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Gold nanoparticle, preparation method and application thereof

A gold nanoparticle and gold nanoparticle technology, applied in nanotechnology, nanotechnology, metal processing equipment, etc., can solve the problems of difficult synthesis of precious metal nanoparticles, sensitivity and stability to be improved, limited enhancement, etc., and achieve good promotion The effect of application potential, simple and efficient preparation method, and excellent sensitivity

Pending Publication Date: 2022-05-31
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing noble metal nanoparticles have a limited enhancement effect on sensitivity, and the synthesis of noble metal nanoparticles with uniform size and shape and rough surface structure is relatively difficult, resulting in the detection sensitivity and stability still need to be improved. Therefore, preparation by chemical means The problem of simple, effective, economical and potential noble metal nanoparticles for highly sensitive detection of organic pollutants needs to be solved urgently

Method used

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  • Gold nanoparticle, preparation method and application thereof
  • Gold nanoparticle, preparation method and application thereof
  • Gold nanoparticle, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A gold nanoparticle, which is used to enhance the SERS effect, the gold nanoparticle is a spiny gold nanoparticle, the surface of the spiny gold nanoparticle has a spiny structure, and the particle size is 60-165nm.

[0036] The preparation method of the spiny gold nanoparticles comprises the following steps:

[0037] (1) Place all glassware required to be used in freshly prepared HCl / HNO 3 (Volume ratio 3:1) wash with mixed solution and deionized water, and dry;

[0038] (2) Under continuous stirring, mix 99mL of distilled water and 1.06mL of HAuCl 4 Solution (0.0254mol / L) is added in the round-bottomed flask and heated to boiling, then 1.0mL freshly prepared sodium citrate solution (0.0388mol / L) is added in the described round-bottomed flask, after continuing heating for 15 minutes, room temperature cooling, Obtain AuNPs with a particle size of 60nm and use them as gold seed particles;

[0039] (3) Add 1.8 g of cetyltrimethylammonium bromide (CTAB) to 100 mL of dis...

Embodiment 2

[0041] A gold nanoparticle of spiny gold nanoparticle and a preparation method thereof, which are basically the same as in Example 1, except that the amount of KI solution added in step (3) is 200 μL.

Embodiment 3

[0043] A gold nanoparticle, which is used to enhance the SERS effect, the gold nanoparticle is a triangular gold nanoparticle, and the triangular gold nanoparticle is in the shape of a quasi-square triangle with a side length of 60-70nm.

[0044] The preparation method of the triangular gold nanoparticles comprises the following steps:

[0045] 1.6 mL of cetyltrimethylammonium bromide (CTAC) solution (0.1 mol / L) was added into a 20 mL round-bottomed flask containing 8 mL of distilled water, followed by 75 μL of KI solution (0.01 mol / L), Then sequentially add 80 μL of HAuCl 4 solution (0.0254mmol / L) and 20.3μL of NaOH solution (0.1mol / L) (HAuCl 4 : NaOH=1:1), the mixed solution system is light yellow, after shaking the flask moderately, inject 80 μL of ascorbic acid solution (0.064mol / L) into the mixed solution, the solution gradually changes from light yellow to colorless, inject Add 10 μL of NaOH solution (0.1mol / L) and shake the flask rapidly, the colorless solution turns re...

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Abstract

The invention discloses gold nanoparticles as well as a preparation method and application thereof. The gold nanoparticles are used for enhancing the SERS effect and are spinous gold nanoparticles or triangular gold nanoparticles, spinous structures are arranged on the surfaces of the spinous gold nanoparticles, and the particle size of the particles ranges from 60 nm to 165 nm; the triangular gold nanoparticles are in the shape of a regular triangle, and the side length of the triangular gold nanoparticles ranges from 60 nm to 70 nm. The invention also provides a preparation method and application of the particle, AuNPs with special morphology is used as an SERS substrate, based on the special size morphology and surface structure of the AuNPs, the SERS signal of a detection sample can be significantly enhanced, and the particle has excellent sensitivity, detection limit and repeatability stability for detection of parathion-methyl.

Description

technical field [0001] The invention relates to the technical field of surface-enhanced Raman spectroscopy, in particular to a gold nanoparticle, a preparation method and its application on a SERS sensor. Background technique [0002] In today's society, environmental pollution and food safety issues are increasingly concerned, and the quality control of agricultural and sideline products and related environmental problems have also become one of the issues that people pay more and more attention to. Therefore, many scholars have devoted themselves to the detection of pollutants in agricultural and sideline products. Research. Currently, existing methods include chromatography and surface-enhanced Raman scattering (Surface-enhanced Raman scattering, SERS) spectroscopy. Chromatographic detection methods rely on large-scale instruments, the sample pretreatment process is complicated, operators need special training, and the cost is high, which limits the monitoring of polluta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/054B22F9/24G01N21/65B82Y15/00B82Y30/00B82Y40/00
CPCB22F9/24G01N21/658B82Y15/00B82Y30/00B82Y40/00Y02A50/30
Inventor 陈山多伍辉祥刘兆清王晓云侯丽萍梁楚妍
Owner GUANGZHOU UNIVERSITY
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