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Multi-response carbon quantum dot as well as preparation method and application thereof

A carbon quantum dot, multiple response technology, applied in chemical instruments and methods, fluorescence/phosphorescence, luminescent materials, etc., can solve the problem of rare multiple response carbon dots, and achieve excellent environmental response performance, simple synthesis process, and post-processing steps. Simple and easy effects

Inactive Publication Date: 2018-03-13
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the report of this kind of multi-responsive carbon dots prepared by free radical polymerization is relatively rare.

Method used

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  • Multi-response carbon quantum dot as well as preparation method and application thereof
  • Multi-response carbon quantum dot as well as preparation method and application thereof
  • Multi-response carbon quantum dot as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a method for preparing multiple response carbon quantum dots, specifically:

[0030] (1) Add citric acid and ethylenediamine into deionized water at a molar ratio of 2:3, stir, and after the citric acid is fully dissolved, move it into a microwave reaction tank and react at 190°C for 25 minutes. After the reaction, the molecular weight cut-off is 500 The dialysis membrane is dialyzed and dried in a freeze-drying box for 72 hours to obtain citric acid carbon dots;

[0031] The citric acid carbon dots are brownish-red powders, which are stable when dissolved in an aqueous solution, and there is no precipitation after standing for a month; the citric acid carbon dots have a strong fluorescence effect, and the quantum efficiency is 78%; and the particle size distribution is uniform, Such as figure 1 As shown, it is about 5nm;

[0032] (2) Dissolve the carbon point of citric acid obtained in step (1) in deionized water, add 8 times the mass of glyc...

Embodiment 2

[0038] Compared with Example 1, the difference is only that the steps (2), (3) are specifically:

[0039] (2) Dissolve the carbon point of citric acid obtained in step (1) in deionized water, add 6 times the mass of glycidyl methacrylate after fully dissolving, and stir at 25°C for 36h. After the reaction is over, let the product stand, After the product was separated, the lower aqueous phase was removed and dried for 72 hours to obtain the GMA-CQD radical;

[0040](3) Dissolve the GMA-CQD free radical obtained in step (2) with N,N-diethylacrylamide and acrylic acid in ethanol at a mass ratio of 1:28:3, then add 10wt‰AIBN, under nitrogen atmosphere, After reacting at 60°C for 10 hours, the product was precipitated in a tetrahydrofuran / petroleum ether system, that is, multiple response carbon quantum dots.

Embodiment 3

[0042] Compared with Example 1, the difference is only that the steps (2), (3) are specifically:

[0043] (2) Dissolve the carbon point of citric acid obtained in step (1) in deionized water, add glycidyl methacrylate 10 times its mass after fully dissolving, stir at 32°C for 12 hours, and after the reaction is over, let the product stand, After the product was separated, the lower aqueous phase was removed and dried for 72 hours to obtain the GMA-CQD radical;

[0044] (3) Dissolve the GMA-CQD free radical obtained in step (2) with N,N-diethylacrylamide and acrylic acid in ethanol at a mass ratio of 5:32:7, then add 10wt‰AIBN, under nitrogen atmosphere, After reacting at 75°C for 5 hours, the product was precipitated in a tetrahydrofuran / petroleum ether system, that is, multiple response carbon quantum dots.

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Abstract

The invention relates to a preparation method of multi-response carbon quantum dots. The preparation method comprises the following steps: (1) preparing a water solution of quantum dots, putting glycidyl methacrylate into the water solution, enabling the components to react sufficiently, collecting a solid product, and drying; (2) performing a polymerization reaction on a dried product, N,N-diethyl acrylamide and acrylic acid as raw materials, performing sedimentation, and collecting a polymer, thereby obtaining the multi-response carbon quantum dots. The multi-response carbon quantum dots prepared by using the method are well applicable to environment monitoring or biomass cell identification. The preparation method provided by the invention is simple and convenient in synthesis process,simple and feasible in aftertreatment step and applicable to large-scale production.

Description

technical field [0001] The invention relates to the preparation of a multi-response carbon quantum dot, in particular to the preparation of a carbon dot-functional molecule copolymer. Background technique [0002] Carbon quantum dots are a new type of carbon nanomaterial with a size below 10nm. Carbon nanoparticles with fluorescent properties were discovered in 2004 when carbon nanotubes were separated. Ordinary carbon is a black substance, which is generally considered to have weak luminescence and weak water solubility. However, carbon quantum dots have good water solubility and bright fluorescence, and are called carbon nanolights. In the past few years, tremendous progress has been made in the synthesis, properties, and applications of CQDs. Compared with traditional semiconductor quantum dots and organic dyes, CQDs have high water solubility, strong chemical stability, easy functionalization, resistance to photobleaching, and excellent biological characteristics, good ...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/32C08F2/44C08K3/04C09K11/02C09K11/65G01N21/64
CPCC08F2/44C08F220/06C08K3/04C09K11/025C09K11/65G01N21/64C08F220/325
Inventor 岳冬梅伊钟毓狄沐昕张立群
Owner BEIJING UNIV OF CHEM TECH
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