Safe and simple method for preparing double-doped nitrogen and phosphor carbon quantum dots

A dual doping and quantum dot technology, which is applied in chemical instruments and methods, measuring devices, fluorescence/phosphorescence, etc., can solve the problems of high toxicity of nitrogen doping agents, poor fluorescence performance, cumbersome preparation of carbon quantum dots, etc., and achieve solubility Good, safe reaction, large-scale preparation effect

Active Publication Date: 2018-11-06
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0005] In order to solve the problems of cumbersome preparation of existing carbon quantum dots, poor fluorescence performance, and high toxicity of nitrogen doping agents, the present invention provides a method that uses amino acid as a nitrogen doping source, phosphoric acid as an oxidant, pretreats the raw materials by ultrasonic, and then heats them in an oil bath. Method for preparing nitrogen and phosphorus co-doped carbon dots

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  • Safe and simple method for preparing double-doped nitrogen and phosphor carbon quantum dots
  • Safe and simple method for preparing double-doped nitrogen and phosphor carbon quantum dots
  • Safe and simple method for preparing double-doped nitrogen and phosphor carbon quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Preparation of tryptophan-carbon dots:

[0036] Weigh 0.005mol tryptophan and 0.005mol glucose into a beaker, add 5ml deionized water, add 5ml 80% phosphoric acid solution by mass, stir until completely dissolved, and form a clear and transparent solution;

[0037] The beaker was placed in an ultrasonic machine for sonication for 2 h, and the ultrasonic frequency was 40 Hz. There was no change in the appearance of the solution after sonication.

[0038] The solution was transferred to a 25ml round-bottomed flask, heated to reflux in a constant temperature heating magnetic stirrer, the temperature was kept at 90 °C, and heated for 5 hours. During the heating process, the color of the solution gradually changed from clear and transparent to red, and finally to purple. After heating, cool to room temperature. After proper dilution, the carbon dots are red in sunlight, and emit orange-red fluorescence under 365nm ultraviolet light.

[0039] Centrifuge at 10000rmp for 10m...

Embodiment 2

[0046] Preparation of glutamic acid-carbon dots:

[0047] Weigh 0.0005mol glutamic acid and 0.005mol glucose into a beaker, add 5ml deionized water, then pour 5ml phosphoric acid solution with a mass fraction of 85%, stir until completely dissolved to form a clear and transparent solution;

[0048] The beaker was placed in an ultrasonic machine for sonication for 2 h, and the ultrasonic frequency was 50 kHz.

[0049] The solution was transferred to a 25ml round-bottomed flask, heated to reflux in a constant temperature heating magnetic stirrer, the temperature was kept at 150 °C, and heated for 1 hour. During the heating process, the color of the solution gradually changed from clear and transparent to brown. After heating, cool to room temperature. The obtained high-concentration carbon dots are light yellow under sunlight and yellow under 365nm ultraviolet light after dilution.

[0050] Centrifuge at 20,000 rmp for 10 min to remove large particles of impurities, and then dia...

Embodiment 3

[0052] Preparation of aspartic acid-carbon dots:

[0053] Weigh 0.005mol aspartic acid and 0.005mol citric acid monohydrate into a beaker, add 5ml deionized water, add 5ml phosphoric acid solution with a mass fraction of 90%, stir until completely dissolved, and form a clear and transparent solution;

[0054] The beaker was placed in an ultrasonic machine for sonication for 2 h, and the ultrasonic frequency was 60 kHz. There was no change in the appearance of the solution after sonication.

[0055] The solution was transferred to a 25ml round-bottomed flask, heated to reflux in a constant temperature heating magnetic stirrer, the temperature was kept at 120 °C, and heated for 2 hours. During the heating process, the color of the solution gradually changed from clear and transparent to red, and finally to black-brown. After heating, cool to room temperature. When properly diluted, the carbon dots are brown in sunlight and blue in 365nm UV light.

[0056] Centrifuge at 30000r...

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Abstract

The invention discloses a safe and simple method for preparing double-doped nitrogen and phosphor carbon quantum dots. In the method, firstly, amino acid and a carbon pre-cursor are dissolved in deionized water, a phosphoric acid solution is added, and a settled solution is prepared through stirring; then, the mixed solution is placed into an ultrasonic machine to be treated, wherein ultrasonic time is 1-2 h; the solution after ultrasonic treatment is heated for 1-5 hours in an oil bath at the temperature of 90-150 DEG C, and a nitrogen and phosphor co-doped carbon dot solution is prepared andcooled until room temperature is reached; large-particle impurities in the solution are removed through centrifuging, then dialysis is performed in a dialysis bag, and non-reaction raw materials andother small-particle impurities are removed. The raw materials are safe and free of toxin, conditions are mild, and the process is simple; by changing the type of amino acid and adjusting the ratio ofthe raw materials, the carbon quantum dots capable of emitting blue, green, yellow or orange red light can be obtained, and can be applied to the fields of bioimaging, ion detecting and others.

Description

technical field [0001] The invention relates to carbon quantum dots, in particular to a method for safely and simply preparing double-doped nitrogen and phosphorus carbon quantum dots, and belongs to the field of nanomaterial science. Background technique [0002] Carbon quantum dots, also known as carbon dots, refer to quasi-spherical carbon nanoparticles with a particle size generally within 10 nm. They were accidentally prepared by Xu in 2004 when single-walled carbon nanotubes were prepared by arc discharge (J.Am.Chem.Soc. 2004, 126, 12736–12737), and it was discovered by Sun in 2006 that it has high fluorescence quantum efficiency (J.Am.Chem.Soc.2006,128,7756–7757), which gradually gained people’s attention. Compared with traditional organic dyes or quantum dots, carbon dots have low cytotoxicity, good biocompatibility, simple preparation method, and good physical and optical properties. There are a lot of researches on it, such as as a drug carrier, gene delivery carr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/70G01N21/6486
Inventor 瞿金清蔡育铨万芳魏娇陈晓翰
Owner SOUTH CHINA UNIV OF TECH
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