A Safe and Simple Method for Double-doped Nitrogen and Phosphorus Carbon Quantum Dots

A dual-doping and quantum dot technology, applied in chemical instruments and methods, measuring devices, fluorescence/phosphorescence, etc., can solve the problems of high toxicity of nitrogen doping agents, cumbersome preparation of carbon quantum dots, poor fluorescence performance, etc., and achieve solubility Good, Reaction Safe, Avoid Effects of Reaction Conditions

Active Publication Date: 2020-08-18
SOUTH CHINA UNIV OF TECH
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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

Method used

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  • A Safe and Simple Method for Double-doped Nitrogen and Phosphorus Carbon Quantum Dots
  • A Safe and Simple Method for Double-doped Nitrogen and Phosphorus Carbon Quantum Dots
  • A Safe and Simple Method for Double-doped Nitrogen and Phosphorus Carbon Quantum Dots

Examples

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Effect test

Embodiment 1

[0035] Preparation of tryptophan-carbon dots:

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

[0037] The beaker was placed in an ultrasonic machine for ultrasonic treatment 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 bottom flask, heated to reflux in a constant temperature heating magnetic stirrer, the temperature was maintained 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 became purple. After heating, cool to room temperature. After appropriate dilution, the carbon dots are red under sunlight and orange-red fluorescence under 365nm ultraviolet ...

Embodiment 2

[0046] Preparation of glutamate-carbon dots:

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

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

[0049] The solution was transferred to a 25ml round bottom flask, heated to reflux in a constant temperature heating magnetic stirrer, the temperature was maintained 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. After dilution, the obtained high-concentration carbon dots are light yellow in sunlight, and emit yellow light under 365nm ultraviolet light.

[0050] Centrifuge at 20,000rmp for 10min to remove large pa...

Embodiment 3

[0052] Preparation of aspartic acid-carbon dots:

[0053] Weigh 0.005mol of aspartic acid and 0.005mol of citric acid monohydrate into a beaker, add 5ml of deionized water, add 5ml of 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 ultrasonic treatment 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 bottom flask, heated to reflux in a constant temperature heating magnetic stirrer, the temperature was maintained 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 turned into dark brown. After heating, cool to room temperature. After appropriate dilution, the carbon dots are brown in sunlight and blue in 365nm ul...

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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 nanometer material science. Background technique [0002] Carbon quantum dots, also known as carbon dots, refer to quasi-spherical carbon nanoparticles with a particle size generally within 10nm. They were accidentally prepared by Xu in 2004 when preparing single-walled carbon nanotubes by arc discharge (J.Am.Chem.Soc .2004,126,12736–12737), and was found by Sun in 2006 to have high fluorescence quantum efficiency (J.Am.Chem.Soc.2006,128,7756–7757), thus gradually gaining people’s attention. Compared with traditional organic dyes or quantum dots, carbon dots have low cytotoxicity, good biocompatibility, simple preparation method, good physical and optical properties, and have achieved great results in bioimaging, photocatalysis, biomedicine and other fields. Concer...

Claims

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Application Information

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Patent Type & Authority Patents(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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