A dual-response fluorescent sensor based on polyethyleneimine functionalized carbon quantum dots and cdtes quantum dots and its preparation method

A polyethyleneimine and fluorescent sensor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of limited application and easy oxidation of preparation

Active Publication Date: 2020-11-17
NORTHWEST UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

During the preparation of double-ligand-modified quantum dots, the selection of modifiers and the adjustment of dual-response emission peaks limit their application in quantitative analysis and detection
However, during the composite process of quantum dots and noble metals, the difficulty of preparing noble metals and being easily oxidized has become a limiting factor in practical detection applications.

Method used

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  • A dual-response fluorescent sensor based on polyethyleneimine functionalized carbon quantum dots and cdtes quantum dots and its preparation method
  • A dual-response fluorescent sensor based on polyethyleneimine functionalized carbon quantum dots and cdtes quantum dots and its preparation method
  • A dual-response fluorescent sensor based on polyethyleneimine functionalized carbon quantum dots and cdtes quantum dots and its preparation method

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preparation example Construction

[0030] The invention provides a method for preparing a dual-response fluorescent sensor based on polyethyleneimine functionalized carbon quantum dots and CdTeS quantum dots, comprising the following steps:

[0031] Mixing the cadmium source, the organic ligand containing a mercapto functional group and water, adjusting the pH value of the system to 9-11, and injecting argon gas to obtain a cadmium source solution;

[0032] Injecting the tellurium precursor solution and the sulfur source into the cadmium source solution to obtain a mixed solution;

[0033] The mixed solution is subjected to a first hydrothermal reaction to obtain a ternary CdTeS quantum dot aqueous solution;

[0034] mixing polyethyleneimine, carbon source and water, and performing a second hydrothermal reaction to obtain a polyethyleneimine functionalized carbon quantum dot solution;

[0035] The ternary CdTeS quantum dot solution is mixed with the polyethyleneimine functionalized carbon quantum dot solution ...

Embodiment 1

[0055] Step 1: Dissolve cadmium chloride in deionized water, then add mercaptoacetic acid and stir until uniform, then adjust the pH value of the system to 9, and then pass in argon to remove the air in the mixed solution.

[0056] Step 2: Rapidly inject the tellurium precursor solution and thiourea in the ratio of 0.15:0.75 into the mixed solution obtained in Step 1 in sequence. The obtained mixed solution was transferred to a polyethylene autoclave, reacted at 180° C. for 40 minutes, and cooled naturally to room temperature to obtain a ternary CdTeS quantum dot aqueous solution.

[0057] Step 3: dissolving polyethyleneimine and carbon source in deionized water, and reacting at 200° C. for 6 hours. Then, the obtained substance was dialyzed in deionized water for 15 hours to obtain a polyethylenimine functionalized carbon quantum dot solution, and the carbon sources were citric acid, glucose, glycine and sucrose respectively.

[0058] Step 4: Mix the ternary CdTeS quantum dot...

Embodiment 2

[0062] Step 1: Dissolving cadmium chloride in deionized water, then adding mercaptoacetic acid and stirring until uniform, then adjusting the pH value of the system to 10, and then introducing argon gas to remove the air in the mixed solution.

[0063] Step 2: Rapidly inject the tellurium precursor solution and thiourea in the ratio of 0.15:0.75 into the mixed solution obtained in Step 1 in sequence. The obtained mixed solution was transferred to a polyethylene autoclave, reacted at 180° C. for 40 minutes, and cooled naturally to room temperature to obtain a ternary CdTeS quantum dot aqueous solution.

[0064] Step 3: dissolving polyethyleneimine and citric acid in deionized water, and reacting at 200° C. for 6 hours. Then, the obtained substance was dialyzed in deionized water for 20 h to obtain a polyethyleneimine functionalized carbon quantum dot solution.

[0065] Step 4: Mix the ternary CdTeS quantum dot solution obtained in step 2 with the polyethyleneimine functionaliz...

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Abstract

The invention provides a dual-response fluorescence sensor based on polyethyleneimine functionalized carbon quantum dots and CdTeS quantum dots and a preparation method thereof, and belongs to the technical field of fluorescence sensor preparation. The unique features of the present invention are: (1) This method adopts a two-step method to obtain negatively charged water-soluble ternary CdTeS quantum dots, and realizes continuous adjustment of its emission spectrum by adjusting the molar ratio of tellurium and sulfide ions. And the fluorescence emission can reach the near-infrared region. (2) Use a one-step hydrothermal method to obtain polyethylenimine-functionalized carbon quantum dots. Preparation and modification are performed simultaneously to obtain carbon quantum dots with positive charges (amino functional groups) on the surface. (3) The two can be effectively combined through static force to produce two fluorescence emission peaks with different wavelengths at the same excitation wavelength.

Description

technical field [0001] The invention relates to the technical field of fluorescence sensor preparation, in particular to a double-response fluorescence sensor based on polyethyleneimine functionalized carbon quantum dots and CdTeS quantum dots and a preparation method thereof. Background technique [0002] Fluorescence sensing technology has been considered as a promising sensing method for bioanalysis due to its advantages of simple operation, low cost, and high sensitivity. At present, there are two main types of fluorescent materials used in fluorescent sensors, one is traditional organic fluorescent dyes, and the other is inorganic nanomaterials, such as silica nanoparticles, noble metal nanoclusters, graphene quantum dots, and carbon quantum dots. dots and semiconductor quantum dots, etc. Among many materials, quantum dots have made considerable research progress in the field of biosensing due to their unique optical properties, long fluorescence lifetime, strong photo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/65C09K11/88
CPCC09K11/025C09K11/65C09K11/883
Inventor 樊君杨敏刘恩周郝红闫钰佳米国花胡晓云
Owner NORTHWEST UNIV
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