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Preparation method of Au@Ag@AgCl nanoparticles and application thereof in colorimetric detection of ammonia

A nanoparticle and nanoparticle technology, applied in the field of Au@Ag@AgCl nanoparticle probe for ammonia colorimetric detection, can solve the problems of poor probe sensitivity and stability

Active Publication Date: 2021-07-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of the existing ammonia colorimetric detection method, such as the need to improve the sensitivity of the probe, poor stability, etc., using a Au@Ag@AgCl nanoparticle with a three-layer core-shell structure as the Specific probe, providing a kind of Au@Ag@AgCl nanoparticle and its preparation method for colorimetric detection of ammonia concentration with the advantages of sensitive response, strong specificity and high stability

Method used

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  • Preparation method of Au@Ag@AgCl nanoparticles and application thereof in colorimetric detection of ammonia
  • Preparation method of Au@Ag@AgCl nanoparticles and application thereof in colorimetric detection of ammonia
  • Preparation method of Au@Ag@AgCl nanoparticles and application thereof in colorimetric detection of ammonia

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Embodiment 1

[0043] Example 1: The detection effect of the Au@Ag@AgCl nanoparticle probe example prepared by the present invention on ammonia solutions with series concentrations is given below. A series of ammonia solutions (0-5000 μM) were prepared, and the Au@Ag@AgCl nanoparticle probe solution was added. After reacting for 10 minutes at room temperature (25°C±2°C), photographs were taken and UV-visible absorption spectra were scanned. Figure 11 (a) shows that when the ammonia water is in the range of 0-1600 μM, the absorbance value of the characteristic absorption peak at 510 nm of the Au@Ag@AgCl nanoparticle probe solution gradually increases with the increase of the ammonia water concentration, and the change value of the absorbance It has a good linear relationship with the ammonia concentration ( Figure 11 (b)), the linear correlation coefficient reaches 0.997, and the minimum detection concentration calculated according to the linear equation is 6.4 μM; Figure 12 (a) shows tha...

Embodiment 2

[0044] Embodiment 2: The following is a comparison of the response effects of the Au@Ag@AgCl nanoparticle probe embodiment of the present invention to ammonia gas and other 10 interfering reagents / gases. Figure 13 It shows that the response signal of the Au@Ag@AgCl nanoparticle probe of the present invention to ammonia is 8.12-139 times that of all other 10 interfering reagents / gases, indicating that the method has high specificity to ammonia.

Embodiment 3

[0045] Embodiment 3: The following is an embodiment of the Au@Ag@AgCl nanoparticle probe of the present invention for detecting an actual gas sample. In order to test the feasibility of this method in the detection of ammonia content in actual samples, it was applied to the detection of ammonia content in simulated polluted gases. Aqueous ammonia solution (9 mM, 10 mL) was injected into a constant volume (20 L) gas sampling bag, which was then filled with air by an air pump to prepare contaminated gas. It is then divided into 4 gas sampling bags (5 liters) for use. Four more gas sampling bags (5 liters) were used to collect fresh air. Various amounts of aqueous ammonia aqueous standard solutions (0.17, 0.34, 0.51, 0.68, 1.02mg / L) were injected into the gas sampling bags. Before analysis, the air sampling bag was heated to 50°C to ensure uniform diffusion of ammonia gas. Gas samples with different concentrations were drawn into 20 mL medical syringes into which 5 mL of Au@Ag...

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Abstract

The invention discloses a preparation method of Au@Ag@AgCl nanoparticles for colorimetric detection of ammonia concentration. The method comprises the following steps: firstly, reducing a HAuCl4 solution in a water phase by taking a sodium citrate solution as a reducing agent to prepare Au nanospheres; then reducing an AgNO3 solution by using ascorbic acid under a weak alkaline condition through an epitaxial growth method, and depositing a layer of silver shell on the prefabricated Au nanospheres; and then depositing a layer of thin AgCl on the Au@Ag nanoparticles through the oxidation etching effect of FeCl3 on the Ag shell to obtain the Au@Ag@AgCl nanoparticles with a three-layer core-shell structure. A nanoparticle probe is subjected to a specific reaction with ammonia, so that the components and the shell components of the nano probe are changed, and the absorbance of the material is obviously changed; and the nano probe is high in specificity and sensitivity to ammonia response, stable in performance, convenient and fast, and rapid qualitative and semi-quantitative analysis of the ammonia concentration can be realized by naked eyes.

Description

technical field [0001] The invention relates to an Au@Ag@AgCl nanoparticle with a three-layer core-shell structure, in particular to an Au@Ag@AgCl nanoparticle probe suitable for colorimetric detection of ammonia gas. Background technique [0002] Ammonia is a colorless, poisonous gas with a strong pungent smell, and its main sources include nature and man-made. Nitrogen in the air can be converted into ammonia under the fixation of microbial plants and enter the soil to participate in the ecological cycle; and chemical industry, metallurgical industry, automobile manufacturing, refrigeration industry, coal mine combustion and other industries will also artificially produce a large amount of ammonia. In recent decades, with the rapid development of industrialization and urbanization, global ammonia emissions have been increasing year by year. As a gas that is extremely harmful to the human body, even at low concentrations, ammonia gas can cause serious irritation to the hum...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B22F1/02B82Y30/00B82Y40/00G01N21/31
CPCB22F9/24B82Y40/00B82Y30/00G01N21/31B22F2301/255B22F1/07B22F1/065B22F1/17B22F1/16B22F1/054Y02A50/20
Inventor 曾景斌仇志伟梁心怡崔炳文张云芝
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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