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Preparation method of silver-coated gold nanorod colorimetric probe and method for detecting copper ions

A colorimetric probe and gold nanorod technology, applied in the field of copper ion detection, can solve the problems of copper ion detection and lack of selectivity, and achieve good selectivity, high sensitivity, and simple operation

Inactive Publication Date: 2019-08-20
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because these methods either rely on large-scale equipment or lack selectivity, it is impossible to perform rapid on-site detection of copper ions in environmental water samples.

Method used

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  • Preparation method of silver-coated gold nanorod colorimetric probe and method for detecting copper ions
  • Preparation method of silver-coated gold nanorod colorimetric probe and method for detecting copper ions
  • Preparation method of silver-coated gold nanorod colorimetric probe and method for detecting copper ions

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Embodiment 1

[0038] The preparation method of the silver-coated gold nanorod colorimetric probe of the present embodiment comprises the following steps:

[0039] (1) Seed synthesis: In a 25 mL serum bottle, add 40.5 μL of 0.02428 mol / L chloroauric acid solution and 4 mL of 0.1 mol / L CTAB solution, and quickly add 24.5 μL of 0.1 mol / L freshly prepared ice-cold solution under constant stirring. L sodium borohydride solution, the solution quickly turns brown, continue to stir for 2 min, and finally put it in a water bath at 28°C for 2 h to obtain the seed solution;

[0040] The molar concentration of seeds in the obtained seed solution was 0.98 μmol / L.

[0041] (2) Seed growth: In another 25 mL serum bottle, add 206 μL of 0.02428 mol / L chloroauric acid solution, 10 mL of 0.1 mol / L CTAB solution, and 100 μL of 10 mmol / L silver nitrate solution in sequence and 52.5 μL of 100 mmol / L ascorbic acid solution, then add 30 μL of the seed solution prepared in step (1), continue to stir for 2 min, and...

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Abstract

The invention relates to a preparation method of a silver-coated gold nano-rod colorimetric probe, and a method using the probe to detect copper ions. The preparation method of the silver-coated gold nano-rod colorimetric probe comprises the following steps: 1, synthesizing seeds; 2, growing the seeds; 3, centrifuging for purifying gold nano-rods; and 4, synthesizing the silver-coated gold nano-rod colorimetric probe. The invention also provides the method using the silver-coated gold nano-rod colorimetric probe to detect the copper ions. The silver-coated gold nano-rod colorimetric probe has good selectivity on the copper ions, the detection method has high sensitivity, the copper ion naked eye detection concentration reaches 0.1 nmol / L, and the detection limit of colourimetric detection of the copper ions reaches 0.001 nmol / L; and the detection method has the advantages of simplicity and rapidity in operation, no complex or expensive large devices, low cost, realization of naked eye detection, and suitableness for large-scale onsite rapid detection.

Description

technical field [0001] The invention relates to the technical field of copper ion detection, in particular to a method for preparing a silver-coated gold nanorod colorimetric probe and a method for detecting copper ions by etching reaction. Background technique [0002] With the continuous development of electronic technology, the global demand for copper metal is also growing steadily. Environmental pollution caused by improper disposal of smelting and mining residues has attracted people's attention in recent years. It has been confirmed that excessive enrichment of copper ions in the human body can cause damage to the nervous system and urinary system. The US Environmental Protection Agency (EPA) recommends that the content of copper ions in drinking water should be less than 1.3 mg / kg (about 20 μmol / L). Generally speaking, it is very simple to detect copper ions with this content or even lower by laboratory precision instruments such as mass spectrometry, atomic spectr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 许东林亲录王素燕甘继攀郭立群
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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