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Multicolor luminous carbon nanodot as well as preparation method and application thereof

A technology of carbon nano-dots and carbon sources, applied in nano-carbon, nano-technology, nano-optics, etc., can solve the problems of high cost of carbon nano-dot preparation methods, red shift of emission peak position, weakening of intensity, etc., to achieve large-scale The effect of production, low cost and easy storage

Inactive Publication Date: 2013-11-20
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

[0006] The purpose of the present invention is to solve the technical problems of carbon nano-dots in the prior art that with the increase of the excitation wavelength, the emission peak position is red-shifted and the intensity is weakened, and the preparation method of carbon nano-dots is high in cost, complicated in operation, time-consuming and labor-intensive, Provided is a multicolor luminescent carbon nano-dot and its preparation method and application

Method used

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  • Multicolor luminous carbon nanodot as well as preparation method and application thereof
  • Multicolor luminous carbon nanodot as well as preparation method and application thereof
  • Multicolor luminous carbon nanodot as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Combine figure 1 Illustrative Example 1

[0060] (1) Add 3.8 g of oxalic acid and 4.46 mL of triethylenetetramine into a round bottom flask, mix well to obtain a mixture;

[0061] (2) React the mixture at 180°C for 1 hour to obtain a crude product;

[0062] (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;

[0063] (4) Freeze-dry the solution in the dialysis bag to obtain a yellow-brown solid, which is a carbon nanodot.

[0064] 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.

[0065] The carbon ...

Embodiment 2

[0067] Combine figure 1 Illustrative Example 2

[0068] (1) Add 0.92g of glycerol and 11.5g of tetraethylenepentamine into a round bottom flask, mix well to obtain a mixture;

[0069] (2) Heat the mixture at 200°C for 24 hours to obtain a crude product;

[0070] (3) After the crude product is naturally cooled to room temperature, acetone is added, precipitated, washed, the obtained 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 6 hours to remove small molecules;

[0071] (4) Freeze-dry the solution in the dialysis bag to obtain a yellow-brown solid, which is a carbon nanodot.

[0072] 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.

[0073] The carbon...

Embodiment 3

[0075] Combine figure 1 Illustrative Example 3

[0076] (1) Put 2.1 g of citric acid and 10.0 mL of polyene polyamine into a round bottom flask, mix well to obtain a mixture;

[0077] (2) Heat the mixture at 160°C for 10 hours to obtain a crude product;

[0078] (3) After the crude product is naturally cooled to room temperature, add acetone, precipitate, wash, separate the obtained precipitate by a centrifuge, and put the precipitate into a dialysis bag, dialyzed with water for two days, and change the water every 6 hours. Remove small molecules;

[0079] (4) Freeze-dry the solution in the dialysis bag to obtain a yellow-brown solid, which is a carbon nanodot.

[0080] 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.

[0081] The carbon nanodots obtained in Example 3 were analyzed by infr...

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Abstract

The invention discloses a multicolor luminous carbon nanodot as well as a preparation method and an application thereof, belonging to the field of nanomaterial science and solving the technical problems that the emitted light peak position of a carbon nanodot generates red shift and the strength is weakened with increase of wavelength of excited light and a preparation method of the carbon nanodot is high in cost, complex to operate, time-consuming and labor-consuming in the prior art. According to the preparation method, with a polycarboxylic or polyhydric organic compound or an amino acid as a carbon source and long-chained organic diamine as a surface passivation modifier, the multicolor luminous carbon nanodot is prepared by the steps of low-temperature pyrolysis, precipitation washing, dialysis separation and freeze drying. The preparation method of the multicolor luminous carbon nanodot is simple, low in cost and can be conveniently put into large-scale production; the prepared carbon nanodot is at a solid state, is convenient to store, has high fluorescence quantum efficiency and good biocompatibility, can respectively emit strong green light, orange light and red light under the excitation of blue light, green light and yellow light, and can be used as a bioluminescence probe and an optical imaging marker.

Description

Technical field [0001] The invention relates to a multi-color luminous carbon nano dot, a preparation method and application thereof, and belongs to the field of nano material science. Background technique [0002] Semiconductor quantum dots have wide excitation spectrum and continuous distribution, narrow and symmetrical emission spectrum, color can be adjusted by adjusting the size, high light stability, long fluorescence lifetime and many other excellent characteristics, becoming a new generation of fluorescent imaging materials. However, the existing quantum dots all contain heavy metal elements, which makes them potentially biologically toxic and not suitable for application in the biological field. [0003] Carbon nanodots are zero-dimensional carbon nanomaterials, which have many advantages of semiconductor quantum dots, such as good light stability, multicolor, and large two-photon absorption cross-section. In addition, carbon nanodots have many advantages that semiconduct...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B31/02G01N21/64B82Y20/00B82Y40/00C01B32/15
Inventor 郑敏孙再成
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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