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Carbon nano point with high fluorescence quantum efficiency and preparation method thereof

A fluorescent quantum and carbon nanodot technology, applied in nanocarbon, nanotechnology, nanooptics and other directions, can solve the problems of low fluorescent quantum efficiency of carbon nanodots, poor water solubility, time-consuming and labor-intensive, etc. The effect of production, broadening the scope of application and low cost

Inactive Publication Date: 2013-11-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of high cost, complicated operation, time-consuming and labor-consuming preparation method of carbon nano-dots in the prior art, low fluorescent quantum efficiency and poor water solubility of the prepared carbon nano-dots, and to provide a high-efficiency Fluorescence quantum efficiency carbon nano-dot and preparation method thereof

Method used

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  • Carbon nano point with high fluorescence quantum efficiency and preparation method thereof
  • Carbon nano point with high fluorescence quantum efficiency and preparation method thereof
  • Carbon nano point with high fluorescence quantum efficiency and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Put 2.1 g of oxalic acid and 2.5 g of diethylene triamine into a round bottom flask, mix well to obtain a mixture;

[0041] (2) Heat the mixture at 170°C for 16 hours to obtain a crude product;

[0042] (3) After the crude product is naturally cooled to room temperature, acetone is added, precipitated, washed, the resulting precipitate is separated by a centrifuge, and the precipitate is placed in a dialysis bag (molecular weight cut-off: 3.0KDa), and dialyzed with water for two days , Change the water every 6h to remove small molecules;

[0043] (4) Freeze-dry the solution in the dialysis bag to obtain a yellow-brown solid, that is, carbon nanodots.

[0044] The prepared carbon nano-dots are solid, which is easy to store, and has very good solubility in water. The aqueous solution of carbon nano-dots is very stable and stored at room temperature for one year without precipitation or aggregation.

Embodiment 2

[0046] (1) Add 1.8 g of glycine and 7.5 g of diethylenetriamine into a round bottom flask, mix well to obtain a mixture;

[0047] (2) Heat the mixture at 175°C for 10 hours to obtain a crude product;

[0048] (3) After the crude product is naturally cooled to room temperature, acetone is added, precipitated, washed, the resulting precipitate is separated by a centrifuge, and the precipitate is placed in a dialysis bag (molecular weight cut-off: 3.0KDa), and dialyzed with water for two days , Change the water every 6h to remove small molecules;

[0049] (4) Freeze-dry the solution in the dialysis bag to obtain a yellow-brown solid, which is a carbon nanodot.

[0050] The prepared carbon nanodots are solid, which is convenient for storage, and has very good solubility in water. The aqueous solution of carbon nanodots is very stable and stored at room temperature for one year without precipitation and aggregation.

Embodiment 3

[0052] Combine figure 1 Illustrative Example 3

[0053] (1) Put 2.1g of citric acid and 4.5g of diethylenetriamine into a round bottom flask, mix well to obtain a mixture;

[0054] (2) Heat the mixture at 165°C for 6 hours to obtain a crude product;

[0055] (3) After the crude product is naturally cooled to room temperature, acetone is added, precipitated, washed, the resulting precipitate is separated by a centrifuge, and the precipitate is placed in a dialysis bag (molecular weight cut-off: 3.0KDa), and dialyzed with water for two days , Change the water every 6h to remove small molecules;

[0056] (4) Freeze-dry the solution in the dialysis bag to obtain a yellow-brown solid, which is a carbon nanodot.

[0057] The carbon nanodots of Example 3 are dissolved in water, and they are colorless and transparent under natural light irradiation. After irradiation with 365nm light, such as figure 1 As shown, the carbon nanodots are blue in the aqueous solution, indicating that the carbon na...

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Abstract

The invention discloses a carbon nano point with the high fluorescence quantum efficiency and a preparation method thereof, belongs to the field of nano material science, and solves the technical problems in the prior art of high cost, operation complication, and time and labor consumption in the preparation method of the carbon nano point, and low fluorescence quantum efficiency and poor water solubility of the prepared carbon nano point. The carbon nano point disclosed by the invention takes a polycarboxylic acid or polyhydroxy compound as a carbon source, or amino acid as the carbon source, and diethylenetriamine as a surface for passivating and modifying; the carbon nano point can be prepared by using the processes of low-temperature pyrolyzation, precipitating and washing, dialysis and separation, and freezing and drying. The carbon nano point disclosed by the invention is simple in preparation method, and low in cost and and the large-scale production is convenient to carry out; the prepared carbon nano point is in a solid state, convenient to store, good in water solubility, high in fluorescence quantum efficiency (88.6%), stable in fluorescent property, wide and adjustable in range of emission wavelength, good in biocompatibility, and low in toxicity, and contains a large quanity of functional groups, so that the further derivation is facilitated; the application range of the carbon nano point in the fields of organisms, medicine and the like can be broadened.

Description

Technical field [0001] The invention relates to a carbon nano dot with high fluorescence quantum efficiency and a preparation method thereof, belonging to the field of nano material science. Background technique [0002] Carbon nanodots have good optical stability and water solubility, and are both good electron acceptors and good electron donors. Compared with semiconductor quantum dots, the surface of carbon nanodots has abundant oxygen-containing groups, is easy to be functionalized, and has low toxicity. It has a wide and continuous excitation spectrum and can realize single-element excitation and multiple emission. Therefore, it is an ideal substitute for semiconductor quantum dots. , Can be used for fluorescent labeling in the field of biomedicine. In addition, carbon nanodots have broad application prospects in the fields of ion detection, photoreduction of metals, and photocatalytic degradation of organic dyes. [0003] In order to enhance the fluorescence performance of ...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B31/02B82Y20/00B82Y40/00C01B32/15
Inventor 郑敏孙再成
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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