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Phosphorus-doped fluorescent carbon point with high fluorescent quantum yield as well as preparation method and application thereof

A technology of fluorescence quantum yield and fluorescent carbon dots, which is applied in fluorescence/phosphorescence, chemical instruments and methods, nano-optics, etc., can solve the problems of complex preparation process and low fluorescence quantum yield, and achieve simple preparation method and biophase Good capacity and good water solubility

Active Publication Date: 2016-10-12
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 point with high fluorescent quantum yield as well as preparation method and application thereof
  • Phosphorus-doped fluorescent carbon point with high fluorescent quantum yield as well as preparation method and application thereof
  • Phosphorus-doped fluorescent carbon point with high fluorescent quantum yield as well as preparation method and application thereof

Examples

Experimental program
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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 phosphorus-doped fluorescent carbon point with a high fluorescent quantum yield as well as a preparation method and application thereof. According to the technical scheme, purified carbon point solid powder is obtained by taking tannic acid and polyethylenimine (PEI), adding de-ionized water and phosphoric acid, then transferring the mixture into a hydrothermal reaction kettle, keeping the heat and reacting for 2h to 6h in a temperature range of 140 DEG C to 240 DEG C, naturally cooling at a room temprature to obtain a light brown nano carbon point crude product solution, and centrifuging, dialyzing, refining, freezing and drying. The carbon point provided by the invention can be used for cell imaging and a photodegradation treatment process of contained organic dyestuffs. The fluorescent quantum yield of the prepared fluorescent carbon point can reach 25.4 percent. After being stored in a dark place for 6 months, the carbon point still can emit bright blue fluorescent light under the illumination of a 365nm ultraviolet lamp and the carbon point has good stability at a 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 Applications(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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