High fluorescence quantum efficiency carbon nanodots and preparation method thereof

A carbon nanodot, quantitative ratio technology, applied in nano-carbon, nanotechnology, nano-optics and other directions, can solve the problems of low fluorescence quantum efficiency of carbon nanodots, poor water solubility, complicated operation, etc., to facilitate large-scale production, Widen the scope of application and good biocompatibility

Inactive Publication Date: 2016-03-02
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • High fluorescence quantum efficiency carbon nanodots and preparation method thereof
  • High fluorescence quantum efficiency carbon nanodots and preparation method thereof
  • High fluorescence quantum efficiency carbon nanodots and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) 2.1g oxalic acid and 2.5g diethylenetriamine are added into a round bottom flask, fully mixed to obtain a mixture;

[0041] (2) The mixture was heated at 170° C. for 16 h to obtain a crude product;

[0042] (3) After cooling the crude product to room temperature naturally, add acetone, precipitate, wash, separate the obtained precipitate through a centrifuge, put the precipitate into a dialysis bag (molecular weight cut-off: 3.0KDa), and dialyze with water for two days , change the water every 6 hours to remove small molecules;

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

[0044] The prepared carbon nano-dots are solid, easy to store, and have very good solubility in water. The aqueous solution of carbon nano-dots is very stable, and no precipitation and aggregation will occur when stored at room temperature for one year.

Embodiment 2

[0046] (1) 1.8g glycine and 7.5g diethylenetriamine are added in a round bottom flask, fully mixed to obtain a mixture;

[0047] (2) The mixture was heated at 175° C. for 10 h to obtain a crude product;

[0048](3) After cooling the crude product to room temperature naturally, add acetone, precipitate, wash, separate the obtained precipitate through a centrifuge, put the precipitate into a dialysis bag (molecular weight cut-off: 3.0KDa), and dialyze with water for two days , change the water every 6 hours to remove small molecules;

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

[0050] The prepared carbon nano-dots are solid, easy to store, and have very good solubility in water. The aqueous solution of carbon nano-dots is very stable, and no precipitation and aggregation will occur when stored at room temperature for one year.

Embodiment 3

[0052] to combine figure 1 Illustrative Example 3

[0053] (1) 2.1g of citric acid and 4.5g of diethylenetriamine are added to a round bottom flask, fully mixed to obtain a mixture;

[0054] (2) The mixture was heated at 165° C. for 6 h to obtain a crude product;

[0055] (3) After cooling the crude product to room temperature naturally, add acetone, precipitate, wash, separate the obtained precipitate through a centrifuge, put the precipitate into a dialysis bag (molecular weight cut-off: 3.0KDa), and dialyze with water for two days , change the water every 6 hours to remove small molecules;

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

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

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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 not only good electron acceptors, but also good electron donors. Compared with semiconductor quantum dots, the surface of carbon nanodots is rich in oxygen-containing groups, easy to functionalize, and has low toxicity. It has a wide and continuous excitation spectrum, which can realize single excitation and multiple emission, so 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 fluorescent properties of carbon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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