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Gold-core silver-shell nanoprobe, preparation method thereof and application thereof in cyanide ion colorimetric detection

A nanoprobe, cyanide ion technology, applied in nanotechnology, analysis by chemical reaction of materials, material analysis by observing the impact on chemical indicators, etc., can solve the problem of low specificity, long reaction time, problems such as poor water compatibility, to achieve the effect of good selectivity, high sensitivity and short reaction time

Inactive Publication Date: 2014-10-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method with simple and convenient synthesis, sensitive response and specificity for the deficiencies such as poor water compatibility, long reaction time, complex synthesis of organic receptors and low specificity in the existing cyanide colorimetric detection method. High-advantage gold-core silver-shell nanoprobe suitable for colorimetric detection of cyanide ion in environmental water samples and preparation method thereof

Method used

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  • Gold-core silver-shell nanoprobe, preparation method thereof and application thereof in cyanide ion colorimetric detection
  • Gold-core silver-shell nanoprobe, preparation method thereof and application thereof in cyanide ion colorimetric detection
  • Gold-core silver-shell nanoprobe, preparation method thereof and application thereof in cyanide ion colorimetric detection

Examples

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Embodiment 1

[0029] Example 1: The detection effect of the gold core silver shell nanoprobe prepared by the present invention on a series of cyanide ion solutions is given below. Prepare a series of cyanide ion solutions (0-160μM) with a concentration, add the gold core silver shell nanoparticle solution, and take pictures and scan the ultraviolet-visible spectrum after reacting at room temperature for 5 minutes. Figure 4 It shows that with the increase of cyanide concentration, the color of the solution changes from yellow to pink, and finally to colorless. According to the color change, the semi-quantitative detection of cyanide concentration can be realized. Figure 5 It shows that as the cyanide concentration increases, the absorbance at 394nm gradually decreases, and the change in absorbance has a good linear relationship with the cyanide concentration in the range of 0-100μM ( Image 6 ), the linear correlation coefficient reached 0.9984, and the minimum detection concentration was 0.4μ...

Embodiment 2

[0030] Example 2: The response time curves of the gold core silver shell nanoparticles of the present invention for detecting different concentrations of cyanide are given below. Prepare cyanide ion solutions of different concentrations, add gold core silver shell nanosols respectively, and monitor the relationship curve between the change in absorbance at 394 nm and the reaction time at room temperature using a spectrophotometer. by Figure 7 As shown, when the gold core silver shell nanosol is exposed to the cyanide ion environment, the absorbance value at 394nm decreases significantly within 1 min, and then tends to balance, indicating that the gold core silver shell nanoparticles of the present invention are used to detect cyanide ion It has the advantages of fast response speed and short response time.

Embodiment 3

[0031] Example 3: The following provides a comparison of the response effects of the gold core silver shell nanoparticles of the present invention on cyanide and 18 other types of anions. Figure 8 It is shown that the response signal of the gold core silver shell nanoparticles of the present invention to cyanide ions is 9.2-230 times that of all other 18 anions, indicating that the method has high specificity for cyanide ions.

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Abstract

The invention relates to a gold-core silver-shell nanoprobe, in particular to a gold-core silver-shell nanoprobe, a preparation method thereof and application thereof in cyanide ion colorimetric detection. The gold-core silver-shell nanoprobe is a spherical nanoparticle of a core-shell structure, a core is made of gold and 11-14nm in diameter, a shell is made of silver and 1.3-7.4nm in thickness, and stabilizers are citrate ions absorbed on the surface of the silver shell. The particle size of the gold-core silver-shell nanoprobe is 13.6-28.8nm. The preparation method includes: dissolving HAuCl4 in water to prepare an HAuCl4 solution, and heating the HAuCl4 solution to boiling to obtain a solution A; additionally dissolving sodium citrate in water, and heating the solution to boiling to obtain a solution B; mixing the solution A and the solution B, enabling the mixed solution to change from light yellow to wine red after heating, and cooling the mixed solution to room temperature so as to obtain a gold nanoparticle solution; dissolving the gold nanoparticle solution in water, sequentially adding a Tollens' reagent and formaldehyde, and making the solution to change to yellow after reaction so as to obtain the gold-core silver-shell nanoprobe.

Description

Technical field [0001] The invention relates to a gold core silver shell nano probe, in particular to a gold core silver shell nano probe suitable for colorimetric detection of cyanide ions. Background technique [0002] Cyanide is one of the deadliest poisons, because it can interact with Fe of cytochrome oxidase 3+ In combination, cyanide cytochrome oxidase is produced, which makes the cell lose the ability to transmit electrons, and eventually suffocates and die. Although cyanide is highly toxic, it is still widely used in industrial fields such as metal smelting, electroplating and organic polymer synthesis. The widespread use of cyanide leads to its inevitably excessive discharge in the environment, which increases the risk of surface water and groundwater contamination. Due to the high toxicity of cyanide, the World Health Organization has made strict regulations on the content of cyanide in drinking water, stipulating that its maximum allowable concentration in drinking w...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02G01N21/78B82Y40/00
Inventor 曾景斌赵翠影曹莹莹陈秀秀种法运任卫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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