] ①-1. At room temperature, take the precursor reagent and protective agent, then completely dissolve the taken precursor reagent and protective agent in deionized water, and stir evenly to obtain a concentration of both the precursor reagent and the protective agent of 0.22 A mixed solution of mmol / L, wherein the precursor reagent is silver nitrate, and the protective agent is sodium citrate.

[0033] ①-2. Take the first reducing agent, and then completely dissolve the taken first reducing agent in deionized water in an ice bath to obtain a first reducing agent solution with a concentration of 8 mmol / L, wherein the first reducing agent is boron s...

Embodiment 2

[0042]The preparation method of a silver-core gold-shell hexagonal nano-ring proposed in this example, its realization schematic diagram is as follows figure 1 As shown, it includes the following steps:

[0043] ①Using the seed-medium growth method to prepare the silver nanodisk solution, the specific process is as follows:

[0044] ①-1. At room temperature, take the precursor reagent and protective agent, then completely dissolve the taken precursor reagent and protective agent in deionized water, and stir evenly to obtain a concentration of both the precursor reagent and the protective agent of 0.225 A mixed solution of mmol / L, wherein the precursor reagent is silver nitrate, and the protective agent is sodium citrate.

[0045] ①-2. Take the first reducing agent, and then completely dissolve the taken first reducing agent in deionized water in an ice bath to obtain a first reducing agent solution with a concentration of 8.5mmol / L, wherein the first reducing agent is Sodium...

Embodiment 3

[0054] A method for preparing a silver-core gold-shell hexagonal nano-ring structure proposed in this example, its realization schematic diagram is as follows figure 1 As shown, it includes the following steps:

[0055] ①Using the seed-medium growth method to prepare the silver nanodisk solution, the specific process is as follows:

[0056] ①-1. At room temperature, take the precursor reagent and protective agent, and then completely dissolve the taken precursor reagent and protective agent in deionized water, and stir evenly to obtain a concentration of both the precursor reagent and the protective agent of 0.23 A mixed solution of mmol / L, wherein the precursor reagent is silver nitrate, and the protective agent is sodium citrate.

[0057] ①-2. Take the first reducing agent, and then completely dissolve the taken first reducing agent in deionized water in an ice bath to obtain a first reducing agent solution with a concentration of 9 mmol / L, wherein the first reducing agent ...

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Abstract

The invention discloses a preparation method of a silver core-gold shell hexagonal nanometer ring. Firstly, silver nanometer disc solution is prepared by a seed-medium growth method; then, the silver core-gold shell hexagonal nanometer ring is prepared by an electric replacement method; the process of preparing the silver nanometer disc solution is as follows: firstly, mixed solution of a precursor reagent and a protective agent is obtained; then, first reducing agent solution is taken and dripped in the mixed solution to obtain silver seed solution; then, growth solution is prepared; and finally, the silver seed solution and the growth solution are mixed to obtain the silver nanometer disc solution; the process of preparing the silver core-gold shell hexagonal nanometer ring is as follows: firstly, chloroauric acid solution and the silver nanometer disc solution are mixed to obtain purple solution; then, precipitates obtained by centrifugating the solution are renewedly dispersed in de-ionized water to obtain lavender solution; and nanometer particles in the lavender solution are the silver core-gold shell hexagonal nanometer rings. The preparation method has the advantages of simple preparation process, low preparation cost, high yield and uniform morphology of the prepared nanometer ring.

Description

technical field [0001] The invention relates to a preparation technology of a nano-ring, in particular to a preparation method of a silver-core gold-shell hexagonal nano-ring. Background technique [0002] Nanomaterials have attracted extensive attention due to their unique physical and chemical properties and great application prospects in the fields of optics, chemistry, catalysis, drug delivery and biosensing. As an important nanomaterial, noble metal nanoparticles have localized surface plasmon resonance (LSPR, Localized Surface Plasmon Resonance) properties that strongly depend on the structure, size and surrounding medium environment of the nanoparticles. For example, the position of the LSPR peak of gold nanorods is closely related to the aspect ratio of gold nanorods, and the LSPR peaks of the gold nanorods are red-shifted with the increase of the aspect ratio, and vice versa; The wall thickness is related, and its LSPR peak blue shifts with the increase of wall th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B82Y40/00
Inventor 周骏赖魏刘雁婷封昭
Owner NINGBO UNIV
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