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Gold and silver hybrid nanoparticles as well as preparation method and application thereof

A nanoparticle and gold nanosphere technology, which is applied in the field of nanocomposite materials and its preparation, can solve the problems of reducing anti-counterfeiting ability, less hybrid structure, and reducing detection accuracy, achieving strong practical application value, mild implementation conditions, and The effect of increasing complexity

Inactive Publication Date: 2020-07-17
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some challenges in SERS anti-counterfeiting
The first problem is that the Raman signal is not strong enough, and the insufficient intensity of SERS will increase the difficulty of detection and reduce the accuracy of detection
At present, many Raman enhancement methods have been developed. The structure of gold, silver and precious metals can effectively enhance the Raman signal, but at present, most of them are limited to a single structure, and there are few complex hybrid structures.
The second problem is that the actual available SERS molecule library is not large
Theoretically, SERS has a huge molecular library, but not all molecules can be put into the hotspot area, and generally require strong bonding with noble metals, which limits the capacity of the available SERS molecular library
The third problem is that the coding complexity is not enough
A single SERS molecule has a limited number of Raman resonance peaks, which will result in a lower number of codes, thereby reducing the ability of anti-counterfeiting
Both strong SERS signal and large and complex SERS coding library are the core issues in actual anti-counterfeiting applications

Method used

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  • Gold and silver hybrid nanoparticles as well as preparation method and application thereof
  • Gold and silver hybrid nanoparticles as well as preparation method and application thereof
  • Gold and silver hybrid nanoparticles as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 4-Mercaptobenzoic acid is a commonly used mercapto ligand, which has strong binding ability to gold particles and has obvious Raman signal. In order to facilitate the characterization of Raman enhancement effect, 4-mercaptobenzoic acid is used as a model here The molecule is taken as an example to elaborate in detail, and the specific process is as follows:

[0047] 1) Preparation of gold-silver nano-hybrid structure

[0048] Take a certain amount of gold nanoparticles (in this experiment, 1mL, 40nm gold particles) for centrifugal concentration, add an appropriate amount of water (1mL) to redisperse, and add an appropriate amount of sodium hydroxide aqueous solution (in this experiment, 3μL, 0.25M) and 4-mercaptobenzoic acid in ethanol (8 μL, 0.57 mM in this experiment). The above solution was incubated at 60° C. for about 4 h, then 45 μL of 250 mM sodium chloride aqueous solution was added, mixed evenly, and then incubated at 60° C. for 3 h until the color of the solu...

Embodiment 2-9

[0059] The ligands in Example 1 can be replaced with other kinds of ligands, and the Raman signal of the ligands can be effectively enhanced by this method. Except that the concentration and volume of the ligand solution and the amount of sodium chloride need to be adjusted, other steps are basically the same as in Example 1. The specific experimental dosage is shown in Table 1 below:

[0060] Table 1

[0061]

[0062] For the results of Raman signal enhancement of the ligands shown in the example, see Figure 4 .

Embodiment 10-18

[0064] When using other mixed ligands to synthesize the designed structure, only the amount of mixed ligands and sodium chloride needs to be adjusted, and other processes are basically the same. The specific experimental dosage is shown in Table 2 below:

[0065]

[0066] The Raman result of embodiment 10-18 is as Figure 5 shown.

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Abstract

The invention relates to an anti-counterfeiting technology for enhancing a mixed ligand Raman signal based on a gold-silver nano hybrid structure; an enhanced mixed Raman spectrogram is subjected to conversion coding, the enhanced mixed Raman spectrogram can be effectively identified through mobile phone software, and the technology can realize effective anti-counterfeiting of signatures. The preparation method comprises the following steps: (1) preparing a gold-silver nano hybrid structure jointly modified by mixed ligands, and coating the gold-silver nano hybrid structure with a polystyrene-polyacrylic acid block copolymer; and (2) loading the product in the step (1) into transparent water-based ink, and uniformly mixing to obtain the anti-counterfeiting ink based on surface enhanced Raman; and (3) signing by using the ink prepared in the step (2), converting and encoding a signed Raman curve to obtain a corresponding bar code, and accurately identifying the bar code obtained by conversion by adopting designed mobile phone software. The invention has the advantages of simple and easily available raw materials, simple and safe operation process, low cost, and strong practicality.

Description

technical field [0001] The invention relates to a gold-silver nano-hybrid particle, a preparation method and application thereof, a nanocomposite material and a preparation method and application thereof. Background technique [0002] The phenomenon of counterfeiting and shoddy products has been a problem that has plagued people since ancient times, and the whole world faces huge losses every year. Counterfeiting of personal identity is a particularly serious category of counterfeiting and shoddy phenomena. At the same time, signature is a symbol of personal identity, so it is necessary to develop anti-counterfeiting of signature. Doping fluorescent materials in ink, such as quantum dots, lanthanide luminescent materials, organic fluorescent materials, etc., is currently the most important method for ink anti-counterfeiting. Although fluorescent materials are easy to detect and have good visualization. However, fluorescent materials are limited by the overlap of emission ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65B22F1/02B22F1/00
CPCG01N21/658B22F1/17B22F1/054
Inventor 陈虹宇王红周玉赛
Owner NANJING UNIV OF TECH
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