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Detection method of free cadmium ions

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: 2020-03-27
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 ions
  • Detection method of free cadmium ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The following takes CdSe quantum dots as an example to introduce in detail.

[0050](1) Provide 2.0 g of CdSe quantum dots modified with ethanedithiol.

[0051] (2) 10ml of nitrobenzene was added as a solvent, and the initial fluorescence intensity value of the CdSe quantum dots was measured to be 5500 by fluorescence spectroscopy. Add 5mg / ml furan dropwise under the action of 0.5g anhydrous AlCl3 catalyst at 50°C, and measure the fluorescence intensity value every time 0.1ml furan solution is added until the fluorescence intensity drops close to 0. According to the quality of adding furan and the change of CdSe quantum intensity, draw the equation between the addition amount and the fluorescence intensity, y=-1145x+5297.5 (as figure 1 shown).

[0052] (3) Add a small amount of hydrochloric acid to the coated CdSe quantum dot solution to adjust the pH of the solution to 1. Heating the solution to 80 degrees Celsius for 2 hours, the free cadmium ions in the quantum do...

Embodiment 2

[0055] The following takes CdS@ZnSe quantum dots as an example to introduce in detail.

[0056] (1) Provide 35.0 g of CdS@ZnSe quantum dots modified with 1,3-propanedithiol.

[0057] (2) 175ml of nitrobenzene was added as a solvent, and the initial fluorescence intensity value of CdS@ZnSe quantum dots was measured to be 9500 by fluorescence spectroscopy. Under the action of 4.5g anhydrous AlCl3 catalyst at 70°C, 5 mg / ml pyrrole was added dropwise, and the fluorescence intensity value was measured every time 0.1ml pyrrole solution was added until the fluorescence intensity dropped close to 0. According to the mass of added pyrrole and the change of the intensity of CdS@ZnSe quantum dots, the equation between the added amount and the fluorescence intensity is obtained, y=-1230x+6347.

[0058] (3) Add a small amount of sulfuric acid to the coated CdS@ZnSe quantum dot solution to adjust the pH of the solution to 2. Heating the solution to 80 degrees Celsius for 4 hours, the free...

Embodiment 3

[0061] The following takes CdZnSeSTe alloy quantum dots as an example to introduce in detail.

[0062] (1) Provide 20.0 g of CdZnSeSTe alloy quantum dots modified with 1,8-octanedithiol.

[0063] (2) 100ml of nitrobenzene was added as a solvent, and the initial fluorescence intensity value of the CdZnSeSTe alloy quantum dots was measured to be 7500 by fluorescence spectroscopy. Under the action of 2.4g of anhydrous FeCl3 catalyst at 65°C, 5mg / ml thiophene was added dropwise, and the fluorescence intensity value was measured every time 0.1ml of thiophene solution was added until the fluorescence intensity dropped close to 0. According to the quality of the added thiophene and the change of the intensity of the CdZnSeSTe alloy quantum dot, the equation between the added amount and the fluorescence intensity is obtained, y=-1467x+7934.

[0064] (3) Add a small amount of nitric acid to the coated CdZnSeSTe alloy quantum dot solution to adjust the pH of the solution to 3. Heating...

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Abstract

A detection method of free cadmium ions comprises the steps that a sample solution is provided, the sample solution contains quantum dots with the surfaces combined with surface ligands, and the ends,away from binding sites, of the surface ligands contain active functional groups capable of having an electrophilic reaction with a five-membered heterocyclic compound; the corresponding relationshipis determined between the fluorescence intensity of the quantum dots in the sample solution and the dosage of the five-membered heterocyclic compound; the five-membered heterocyclic compound is addedinto a sample solution; the five-membered heterocyclic compound and the surface ligand are subjected to an electrophilic reaction to obtain an intermediate solution, and the dosage of the five-membered heterocyclic compound is configured to prevent quantum dots of the sample solution from complete fluorescence quenching and to be larger than the dosage required for complete reaction of free cadmium ions in the intermediate solution in a subsequent acid environment; after the intermediate solution is adjusted to be acidic, the fluorescence intensity of the quantum dots in the intermediate solution is detected, and the amount of the free cadmium ions in the sample solution is determined according to the detected fluorescence intensity of the quantum dots in the intermediate solution and thecorresponding relation.

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 (Quantum Dot) and quantum dot-related materials and devices have been hailed as one of the core technologies in the current display field. Because each quantum dot unit is a single crystal particle, and the size has good tunability, it has high color purity, wide color gamut, high thermal stability, narrow and symmetrical fluorescence emission spectrum, wide and continuous ultraviolet absorption spectrum, which makes it an ideal new material for printed displays. [0003] As we all know, in optoelectronic lighting and display devices, the purity requirements of optoelectronic starting materials are very high. Usually, there will be a trace amount of cadmium ions left after the cadmium-containing quantum dots are synthesized and cleaned. According to the mass percentage, the resi...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432
Inventor 邓承雨杨一行钱磊谢相伟
Owner TCL CORPORATION
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