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Nitrogen-doped high-quantum yield fluorescent carbon dots and preparation method and application thereof

A fluorescent carbon dots, high quantum technology, applied in fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve the problem of low fluorescence quantum yield of carbon dots, and achieve easy promotion, mild and controllable reaction conditions, synthesis Simple and effective method

Active Publication Date: 2017-11-07
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, carbon dots containing only hydroxyl and carboxyl groups have a low fluorescence quantum yield, and nitrogen doping is one of the effective methods to improve the luminous efficiency of carbon dots.

Method used

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  • Nitrogen-doped high-quantum yield fluorescent carbon dots and preparation method and application thereof
  • Nitrogen-doped high-quantum yield fluorescent carbon dots and preparation method and application thereof
  • Nitrogen-doped high-quantum yield fluorescent carbon dots and preparation method and application thereof

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Effect test

Embodiment 1

[0030] Weigh 0.5g of malic acid and 0.35g of ammonium phosphate in a polytetrafluoroethylene reactor, mix them evenly, put them in a blast drying oven, heat at 220°C for 7h, and cool down to room temperature naturally to obtain dark brown carbon dot-containing The solution was diluted with 10 mL of ultrapure water, centrifuged at 10,000 rpm / min for 5 min, filtered with a 0.22 μm filter head, and then dialyzed to obtain a purified carbon dot solution, which was finally freeze-dried by a freeze dryer to obtain a nitrogen-doped high Quantum yield fluorescent carbon dot solid powder. The measured fluorescence quantum yield of carbon dots is 20.7%.

[0031] The transmission electron micrographs of the prepared nitrogen-doped fluorescent carbon dots with high quantum yield are as follows: figure 1 shown. Depend on figure 1 It can be seen that the particle size of the carbon dots is about 5nm, and the dispersibility is good.

[0032] The X-ray diffraction pattern of the prepared ...

Embodiment 2

[0042]Weigh 0.5g of malic acid and 0.2g of ammonium phosphate in a polytetrafluoroethylene reactor and mix evenly, heat at 220°C for 7h, and cool to room temperature naturally to obtain liquid dark brown carbon dots, add 10mL of ultrapure water to dilute, and then Centrifuge at 10,000rpm / min for 5min, filter with a 0.22μm filter head, and then dialyze to obtain a purified carbon dot solution, and finally dry it with a freeze dryer to obtain a nitrogen-doped fluorescent carbon dot solid powder.

Embodiment 3

[0044] Weigh 0.5g of malic acid and 0.25g of ammonium phosphate and mix them evenly in a polytetrafluoroethylene reactor, heat at 220°C for 7h, and cool to room temperature naturally to obtain liquid dark brown carbon dots, add 10mL of ultrapure water to dilute, and then Centrifuge at 10,000rpm / min for 5min, filter with a 0.22μm filter head, and then dialyze to obtain a purified carbon dot solution, and finally dry it with a freeze dryer to obtain a nitrogen-doped fluorescent carbon dot solid powder.

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Abstract

The invention relates to nitrogen-doped high-quantum yield fluorescent carbon dots and a preparation method and application thereof. The invention adopts the technical scheme as follows: the preparation method comprises the following steps: putting malic acid and ammonium phosphate into a polytetrafluoroethylene-lined reaction kettle according to a certain ratio, heating for 4-9 hours at 180-230 DEG C, naturally cooling to room temperature to obtain a dark brown carbon dot-containing solution, then performing high-speed centrifugation, filtration and dialysis to obtain a purified carbon dot solution, and finally performing freeze drying to obtain fluorescent carbon dot solid powder. By a melting method, the malic acid is used as a carbon source, ammonium phosphate is used as a nitrogen source, and the fluorescent carbon dots are synthesized by one step. By the preparation method, carbon dot preparing raw materials are easy to obtain, the method is simple, the yield is high, the synthesis conditions are mild and controllable, and the prepared carbon dots are high in water solubility, high in stability and high in fluorescence quantum yield and emit bright blue fluorescence under the irradiation of ultraviolet light.

Description

technical field [0001] The invention relates to the technical field of carbon nanomaterials. In particular, it relates to a nitrogen-doped fluorescent carbon dot with high quantum yield that emits blue light under the irradiation of an ultraviolet lamp, a preparation method and application thereof. Background technique [0002] Carbon dots (Carbon Dots) is a new type of fluorescent nanoparticles with a diameter of less than 10nm. Fluorescent carbon dots have good luminescence properties such as tunable excitation wavelength and emission wavelength, stable fluorescence performance, and photobleaching resistance. At the same time, the particle size and molecular weight of the carbon dots are small, and the biocompatibility is good. Carbon dots can enter cells through endocytosis without affecting the nucleus, and can also interact with DNA biomacromolecules to identify and detect DNA. Therefore, carbon dots can be used in cell imaging and biomarkers. In addition, fluorescen...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64C02F1/30C02F101/38
CPCC02F1/30C02F2101/38C02F2305/10C09K11/65G01N21/64
Inventor 郭兴家徐丽萍张立志郝爱军姚杰王向明
Owner LIAONING UNIVERSITY
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