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Phosphorus-doped fluorescent carbon dots with high fluorescence quantum yield and preparation method and application thereof

A fluorescence quantum yield, fluorescent carbon dot technology, applied in fluorescence/phosphorescence, chemical instruments and methods, nano-optics, etc., can solve the problems of low fluorescence quantum yield, complex preparation process, etc., and achieve good biocompatibility, Simple preparation method and good stability

Active Publication Date: 2018-06-22
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there have been a lot of reports on the preparation method of carbon dots and related application research, there are still problems such as low fluorescence quantum yield and complicated preparation process. Therefore, it is necessary to find a simple and fast method for preparing fluorescent carbon dots with good luminescent properties.

Method used

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  • Phosphorus-doped fluorescent carbon dots with high fluorescence quantum yield and preparation method and application thereof
  • Phosphorus-doped fluorescent carbon dots with high fluorescence quantum yield and preparation method and application thereof
  • Phosphorus-doped fluorescent carbon dots with high fluorescence quantum yield and preparation method and application thereof

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Effect test

Embodiment 1

[0029] Weigh 0.2g of tannic acid and 0.2g of PEI, add 10ml of deionized water, then add 0.5ml of phosphoric acid, fully stir and dissolve, transfer to a 50ml reaction kettle, put into a blast drying oven, and dry at 140 After heating at ℃ for 2h, cooling to room temperature naturally, a dark brown carbon dot solution was obtained, and then after dialysis and freeze-drying, phosphorous-doped fluorescent carbon dots (CDs) solid powder was finally obtained. The fluorescence quantum yield is 25.4%.

[0030] Transmission electron micrographs of phosphorus-doped fluorescent carbon dots figure 1 shown. It can be seen from the figure that the particle size of carbon dots is about 9nm.

[0031] The X-ray diffraction spectrum of phosphorus-doped fluorescent carbon dots is as follows: figure 2 shown. X-ray diffraction analysis shows that the carbon dot powder has an obvious and broad diffraction peak around 2θ=23°, indicating that the carbon dots exist in an amorphous form.

[0032...

Embodiment 2

[0041] Weigh 0.2g of tannic acid and 1.0g of PEI, add 15ml of deionized water, then add 1.0ml of phosphoric acid, fully stir and dissolve, transfer to a 50ml reaction kettle, put into a blast drying oven, and dry at 180 ℃ for 4 hours, and naturally cooled to room temperature to obtain a dark brown carbon dot solution, which was then dialyzed to obtain a phosphorus-doped fluorescent carbon dot solution.

Embodiment 3

[0043] Weigh 0.5g of tannic acid and 1.2g of PEI, add 20ml of deionized water, add 1.5ml of phosphoric acid, fully stir to dissolve, transfer to a 50ml reaction kettle, put it in a blast drying oven, and dry it at 200°C Heating for 4 hours, cooling down to room temperature naturally to obtain a dark brown carbon dot solution, and then dialysis to finally obtain a phosphorus-doped fluorescent carbon dot solution.

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Abstract

The invention relates to a high fluorescence quantum yield phosphorus-doped fluorescent carbon dot and its preparation method and application. The technical solution adopted is: take tannic acid and polyethylenimine (PEI), add deionized water and phosphoric acid, then transfer to a hydrothermal reaction kettle, insulate and react for 2 to 6 hours in the temperature range of 140 to 240°C. The crude solution of light brown nanocarbon dots was obtained by natural cooling at room temperature, which was refined by centrifugation, dialysis, and freeze-drying to obtain purified carbon dot solid powder. The carbon dots of the present invention can be used in cell imaging and photodegradation processes containing organic dyes. The fluorescence quantum yield of the fluorescent carbon dots prepared by the invention can reach 25.4%. After being stored in a dark place for 6 months, it still emits bright blue fluorescence under 365nm ultraviolet light, indicating that the carbon dots have good stability at room temperature.

Description

technical field [0001] The invention relates to the technical field of carbon nanomaterials, in particular to a phosphorus-doped fluorescent carbon point with blue fluorescence synthesized by using tannin and polyethyleneimine in a phosphoric acid medium and an application thereof. Background technique [0002] Carbon dots (Carbon Dots) are dispersed spherical fluorescent carbon nanoparticles with a size less than 10nm, which have excellent photoluminescent properties. Compared with traditional organic fluorescent dyes, fluorescent carbon dots have higher photostability and photobleaching resistance. In addition, fluorescent carbon dots have small molecular weight and particle size, good biocompatibility, low toxicity, wide and continuous excitation spectrum, and can realize one-way excitation and multiple emission. It is a very good fluorescent labeling and imaging reagent and has been successfully Applications in cell and in vivo imaging. Fluorescent carbon dots have som...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/70G01N21/64B01J27/188B82Y20/00B82Y40/00
CPCG01N21/6428C09K11/70B82Y20/00B82Y40/00B01J27/188B01J35/39
Inventor 郭兴家刘文静丛臣日
Owner LIAONING UNIVERSITY
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