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Detection method of free cadmium ion

A detection method and technology for cadmium ions, applied in the field of quantum dots, can solve the problems of poor sensitivity and complicated operation.

Active Publication Date: 2021-04-02
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a detection method for free cadmium ions, aiming at solving the technical problems of poor sensitivity and cumbersome operation of the existing cadmium ion detection method

Method used

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  • Detection method of free cadmium ion
  • Detection method of free cadmium ion
  • Detection method of free cadmium ion

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Taking CdS quantum dots as an example, the method for qualitatively detecting free cadmium ions is introduced in detail below; the detection method includes the following steps:

[0040] (1) Provide 1.5 g of CdS quantum dots modified with 1,8-dichlorooctane.

[0041] (2) Using nitrobenzene as a solvent, mix 1.5g of furan with 0.5g of anhydrous AlCl at 50 degrees Celsius 3 Under the combined action of the catalyst, a substitution reaction occurred with the CdS quantum dots modified by 1,8-dichlorooctane to form a surface coating layer, and it was confirmed that the autofluorescence of the quantum dots was quenched by ultraviolet light irradiation.

[0042] (3) Place the coated CdS quantum dots in a 3mol / L hydrochloric acid environment. If there are free cadmium ions in the quantum dot solution, the free cadmium ions will compete with the furan coated on the surface of the quantum dots. A coordination compound is formed to restore the self-fluorescence of the quantum dot...

Embodiment 2

[0047] Taking CdSe@ZnS quantum dots as an example, the method for qualitative detection of free cadmium ions is described in detail below; the detection method includes the following steps:

[0048] (1) Provide 8.5g of CdSe@ZnS quantum dots modified with 1,8-octanedithiol.

[0049] (2) Using nitrobenzene as a solvent, mix 8.5g pyrrole and 0.8g anhydrous FeCl at 70 degrees Celsius 3 Under the combined action of other catalysts, they reacted with 1,8-octanedithiol-modified CdSe@ZnS quantum dots to form a surface coating layer, and irradiated with ultraviolet light to confirm that the autofluorescence of the quantum dots was quenched.

[0050] (3) Place the coated CdSe@ZnS quantum dots in a 0.5mol / L sulfuric acid environment. If there are free cadmium ions in the quantum dot solution, the free cadmium ions will compete with the coating on the surface of the quantum dots. The pyrrole on the surface forms a coordination compound, which restores the self-fluorescence of the quantum...

Embodiment 3

[0055] Taking CdZnSeTe alloy quantum dots as an example, the method for qualitatively detecting free cadmium ions is described in detail below; the detection method includes the following steps:

[0056] (1) Provide 18.5g of CdZnSeTe alloy quantum dots modified with 1,4-butadiene.

[0057] (2) Using nitrobenzene as a solvent, mix 18.5g thiophene with 1.2g anhydrous FeCl at 60 degrees Celsius 3 Under the combined action of other catalysts, they reacted with 1,4-butadiene-modified CdZnSeTe alloy quantum dots to form a surface coating layer, and irradiated with ultraviolet light to confirm that the quantum dots' autofluorescence was quenched.

[0058] (3) Place the coated CdZnSeTe alloy quantum dots in a 1.0mol / L nitric acid environment. If there are free cadmium ions in the quantum dot solution, the free cadmium ions will compete with the quantum dots coated on the surface of the quantum dots. The thiophene forms a coordination compound, which gradually restores the self-fluore...

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Abstract

The invention belongs to the technical field of quantum dots, and particularly relates to a detection method of free cadmium ions. The method comprises the following steps that a sample solution is provided, the sample solution contains quantum dots with the surfaces combined with surface ligands, the ends, away from binding sites, of the surface ligands contain active functional groups, and the active functional groups are active functional groups capable of conducting an electrophilic reaction with a five-membered heterocyclic compound; a five-membered heterocyclic compound is added into thesample solution, so that the five-membered heterocyclic compound and the surface ligand are subjected to an electrophilic reaction, the quantum dots are subjected to fluorescence quenching, and an intermediate solution is obtained; the intermediate solution is adjusted to be acidic, and then a judgment is made whether the sample solution contains free cadmium ions or not according to the fluorescence change of the quantum dots in the intermediate solution. The method has the characteristics of being easy to operate, simple, rapid and low in cost.

Description

technical field [0001] The invention belongs to the technical field of quantum dots, and in particular relates to a detection method for free cadmium ions. Background technique [0002] Quantum Dot and quantum dot-related materials and devices have been hailed as one of the core technology engines of today's Industry 4.0 era, because each small particle is a single crystal particle, and its size has good tunability. Therefore, it has the characteristics of high color purity, wide color gamut, high crystal stability, narrow and symmetrical fluorescence emission spectrum, wide and continuous ultraviolet absorption spectrum, which makes it an ideal new material for printing and display. [0003] As we all know, in optoelectronic lighting and display devices, the purity requirements of optoelectronic starting materials are very high. The introduction of trace amounts of cadmium ions will not only affect the optical and electrical characteristics of the optoelectronic material i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64C09K11/56C09K11/88C09K11/02
CPCC09K11/025C09K11/565C09K11/883G01N21/643G01N2021/6432
Inventor 邓承雨杨一行钱磊谢相伟
Owner TCL CORPORATION
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